Possible causes

– Low transmission fluid level
– Dirty transmission fluid
– Faulty 4C shift solenoid valve
– 4C Shift solenoid valve harness is open or shorted
– 4C Shift solenoid valve circuit poor electrical connection

When is the code detected?

The P0770 code is detected when the TCM has detected an electrical fault in the 4C Shift Solenoid-This is an electrical fault, not a transmission mechanical fault

Symptoms

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

P0770 JEEP Description

4C 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.