P06C3
Cylinder 11 Glow Plug Circuit Range/Performance
Glow plugs (diesel)
Generic OBD-II
High
What it means
P06C3 is a diesel code meaning the cylinder-11 glow plug circuit is performing outside its expected range — usually resistance that is too high or too low for that plug. Glow plugs pre-heat each cylinder for cold starting, so a marginal one on cylinder 11 makes cold starts harder and smokier. It points at that specific glow plug or its wiring rather than the whole engine.
High
Can I keep driving? The engine usually still runs, but the cylinder-11 glow plug is not performing as expected, so cold starts can be harder and smokier until it is fixed.
Common symptoms
What you'll notice
- Check-engine light on (often with a glow-plug warning light)
- Harder starting when cold
- Rough running or a slight miss until the engine warms up
- White exhaust smoke on a cold start
Common causes
Most likely first
- Faulty cylinder-11 glow plug (out-of-range resistance)Likely
- Damaged wiring or a poor connector at the cylinder-11 glow plugCommon
- High resistance from corrosion in the glow-plug circuitCommon
- Faulty glow plug control moduleLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the fault is on the cylinder-11 glow-plug circuit.
- Locate the cylinder-11 glow plug and inspect its connector and wiring for corrosion, damage, or high resistance.
- Measure the glow plug's resistance and compare it to the others; replace it if it reads out of spec.
- If the plug and wiring are good, test the glow plug control module output for that cylinder and replace the module if it is at fault.
FAQ
Quick answers
Is it safe to drive with P06C3?+
Usually yes once running, but one weak glow plug makes cold starts harder and dirtier. Repair it before cold weather.
Can I just clear P06C3?+
It clears, but returns once the circuit faults again. The cylinder-11 glow plug or its wiring needs to be checked.
Related codes
Often seen with P06C3
Read & clear P06C3 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