GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

1-2 Shift Solenoid Valve

    • Inoperative
    • Debris
    • Pinched wires

3-4 Shift Valve Bore Plug

Misassembled

4th Band

Burned, slipping, missing

4th Servo Cover

Cracked

4th Servo Pin

Broken, seized

4th Servo Piston

Damaged

4th Servo Seals

Rolled, cut or damaged