Ford Escape Quiz
Powertrain

Diagnosis and Testing - External Controls

In this manual: Powertrain
General Information — 26Chassis — 160Powertrain — 323Electrical — 356Body and Paint — 290
~51min 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).


Module Trouble Code Description Action
GSM P0562:00 System Low Voltage: No Sub-type Information GO to Pinpoint Test A
GSM P0563:00 System High Voltage: No Sub-type Information GO to Pinpoint Test B
GSM P0605:00 Internal Control Module Read Only Memory (ROM) Error: No Sub-type Information GO to Pinpoint Test G
GSM P0606:00 Control Module Processor: No Sub-type Information GO to Pinpoint Test G
GSM P0607:00 Control Module Performance: No Sub-type Information GO to Pinpoint Test G
GSM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub-type Information GO to Pinpoint Test G
GSM P07EC:00 Multifunction Transmission Range Selection Circuit: No Sub-type Information GO to Pinpoint Test F
GSM P07ED:00 Multifunction Transmission Range Selection Circuit Stuck: No Sub-type Information GO to Pinpoint Test F
GSM P0814:00 Transmission Range Indicator Circuit: No Sub-type Information GO to Pinpoint Test C
GSM P0915:00 Shift Position Circuit "A" Range/Performance: No Sub-type Information GO to Pinpoint Test C
GSM P0929:00 Shift Interlock Solenoid/Actuator Circuit Range/Performance: No Sub-type Information GO to Pinpoint Test D
GSM P0929:77 Shift Interlock Solenoid/Actuator Circuit Range/Performance: Commanded Position Not Available GO to Pinpoint Test D
GSM P164E:00 Transmission Range Select Internal Control Module Performance: No Sub-type Information GO to Pinpoint Test G
GSM P166B:00 Driver Door Status Correlation: No Sub-type Information GO to Pinpoint Test E
GSM P1753:00 Shift Position Sensor Alignment: No Sub-type Information GO to Pinpoint Test C
GSM U0100:00 Lost Communication with ECM/PCM 'A': No Sub Type Information GO to Pinpoint Test K
GSM U0100:87 Lost Communication with ECM/PCM 'A': No Sub-type Information GO to Pinpoint Test H
GSM U0121:00 Lost Communication with Anti-Lock Brake System (ABS) Control Module 'A': No Sub-type Information GO to Pinpoint Test K
GSM U0140:00 Lost Communication With Body Control Module: No Sub Type Information GO to Pinpoint Test K
GSM U0155:00 Lost Communication with Instrument Panel Cluster (IPC) Control Module: No Sub Type Information GO to Pinpoint Test K
GSM U0301:00 Software Incompatibility with ECM/PCM: No Sub-type Information GO to Pinpoint Test I
GSM U0401:00 Incorrect Data Received from ECM/PCM 'A': No Sub Type Information GO to Pinpoint Test L
GSM U0422:00 Incorrect Data Received from Body Control Module: No Sub Type Information GO to Pinpoint Test L
GSM U1011:00 Incorrect Internal Control Module Monitor Data Received from ECM/PCM: No Sub-type Information GO to Pinpoint Test J
GSM U101F:00 Invalid Internal Control Module Monitor Data Received from Transmission Range Control Module: No Sub-type Information GO to Pinpoint Test J

Global Customer Symptom Codes (GCSC) Table

In most cases, the GSM will set a diagnostic trouble code to aid diagnosis. Refer to the Diagnostic Trouble Code Index before using the Symptom Chart. The Customer Symptom column lists the vehicle condition. The Action column refers to the specific test. Each specific test lists the components that may cause the symptom. The components are listed in disassembly order. Use the component list and the directed action to identify the root cause of the concern.


Symptom Action
Start/Run/Move > Move > Gear Selector > Not Operating GO to Pinpoint Test D
Start/Run/Move > Move > Gear Selector > Not Operating GO to Pinpoint Test N
Start/Run/Move > Move > Gear Selector > Not Operating GO TO Pinpoint Test O
Start/Run/Move > Move > Shift Quality > Park GO to Pinpoint Test M
Start/Run/Move > Move > Shift Quality > Park GO to Pinpoint Test P

Pinpoint Tests


PINPOINT TEST A: 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 dual 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.

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 or Charging System
  • BCM Fuse
  • Open or Shorted Circuit
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • GSM
A1 RECHECK THE GSM (GEAR SELECTOR MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Ignition OFF.
  • The ignition is on.
  • Wait 10 seconds.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P0562 still present?
Yes GO to A2
No The system is currently operating correctly. The DTC may have been set due to a previous low battery voltage condition.
A2 CHECK FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS) IN OTHER MODULES
  • Using the diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from all modules.

Are any low voltage diagnostic trouble codes (DTCs) present in other modules?
Yes CHECK the vehicle charging concern.
REFER TO: Direct Current (DC) to DC Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to A3
A3 CHECK THE BATTERY CONDITION AND CHARGE
  • Perform the battery state of health test.
    REFER TO: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the battery pass the condition check?
Yes GO to A4
No INSTALL a new battery.
REFER TO: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).
A4 CHECK THE GSM (GEAR SELECTOR MODULE) VOLTAGE
  • Ignition OFF.
  • Disconnect the GSM C3532.
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-1 Ground

Is the voltage within 1 volt of the recorded battery voltage?
Yes GO to A5
No CHECK that BCM fuse 21 (7.5A) is in good condition.
If OK, REPAIR the faulty circuit for high resistance or an open.
If not OK, REFER TO the wiring diagrams to determine the cause of the short circuit.
A5 CHECK THE GSM (GEAR SELECTOR MODULE) GROUND CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-18 Ground
    C3532-9 Ground

Is the resistance less than 3 ohms?
Yes GO to A6
No Make sure the G200 ground is clean and properly secured. If OK, REPAIR the open circuit.
A6 CHECK THE GSM (GEAR SELECTOR MODULE) FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST B: 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 dual ground circuits. A malfunctioning charging system or overcharging conditions may cause the GSM to set a DTC. This DTC may also be set in the GSM due to a battery discharge or jump-start events.

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 continuous memory if the voltage supplied to the GSM exceeds 16 volts.

Possible Sources

  • Charging System Concern
  • Battery Charging or Jump Start
  • GSM
B1 CHECK FOR HIGH VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS) IN OTHER MODULES
  • Using the diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from all modules.

Are any high voltage diagnostic trouble codes (DTCs) present in other modules?
Yes CHECK the vehicle charging concern.
REFER TO: Direct Current (DC) to DC Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to B2
B2 CHECK THE BATTERY VOLTAGE
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Turn off all interior lights, exterior lights and accessories.
  • NOTE: Do not allow the engine speed to exceed 2000 RPM during this step, otherwise the generator may self-excite, resulting in the charging system output voltage defaulting high. If the 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 13 and 15.2 volts?
Yes GO to B3
No CHECK the charging system.
REFER TO: Direct Current/Direct Current (DC/DC) Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
B3 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) P0563
  • Ignition OFF.
  • The ignition is on.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P0563 still present?
Yes GO to B4
No The system is currently operating normally. The DTC may have been set previously during battery charging or when jump-starting the vehicle.
B4 VERIFY GSM (GEAR SHIFT MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST C: P0814, P0915, P1753

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

Normal Operation and Fault Symptoms

The GSM uses 2 sensors to monitor the position of the rotary shifter knob. Based on the readings of these two sensors, the GSM will illuminate the correct gear indicator LED and it will communicate the selected gear to other modules. The GSM monitors the 2 sensors for correct frequency, for staying within the allowable bandwidth, and for agreement with each other. The GSM monitors each gear indicator LED for circuit integrity, as well as for correct illumination relative to the selected gear.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0814:00 Transmission Range Indicator Circuit: No Sub-type Information This DTC indicates that the GSM has detected a fault with the gear indicator LED.
GSM P0915:00 Shift Position Circuit "A" Range/Performance: No Sub-type Information This DTC indicates that the GSM has detected a fault with one or both of the sensors measuring the rotary knob position.
GSM P1753:00 Shift Position Sensor Alignment: No Sub-type Information This DTC indicates that the GSM has detected the rotary knob outside of the calibrated range for more than 60 seconds.

Possible Sources

  • GSM Calibration
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • GSM
C1 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.

Are there any system voltage or internal module diagnostic trouble codes (DTCs)?
Yes FIRST RESOLVE these diagnostic trouble codes (DTCs). REFER TO the DTC Chart.
No GO to C2
C2 CHECK THE GSM (GEAR SHIFT MODULE) CALIBRATION LEVEL
  • Verify that the GSM calibration is at the latest level.

Is the GSM calibration at the latest level?
Yes GO to C3
No PROGRAM the GSM with the latest calibration.
REFER TO: Module Programming (418-01 Module Configuration, General Procedures). If the DTC returns, GO to C3.
C3 CHECK THE ROTARY KNOB AND INDICATOR LED (LED) OPERATION
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Ignition OFF.
  • Wait 10 seconds.
  • The ignition is on.
  • Move the rotary knob to each gear position. Pause at each position for at least 60 seconds.
  • Observe the illumination of each gear indicator LED as the rotary knob is moved to each position.
  • With Drive selected, press the center button to activate Sport mode. Observe the center button LED illumination.

Does each gear indicator LED illuminate correctly when the rotary knob is moved to each gear position and when the center button is pressed?
Yes GO TO C4
No GO to C5
C4 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a GSM self-test.

Are DTCs P0814:00, P0915 and/or P1753 present?
Yes GO to C5
No The fault is not present at this time.
C5 VERIFY GSM (GEAR SHIFT MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST D: BRAKE TRANSMISSION SHIFT INTERLOCK (BTSI) SYSTEM DOES NOT OPERATE CORRECTLY

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

Normal Operation and Fault Symptoms

The Brake Shift Interlock (BTSI) system prevents the shift knob from leaving the Park position unless certain conditions are met. To release the Brake Shift Interlock (BTSI), the ignition must be on and the brake pedal must be applied. With the ignition on, when the brake pedal is pressed and the PCM does not command the Brake Shift Interlock (BTSI) to be engaged, the GSM will release the shift lock.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P0929:00 Shift Interlock Solenoid/Actuator Circuit Range/Performance: No Sub-type Information This DTC indicates that the GSM has detected a maximum stop current in the shift lock solenoid circuit.
GSM P0929:77 Shift Interlock Solenoid/Actuator Circuit Range/Performance: Commanded Position Not Available This DTC indicates that the GSM was unable to lock the rotary knob in the Park position.

Possible Sources

  • Discharged Battery/Charging System
  • Brake Switch
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • GSM
D1 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.

Are there any system voltage or internal module diagnostic trouble codes (DTCs)?
Yes FIRST RESOLVE these diagnostic trouble codes (DTCs). REFER TO the DTC Chart.
No GO to D2
D2 CHECK THE BRAKE SHIFT INTERLOCK (BTSI) SYSTEM OPERATION
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Ignition OFF.
  • The ignition is on.
  • Repeat the following steps 3 times:
    • Press the brake pedal.
    • Select Drive.
    • Select Park.
    • Release the brake pedal.
    • Wait 1 minute.
    • With the brake pedal released, attempt to move the rotary knob out of the Park position. The rotary knob must be locked in the Park position with the brake pedal released.

Is the Brake Shift Interlock (BTSI) system operating correctly?
Yes GO to D4
No GO to D3
D3 CHECK THE BRAKE SWITCH OPERATION

  • Access the PCM and monitor the BOO1 PID

  • Press and release the brake pedal while observing the BOO1 PID.

Does the BOO1 PID state change appropriately when the brake pedal is pressed and released?
Yes GO to D5
No RESOLVE any brake switch diagnostic trouble codes (DTCs) present in the PCM. REFER TO the Powertrain Control DTC Chart.
D4 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P0929:00 and/or P0929:77 present?
Yes GO to D5
No The concern is not present at this time.
D5 VERIFY GSM (GEAR SHIFT MODULE) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST E: P166B

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

Normal Operation and Fault Symptoms

The GSM monitors the driver door status using two driver door ajar switches. If the driver door is opened while the vehicle is moving, the transmission will shift to Park and the GSM indicator will automatically change to Park.

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 from the two driver door ajar switch inputs. This DTC sets if these inputs do not pass a rationality check between each other.

Possible Sources

  • Perform GSM self-test with driver door not fully closed
  • Damaged connectors or pushed-out terminals, open circuit, short to power or ground
  • Driver door ajar switch 1
  • Driver door ajar switch 2
  • GSM
E1 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) P166B
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Ignition OFF.
  • The ignition is on.
  • Repeat the following steps 5 times:
    • Open the driver door.
    • Wait 5 seconds.
    • Close the driver's door.
    • Wait 5 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 E2
No The system is currently operating correctly. The DTC may have been set by performing the self-test without the driver door fully closed.
E2 CHECK THE DOOR AJAR WARNING SYSTEM OPERATION
  • The ignition is on.
  • Open and close the driver door while observing the door ajar indicator on the IPC.

Does the door ajar indicator on the IPC turn on and off correctly when the driver door is opened and closed?
Yes GO to E3
No First REPAIR the door latch malfunction.
REFER TO: Locks, Latches and Entry Systems (501-14 Door Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
E3 MONITOR THE DOOR AJAR PARAMETER IDENTIFICATION (PID)

  • 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 the DR_AJAR_HWI and DR_UNLCK_HWI PIDs.

Do both parameter identification (PID) values change correctly when the driver door is opened and closed?
Yes GO to E7
No GO to E4
E4 CHECK THE DOOR AJAR CIRCUITS FOR AN OPEN CIRCUIT
  • Ignition OFF.
  • Disconnect the GSM C3532.
  • Disconnect the C2280F connector.
  • Disconnect the left front door latch C526A connector.
  • Disconnect the left front door latch C526B connector.
  • Inspect the connectors for damaged or pushed-out terminals.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-15 C526A-4
    C3532-4 C526B-2

Is the resistance less than 3 ohms?
Yes GO to E5
No REPAIR the open circuit.
E5 CHECK THE DOOR AJAR CIRCUITS FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-4 Ground
    C3532-15 Ground

Is the resistance greater than 10000 ohms?
Yes GO to E6
No REPAIR the short to ground.
E6 CHECK THE DOOR AJAR CIRCUITS FOR A SHORT TO POWER
  • The ignition is on.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-4 Ground
    C3532-15 Ground

Is there voltage present?
Yes REPAIR the short to power.
No INSTALL a new driver door latch.
REFER TO: Front Door Latch (501-14 Door Handles, Locks, Latches and Entry Systems, Removal and Installation).
E7 CHECK THE GSM (GEAR SHIFT MODULE) FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST F: GSM (GEAR SHIFT MODULE) CENTER BUTTON DOES NOT OPERATE CORRECTLY

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

Normal Operation and Fault Symptoms

The rotary shift knob contains three internal contact switches under the center button. When the button is pressed, the 3 switches send a signal to the GSM. The GSM sets a DTC if the three switch signals do not agree, or if it detects a possible stuck switch.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM P07EC:00 Multifunction Transmission Range Selection Circuit: No Sub-type Information This DTC sets if 1 of the 3 center button contacts does not agree with the other 2 contacts.
GSM P07ED:00 Multifunction Transmission Range Selection Circuit Stuck: No Sub-type Information This DTC sets if the GSM detects that the center button is pressed for more than 60 seconds.

Possible Sources

  • Debris or foreign material on or near the GSM center button
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • GSM
  • Customer holding the center button pressed
F1 CHECK THE GSM (GEAR SHIFT MODULE) CENTER BUTTON
  • Inspect the GSM center button for debris or foreign material that could cause it to stick.
  • Press and release the GSM 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 F2
No CLEAN the button of debris or foreign material.
If the button still sticks after cleaning, INSTALL a new GSM.
REFER TO: Gear Shift Module (GSM) (307-05B Automatic Transmission, External Controls - Automatic Transmission - HF45, Removal and Installation). Otherwise, GO to F2.
F2 CHECK THE GSM (GEAR SHIFT MODULE) CENTER BUTTON PID (PARAMETER IDENTIFICATION) STATUS

  • Access the GSM and monitor the SBW_SLM_SW_1 PID

  • Access the GSM and monitor the SBW_SLM_SW_2 PID

  • Access the GSM and monitor the SBW_SLM_SW_3 PID

  • Press and release the GSM center button while monitoring the PIDs.

Do all switch PID values change correctly when the center button is pressed and released?
Yes GO to F3
No GO to F4
F3 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Ignition OFF.
  • The ignition is on.
  • Wait 2 minutes.
  • Repeat the following steps 20 times:
    • Press and hold the center button for 3 seconds.
    • Release the center button for 3 seconds.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P07EC:00 and/or P07ED:00 present?
Yes GO to F4
No At this time the GSM center button is operating correctly. The concern may have been caused by debris or interference on the GSM center button, or by the customer holding the button pressed.
F4 CHECK THE GSM (GEAR SHIFT MODULE) FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Operate the system and determine if the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST G: INTERNAL MODULE FAULT DIAGNOSTIC TROUBLE CODES (DTCS)

Normal Operation and Fault Symptoms

The GSM performs periodic self-checks. It sets a DTC if any of the results are outside normal operating standards.

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 The GSM detected a ROM checksum error.
GSM P0606:00 Control Module Processor: No Sub-type Information The GSM detected a reset without a proper sleep cycle.
GSM P0607:00 Control Module Performance: No Sub-type Information The GSM detected an early or late response of more than 10 percent of its periodic rate.
GSM P06B8:00 Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub-type Information The GSM detected a RAM checksum error.
GSM P164E:00 Transmission Range Select Internal Control Module Performance: No Sub-type Information The GSM detected a power-up test failure, program flow monitor failure, IPC software failure, or 5V_1_MONITOR failure.

Possible Sources

  • Discharged Battery/Charging System
  • GSM Calibration
  • GSM
G1 CHECK THE GSM (GEAR SHIFT MODULE) FOR CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS)
  • The ignition is on.
  • Using the diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.

Is DTC P0562 or P0563 present in the GSM?
Yes First RESOLVE these diagnostic trouble codes (DTCs). REFER TO the GSM DTC Chart.
No GO to G2
G2 PROGRAM THE GSM (GEAR SHIFT MODULE) WITH THE LATEST SOFTWARE
  • The ignition is on.
  • Clear all Diagnostic Trouble Codes (DTCs) from the TCM.
  • Reprogram the TCM with the latest software.
    REFER TO: Module Programming (418-01 Module Configuration, General Procedures).
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC P0605, P0606, P0607, P06B8 or P164E present in the TCM?
Yes INSTALL a new GSM.
REFER to: Gear Shift Module (GSM) (307-05B Automatic Transmission External Controls — Automatic Transmission – HF45, Removal and Installation).
No The fault is not present at this time. This may have been caused by a module programming error.
PINPOINT TEST H: U0100:87

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

Normal Operation and Fault Symptoms

In addition to communicating over HS-CAN, the TCM and SOBDMC communicate over a private CAN link. If the TCM does not receive the expected messages from the SOBDMC, it will set a DTC.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0100:87 Lost Communication with ECM/PCM 'A': No Sub-type Information For hybrid vehicles, this DTC indicates that the TCM did not receive some or all of the expected messages from the SOBDMC over the CAN link.

Possible Sources

  • Low system voltage
  • Open or Shorted Circuit
  • Incorrect PMI
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • SOBDMC malfunction
H1 CHECK ALL MODULES FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, review all Continuous Memory Diagnostic Trouble Codes (CMDTCs) in all modules.

Is a low voltage DTC set in any module?
Yes RESOLVE the vehicle voltage concern.
REFER TO: Direct Current/Direct Current (DC/DC) Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to H2
H2 CHECK THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC MODULE C) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a SOBDMC self-test.

Are there any Diagnostic Trouble Codes (DTCs) in the SOBDMC?
Yes First, RESOLVE these Diagnostic Trouble Codes (DTCs). REFER TO the Master DTC Table.
No If the SOBDMC does not respond to the diagnostic scan tool,
REFER TO: Communication Network (418-00 Communication Network, Diagnosis and Testing). Otherwise, GO to H3.
H3 CHECK THE TCM (TRANSMISSION CONTROL MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a GSM self-test.

Are there any system voltage codes or internal module Diagnostic Trouble Codes (DTCs) present in the TCM?
Yes First RESOLVE these diagnostic trouble codes (DTCs). REFER TO the GSM DTC Chart.
No GO to H4
H4 CHECK FOR OTHER CAUSES OF COMMUNICATION CONCERNS
  • Review the vehicle service history for recent service actions related to the SOBDMC or TCM. 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.

Were any causes of communication concerns found in the vehicle service history?
Yes Follow the above instructions to resolve the incorrect module replacement or configuration concern.
If the correct module was installed and the PMI was performed correctly, GO to H5.
No GO to H5
H5 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Road test the vehicle.
  • Using the diagnostic scan tool, perform a GSM self-test.

Did DTC U0100:87 return?
Yes GO to H6
No The system is currently operating correctly. The concern may have been caused by a high network traffic event or an intermittent fault condition.
H6 CHECK THE TRANSMISSION (CONTROLLER NETWORK) CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect the GSM C3532.
  • Disconnect the SOBDMC C199A.
  • 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
    C3532-13 C199A-32
    C3532-14 C199A-22

Is the resistance less than 3 ohms?
Yes GO to H7
No REPAIR the open circuit.
H7 CHECK THE TRANSMISSION (CONTROLLER NETWORK) CIRCUITS FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-13 Ground
    C3532-14 Ground

Is the resistance greater than 10000 ohms?
Yes GO to H8
No REPAIR the short to ground.
H8 CHECK THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC MODULE C) OPERATION
  • Ignition OFF.
  • Disconnect and inspect the TCM, SOBDMC and all related in-line electrical 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 disconnected electrical connectors. Make sure they are fully seated and locked.
  • Using the diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).
  • Road test the vehicle.
  • Perform a TCM self-test.

Did DTC U0100:87 return?
Yes CHECK the applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, discontinue this test and follow the bulletin instructions. If none resolves the concern, INSTALL a new SOBDMC.
REFER TO: Inverter System Controller [SOBDMC] (303-14D Electric Drive Control, Removal and Installation). After programming the new SOBDMC, PERFORM the transmission strategy download.
REFER TO: Transmission Strategy Download (307-01B Automatic Transmission - Automatic Transmission - HF45, 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.
PINPOINT TEST I: U0301

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

Normal Operation and Fault Symptoms

Several vehicle platforms share a common transmission but differ in other features, such as shift-by-wire. It is possible to install a SOBDMC that is compatible with the engine and transmission but not with shift-by-wire. A SOBDMC that is compatible with shift-by-wire will send a compatibility communication signal to the TCM. Each time the TCM wakes up, it checks whether a shift-by-wire compatible SOBDMC is installed in the vehicle.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0301:00 Software Incompatibility with ECM/PCM: No Sub-type Information For hybrid vehicles, this DTC indicates that a SOBDMC that is not compatible with shift-by-wire may have been installed in the vehicle. When this DTC is set, the TCM will not allow the vehicle to exit PARK.

Possible Sources

  • Low system voltage
  • Incorrect PMI
  • Incorrect or corrupted SOBDMC calibration
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • SOBDMC malfunction
I1 CHECK ALL MODULES FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, review all Continuous Memory Diagnostic Trouble Codes (CMDTCs) in all modules.

Is a low voltage DTC set in any module?
Yes First, RESOLVE the vehicle voltage concern.
REFER TO: Direct Current/Direct Current (DC/DC) Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to I2.
I2 CHECK FOR CAUSES OF COMMUNICATION CONCERNS
  • Review the vehicle service history for recent service actions related to the SOBDMC. 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.

Were any causes of communication concerns found in the vehicle service history?
Yes Follow the above instructions to resolve the incorrect module replacement or configuration concern.
If the correct module was installed and the PMI was performed correctly, GO to I3.
No GO to I3
I3 PROGRAM THE SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC MODULE C) WITH THE LATEST CALIBRATION
  • Using the diagnostic scan tool, program the SOBDMC with the latest calibration.
    REFER TO: Module Programming (418-01 Module Configuration, General Procedures).
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Ignition OFF.
  • Wait 10 seconds.
  • Start the engine.
  • Move the shift selector lever to each gear position. Drive the vehicle both forward and in reverse.
  • Using the diagnostic scan tool, perform a GSM self-test.

Is DTC U0301 present in the TCM?
Yes GO to I4
No No concern at this time. This may have been caused by an incorrect or damaged PCM calibration.
I4 CHECK SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC MODULE C) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all SOBDMC 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
  • Connect the SOBDMC connectors. Make sure they are fully seated and locked.
  • Operate the system and verify that the concern is still present.

Is the concern still present?
Yes CHECK the applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, discontinue this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new SOBDMC.
After programming the new SOBDMC, PERFORM the transmission strategy download.
REFER to: Transmission Strategy Download (307-01B Automatic Transmission - Automatic Transmission - HF45, General Procedures).
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.
PINPOINT TEST J: U1011, U101F

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

Normal Operation and Fault Symptoms

The GSM and SOBDMC communicate over both the HS-CAN and the private transmission CAN bus.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U1011:00 Incorrect Internal Control Module Monitor Data Received from ECM/PCM: No Sub-type Information On hybrid vehicles, this DTC indicates that the GSM received a checksum error from the SOBDMC over the HS-CAN.
GSM U101F:00 Invalid Internal Control Module Monitor Data Received from Transmission Range Control Module: No Sub-type Information On hybrid vehicles, this DTC indicates that the GSM received a checksum error from the SOBDMC over the transmission CAN bus.

Possible Sources

  • Low system voltage
  • Incorrect PMI
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • SOBDMC malfunction
J1 CHECK SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC MODULE C) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a SOBDMC self-test.

Are there any Diagnostic Trouble Codes (DTCs) in the SOBDMC?
Yes First, RESOLVE these Diagnostic Trouble Codes (DTCs). REFER TO the Master DTC Table.
No GO to J2
J2 CHECK ALL MODULES FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, review all Continuous Memory Diagnostic Trouble Codes (CMDTCs) in all modules.

Is a low voltage DTC set in any module?
Yes First, RESOLVE the vehicle voltage concern.
REFER TO: Direct Current/Direct Current (DC/DC) Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to J3
J3 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)
  • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs) from the GSM.
  • Road test the vehicle.
  • Using the diagnostic scan tool, perform a GSM self-test.

Did DTC U1011 and/or U101F return?
Yes GO to J4
No The system is currently operating correctly. The concern may have been caused by a high network traffic event or an intermittent fault condition.
J4 CHECK FOR OTHER CAUSES OF COMMUNICATION CONCERNS
  • Review the vehicle service history for recent service actions related to the SOBDMC. 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.

Were any causes of communication concerns found in the vehicle service history?
Yes Follow the above instructions to correct the incorrect module replacement or configuration.
If the correct module was installed and PMI was performed correctly, GO to J5.
No GO to J5
J5 CHECK SOBDMC (SECONDARY ON-BOARD DIAGNOSTIC MODULE C) OPERATION
  • Ignition OFF.
  • Disconnect and inspect all SOBDMC 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
  • Connect the SOBDMC connectors. Make sure they are fully seated and locked.
  • Operate the system and verify that the concern is still present.

Is the concern still present?
Yes CHECK the applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, discontinue this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new SOBDMC.
After programming the new SOBDMC, PERFORM the transmission strategy download.
REFER to: Transmission Strategy Download (307-01B Automatic Transmission - Automatic Transmission - HF45, General Procedures).
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.
PINPOINT TEST K: LOSS OF COMMUNICATION WITH ANOTHER MODULE

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

Normal Operation and Fault Symptoms

The GSM expects to receive network data from other modules over the HS-CAN2. The GSM sets a DTC when it does not receive the expected messages from another module. Other modules that require data from the suspect module may also set a Lost Message DTC.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0100:00 Lost Communication with ECM/PCM 'A': No Sub Type Information On hybrid vehicles, this DTC indicates that the GSM did not receive some or all of the expected messages from the SOBDMC over the HS-CAN2.
GSM U0121:00 Lost Communication with Anti-Lock Brake System (ABS) Control Module 'A': No Sub-type Information This DTC indicates that the GSM did not receive some or all of the expected messages from the ABS module over the HS-CAN2.
GSM U0140:00 Lost Communication With Body Control Module: No Sub Type Information This DTC indicates that the GSM did not receive some or all of the expected messages from the BCM over the HS-CAN2.
GSM U0155:00 Lost Communication with Instrument Panel Cluster (IPC) Control Module: No Sub Type Information This DTC indicates that the GSM did not receive some or all of the expected messages from the IPC over the HS-CAN2.

Possible Sources

  • Suspected Module Malfunction
  • Low system voltage
  • Incorrect PMI
  • High Network Traffic Event
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
K1 CHECK THE SUSPECT MODULE FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a self-test of the suspect module.

Are any Diagnostic Trouble Codes (DTCs) present in the suspect module?
Yes FIRST RESOLVE all Diagnostic Trouble Codes (DTCs) in the suspect module. REFER to the Principal Trouble Code Table.
No If the module does not respond to the scan tool, RESOLVE the no communication concern with the suspect module.
REFER to: Communication Network (418-00 Communication Network, Diagnosis and Testing). Otherwise, GO to K2.
K2 CHECK FOR LOST COMMUNICATION DIAGNOSTIC TROUBLE CODES (DTCS) IN OTHER MODULES
  • Using the diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from all modules.

Is a lost communication DTC for the suspect module present in any other modules?
Yes RESOLVE the intermittent no communication concern with the suspect module.
REFER to: Communication Network (418-00 Communication Network, Diagnosis and Testing).
No GO to K3
K3 CHECK ALL MODULES FOR LOW VOLTAGE DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, review all Continuous Memory Diagnostic Trouble Codes (CMDTCs) in all modules.

Is a low voltage DTC set in any module?
Yes First, RESOLVE the vehicle voltage concern.
REFER TO: Direct Current/Direct Current (DC/DC) Converter Module (414-05 Voltage Converter/Inverter, Diagnosis and Testing).
No GO to K4
K4 CHECK FOR OTHER CAUSES OF COMMUNICATION CONCERNS
  • CHECK the vehicle service history for recent service actions related to the suspect module or the 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.

Were any causes of communication concerns found in the vehicle service history?
Yes Follow the above instructions to correct the incorrect module replacement or configuration.
If the correct module was installed and PMI was performed correctly, GO to K5.
No GO to K5
K5 CHECK ALL INTERNAL BUS (NETWORK CONTROLLER) CONNECTORS
  • Ignition OFF.
  • Refer to the Wiring Diagrams, cell 14, for schematic and connector information. Disconnect all in-line CAN connectors between the GSM and the suspect module.
  • 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

Are there any connector or terminal concerns?
Yes REPAIR any connector or terminal concerns.
No Connect all electrical connectors. GO to K6.
K6 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)
  • Using the diagnostic scan tool, clear all Diagnostic Trouble Codes from the GSM.
  • Road test the vehicle.
  • Using the diagnostic scan tool, perform a GSM self-test.

Did the lost communication DTC return?
Yes If the lost communication DTCs related to the suspect module are now present in many other modules, GO to K7.
If the DTC returned only in the GSM, GO to K8.
No The system is currently operating correctly. The concern may have been caused by a high network traffic event or an intermittent fault condition.
K7 CHECK THE SUSPECT MODULE FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect all suspect module 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 connectors of the suspect module. Make sure they are fully seated and locked.
  • Operate the system and verify that the concern is still present.

Is the concern still present?
Yes CHECK the applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this condition, stop this test and follow the bulletin instructions. If the condition is not resolved, INSTALL a new suspect module.
For U0100, INSTALL a new SOBDMC.
After programming the new SOBDMC, PERFORM the transmission strategy download.
REFER TO: Transmission Strategy Download (307-01B Automatic Transmission - Automatic Transmission - HF45, General Procedures).
For U0121,
VIN is required to access the Guided Routine (ABS)
For U0140, INSTALL a new BCM. Refer to the removal and installation procedure in Section 419-10.
For U0155, INSTALL a new IPC. Refer to the removal and installation procedure in Section 413-01.
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.
K8 CHECK THE GSM (GEAR SHIFT MODULE) HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS FOR AN OPEN
  • Ignition OFF.
  • Disconnect the GSM C3532.
  • Disconnect the Gateway Module A C2431.
  • Inspect the connectors for damaged or pushed-out terminals.
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-3 C2431-18
    C3532-2 C2431-17

Is the resistance less than 3 ohms?
Yes GO to K9
No REPAIR the open circuit.
K9 CHECK THE GSM (GEAR SHIFT MODULE) HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS FOR A SHORT TO GROUND
  • Action:
    Click to display the connectors
    Positive lead Measurement/Action Negative lead
    C3532-3 Ground
    C3532-2 Ground

Are the resistances greater than 1000 Ohms?
Yes GO to K10
No REPAIR the short to ground.
K10 CHECK THE GSM (GEAR SHIFT MODULE) FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect the GSM connector.
  • 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
  • Connect the GSM connector. Make sure it is properly seated and latched.
  • Reconnect all other connectors that were previously disconnected.
  • Operate the system and verify that the concern is still present.

Is the concern still present?
Yes CHECK for an applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this concern, stop this test and follow the bulletin instructions. If none resolves this concern, INSTALL a new GSM.
REFER TO: Gear Selector Module (GSM) (307-05B Automatic Transmission External Controls - Automatic Transmission - HF45, 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.
PINPOINT TEST L: INVALID DATA RECEIVED FROM ANOTHER MODULE

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

Normal Operation and Fault Symptoms

The GSM expects to receive network data from other modules over HS-CAN2. The GSM will set a diagnostic trouble code if it receives an invalid or incomplete message from another module. Incomplete or corrupted messages are usually caused by high traffic that prevents the complete message from being received within the calibrated time limit.

DTC Fault Trigger Conditions

Trouble Code Description Fault Trigger Condition
GSM U0401:00 Incorrect Data Received from ECM/PCM 'A': No Sub Type Information For hybrid vehicles, this diagnostic trouble code indicates that the GSM is receiving messages from the SOBDMC, but the PCM reports errors in the key signals.
GSM U0422:00 Incorrect Data Received from Body Control Module: No Sub Type Information This DTC indicates that the GSM is receiving messages from the BCM, but the BCM reports errors in the key signals.

Possible Sources

  • High Network Traffic Event
  • Incorrect PMI
  • Damaged or backed-out terminals, corrosion, loose wires, and missing or damaged seals
  • Suspect module
L1 CHECK THE SUSPECT MODULE FOR DIAGNOSTIC TROUBLE CODES (DTCS)
  • Using the diagnostic scan tool, perform a self-test of the suspect module.

Are any Diagnostic Trouble Codes (DTCs) present in the suspect module?
Yes First RESOLVE any of these diagnostic trouble codes. REFER TO the Master DTC Chart.
No GO to L2
L2 ATTEMPT TO DUPLICATE THE DTC (DIAGNOSTIC TROUBLE CODE)
  • Using the diagnostic scan tool, clear all Diagnostic Trouble Codes from the GSM.
  • Road test the vehicle.
  • Using the diagnostic scan tool, perform a GSM self-test.

Did the DTC with incorrect data set again?
Yes GO to L3
No The system is currently operating correctly. The concern may have been caused by a high network traffic event.
L3 CHECK FOR OTHER CAUSES OF COMMUNICATION PROBLEMS
  • CHECK the vehicle service history for recent service actions related to the suspect module or the 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.

Were any causes of communication concerns found in the vehicle service history?
Yes Follow the instructions above to resolve the incorrect module replacement or configuration.
If the correct module was installed and the PMI was performed correctly, GO to L4.
No GO to L4
L4 CHECK ALL INTERNAL NETWORK (CONTROLLER AREA NETWORK) CONNECTORS
  • Ignition OFF.
  • Refer to the Wiring Diagrams, cell 14, for circuit and connector information. Disconnect and inspect all in-line CAN connectors between the GSM and the suspect module.
  • 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

Are there any connector or terminal concerns?
Yes REPAIR any connector or terminal concerns.
No GO to L5
L5 CHECK THE SUSPECT MODULE FOR PROPER OPERATION
  • Ignition OFF.
  • Disconnect and inspect all suspect module 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 connectors of the suspect module. Make sure they are fully seated and locked.
  • Operate the system and verify that the concern is still present.

Is the concern still present?
Yes CHECK the applicable TSB, GSB, SSM or FSA. If a service bulletin exists for this condition, stop this test and follow the bulletin instructions. If the condition is not resolved, INSTALL a new suspect module.
For U0401, INSTALL a new SOBDMC.
After programming the new SOBDMC, PERFORM the transmission strategy download.
REFER TO: Transmission Strategy Download (307-01B Automatic Transmission - Automatic Transmission - HF45, General Procedures).
For U0422, INSTALL a new BCM. Refer to the removal and installation procedure in Section 419-10.
No The system is currently operating correctly. The concern may have been caused by modules or network connections. REPAIR the root cause of any connector or pin issues.
PINPOINT TEST M: STUCK IN PARK

Normal Operation and Fault Symptoms

  • Brake Shift Interlock (BSI)
    • If the rotary knob is stuck in the initial position, GO to Location Test D.
    • If the rotary knob can be moved out of the PARK position but the transmission remains in the PARK position, continue with this pinpoint test.
  • Communication Module
    • Perform the self-test of the GSM, BCM and SOBDMC.
    • If any system voltage, internal module, or module communication diagnostic trouble codes (DTCs) are present, REFER TO the Master DTC Chart.
    • If any of the modules do not respond to the scan tool, REFER TO: Communication Network (418-00 Module Communications Network, Diagnosis and Testing).
  • Gear Shift Module (GSM)
    • If any diagnostic trouble codes (DTCs) are present in the GSM, RESOLVE them first. REFER TO the DTC Chart.
    • Using a scan tool, access the GSM and monitor the GEAR_CMD PID. Move the rotary knob through all gear positions and verify that the GEAR_CMD PID matches each gear position. If the GEAR_CMD PID does not change with the rotary knob position, INSTALL a new GSM. REFER TO: Gear Shift Module (GSM) (307-05B External Automatic Transmission Controls - Automatic Transmission - HF45, Removal and Installation).
  • Secondary On-Board Diagnostic Control Module C (SOBDMC)
    • If any diagnostic trouble codes (DTCs) related to the transmission or GSM are present in the SOBDMC, RESOLVE them first. REFER TO the Master DTC Chart.
  • Park Rod or Park Rod Guide Binding
    • Inspect the park rod and the park rod guide for damage or obstructions. REFER TO: Transmission (307-01B Automatic Transmission - Automatic Transmission - HF45, Disassembly and Assembly).

Possible Sources

  • GSM or SOBDMC Diagnostic Trouble Codes (DTCs)
  • GSM Malfunction
  • Internal transmission components
Diagnostic steps are not provided for this symptom or diagnostic trouble code. REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST N: 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 - Overview (307-05B External Automatic Transmission Controls - Automatic Transmission - HF45, Description and Operation).
  • Driver Door Ajar Switch, Electrical Circuits, Body Control Module (BCM), Gear Select Module (GSM)
    • Open and close the driver door. If the door ajar indicator on the instrument panel (IP) is illuminated with the door closed, refer to: Locks, Latches and Entry Systems (501-14 Door Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
    • If the door ajar system operates correctly, GO to Pinpoint Test E.

Possible Sources

  • Normal System Operation
  • Door Ajar System
  • Connector or terminal damaged, or circuit open or shorted
  • GSM Malfunction
Diagnostic steps are not provided for this symptom or diagnostic trouble code. REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST O: 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), Gear Select Module (GSM)
    • Open and close the driver door. If the door ajar indicator on the instrument panel (IP) is illuminated with the door closed, refer to: Locks, Latches and Entry Systems (501-14 Door Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
    • If the door ajar system operates correctly, GO to Pinpoint Test E.

Possible Sources

  • Door Ajar System
  • Connector or terminal damaged, or circuit open or shorted
  • GSM Malfunction
Diagnostic steps are not provided for this symptom or diagnostic trouble code. REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).
PINPOINT TEST P: PARK DOES NOT ENGAGE

Normal Operation and Fault Symptoms

  • Gear Shift Module (GSM)
    • If any diagnostic trouble codes (DTCs) are present in the GSM, RESOLVE them first. REFER TO the DTC Chart.
    • Using a scan tool, access the GSM and monitor the GEAR_CMD PID. Move the rotary knob through all gear positions and verify that the GEAR_CMD PID matches each gear position. If the GEAR_CMD PID does not change with the rotary knob position, INSTALL a new GSM. REFER TO: Gear Shift Module (GSM) (307-05B External Automatic Transmission Controls - Automatic Transmission - HF45, Removal and Installation).
  • Secondary On-Board Diagnostic Control Module C (SOBDMC)
    • If any diagnostic trouble codes (DTCs) related to the transmission or GSM are present in the SOBDMC, RESOLVE them first. REFER TO the Master DTC Chart.
  • Park Rod or Park Rod Guide Binding
    • Inspect the park rod and the park rod guide for damage or obstructions. REFER TO: Transmission (307-01B Automatic Transmission - Automatic Transmission - HF45, Disassembly and Assembly).

Possible Sources

  • GSM Malfunction
  • Park Manual Release
  • Internal Transmission Park Components
Diagnostic steps are not provided for this symptom or diagnostic trouble code. REFER TO: Diagnostic Methods (100-00 General Information, Description and Operation).

Test yourself

A quick Ford Escape quiz: every answer comes with an explanation and a link to the manual page.