Powertrain
generic / SAE
P0383
Glow Plug Control Module 1 Control Circuit Low
The drive line from the PCM to glow plug control module 1 is stuck low — short to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / 83
Possible causes
- Short to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
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: 80–600 €
- Estimated time: 0.5–2.5 h
- Component: glow plug control module
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012