GM Service Manual Online
For 1990-2009 cars only

Second and Third Gear Only

Checks

Cause

1-2 Shift Solenoid OFF Failure

    • Insufficient force of the solenoid
    • Foreign material is plugging the filter
    • The PCM is not grounding
    • Failure of the O-ring
    • No supply voltage to the 1-2 Shift Solenoid
    • Wires are not connected to the solenoid