GM Service Manual Online
For 1990-2009 cars only

Incorrect TCC Apply or Release

Checks

Cause

AT Output (Shaft) Speed Sensor Assembly (22)

    â€¢ Poor connection
    â€¢ Pinched wire
    â€¢ A broken coil wire
    â€¢ Incorrect air gap
    â€¢ Inadequate signal

Throttle Position Sensor

    â€¢ Poor connection
    â€¢ Pinched wire
    â€¢ Incorrect resistance

VCM/PCM

Failed

Automatic Transmission Fluid Pressure Manual Valve Position Switch (40)

    â€¢ Poor Connection
    â€¢ No signal to the VCM/PCM
    â€¢ Pinched wire

AT Fluid Temperature Sensor Assembly (332)

    â€¢ Poor Connection
    â€¢ No signal to the VCM/PCM
    â€¢ Incorrect Resistance
    â€¢ Pinched wire

Engine Coolant

No signal to the VCM/PCM

Brake Switch

    â€¢ Poor connection
    â€¢ Pinched wire
    â€¢ No voltage supply
    â€¢ Misadjusted

Engine Ignition Module

Loss of signal or intermittent

Check the VCM/PCM for current DTCs

Only 2WD

  • Digital Ratio Adapter (DRAC)
    â€¢ Malfunction
    â€¢ Incorrect