P0670 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0670 – Glow Plug Control Module Circuit Fault


P0670: DIY Repairing Video Tutorial


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P0670 Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light),Lack/Loss of Power,The engine may be harder to start,Engine hesitation  

P0670 Possible Causes

  Faulty Glow Plug Control Module (GPCM),GPCM harness is open or shorted,GPCM circuit poor electrical connection,Faulty Engine Control Module (ECM)  

P0670 Description

  The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The engine control module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, the ECM sets the OBDII code.