P0742

Diagnostic Chart:

Circuit Description

The Torque Converter Clutch Solenoid Valve (TCC Sol. Valve) acts on the hydraulic fluid, controlling TCC apply and release.

If the PCM detects 3 occurrences of TCC slip between -20 and +30 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) DTCs P0502 or P0503.

^ No TCC PWM Solenoid Electrical DTC P1860.

^ No TCC Enable Solenoid Electrical DTC P0740.

^ Not in fuel shut off.

^ The engine speed is more than 500 RPM for 5 seconds.

^ 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 14-50%.

^ The engine torque is 109-271 N.m (70-200 ft lbs.).

^ No gear change within 3 seconds.

^ The vehicle speed is 32-113 km/h (20 - 70 mph).

^ The engine speed is 800-4000 RPM.

^ The TCC slip speed is -20 to +25 RPM, 3 occurrences for 5 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 clears 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. P0705