GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Torque Converter Assembly (28)

    • Inspect for damaged Torque Converter Clutch Seal (inside converter assembly)
    • Diagnose Torque Converter Assembly for possible internal damage

Valve Body Assembly (433)

Inspect for worn, damaged or sticking TCC Regulator Apply (425) and TCC Regulator Apply Shuttle (426) Valves

Oil Pump Assembly (201)

Inspect for worn or damaged Torque Converter Fluid Seal Assembly (301)