GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: TCC Lock-up clutch does not engage

    • Torque converter clutch solenoid valve inoperative
    • TCC lock-up pressure control solenoid inoperative
    • Input speed sensor inoperative
    • Output shaft speed sensor inoperative
    • TCC lock-up clutch piston inoperative
    • Torque converter check valve inoperative
    • TCC lock-up shift valve inoperative
    • TCC lock-up control valve inoperative
    • Inspect the MIL indicator for loose connectors.
    • Inspect the TCC lock-up pressure control solenoid body gasket for wear and damage.
    • If the TCC lock-up pressure control solenoid is stuck, inspect the CPC valves.