Powertrain
generic / SAE
P0670
Glow Plug Module Control Circuit
The control circuit between the engine controller and the glow plug control module reports a fault. The ECU can no longer reliably command the module that drives the glow plugs, so cold-start pre-heating may not run. On a diesel this causes hard starting, white smoke, and rough running until warm. Causes: open or shorted wiring between ECU and glow plug module, a failed module, or a power/ground fault at the module.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 70
Possible causes
- Glow plug control module faulty high
- Wiring or connector fault medium
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–700 €
- Estimated time: 0.5–2.5 h
- Component: glow plug module
- Component: module wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012