P069C
Cylinder 10 Glow Plug Control Circuit Low
The control line for the glow plug on cylinder 10 is shorted to ground or the plug is internally shorted.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
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.
- Control line shorted to groundCommon
- Connector pins corroded - high contact resistanceLess likely
- Harness chafing through insulationLess likely
Parts involved
- Glow Plug Cyl 10
P069C 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.