P06C5
Cylinder 1 Glow Plug Incorrect
The glow plug on cylinder 1 reports an electrical resistance or response curve that does not match the calibrated plug type. Typical after fitting a wrong replacement plug.
- 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.
- Replacement plug of wrong typeCommon
Parts involved
- Glow Plug Cyl 1
P06C5 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.