P0670 Glow Plug Control Module Circuit Fault

Possible causes

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

What about the obd code?

The Engine Control Module (ECM) has detected a fault on the Glow Plug Control Module (GPCM) control circuit

Symptoms

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