[amidgeha]

Shift Solenoid (A)

Shift solenoid valve A 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.

Cause:
Low transmission fluid level
Dirty transmission fluid
Faulty shift solenoid "A" valve
Shift solenoid "A" valve harness or connectors
Shift solenoid "A" valve circuit is open or shorted

Symptoms:
Check engine light
Transmission will not shift gears.