Symptoms

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

Possible Causes

- Faulty shift solenoid D valve - Shift solenoid D valve harness or connectors - Shift solenoid D valve circuit is open or shorted - Low transmission fluid level - Dirty transmission fluid

When Detected

The P0768 code is detected when the gear required by the ECM does not match the actual gear when vehicle is driven.

Description

Shift solenoid valve D 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.