Possible causes

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

When is the code detected?

The P0785 code is detected when the PCM detects a continuous open, short to ground or short to power in the 3-2 SS valve assembly circuit

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission may not shift to the next gear

P0785 ISUZU Description

The 3-2 Shift Solenoid valve assembly is a normally-closed, and the controls the 3-2 downshift. The Powertrain Control Module (PCM) controls the solenoid by providing a ground path. During a 3-2 downshift, the 2-4 band applies as the 3-4 clutch releases. The PCM varies the timing between the 3-4 clutch release and the 2-4 band apply depending on the vehicle speed and the throttle position.