Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

- Engine Light ON (or Service Engine Soon Warning Light) - Transmission will not shift gears.

When Detected

The P0771 code is detected when the ECM has detected a mechanical fault with the solenoid energized, valve stuck off

Description

Torque Converter Clutch (TCC) solenoid valve is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position.