P2363
Glow Plug Module Control Module Power Circuit High
The voltage at the glow plug control module supply line is above the upper threshold. Indicates wiring or charging-system overvoltage condition.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: 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
Common causes
Ordered by how often each turns out to be the cause.
- Charging system overvoltagePossible
- Wiring shorted to batteryPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Glow Plug Control Module
- Alternator
P2363 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.