Incorrect Torque Converter Clutch (TCC) Apply or Release

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Cause
AT Output Shaft Speed Sensor Assembly (22)	Poor connection Pinched wire A broken coil wire Incorrect air gap Inadequate signal
Throttle Position Sensor	Poor connection Pinched wire Incorrect resistance
PCM	Failed
Automatic Transmission Fluid Pressure Manual Valve Position Switch (40)	Poor connection No signal to the PCM Pinched wire
AT Fluid Temperature Sensor Assembly (332)	Poor connection No signal to the PCM Incorrect resistance Pinched wire
Engine Coolant	No signal to the PCM
Brake Switch	Poor connection Pinched wire No voltage supply Misadjusted
Engine Ignition Module	Loss of signal or intermittent
Check the PCM for current DTCs.
Only 2WD