Diagnostic Instructions
DTC Descriptors
DTC P0741: Torque Converter Clutch (TCC) - Stuck Off
DTC P0742: Torque Converter Clutch (TCC) - Stuck On
Circuit/System Description
The torque converter clutch (TCC) pressure control (PC) solenoid is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The shift solenoid (SS) 1 supplies transmission fluid to the TCC PC
solenoid when commanded OFF. The TCC PC solenoid regulates transmission fluid through the TCC regulator valve in the lower valve body and the TCC control valve in the pump, to the TCC when commanded ON and exhausts fluid when commanded OFF. When the TCC
is applied, the engine is coupled directly to the transmission.
Conditions for Running the DTC
| • | No DTCs P0716 or P0717. |
| • | No DTCs P0722 or P0723. |
| • | No DTCs P2762, P2763, or P2764. |
| • | No DTCs P0741 or P0742. |
| • | The engine run time is greater than 5 seconds. |
| • | The transmission fluid temperature (TFT) is 20-130°C (68-266°F). |
| • | The calculated throttle position is between 8-90 percent. |
| • | The engine torque is greater than 50 N·m (36 lb ft). |
| • | The 2nd gear ratio is between 1.42-1.63. |
| • | The 4th gear ratio is between 1.06-1.23. |
| • | The 5th gear is between 0.79-0.90. |
| • | The 6th gear is between 0.62-0.71. |
| • | The TCC is commanded ON and PWM duty cycle is greater than 60 percent for 5 seconds. |
Conditions for Setting the DTC
P0741
The TCM detects TCC slip greater than 125 RPM for 5 seconds when the TCC is commanded ON. This must occur 4 times.
P0742
The TCM detects the TCC slip between -20 and 40 RPM for 4 seconds when the TCC is commanded OFF. This must occur 3 times.
Action Taken When the DTC Sets
| • | DTCs P0741 and P0742 are Type B DTCs. |
| • | Inhibit high gear in Hot Mode. |
| • | The TCM freezes transmission adaptive functions. |
Conditions for Clearing the DIC/DTC
DTCs P0741 and P0742 are Type B DTCs.
Diagnostic Aids
When attempting to set transmission performance DTCs, it may be helpful to observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
DTC Type Reference
Electrical Information Reference
Scan Tool Reference
Special Tools Required
DT-47825
Control Solenoid Test Plate
Circuit/System Verification
- Perform the
Transmission Fluid Check
.
- Operate the vehicle in drive with the calculated throttle position greater than 8 percent and ensure TCC is commanded ON and OFF a minimum of 5 times.
| ⇒ | If the DTC resets, go to Component Testing. |
Component Testing
- Perform the
Control Solenoid Valve and Transmission Control Module Assembly Cleaning
in an attempt to clean or free up a potential sticking valve of dirt or debris.
- Perform the
Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test
to test for a stuck open or stuck closed TCC PC solenoid valve inside of the control solenoid (w/body
and TCM) valve assembly.
| ⇒ | If a stuck open or closed valve is found, replace the control solenoid (w/body and TCM) valve assembly. |
- Inspect the lower control valve body for a stuck valve, debris or damage.
| ⇒ | If you found a valve body concern, repair or replace the lower control valve body as necessary. |
- Inspect the TCC control valve in the pump.
| ⇒ | If you found a TCC control valve concern, repair or replace the TCC control valve or pump as necessary. |
- Inspect the torque converter assembly for damage or discoloration.
| ⇒ | If you found a torque converter assembly concern, replace the torque converter assembly as necessary. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
| • | Control solenoid (w/body and TCM) valve assembly replacement: Refer to
Control Module References
for replacement, setup, and programming. |
