GM Service Manual Online
For 1990-2009 cars only

Checks

Cause

Gasket (6)

Damaged

TCC Shift Solenoid Valve (323)

    • Stuck On
    • Pinched wire to ground

TCC Apply Valve (324)

Stuck

PCM

Failed

Check PCM for current DTCs

Refer to Incorrect Torque Converter Clutch Apply or Release .