Possible causes

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

When is the code detected?

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

P0670 Information for specific makes

P0670 CHRYSLER
P0670 DODGE
P0670 FORD
P0670 GMC
P0670 VOLKSWAGEN