Powertrain

Torque Converter Clutch (TCC) - Diagnosis and Testing

In this manual: Powertrain

~5min read

For operation of the TCC,
REFER TO: Transmission Description - System Operation and Component Description (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Description and Operation).

Symptom Chart

Symptom	Possible Sources	Action
TCC not applied	TCC solenoid filter screen is blocked	INSTALL a new TCC solenoid.
	TCC solenoid mechanically stuck off	INSTALL a new TCC solenoid.
	TCC regulator valve stuck in the OFF position	DISASSEMBLE, CLEAN and INSPECT the TCC regulator valve. If the orifice or valve is damaged, INSTALL a new main control valve body. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC control valve stuck in the OFF position	INSTALL a new pump assembly. REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC APPLY hydraulic circuit is blocked or leaking	DISASSEMBLE and INSPECT the transmission, main control valve body passages and pump assembly for debris/blockage/leaks. CLEAN or REPLACE components as necessary. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC friction material worn or damaged.	INSTALL a new torque converter. REFER TO: Transaxle (307-01A). REFER TO: Transmission - 1.5 L EcoBoost (118 kW/160 L PS) - I4 (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Removal and Installation). REFER TO: Transmission - 2 L EcoBoost (184 kW/250 L PS) - MI4 (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Removal and Installation).
TCC always applied / vehicle stopping	TCC solenoid mechanically stuck on	INSTALL a new TCC solenoid.
	TCC regulator valve stuck on	DISASSEMBLE, CLEAN and INSPECT the TCC regulator valve. If the orifice or valve is damaged, INSTALL a new main control valve body. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC control valve stuck in the ON position	INSTALL a new pump assembly. REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC RELEASE hydraulic circuit is blocked or leaking	DISASSEMBLE and INSPECT the transmission, main control valve body passages and pump assembly for debris/blockage/leaks. CLEAN or REPLACE components as necessary. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC is welded or damaged.	INSTALL a new torque converter. REFER TO: Transaxle (307-01A). REFER TO: Transmission - 1.5 L EcoBoost (118 kW/160 L PS) - I4 (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Removal and Installation). REFER TO: Transmission - 2 L EcoBoost (184 kW/250 L PS) - MI4 (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Removal and Installation).
TCC cycling, shudder or chatter	Incorrect shift strategy programmed in PCM
	TCC solenoid filter or TCC solenoid seal is damaged	INSTALL a new TCC solenoid.
	TCC solenoid mechanically sticking	INSTALL a new TCC solenoid.
	TCC regulator valve, springs, retainers loose, stuck, binding, missing, incorrectly assembled	DISASSEMBLE, CLEAN and INSPECT the TCC regulator valve. If the orifice or valve is damaged, INSTALL a new main control valve body. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC control valve, springs, retainers loose, stuck, binding, missing, incorrectly assembled	INSTALL a new pump assembly. REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC RELEASE/TCC APPLY hydraulic circuit is blocked or leaking	DISASSEMBLE and INSPECT the transmission, main control valve body passages and pump assembly for debris/blockage/leaks. CLEAN or REPLACE components as necessary. REFER TO: Main Control Valve Body (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul). REFER TO: Transmission (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Overhaul).
	TCC Shudder / Vibration / Chatter	Verify the TCC concern. Attempt to duplicate the event while commanding the TCC_OSC PID OFF. If the concern cannot be duplicated while the TCC is disabled, the TCC may be worn or damaged. REFER TO: Transmission (307-01A). REFER TO: Transmission - 1.5 L EcoBoost (118 kW/160 L PS) - I4 (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Removal and Installation). REFER TO: Transmission - 2 L EcoBoost (184 kW/250 L PS) - MI4 (307-01A Automatic Transmission - 6-Speed Automatic Transmission - 6F35, Removal and Installation).

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