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.