GM Service Manual Online
For 1990-2009 cars only

Component

Inspect

Electrical

    • 12 volts not supplied to transmission
    • Outside electrical connector damaged
    • Inside electrical connector, wiring harness or solenoid damaged
    • Electrical short (pinched solenoid wire)
    • Solenoid not grounded

Torque Converter Clutch

Internal damage

Oil Pump Assembly

    • Converter clutch valve stuck or assembled backwards
    • Converter clutch valve retaining ring incorrectly assembled
    • Pump to case gasket incorrectly positioned
    • Orifice cup plug restricted or damaged
    • Solenoid O-ring seal cut or damaged
    • High or uneven bolt torque (pump body to cover)

Input Housing and Shaft

    • Turbine shaft O-ring seal cut or damaged
    • Incorrect O-ring fitted (e.g. 300 mm torque converter O-ring on 258 mm converter)
    • Turbine shaft retainer and ball assembly restricted or damaged

Transmission Fluid Pressure

Manual Valve Position Switch

    • Contamination
    • Damaged seals

Control Valve Body Assembly

    • TCC signal valve stuck
    • Solenoid O-ring leaking

Solenoid Screen

Blocked

TCC Solenoid Valve

Internal damage

Engine Speed Sensor

Internal damage

Engine Coolant Temperature Sensor

Internal damage

Automatic Transmission fluid Temperature Sensor

Internal damage

Brake Switch

Internal damage