Symptoms

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

Possible Causes

- Faulty 2-3 shift solenoid valve - 2-3 shift solenoid valve harness or connectors - 2-3 shift solenoid valve circuit is open or shorted - Low transmission fluid level - Dirty transmission fluid

When Detected

The TCM has detected voltage on the 2-3 shift solenoid during a period when the solenoid is not active

Description

2-3 shift 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.