Ford Explorer Quiz
Powertrain

Diagnosis and Testing - External Controls

In this manual: Powertrain
General Information — 41Chassis — 173Powertrain — 250Electrical — 303Body and Paint — 331
~55min read

Diagnostic Trouble Code (DTC) Chart

The diagnosis in this manual assumes a certain level of skill and knowledge of Ford-approved diagnostic procedures.
REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).


Diagnostic Trouble Code Chart


Module Trouble Code Description Action
GSM P0562:00 System Low Voltage: No Sub-type Information GO to Pinpoint Test B
GSM P0563:00 System High Voltage: No Sub-type Information GO to Pinpoint Test C
GSM P0605:00 Internal Control Module Read Only Memory (ROM) Error: No Sub-type Information GO to Pinpoint Test M
GSM P0606:00 Control Module Processor: No Sub-type Information GO to Pinpoint Test M
GSM P0607:00 Control Module Performance: No Sub-type Information GO to Pinpoint Test M
GSM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub-type Information GO to Pinpoint Test M
GSM P07EC:00 Multifunction Transmission Range Selection Circuit: No Sub-type Information GO to Pinpoint Test K
GSM P07ED:00 Multifunction Transmission Range Selection Circuit Stuck: No Sub-type Information GO to Pinpoint Test K
GSM P0814:00 Transmission Range Indicator Circuit: No Sub-type Information GO to Pinpoint Test J
GSM P0915:00 Shift Position Circuit "A" Range/Performance: No Sub-type Information GO to Pinpoint Test J
GSM P0919:00 Shift Position Control Error: no subtype information GO to Pinpoint Test H
GSM P0929:00 Shift Interlock/Actuator Solenoid Circuit "A" Range/Performance: no subtype information GO to Pinpoint Test H
GSM P164E:00 Transmission Range Select Internal Control Module Performance: No Sub-type Information GO to Pinpoint Test M
GSM P166B:00 Driver Door Status Correlation: No Sub-type Information GO to Pinpoint Test I
GSM P1753:00 Shift Position Sensor Alignment: No Sub-type Information GO to Pinpoint Test H
GSM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information GO to Pinpoint Test G
GSM U0100:87 Lost Communication With ECM/PCM "A": No Sub Type Information GO to Pinpoint Test G
GSM U0121:00 Communication Lost with Anti-Lock Brake System (ABS) Control Module "A": no subtype information GO to Pinpoint Test F
GSM U0140:00 Lost Communication With Body Control Module: No Sub Type Information GO to Pinpoint Test E
GSM U0155:00 Lost Communication with Instrument Panel Cluster (IPC) Control Module: No Sub Type Information GO to Pinpoint Test D
GSM U0301:00 Software Incompatibility with ECM/PCM: No Sub-Types Available GO to Pinpoint Test N
GSM U0401:00 Incorrect Data Received from ECM/PCM 'A': No Sub Type Information GO to Pinpoint Test G
GSM U0422:00 Incorrect Data Received from Body Control Module: No Sub Type Information GO to Pinpoint Test E
GSM U1011:00 Incorrect Internal Control Module Monitor Data Received from ECM/PCM: No Sub-type Information GO to Pinpoint Test G
GSM U101F:00 Incorrect Monitoring of Internal Control Module Data Received from Transmission Range Module: No Sub-Type Information GO to Pinpoint Test G

Symptom Chart - External Controls

In most cases, the GSM will set a DTC to assist with diagnosis. Refer to the DTC Chart before using the Symptom Chart.


Symptom Chart - External Controls


Condition Action
Transmission Stuck in Park GO TO Pinpoint Test O
Transmission Automatically Returns to Park GO to Pinpoint Test P
Transmission Does Not Return to Park When Door Is Opened GO to Pinpoint Test Q
Park Does Not Engage GO TO Pinpoint Test R
Paddle Shifters Operate Incorrectly GO to Pinpoint Test S
Progressive Range Selection Operates Incorrectly GO to Pinpoint Test A

Pinpoint Tests


DIAGNOSTIC TEST A: PRNDM SHIFT SELECTOR OPERATES INCORRECTLY

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

Progressive Range Selection allows the driver to disable one or more upshifts, if required by driving conditions. This feature uses the (+) and (-) switches in conjunction with the SelectShift™ system. When the rotary shift knob is in the (D) position, the vehicle is not moving, and the (-) switch is pressed, the Progressive Range Selection feature becomes active and the IPC displays all available gear positions up to 10th gear. Each additional press of the (-) switch will progressively lock out gears, starting with 10th gear. Locked-out gears are no longer displayed on the IPC. Pressing the (+) switch progressively unlocks gears that were previously locked out. Pressing the (+) switch when all gears are active deactivates the Progressive Range Selection feature.

Possible Sources

  • Open or Shorted Circuit
  • Paddle Shifters
  • PCM
A1 CHECK THE COMMUNICATION NETWORK
  • The ignition is on.
  • Using the diagnostic scan tool, perform the network test.

Do the PCM and IPC pass the network test?
Yes GO to A2
No If the module does not respond to the scan tool for diagnosis,
REFER to: Communication Network (418-00 Communication Network, Diagnosis and Testing).
A2 CHECK THE SELECTSHIFT™ SYSTEM
  • The ignition is on.
  • USE the SelectShift™ system and shift the transmission up and down.

Does the SelectShift™ system operate correctly?
Yes RESOLVE any network and non-network DTCs in the PCM and IPC.
No GO to Pinpoint Test L
DIAGNOSTIC TEST B: DTC P0562

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

The GSM requires an operating voltage of 9 to 16 volts. The GSM receives this voltage from the BCM and has 2 ground circuits. Excessive resistance in one or more of these circuits, a discharged battery, or a faulty charging system will cause the GSM to set a DTC.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0562:00 System Low Voltage: No Sub-type Information This DTC is stored in continuous memory if the voltage supplied to the GSM drops below 9 volts.

Possible Sources

  • Battery
  • Fuses
  • Wiring, Terminals or Connectors
  • GSM
B1 RECHECK THE GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, clear the GSM DTCs.
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P0562 still present?
Yes GO to B2
No The system is currently operating correctly. The DTC may have been set due to a previous low battery voltage condition.
B2 CHECK THE CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS) IN THE PCM (POWERTRAIN CONTROL MODULE)
  • Using a diagnostic scan tool, retrieve all CMDTCs.

Are any charging system Diagnostic Trouble Codes (DTCs) present in the PCM?
Yes CHECK the vehicle charging concern.
REFER to: External Controls (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).
No GO to B3
B3 CHECK THE BATTERY CONDITION AND CHARGING STATUS
  • Perform the battery condition test.
    REFER to: External Controls (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).

Did the battery pass the condition check?
Yes GO to B4
No INSTALL a new battery.
B4 CHECK THE GSM (GEAR SHIFT MODULE) VOLTAGE
  • Ignition OFF.
  • Disconnect the GSM C3590.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-1 Ground

Is the voltage within 1 volt of the recorded battery voltage?
Yes GO to B5
No CHECK that the BCM fuse 12 (7.5A) is OK.
If OK, REPAIR the faulty circuit for high resistance or an open.
If not OK, REFER to the Wiring Diagrams manual to determine the cause of the short circuit.
B5 CHECK THE GSM (GEAR SHIFT MODULE) GROUND CIRCUIT FOR AN OPEN
  • NOTE: CHECK ground eyelet G214 and make sure it is clean and tight. Action:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-18 Ground
    C3590-9 Ground

Is the resistance less than 3 ohms?
Yes GO to B6
No REPAIR the circuit.
B6 CHECK ALL ELECTRICAL CONNECTIONS
  • Ignition OFF.
  • Disconnect and inspect the GSM C3590 and related in-line electrical connectors.
  • Using a good light source, inspect all disconnected electrical connectors for the following:
    • corrosion - install a new connector or terminal and clean the module contacts
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
    • spread terminals - install new terminals as necessary

Are there no signs of corrosion, damaged terminals, bent terminals, pushed-out terminals or stretched terminals in the connectors?
Yes GO to B7
No REPAIR the connector and terminals as necessary.
B7 VERIFY GSM (GEAR SHIFT MODULE) OPERATION
  • Connect the GSM C3590 and all related in-line electrical connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK in OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article applies to this concern, STOP this test and FOLLOW the service article instructions. If no service articles apply to this concern, INSTALL a new GSM.
REFER to: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
DIAGNOSTIC TEST C: DTC P0563

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

The GSM requires an operating voltage of 9 to 16 volts. The GSM receives this voltage from the BCM and has 2 ground circuits. Excessive resistance or an open in one or more of these circuits, a discharged battery, or a faulty charging system causes the GSM to set a DTC. This DTC may also be set in the GSM module due to battery charging or jump-starting the vehicle.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0563:00 System High Voltage: No Sub-type Information This DTC is stored in permanent memory if the voltage supplied to the GSM module exceeds 16 volts. This DTC may be set due to battery charging or jump-starting the vehicle.

Possible Sources

  • Charging System Concern
  • Wiring, Terminals or Connectors
  • GSM
C1 CHECK FOR HIGH VOLTAGE DTCS IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve all CMDTCs.

Are any charging system Diagnostic Trouble Codes (DTCs) present in the PCM?
Yes CHECK the vehicle charging concern.
REFER to: External Controls (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).
No GO to C2
C2 CHECK THE BATTERY VOLTAGE
  • Turn off all interior lights, exterior lights and accessories.
  • NOTE: Do not allow engine speed to exceed 2000 RPM during this step, otherwise the generator may self-excite, causing the charging system output voltage to default. If engine speed exceeds 2000 RPM, turn the engine off and restart it before performing this step. Start the engine and run it at approximately 1500 RPM for 3 minutes while monitoring the battery voltage.

Is the battery voltage between 11 and 15.2 volts?
Yes GO to C3
No CHECK the charging condition.
REFER TO: External Controls (307-05A External Controls Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).
C3 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) P0563
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, clear the GSM DTCs.
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P0563 still present?
Yes GO TO C4
No The system is currently operating normally. The DTC may have been set previously during a battery charge or jump-start event.
C4 CHECK ALL WIRING CONNECTIONS
  • Ignition OFF.
  • Disconnect and inspect the GSM C482A and the associated in-line electrical connectors.
  • Using a good light source, inspect all disconnected electrical connectors for the following:
    • corrosion - install a new connector or terminal and clean the module contacts
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
    • spread terminals - install new terminals as necessary

Are there no signs of corrosion, damaged terminals, bent terminals, pushed-out terminals or stretched terminals in the connectors?
Yes CHECK OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article exists for this concern, STOP this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A External Controls Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No REPAIR as necessary.
DIAGNOSTIC TEST D: DTC U0155

For circuit and connector information, refer to Wiring Diagrams Cell 14.

Normal Operation and Fault Symptoms

The IPC, GSM and BCM use the information contained in the HS-CAN messages.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0155:00 Lost Communication with Instrument Panel Cluster (IPC) Control Module: No Sub Type Information The IPC, GSM and BCM use the information contained in the HS-CAN messages. When the GSM does not receive these messages for more than 5 seconds, it sets this DTC.

Possible Sources

  • Damaged connectors or pushed-out terminals, open circuit, short to power or ground
  • BCM
  • PCM
D1 CHECK THE COMMUNICATION NETWORK
  • The ignition is on.
  • NOTE: If performing a GSM self-test, make sure the driver door is closed and locked. Using the diagnostic scan tool, perform the network test.

Does the IPC pass the network test?
Yes GO to D2
No If the module does not respond to the scan tool for diagnosis,
REFER to: Communication Network (418-00 Communication Network, Diagnosis and Testing).
D2 GSM (GEAR SHIFT MODULE) SELF-TEST DIAGNOSTIC TROUBLE CODES (DTCS)
  • Clear all DTCs.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC U0155 present?
Yes GO to D3
No The system is currently operating correctly. The DTC may have been set due to high network traffic or an intermittent condition.
D3 RETRIEVE STORED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE GSM (GEAR SHIFT MODULE) SELF-TEST
  • Check the DTCs using the self-test.

Are GSM DTCs present?
Yes REFER TO the GSM DTC and diagnose these DTCs first.
No GO to D4
D4 RETRIEVE STORED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
  • Check the DTCs using the self-test.

Is DTC U3000:49 present?
Yes
REFER TO: Instrument Cluster, Message Center and Warning Chimes (413-01 Instrument Cluster, Message Center and Warning Chimes, Diagnosis and Testing).
No GO to D5
D5 CHECK DTC U0155 SET IN OTHER MODULES
  • Using the diagnostic scan tool, perform a self-test of all modules.
  • Retrieve the DTCs from all modules.

Is DTC U0155 present in the PCM or SCCM?
Yes CHECK OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article exists for this concern, STOP this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new IPC.
Click here to access the guided procedure (IPC). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No The system is currently operating correctly.
DIAGNOSTIC TEST E: DTC U0140, U0422

For circuit and connector information, refer to Wiring Diagrams Cell 14.

Normal Operation and Fault Symptoms

The IPC, GSM and BCM use the information contained in the HS-CAN messages.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0140:00 Lost Communication With Body Control Module: No Sub Type Information This DTC sets if the GSM detects no data messages received from the BCM.
GSM U0422:00 Incorrect Data Received from Body Control Module: No Sub Type Information This DTC sets if the GSM detects invalid data from the BCM.

Possible Sources

  • Communication Problem
  • GSM
  • BCM
E1 CHECK THE SCAN TOOL COMMUNICATION WITH THE BCM (BODY CONTROL MODULE)
  • Connect the diagnostic scan tool.
  • Verify that a vehicle session can be established using the scan tool.

Can a vehicle communication session be established?
Yes GO to E2
No To diagnose a BCM that does not communicate with the scan tool,
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).
E2 CHECK THE GSM (GEAR SHIFT MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • Using the diagnostic scan tool, perform a GSM self-test.

Are there any non-network diagnostic trouble codes (DTCs) present?
Yes First RESOLVE any non-network diagnostic trouble codes (DTCs). REFER TO the GSM DTC Chart.
No GO to E3
E3 CHECK THE BCM (BODY CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a scan tool, perform the BCM self-test.

Are there any non-network diagnostic trouble codes (DTCs) present?
Yes First RESOLVE any non-network diagnostic trouble codes (DTCs).
REFER TO: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).
No GO to E4
E4 CHECK THE GWM (GATEWAY MODULE A) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform the GWM self-test.

Are any diagnostic trouble codes (DTCs) present?
Yes
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).
No GO to E5
E5 RECHECK THE GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, clear the GSM diagnostic trouble codes (DTCs).
  • Road test the vehicle.
  • Using the diagnostic scan tool, perform a GSM self-test.

Are DTC U0140 and/or U0422 still present?
Yes GO to E6
No The system is currently operating correctly. The DTC may have been set due to high network traffic or an intermittent condition.
E6 CHECK THE DTC U0140, U0422 SET IN OTHER MODULES
  • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs).

Are DTCs U0140 and/or U0422 present in other modules?
Yes GO to E7
No GO to E9
E7 CHECK OTHER CAUSES OF COMMUNICATION NETWORK PROBLEMS
  • CHECK the vehicle service history for recent service actions involving the BCM or GSM. If recent service history is found:
    • make sure the correct replacement module was installed
      • The HVBOM can be used to verify correct part application.
    • make sure the replacement module configuration was correct
      • reconfigure the module using the original data if the previous configuration is suspected
    • make sure the module was not obtained from a similar vehicle and installed on the customer's vehicle
      • Reinstall the replaced module in the original vehicle and obtain a new replacement module.
  • Operate the system and determine whether the observed symptom persists.

Is the observed symptom still present?
Yes GO to E8
No The system is currently operating correctly. The concern may have been caused by incorrect part replacement procedures or incorrect module configuration.
E8 CHECK THE BCM (BODY CONTROL MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all BCM and associated harness connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect all BCM and all associated in-line connectors. Make sure they are fully seated and locked.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article exists for this concern, STOP this test and FOLLOW the service article instructions. If no service articles address this concern,
Click here to access the guided procedure (BCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
E9 CHECK THE GSM (GEAR SHIFT MODULE) FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM C3590 and all associated in-line electrical connectors.
  • Using a good light source, inspect all disconnected electrical connectors for the following:
    • corrosion - install a new connector or terminal and clean the module contacts
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
    • spread terminals - install new terminals as necessary
  • Reconnect the GSM C3590 and all associated in-line electrical connectors. Make sure they are fully seated and locked.
  • Using the diagnostic scan tool, clear all DTCs.
  • Road test the vehicle.
  • Perform a TCM self-test.

Are DTC U0140 and/or U0422 still present?
Yes CHECK in OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article applies to this concern, STOP this test and FOLLOW the service article instructions. If no service articles apply to this concern, INSTALL a new GSM.
REFER to: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
DIAGNOSTIC TEST F: DTC U0121

For circuit and connector information, refer to Wiring Diagrams Cell 14.

Normal Operation and Fault Symptoms

The GSM and ABS module uses information contained in messages on the HS-CAN bus.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0121:00 Communication Lost with Anti-Lock Brake System (ABS) Control Module "A": no subtype information This DTC sets if the GSM detects the absence of data messages received from the ABS module.

Possible Sources

  • Communication Problem
  • ABS
  • GSM
F1 CHECK THE SCAN TOOL COMMUNICATION WITH THE ABS (ANTI-LOCK BRAKE SYSTEM)
  • Connect the diagnostic scan tool.
  • Verify that a vehicle session can be established using the scan tool.

Can a vehicle communication session be established?
Yes GO to F2
No
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).
F2 CHECK THE GSM (GEAR SHIFT MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • The ignition is on.
  • Using the diagnostic scan tool, perform a GSM self-test.
  • Clear the DTCs.
  • Wait 10 seconds.
  • Repeat the GSM self-test.

Are any non-network DTCs present?
Yes CHECK all non-network DTCs. REFER to DTC Chart: GSM.
No GO to F3
F3 PERFORM THE ABS (ANTI-LOCK BRAKE SYSTEM) SELF-TEST
  • Using the diagnostic scan tool, perform the ABS self-test.

Are any non-network DTCs present?
Yes CHECK all non-network DTCs.
REFER to: Anti-Lock Brake System (ABS) and Stability Control System (206-09 Anti-Lock Brake System (ABS) and Stability Control System, Diagnosis and Testing).
No GO to F4
F4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scanner, check the GWM continuous memory diagnostic trouble codes (CMDTCs).

Are any DTCs set?
Yes
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing).
No GO to F5
F5 RECHECK THE GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, clear the GSM DTCs.
  • Ignition OFF.
  • The ignition is on.
  • Wait 10 seconds.
  • Using a scan tool, perform a continuous memory self-test.
  • Check the GSM DTCs.

Is DTC U0121 still present?
Yes GO to F6
No The system is currently operating correctly. The DTC may have been set due to high network traffic or an intermittent condition.
F6 CHECK FOR OTHER CAUSES OF NETWORK COMMUNICATION PROBLEMS
  • CHECK the vehicle service history for recent service actions related to the ABS or AWD. If recent service history is found:
    • make sure the correct replacement module was installed
      • The HVBOM can be used to verify correct part application.
    • make sure the replacement module configuration was correct
      • reconfigure the module using the original data if the previous configuration is suspected
    • make sure the module was not obtained from a similar vehicle and installed on the customer's vehicle
      • Reinstall the replaced module in the original vehicle and obtain a new replacement module.
  • Operate the system and determine whether the observed symptom persists.

Is the observed symptom still present?
Yes GO to F7
No The system is currently operating correctly. The concern may have been caused by incorrect part replacement procedures or incorrect module configuration.
F7 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the ABS and the associated in-line connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent pins - install new terminals/pins
    • backed-out pins - install new pins as necessary
  • Reconnect the ABS and all associated in-line connectors. Make sure they are installed and fully seated.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article exists for this concern, STOP this test and FOLLOW the service article instructions. If no service articles address this concern. Click here to access the Routine guide.
Click here to access the Managed Routine (ABS). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST G: DTC U0100, U0401, U1011, U101F

For circuit and connector information, refer to Wiring Diagrams Cell 14.

Normal Operation and Fault Symptoms

The GSM and PCM use information contained in messages sent on the Transmission CAN and HS-CAN2 buses.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0100:00 Lost Communication With ECM/PCM "A": No Sub Type Information This DTC sets if the GSM does not receive some or all of the expected message from the PCM on the HS-CAN2 bus.
GSM U0100:87 Lost Communication With ECM/PCM "A": No Sub Type Information This DTC sets if the GSM does not receive some or all of the expected message from the PCM on the Transmission CAN bus.
GSM U0401:00 Incorrect Data Received from ECM/PCM 'A': No Sub Type Information This DTC sets if the GSM detects invalid data from the PCM.
GSM U1011:00 Incorrect Internal Control Module Monitor Data Received from ECM/PCM: No Sub-type Information This DTC sets if the GSM detects invalid internal control module monitor data from the PCM on the HS-CAN2 bus.
GSM U101F:00 Invalid Internal Control Module Monitor Data Received from Transmission Range Control Module: No Sub-type Information This DTC sets if the GSM detects invalid internal control module monitor data from the PCM on the CAN bus.

Possible Sources

  • Damaged connectors or pushed-out terminals, open circuit, short to power or ground
  • PCM
  • GSM
G1 CHECK THE SCAN TOOL COMMUNICATION WITH THE PCM (POWERTRAIN CONTROL MODULE)
  • Using the diagnostic scan tool, perform a PCM self-test.

Did the PCM complete the self-test?
Yes GO to G2
No If the module does not respond to the scan tool for diagnosis,
REFER to: Communication Network (418-00 Communication Network, Diagnosis and Testing).
G2 CHECK THE GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a GSM self-test.

Are there any off-network GSM diagnostic trouble codes (DTCs)?
Yes First RESOLVE any non-network diagnostic trouble codes (DTCs). REFER TO the GSM DTC Chart.
No GO to G3
G3 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST
  • Using the diagnostic scan tool, retrieve all DTCs from the PCM self-test.

Are there any non-network diagnostic trouble codes (DTCs) in the PCM?
Yes First RESOLVE all non-network DTCs. REFER to the Master DTC Chart.
No GO to G4
G4 RECHECK THE GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)
  • Clear all GSM DTCs.
  • Road test the vehicle.
  • Using the diagnostic scan tool, perform a GSM self-test.

Are DTCs U0100, U0100:87, U0401, U1011 and/or U101F still present?
Yes GO to G5
No The system is currently operating correctly. The DTC may have been set due to high network traffic or an intermittent condition.
G5 CHECK FOR DTCS U0100, U0401, U1011, U101F SET IN OTHER MODULES
  • Using the diagnostic scan tool, perform a self-test of all modules.
  • Retrieve the Diagnostic Trouble Codes (DTCs) from all modules.

Are DTCs U0100, U0401, U1011, U101F present in other modules?
Yes CHECK OASIS for any applicable service articles: TSB, GSB (General Service Bulletin), SSM (Special Service Message) or FSA (Field Service Action). If a service article exists for this concern, STOP this test and FOLLOW the service article instructions. If no service articles address this concern,
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
After installing a new PCM, PERFORM the transmission strategy download.
REFER to: Transmission Strategy Download (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, General Procedures).
No For DTC U0100:00 and/or U0401, GO to G6.
For DTC U0100:87, GO to G7.
For DTC U1011 and/or U101F, GO to G9.
G6 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect the GSM C3590.
  • Disconnect GWM C2431.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-2 C2431-17
    C3590-3 C2431-18

Is the resistance less than 3 ohms?
Yes GO to G9
No REPAIR the circuit.
G7 CHECK THE GSM (GEAR SHIFT MODULE) PRIVATE CAN (CONTROLLER AREA NETWORK) CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect the GSM C3590.
  • Disconnect the PCM C1381B for engine 2.3 L.
  • Disconnect the PCM C1551T for engine 3 L.
  • Disconnect the PCM C175T for engine 3.3 L.
  • For engine 2.3 L, measure:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-13 C1381B-65
    C3590-14 C1381B-46
  • For engine 3 L, measure:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-13 C1551T-23
    C3590-14 C1551T-8
  • For engine 3.3 L, measure:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-13 C175T-23
    C3590-14 C175T-8

Is the resistance less than 3 ohms?
Yes GO to G8
No REPAIR the circuit.
G8 CHECK THE GSM (GEAR SHIFT MODULE) PRIVATE CAN (CONTROLLER AREA NETWORK) CIRCUITS FOR A SHORT TO GROUND
  • For engine 2.3 L, measure:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-13 Ground
    C3590-14 Ground
  • For engine 3 L, measure:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-13 Ground
    C3590-14 Ground
  • For engine 3.3 L, measure:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-13 Ground
    C3590-14 Ground

Is the resistance greater than 10000 ohms?
Yes GO to G9
No REPAIR the circuit.
G9 CHECK THE GSM (GEAR SHIFT MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM C3590 and all associated in-line electrical connectors.
  • Using a good light source, inspect all disconnected electrical connectors for the following:
    • corrosion - install a new connector or terminal and clean the module contacts
    • damaged or bent pins - install new terminals or pins
    • pushed-out pins - install new pins as necessary
    • spread terminals - install new terminals as necessary
  • Reconnect the GSM C3590 and all associated in-line electrical connectors. Make sure they are fully seated and locked.
  • Using the diagnostic scan tool, clear all DTCs.
  • Perform a TCM self-test.

Are DTCs U0100, U0401, U1011 and/or U101F still present?
Yes For DTCs U0100:00 and/or U0100:87, CHECK OASIS for any applicable service articles: TSBs, GSBs (general service bulletins), SSMs (special service messages), or FSAs (field service actions). If a service article applies to this condition, STOP this test and FOLLOW the service article instructions. If no service article addresses this condition, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation). For DTCs U1011 and/or U101F, REPROGRAM the PCM using the latest software.
REFER TO: Module Programming (418-01 Module Configuration, General Procedures).
PERFORM a transmission strategy download. REFER TO: Transmission Strategy Download (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, General Procedures).
CLEAR the DTCs.
If DTC U0401, U1011 and/or U101F returns,
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint Test. After installing a new PCM, PERFORM a transmission strategy download.
REFER TO: Transmission Strategy Download (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, General Procedures).
No The system is currently operating correctly. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
DIAGNOSTIC TEST H: DTC P0919, P0929, P1753

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

The GSM controls the customer's gear selection using the rotary shift selector.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0919:00 Shift Position Control Error: no subtype information This CMDTC sets if the GSM detects that the rotary shift knob cannot return the rotary shift knob to the Park position due to an internal GSM fault.
GSM P0929:00 Shift Interlock/Actuator Solenoid Circuit "A" Range/Performance: no subtype information This CMDTC sets if the GSM detects that the rotary shift knob does not return to the Park position during the auto-rotate function due to an internal GSM fault.
GSM P1753:00 Shift Position Sensor Alignment: No Sub-type Information This CMDTC sets if the GSM detects that the rotary shift knob is not within the calibrated range.

Possible Sources

  • Inspect the rotary shift knob for obstructions that prevent it from returning to the Park position.
  • Damaged connectors or pushed-out terminals, open circuit or high resistance in the power supply wiring to the GSM, or a poor ground.
  • Discharged Battery/Charging System
  • GSM
H1 VERIFY THE BATTERY IS FULLY CHARGED
  • NOTE: If necessary, connect a battery charger to the vehicle battery to maintain battery voltage while performing this test. ENSURE the battery is fully charged before continuing with this test.
    REFER TO: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Is the battery fully charged?
Yes GO to H2
No CHARGE or INSTALL a new battery, as necessary.
REFER TO: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).
H2 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a GSM self-test.

Are any DTCs retrieved?
Yes If any system voltage or internal module diagnostic DTCs are present, RESOLVE them first. REFER TO the GSM DTC Chart.
For P0919 and/or P0929, GO to H3.
For P1753, GO to H5.
No GO to H4
H3 CHECK THE GSM (GEAR SHIFT MODULE) AUTO-ROTATE FUNCTION
  • Using a scan tool, clear all DTCs from the GSM.
  • Ignition OFF.
  • Start the engine.
  • Repeat the following steps 3 times:
    • Sit in the driver's seat with the seatbelt unbuckled and the Park selection made.
    • Select Drive.
    • Open the driver door.
    • Wait 20 seconds.
  • Using the diagnostic scan tool, perform a GSM self-test.

Does the rotary shift knob return to the Park position and no DTCs set?
Yes The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
No INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
H4 CHECK THE GSM (GEARSHIFT MODULE) FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect all GSM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect the GSM connectors. Make sure they are fully seated and locked.
  • Start the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for applicable TSBs. If a TSB applies to this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this condition, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
H5 CHECK THE GSM (GEAR SHIFT MODULE) SENSOR CALIBRATION
  • Clear the CMDTC.
  • Reprogram the GSM using the latest software.
  • Start the engine.
  • Select BACK.
  • Select NEUTRAL.
  • Select DRIVE.
  • Select PARK.
  • Make sure the GSM is firmly seated in each position.
  • Using the diagnostic scan tool, perform a GSM self-test.

Does the diagnostic trouble code return?
Yes INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly.
DIAGNOSTIC TEST I: DTC P166B

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

The PCM uses the driver door status inputs to shift the transmission into Park when the operator prepares to exit the vehicle. The PCM also uses the driver door status input to display the message "Transmission Not in Park" when the driver door is opened and the transmission is not in P mode. The message "Transmission Not in Park" may display in the cluster when the transmission is not in P mode and vehicle speed is below 2 mph, if there is a fault with the ajar switch, and DTC P166B is set in the GSM.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P166B: 00 Driver Door Status Correlation: No Sub-type Information The GSM monitors the voltage signals on the 2 door status switch inputs. If these inputs do not pass a rationality check between each other, a DTC is set.

Possible Sources

  • Damaged connectors or pushed-out terminals, open circuit, short to power or ground
  • Driver Door Ajar Sensor No. 1
  • Driver Door Ajar Sensor No. 2
  • GSM
I1 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using a scan tool, clear all DTCs from the GSM.
  • Ignition OFF.
  • The ignition is on.
  • Repeat the following steps 3 times:
    • Open the driver door.
    • Wait 10 seconds.
    • Close the driver's door.
    • Wait 10 seconds.
  • Make sure the driver door is fully closed.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P166B present?
Yes GO to I2.
No No concern at this time. The DTC may have been set by performing the GSM self-test with the door not fully closed.
I2 MONITOR THE DRIVER DOOR AJAR PIDS (PARAMETER IDENTIFICATIONS)

  • Access the GSM and monitor the DR_AJAR_HWI PID

  • Access the GSM and monitor the DR_UNLCK_HWI PID

  • Open and close the driver door several times while monitoring both Parameter Identification (PID) values.

Do both Parameter Identification (PID) values change correctly when the driver door is opened and closed?
Yes GO to I9
No GO to I3
I3 CHECK THE DOOR AJAR INDICATOR OPERATION ON THE IPC (INSTRUMENT PANEL CLUSTER)
  • Open and close the driver door while observing the door ajar indicator on the IPC.

Does the door ajar indicator on the IPC operate correctly?
Yes GO to I4
No
REFER TO: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
I4 CHECK THE DOOR STATUS CIRCUIT 1 FOR AN OPEN
  • Disconnect the GSM C3590.
  • Disconnect the driver door ajar switch C525B.
  • Inspect the connectors for damaged or pushed-out terminals.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-4 C525B-2

Is the resistance less than 3 ohms?
Yes GO to I5
No REPAIR the circuit.
I5 CHECK THE DOOR STATUS CIRCUIT 1 FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-4 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to I6
No REPAIR the circuit.
I6 CHECK THE DOOR STATUS CIRCUIT 2 FOR AN OPEN
  • Disconnect the driver door ajar switch C525A.
  • Disconnect the C2280E connector.
  • Inspect the connectors for damaged or pushed-out terminals.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-15 C525A-4

Is the resistance less than 3 ohms?
Yes GO to I7
No REPAIR the circuit.
I7 CHECK THE DOOR STATUS CIRCUIT 2 FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-15 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to I8
No REPAIR the circuit.
I8 CHECK THE DOOR STATUS CIRCUIT 1 AND DOOR STATUS CIRCUIT 2 FOR A SHORT TO VOLTAGE
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-4 Ground
    C3590-15 Ground

Is there voltage present?
Yes REPAIR the circuit.
No GO to I9
I9 CHECK THE GSM FOR A MALFUNCTION
  • Ignition OFF.
  • Disconnect the GSM C3590 and all related inline electrical connectors.
  • Using a good light source, inspect all disconnected electrical connectors for the following:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
    • spread terminals - install new terminals as necessary
  • Reconnect the GSM C3590 and all associated in-line electrical connectors. Make sure they are fully seated and locked.
  • Reconnect all other electrical connectors that were previously disconnected.
  • Start the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for applicable TSBs. If a TSB applies to this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this condition, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST J: DTC P0814, P0915

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

The GSM has two sensors that monitor the rotary knob position, and LEDs that indicate the selected range.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0814:00 Transmission Range Indicator Circuit: No Sub-type Information This CMDTC sets if the GSM detects a fault with the GSM. LED indication.
GSM P0915:00 Shift Position Circuit "A" Range/Performance: No Sub-type Information This CMDTC sets if the GSM detects a fault with one or both of the sensors that measure the rotary knob position.

Possible Sources

  • Damaged connectors or pushed-out terminals, open circuit or high resistance in the power supply wiring to the GSM, or a poor ground.
  • Discharged Battery/Charging System
  • GSM
J1 ENSURE THE BATTERY IS FULLY CHARGED
  • NOTE: If necessary, connect a battery charger to the vehicle battery to maintain battery voltage while performing this test. ENSURE the battery is fully charged before continuing with this test.
    REFER TO: External Controls (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission 10R60, Diagnosis and Testing).

Is the battery fully charged?
Yes GO to J2
No CHARGE or INSTALL a new battery, as necessary.
REFER TO: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).
J2 CHECK THE GSM CALIBRATION LEVEL
  • ENSURE the GSM calibration is at the latest level.

Is the GSM calibration at the latest level?
Yes GO to J3
No
REFER TO: Module Programming (418-01 Module Configuration, General Procedures).
J3 CHECK THE GSM POWER CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect the GSM C3590.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3590-1 Ground

Voltage is 11 volts or higher?
Yes GO to J4
No CHECK fuse 12 (7.5A). If OK, REPAIR the open circuit. If not OK, REFER to the electrical circuit diagrams to diagnose the short circuit.
J4 CHECK THE GSM GROUND FOR AN OPEN
  • Ignition OFF.
  • NOTE: CHECK ground eyelet G214 and make sure it is clean and tight. Action:
    Click to display connectors
    Positive lead Measurement/Action Negative lead
    C3590-18 Ground
    C3590-9 Ground

Is the resistance less than 3 ohms?
Yes GO to J5
No REPAIR the circuit.
J5 CHECK THE GSM (GEARSHIFT MODULE) CONTINUOUS MEMORY DTC (DIAGNOSTIC TROUBLE CODE) WITH
  • Using the diagnostic scan tool, perform a GSM self-test.
  • Clear the CMDTC.
  • Ignition OFF.
  • Wait 10 seconds.
  • Start the engine.
  • Select BACK.
  • Select NEUTRAL.
  • Select DRIVE.
  • Select PARK.
  • Repeat the GSM self-test.

Is DTC P0814 or P0915 the only DTC retrieved again?
Yes CHECK OASIS for applicable TSBs. If a TSB applies to this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this condition, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The GSM is currently operating correctly.
DIAGNOSTIC TEST K: DTC P07EC, P07ED

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

The GSM has 3 contacts under the center button. If one contact is not recognized by the GSM, a DTC is set.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P07EC:00 Multifunction Transmission Range Selection Circuit: No Sub-type Information This DTC is stored in continuous memory if one of the 3 internal contacts of the M button is faulty. The message center displays a message that this range is not available.
GSM P07ED:00 Multifunction Transmission Range Selection Circuit Stuck: No Sub-type Information DTC P07ED may be set in History if the center button is held pressed for 60 seconds or more. If DTC P07ED is stored in continuous memory, continue diagnosis. The GSM has 3 contacts under the center button. If two or more contacts report a closed circuit for 60 seconds or more, the GSM sets DTC P07ED.

Possible Sources

  • Debris or foreign material on or near the center button of the rotary gearshift knob
  • Rotary gearshift knob sticking, center button
  • Damaged connectors or pushed-out terminals, open circuit, short to power or ground
  • GSM
K1 CHECK THE GSM (GEARSHIFT MODULE) CENTER BUTTON
  • Inspect the GSM center button for debris or foreign material that could cause it to stick.
  • Press and release the center button. Make sure it moves freely.

Is the center button free of debris and foreign material, and does it move freely?
Yes GO to K2
No CLEAN any debris or foreign material from the button.
If the button still sticks after cleaning, INSTALL a new GSM.
REFER TO: Gearshift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission 10R60, Removal and Installation).
K2 CHECK THE GSM SWITCH PIDS STATUS
  • Connect the diagnostic tool.
  • The ignition is on.
  • Using a diagnostic scan tool, monitor the following PIDs:
    • SBW_SLM_SW_1
    • SBW_SLM_SW_2
    • SBW_SLM_SW_3

Do any of the switch PID values indicate that any of the gearshift M-button switches are pressed?
Yes If the gearshift M-button PID shows that one or more switch contacts are pressed, GO to K3.
No The system is currently operating normally. If the symptom is present, GO to the Symptom Chart.
K3 CHECK THE GSM (GEARSHIFT MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all GSM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect the GSM connectors. Make sure they are fully seated and locked.
  • Start the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for applicable TSBs. If a TSB applies to this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this condition, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.
DIAGNOSTIC TEST L: PADDLE SHIFTERS OPERATE INCORRECTLY

Refer to Wiring Diagrams Cell 30 for schematic and connector information.

Normal Operation and Fault Symptoms

Each steering wheel paddle switch is a momentary contact switch built into the steering wheel. When the M button on the rotary gearshift knob is pressed, the upshift/downshift function is activated, and the steering wheel paddles allow the operator to shift up and down without removing hands from the steering wheel.

Possible Sources

  • Open or Shorted Circuit
  • Steering wheel paddle switch
  • PCM
L1 CHECK THE STEERING WHEEL PADDLE SWITCH OPERATION
  • Road test the vehicle. Press the M button on the rotary gearshift knob and use the steering wheel paddles to upshift and downshift.

Do the steering wheel paddles operate correctly?
Yes The steering wheel paddles operate correctly at all times. CHECK the wiring harness connectors for loose terminals or corrosion.
No For upshift problems, GO to L2.
For downshift problems, GO to L7.
If both switches do not operate, GO to L12.
L2 CHECK THE UPSHIFT SWITCH
  • Remove the driver air bag module.
    REFER TO: Driver Air Bag (501-20B Supplemental Restraint System, Removal and Installation).
  • Shift paddle upshift switch circuit open.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    Resistor contact 1 on shift paddle switch component side. Resistor contact 2 on shift paddle switch component.

Is the resistance less than 1.5 ohms with the upshift switch pressed, and greater than 10,000 ohms when released?
Yes GO to L3
No INSTALL a new upshift paddle switch.
Refer to: Upshift Paddle Switch (307-05A External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
L3 CHECK THE UPSHIFT SIGNAL CIRCUIT VOLTAGE
  • Ignition OFF.
  • Disconnect the clockspring C218B.
  • Inspect the connector for damaged or pushed-out terminals.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218B-1 Ground

Is the voltage greater than 11 volts?
Yes GO to L12
No GO to L4
L4 CHECK THE UPSHIFT SIGNAL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect the TCM C1381B.
  • Inspect the connectors for damaged or pushed-out terminals.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218A-5 C1381B-6

Is the resistance less than 3 ohms?
Yes GO to L5
No REPAIR the circuit.
L5 CHECK THE UPSHIFT SIGNAL CIRCUIT FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218A-5 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to L6
No REPAIR the circuit.
L6 CHECK THE CLOCKSPRING CIRCUITS FOR AN OPEN
  • Connect the PCM.
  • Disconnect the clockspring.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    Component side C218B-1 Component side C218A-5

Is the resistance less than 3 ohms?
Yes
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No INSTALL a new clock spring.
Refer to: Clock Spring (501-20B Supplemental Restraint System, Removal and Installation).
L7 CHECK THE DOWNSHIFT SWITCH
  • Remove the driver air bag module.
    REFER TO: Driver Air Bag (501-20B Supplemental Restraint System, Removal and Installation).
  • Disconnect the downshift paddle switch C2429.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    Resistor contact 3 on shift paddle switch component side Resistor contact 4 on shift paddle switch component side

Is the resistance less than 1.5 ohms with the upshift switch pressed, and greater than 10,000 ohms when released?
Yes GO to L9
No INSTALL a new downshift paddle switch.
Refer to: Downshift Paddle Switch (307-05A External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
L8 CHECK THE DOWNSHIFT SIGNAL CIRCUIT VOLTAGE
  • Ignition OFF.
  • Disconnect the downshift paddle switch C2429.
  • Inspect the connector for damaged or pushed-out terminals.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C2429-4 Ground

Is the voltage greater than 11 volts?
Yes GO to L12
No GO to L9
L9 CHECK THE DOWNSHIFT SIGNAL CIRCUIT FOR AN OPEN
  • Ignition OFF.
  • Disconnect the PCM.
  • Inspect the connector for damaged or pushed-out terminals.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218B-2 C1381B-65

Is the resistance less than 3 ohms?
Yes GO to L10
No REPAIR the circuit.
L10 CHECK THE DOWNSHIFT SIGNAL CIRCUIT FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218B-2 Ground

Is the resistance greater than 10000 Ohms?
Yes GO to L11
No REPAIR the circuit.
L11 CHECK THE CLOCKSPRING CIRCUIT FOR AN OPEN
  • Connect the PCM.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    Component side C218B-2 Component side C218A-6

Is the resistance less than 3 ohms?
Yes
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No INSTALL a new clock spring.
Refer to: Clock Spring (501-20B Supplemental Restraint System, Removal and Installation).
L12 CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO GROUND
  • Remove the driver air bag module.
    REFER TO: Driver Air Bag (501-20B Supplemental Restraint System, Removal and Installation).
  • Disconnect the PCM.
  • The ignition is on.
  • Without Active Steering Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218A-7 Ground

Is the resistance greater than 10000 ohms?
Yes GO to L13
No REPAIR the circuit.
L13 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN
  • Connect the PCM.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C218A-7 C1381B-4

Is the resistance less than 3 ohms?
Yes
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No REPAIR the circuit.
L14 CHECK THE CLOCKSPRING CIRCUIT FOR AN OPEN
  • Connect the PCM C1381B.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    Component side C218A-7 Component side C218B-3

Is the resistance less than 3 ohms?
Yes
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No INSTALL a new clock spring.
Refer to: Clock Spring (501-20B Supplemental Restraint System, Removal and Installation).
DIAGNOSTIC TEST M: DTC P0605, P0606, P0607, P06B8

Normal Operation and Fault Symptoms

When the GSM is initialized with the key, it performs internal memory and configuration tests and sets a DTC if this test fails.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0605:00 Internal Control Module Read Only Memory (ROM) Error: No Sub-type Information When the GSM is initialized with the key, it performs internal memory and configuration tests and sets a DTC if this test fails.
GSM P0606:00 Control Module Processor: No Sub-type Information When the GSM is initialized with the key, it performs internal memory and configuration tests and sets a DTC if this test fails.
GSM P0607:00 Control Module Performance: No Sub-type Information When the GSM is initialized with the key, it performs internal memory and configuration tests and sets a DTC if this test fails.
GSM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub-type Information When the GSM is initialized with the key, it performs internal memory and configuration tests and sets a DTC if this test fails.
GSM P164E:00 Transmission Range Select Internal Control Module Performance: No Sub-type Information When the GSM is initialized with the key, it performs internal memory and configuration tests and sets a DTC if this test fails.

Possible Sources

  • Incorrect or damaged GSM calibration.
M1 CHECK DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, program the GSM.
  • Wait 10 seconds.
  • Using the diagnostic scan tool, perform a GSM self-test.

Are DTCs P0605, P0606, P0607, P06B8, or P164E present?
Yes INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The fault may be an incorrect PCM calibration.
DIAGNOSTIC TEST N: DTC U0301

For circuit and connector information, refer to Wiring Diagrams Cell 14.

Normal Operation and Fault Symptoms

The GSM and PCM frequently exchange data to control transmission shift sequences. It sets a DTC if the GSM detects an incorrect PCM software set.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0301:00 Software Incompatibility with ECM/PCM: No Sub-type Information The transmission cannot exit park. CLEAR the DTCs. REPROGRAM the original PCM with the latest PCM software. PERFORM the PCM self-test. If the DTC returns,
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.

Possible Sources

  • Incorrect or corrupted PCM calibration.
N1 CHECK DIAGNOSTIC TROUBLE CODES (DTCS)
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, program the PCM. REPROGRAM the original PCM with factory data, following the scan tool instructions.
  • Wait 10 seconds.
  • Using the diagnostic scan tool, perform a PCM self-test.

Is DTC U0301 set in the GSM?
Yes
Click here to access the guided routine (PCM). Internet Explorer version 11 or later is required to perform this Pinpoint test.
No The fault may be an incorrect PCM calibration.
DIAGNOSTIC TEST O: TRANSMISSION STICKS IN PARK

Normal Operation and Fault Symptoms

  • Low Line Pressure
    • Perform a line pressure test. If line pressure is low, refer to the Line Pressure Diagnosis Chart for further diagnosis. Refer to: Special Testing Procedures (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).
  • Park Lock Pawl Solenoid
    • Check whether the park pawl solenoid pin is stuck in the extended position. Refer to: Park Lock Pawl Solenoid (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
  • Internal Transmission Park Components
    • Inspect the park pawl, park pawl actuator rod, TR sensor and park return spring for damage or binding. Make sure all park components are correctly installed and connected. REPAIR or INSTALL new components as necessary. Refer to: Transmission (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Overhaul).
    • Remove and inspect the park pawl valve. If the valve or bore is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
  • Park Hydraulic Circuits Blocked or Leaking
    • Disassemble the main control valve body and inspect the park brake lock valve hydraulic circuits for damage, leakage or blockage. CLEAN or INSTALL new components as necessary. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Overhaul).
  • Clutch Malfunction
    • The electronic 10R transmission uses hydraulic pressure from clutches B and D to push the system out of park. Check clutches B and D for non-applied condition. Refer to: Clutch B (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).
      Refer to: Clutch D (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).

Possible Sources

  • Low Line Pressure
  • Park Pawl Solenoid
  • Park Pawl Components
  • Clutch malfunction
No diagnostic actions are available for this symptom or DTC. Refer to: Diagnostic Methods (100-00 General Information, Description and Operation).
DIAGNOSTIC TEST P: TRANSMISSION AUTOMATICALLY RETURNS TO PARK

Normal Operation and Fault Symptoms

  • Return-to-Park criteria are met.
    • Check the system for normal operation. Refer to: External Controls - System Operation and Component Description (307-05A External Controls - 10-Speed Automatic Transmission - 10R60, Description and Operation).
  • Driver Door Ajar Switch, Electrical Circuits, Body Control Module (BCM) or Gear Shift Module (GSM) Malfunction
    • Open, then close the driver door and cycle the door locks. If the door ajar indicator lamp on the IPC or the door lock and unlock functions do not operate correctly, REFER to: Locks, Latches and Entry Systems (501-14 Door Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
    • If the door is ajar and the locks operate correctly, GO to Pinpoint Test I.

Possible Sources

  • Normal System Operation
  • Driver door ajar sensor or circuit
  • BCM
  • GSM
No diagnostic actions are available for this symptom or DTC. Refer to: Diagnostic Methods (100-00 General Information, Description and Operation).
DIAGNOSTIC TEST Q: TRANSMISSION DOES NOT RETURN TO PARK WHEN DOOR IS OPENED

Normal Operation and Fault Symptoms

  • Driver Door Ajar Switch, Electrical Circuits, Body Control Module (BCM) or Gear Shift Module (GSM) Malfunction
    • Open the driver door and cycle the door locks. If the door ajar indicator lamp does not illuminate on the IPC or the door lock and unlock functions do not operate correctly, REFER to: Locks, Latches and Entry Systems (501-14 Door Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
    • If the door is ajar and the locks operate correctly, GO to Pinpoint Test I.

Possible Sources

  • Driver door ajar sensor or circuit
  • BCM
  • GSM
No diagnostic actions are available for this symptom or DTC. Refer to: Diagnostic Methods (100-00 General Information, Description and Operation).
DIAGNOSTIC TEST R: PARK DOES NOT ENGAGE

Normal Operation and Fault Symptoms

  • Manual Park Release
    • Make sure the park mechanism is not manually released. REFER to: Manual Transmission Range Unlock with Wire (307-05A External Controls Automatic Transmission - 10-Speed Automatic Transmission - 10R60, General Procedures).
  • Clutch Malfunction
    • After exiting park, the shift-by-wire 10R transmission variant uses hydraulic pressure from clutch A, B, C, D or F to hold the system in a non-drive position. If any other observed symptoms indicate that one of these clutches is stuck, RESOLVE that symptom first. REFER to: Symptom Chart (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Diagnosis and Testing).
  • Park Lock Pawl Solenoid
    • Check whether the park pawl solenoid pin is stuck in the extended position. Refer to: Park Lock Pawl Solenoid (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
  • Internal Transmission Park Components
    • Inspect the park pawl, park pawl actuator rod, TR sensor and park return spring for damage or binding. Make sure all park components are correctly installed and connected. REPAIR or INSTALL new components as necessary. Refer to: Transmission (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Overhaul).
    • Remove and inspect the park pawl valve. If the valve or bore is damaged, INSTALL a new main control valve body. Refer to: Main Control Valve Body (307-01A Automatic Transmission - 10-Speed Automatic Transmission - 10R60, Removal and Installation).

Possible Sources

  • Park Manual Release
  • Clutch malfunction
  • Internal transmission components
No diagnostic actions are available for this symptom or DTC. Refer to: Diagnostic Methods (100-00 General Information, Description and Operation).
DIAGNOSTIC TEST: SHIFT SELECTORS OPERATE INCORRECTLY

Normal Operation and Fault Symptoms

Each steering wheel paddle switch is a momentary contact switch built into the steering wheel. When the M button on the rotary gearshift knob is pressed, the upshift/downshift function is activated, and the steering wheel paddles allow the operator to shift up and down without removing hands from the steering wheel.

Possible Sources

  • GSM Malfunction
  • Module communication concern
  • Steering wheel switch concern
S1 CHECK MANUAL RANGE SELECTION ON GSM (GEAR SELECTOR MODULE)
  • Start the engine.
  • Select DRIVE.
  • Press the M button on the gear selector.

Is the M button indicator illuminated on the GSM?
Yes GO to S2
No GO to S3
S2 CHECK MANUAL RANGE SELECTION ON IPC (INSTRUMENT PANEL CLUSTER)
  • Start the engine.
  • Select DRIVE.
  • Press the M button on the gear selector.

Does the PRNDM indicator on the IPC show that M is selected?
Yes GO to Pinpoint Test L
No RESOLVE any network communication diagnostic trouble codes (DTCs) present in the GSM, PCM, IPC or GWM.
S3 CHECK GSM (GEAR SELECTOR MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all GSM connectors.
  • Repair:
    • corrosion (install new connector or terminals - clean module pins)
    • damaged or bent terminals/pins - install new terminals/pins
    • pushed-out pins - install new pins as necessary
  • Reconnect the GSM connectors. Make sure they are fully seated and locked.
  • Start the system and verify the concern is still present.

Is the concern still present?
Yes CHECK OASIS for applicable TSBs. If a TSB applies to this condition, STOP this test and FOLLOW the TSB instructions. If no TSB addresses this condition, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05A Automatic Transmission External Controls - 10-Speed Automatic Transmission - 10R60, Removal and Installation).
No The system is currently operating correctly. The concern may have been caused by module connections. ADDRESS the root cause of any connector or terminal issues.

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