P06C2
Cylinder 10 Glow Plug Circuit Range/Performance
Glow plug / diesel preheat
Generic OBD-II
Medium
What it means
P06C2 means the diesel engine's computer sees the cylinder 10 glow plug circuit performing outside its expected range — the plug is drawing the wrong current or heating incorrectly. Glow plugs preheat the cylinders for starting, so this mainly degrades cold-start quality rather than stopping the engine from running once it is warm.
Medium
Can I keep driving? Usually yes — the engine runs, but cold starts may be harder, rougher, or smokier until the cylinder 10 glow plug is checked.
Common symptoms
What you'll notice
- Hard starting in cold weather
- Glow plug or check-engine light on
- Rough running and white smoke on a cold start
- Reduced performance until the engine warms up
Common causes
Most likely first
- Aged or weak cylinder 10 glow plug drawing out-of-range currentLikely
- High-resistance wiring or connector on the glow plug circuitCommon
- Corroded or loose glow plug connectionCommon
- Faulty glow plug control moduleLess often
How to diagnose & fix
Work through it in order
- Scan and confirm P06C2, then check for other glow plug codes.
- Measure the cylinder 10 glow plug resistance and compare it with the other plugs.
- Inspect the wiring and connector for high resistance or corrosion.
- Replace the out-of-spec glow plug; glow plugs are often replaced as a set.
- If plugs and wiring are good, test the glow plug control module.
FAQ
Quick answers
Is it safe to drive with P06C2?+
Usually — the engine runs on its other cylinders, but cold-start quality drops. Fix it before winter.
Can I just clear P06C2?+
It returns after the next glow-plug self-test unless the weak plug or wiring is addressed.
Related codes
Often seen with P06C2
Read & clear P06C2 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX