P0742

DTC P0742 TCC Stuck On:

Torque Converter Clutch (TCC):

Circuit Description

The Torque Converter Clutch Solenoid Valve (TCC So Valve) acts on the hydraulic fluid, controlling TCC apply and release. When the PCM detects 3 occurrences of TCC slip between -20 and +50 RPM when the TCC is commanded OFF, then DTC P0742 sets. DTC P0742 is a type B DTC.

Conditions for Setting the DTC

^ No Throttle Position (TP) DTCs P0122 or P0123

^ No Vehicle Speed Sensor (VSS) DTC P0502

^ No TCC Pulse Width Modulation (PWM) solenoid electrical DTC P1860

^ No TCC enable solenoid electrical DTC P1864

^ The engine has been running for 5 seconds.

^ Not in fuel shut off

^ The engine speed is more than 500 RPM.

^ The PCM has commanded the TCC OFF.

^ The commanded gear is not 1st.

^ The transmission gear indicates 2nd, 3rd or 4th.

^ The throttle angle is more than 18%.

^ The engine torque is 110-130N.m (80-170 ft lbs.).

^ The Manifold Absolute Pressure (MAP) is between 0 and 105 kPa (0-15 psia).

^ The TCC slip speed is -20 to +50 RPM, 3 occurrences for S seconds.

Action Taken When the DTC Sets

The PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive trips with a failure reported.


Conditions for Clearing the DTC

^ The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.

^ A scan tool can clear the DTC from the PCM history. The PCM dears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.


Diagnostic Aids

^ Check for PRNDL DTC P0705. DTC P0705 affects transmission operation. This may set DTC P0742 falsely.

^ Inspect the transmission fluid for debris.


Test Description

The step number below refers to the step numbers on the diagnostic table.

2. A TCC slip speed of -20 to +30 RPM indicates that this DTC is not current. Refer to the Diagnostic Aids. Inspect for PRNDL DTC P0705.