P138A Code: Meaning, Causes, and Symptoms | OBD2 Codes
P138A – Glow Plug Control Module Control Circuit Range/Performance
P138A Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
P138A Possible Causes
Faulty Glow Plug Control Module,Glow Plug Control Module harness is open or shorted,Glow Plug Control Module circuit poor electrical connection
P138A Description
The Engine Control Module (ECM) monitors the Glow Plug Control Module. The ECM sets the OBDII code when Glow Plug Control Module is not working properly.