P0741
DTC P0741
Circuit Description
The transmission control module (TCM) controls the torque converter clutch (TCC) solenoid valve pulse width modulation (PWM). The solenoid directs the hydraulic fluid for TCC apply and release. When the TCC is applied, the engine is coupled directly to the transmission through the TCC. The TCC slip speed should be near 0.
If the TCM detects high torque converter slip when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0741 Torque Converter Clutch (TCC) System - Stuck Off
Conditions for Running the DTC
* No throttle system DTC P0120.
* No ISS DTCs P0716 or P0717.
* No OSS DTCs P0722 or P0723.
* No TCC performance DTC P0742.
* No IMS DTCs P1815, P1820, P1822, P1823, P1825 or P1826.
* No engine torque signal circuit DTC P2637.
* No TCC solenoid electrical DTCs P2764 or P2763.
* The engine run time is greater than 5 seconds.
* The IMS range is D2, D3, D4, or D5.
* The elapsed time since the most recent range change is greater than 6 seconds.
* The transmission fluid temperature is 20-130°C (68-266°F).
* The engine torque is greater than 55 N.m (41 lb ft).
* The throttle position is 10-90 percent.
* The gear ratio is within the following ranges:
- 1.56:1 to 1.64:1 - 3rd gear
- 0.98:1 to 1.03:1 - 4th gear
- 0.73:1 to 0.77:1 - 5th gear
* The TCC apply pressure is greater than 200 kPa (22 psi) for more than 2 seconds.
* The TCC duty cycle is greater than 80 percent for more than 2 seconds.
Conditions for Setting the DTC
The TCM commands the TCC ON, and the TCC slip is between 150-250 RPM for greater than 8 seconds.
Action Taken When the DTC Sets
* The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive drive trip in which the Conditions for Setting the DTC are met.
* The TCM inhibits 5th gear if the transmission is in Hot Mode.
* The TCM commands TCC OFF.
* The TCM freezes transmission adaptive functions.
* At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
* At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
* The TCM stores DTC P0741 in TCM history.
Conditions for Clearing the DTC
* The ECM turns OFF the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request.
* A scan tool can clear the DTC.
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.
* The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.
Diagnostic Aids
Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step inspects the transmission fluid to ensure that it is at the proper level.
3. This step verifies that the TCC engages when commanded ON by the scan tool.
