GM Service Manual Online
For 1990-2009 cars only

Third and Fourth Gear Operation

Checks

Cause

2-3 Shift Solenoid for OFF Failure

    • Foreign material and plugging in the filter
    • Insufficient force of the solenoid
    • 2-3 Shift Solenoid O-ring failure
    • 2-3 Shift Valve stuck in upshift position.
    • An open wire from the shift solenoid to the PCM
    • The PCM is not grounding
    • No supply voltage to the solenoid
    • Wires are not connected to the solenoid