P0766 Shift Solenoid Valve D Stuck Off
Possible causes
– Low transmission fluid level
– Dirty transmission fluid
– Faulty shift solenoid ‘D’ valve
– Shift solenoid ‘D’ valve harness or connectors
– Shift solenoid ‘D’ valve circuit is open or shorted
– Dirty transmission fluid
– Faulty shift solenoid ‘D’ valve
– Shift solenoid ‘D’ valve harness or connectors
– Shift solenoid ‘D’ valve circuit is open or shorted
What about the obd code?
The P0766 code is detected when the ECM has detected a mechanical fault with the solenoid energized, valve stuck off
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission will not shift gears
– Transmission will not shift gears
P0766 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.