GM Service Manual Online
For 1990-2009 cars only

First and Second Gears Only

Checks

Causes

2-3 Shift Solenoid Valve (305)

    â€¢ Stuck in OFF
    â€¢ Leaking solenoid
    â€¢ Electrical malfunction

2-3 Shift Valve (307)

Stuck in downshifted position

Direct Clutch

Failed clutch (released)

Pressure Control Solenoid (312)

Actual line pressure is lower than desired line pressure.