GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Fluid Pump Assembly (201)

    • Inspect for loose Fluid Pump Bolts (204)
    • Inspect for leaking or damaged Fluid Pump Outlet Seals (24) and Oil Filter Seal
    • Inspect for improperly installed, restricted or damaged Oil Filter (203)
    • Inspect for sticking Line Pressure Blow Off Valve (304)
    • Inspect for worn, sticking or damaged Pressure Regulator Valve (309) or Pressure Regulator Valve Spring (308)
    • Inspect for damaged or restricted oil ports in the Oil Pump Body (303)

Torque Converter Housing (208)

    • Inspect for missing or restricted Differential Lube Oil Circuit Orifice
    • Inspect for missing Front differential Carrier Baffle (205)

Control Solenoid Valve Assembly (w/Body and TCM) (7)

Inspect for leaking or damaged Filter Plate Assembly Seals (8)

Case Assembly (50)

    • Inspect for proper fluid level
    • Inspect for missing Lube Oil Circuit Orifice or Front Differential Carrier Baffle (62)
    • Inspect for leaking or damaged Valve Body Spacer Plate Assembly (12)
    • Inspect for damaged or leaking Fluid Check Valve (55)
    • Inspect for leaking, damaged or broken Fluid Level Control Valve (13)

Torque Converter Assembly (28)

    • Inspect for damaged Torque Converter Clutch Seal (inside converter assembly)
    • Inspect for damaged or disengaged Torque Converter hub to Oil Pump Drive Gear