GM Service Manual Online
For 1990-2009 cars only

Second and Third Gear Only

Checks

Cause

1-2 Solenoid (313) - Check for DTCs

    â€¢ Stuck Off
    â€¢ Loose connector
    â€¢ No voltage to the solenoid
    â€¢ Solenoid O-ring failure
    â€¢ No PCM signal to the solenoid

1-2 Shift Valve (314)

Stuck

Quad Driver Module

Failed

Check the VCM/PCM for current DTCs