P0839 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0839 – Four Wheel Drive Switch Circuit High

 

P0839 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P0839 Possible Causes

 

Faulty Four Wheel Drive Switch,Four Wheel Drive Switch harness is open or shorted,Four Wheel Drive Switch circuit poor electrical connection

 

P0839 Description

 

The Transmission Control Module (TCM) monitors the Four Wheel Drive Switch Circuit signal. the TCM sets the OBDII code when the Four Wheel Drive Switch Circuit is not to factory specifications.