P279D Code: Meaning, Causes, and Symptoms | OBD2 Codes

P279D – Four Wheel Drive Range Signal Circuit

 

P279D Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P279D Possible Causes

 

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

 

P279D Description

 

The Transmission Control Module (TCM) monitors the Four Wheel Drive Range Signal Circuit signal. the TCM sets the OBDII code when the Four Wheel Drive Range Signal Circuit signal is out of the factory specifications.