P0742 CHEVROLET - Torque Converter Clutch Circuit Stuck On
Tech notesWhen the a transmission solenoid is stuck on, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.
There is a factory service bulletin for the following Chevrolet Models:
2001 Chevrolet Lumina
2001-2005 Chevrolet Venture, Venture EXT, Venture 4WD
2001-2007 Chevrolet Monte Carlo
2001-2008 Chevrolet Impala, Lumina (Export Only)
2005-2008 Chevrolet Uplander, Uplander EXT, Uplander 4WD
Chevrolet Factory Service Bulletin P0742 OBDII Code
When is the code detected?When the Powertrain Control Module (PCM) no longer provides a ground path, the Torque Converter Clutch (TCC) solenoid valve de-energizes and apply fluid exhausts, releasing the TCC.
When the PCM detects low torque converter slip when the PCM commands the TCC OFF, then is sets the P0742 code.