Possible causes

– Low transmission fluid level
– Dirty transmission fluid
– Faulty Reduction Solenoid valve
– Reduction Solenoid valve harness is open or shorted
– Reduction Solenoid valve circuit poor electrical connection

When is the code detected?

The P0773 code is detected when the gear required by the ECM does not match the actual gear when vehicle is driven.

Symptoms

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

P0773 MITSUBISHI Description

Reduction 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.