Possible causes

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

Tech notes

There is a factory service bulletin for the following Jeep models:

2003-2005 Jeep Wrangler
2003-2005 Jeep Liberty
2003-2005 Jeep Cherokee
Jeep Factory Service Bulletin OBDII Code P0765

When is the code detected?

The P0765 code is detected when the ECM detects an improper voltage drop when it tries to operate the solenoid valve.

Symptoms

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

P0765 JEEP Description

Underdrive (UD) clutch 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.

JEEP Technical Service Bulletins for P0765 code