GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Control Valve Upper Body Assembly (304)

    • Inspect for worn, damaged, or sticking 3-5 reverse regulator valve (336) and valve spring (326).
    • Inspect for damaged or missing #5 checkball.

Control Valve Lower Body Assembly (307)

Inspect for worn, damaged, or sticking clutch select solenoid valve 3 (352) and valve spring (353).