Torque Converter Clutch (TCC)

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Front Pump Output Test

The front pump output test can be used to detect a stuck or inoperative main control torque converter clutch apply regulator valve.

Using a diagnostic scan tool, perform a self-test and check for DTCs.
RECORD the RPM and TSS data while raising the engine RPM.
If the TSS stays at 0 RPM the torque converter is malfunctioning.
INSPECT the main control torque converter clutch apply regulator valve. REFER to: Main Control Valve Body .

For torque converter operation, REFER to: Torque Converter .

Condition	Possible Sources	Action
TCC does not apply	TCC solenoid mechanically stuck OFF	INSTALL a new solenoid. REFER to: Shift Solenoids (SS) . CARRY OUT the Transmission Strategy Download. REFER to: Transmission Strategy Download .
	Pump feed seals damaged or leaking	REMOVE the main control valve body and INSPECT the pump feed seals for damage or leaks. INSTALL new seals. REFER to: Main Control Valve Body .
	TCC apply regulator valve stuck OFF	DISASSEMBLE, CLEAN and INSPECT the TCC apply regulator valve. If the bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	TCC charge control valve stuck	DISASSEMBLE, CLEAN and INSPECT the TCC charge control valve. If the bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	NDX, SP, TCCZ, CAPY, CRLZ hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. REFER to: Main Control Valve Body .
	TCC friction material worn or damaged	INSTALL a new torque converter. REFER to: Transmission . REFER to: Transmission .
TCC always applied/stalls vehicle	TCC solenoid mechanically stuck ON	INSTALL a new solenoid. REFER to: Shift Solenoids (SS) . CARRY OUT the Transmission Strategy Download. REFER to: Transmission Strategy Download .
	TCC apply regulator valve stuck ON	DISASSEMBLE, CLEAN and INSPECT the TCC apply regulator valve. If the bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	TCC charge control valve stuck	DISASSEMBLE, CLEAN and INSPECT the TCC charge control valve. If bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	Main control valve body cross leaking into TCCZ, CAPY hydraulic circuits	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for cracks, warping, and damage. If damage is found, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	TCC friction material worn or damaged	INSTALL a new torque converter. REFER to: Transmission . REFER to: Transmission .
TCC cycles, shudders or chatters	Incorrect Transmission Strategy programmed into PCM.	CARRY OUT the Transmission Strategy Download. REFER to: Transmission Strategy Download .
	TCC solenoid mechanically sticking	INSTALL a new solenoid. REFER to: Shift Solenoids (SS) . CARRY OUT the Transmission Strategy Download. REFER to: Transmission Strategy Download .
	Pump feed seals damaged or leaking	REMOVE the main control valve body and INSPECT the pump feed seals for damage or leaks. INSTALL new seals. REFER to: Main Control Valve Body .
	TCC apply regulator valve sticking	DISASSEMBLE, CLEAN and INSPECT the TCC apply regulator valve. If the bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	TCC charge control valve sticking	DISASSEMBLE, CLEAN and INSPECT the TCC charge control valve. If the bore or valve is damaged, INSTALL a new main control valve body. REFER to: Main Control Valve Body .
	NDX, SP, TCCZ, CAPY, CRLZ hydraulic circuit blocked or leaking	DISASSEMBLE and INSPECT the main control valve body and separator plate passages for debris/blockage. CLEAN as necessary. REFER to: Main Control Valve Body .
	TCC friction material worn or damaged	INSTALL a new torque converter. REFER to: Transmission . REFER to: Transmission .