P0741

P0741 - TCC SYSTEM STUCK OFF





The Torque Converter Clutch (TCC) solenoid is a pulse width modulated solenoid. When vehicle operating conditions are met for TCC application, the PCM/TCM begins the duty cycle at approximately 42%. The PCM/TCM then increases the duty cycle up to 90% in order to achieve full TCC apply. When the TCC solenoid is de-energized, the solenoid blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized, the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized, modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid exhaust. When the PCM/TCM detects a high TCC slip speed with the TCC solenoid commanded On, then DTC P0741 sets.

DTC PARAMETERS
- Engine is running
- TP angle is greater than 8%
- TFT is between 21° C (70° F) and 130° C (266° F)
- Engine torque greater than 10 ft. lbs.
- Commanded gear greater than 1st
- No engine torque default
- Time since last manual range change greater than 6 seconds
- No ISS, OSS, TCC release switch, TCC electrical, TCC stuck ON, TFP or TP sensor DTCs have been set
P0741 is a (type B) DTC.

DIAGNOSTIC AIDS
Inspect and repair as necessary:
- TCC solenoid O-ring for leaks or cut
- TCC solenoid filter plugged
- TCC control valve stuck in the released position
- TCC regulated apply valve stuck in the released position
- TCC feed limit valve stuck Pressure regulator valve stuck
- TCC fluid circuit leaks Turbine shaft seals for leaks or cut
- Torque converter for ballooning