P067C
Cylinder 5 Glow Plug Control Circuit Low
Glow plug / diesel preheat
Generic OBD-II
High
What it means
P067C is a diesel code meaning the control circuit that drives the cylinder 5 glow plug is reading low, typically shorted to ground. Glow plugs preheat the cylinder for cold starting, so this usually shows up as harder cold starts and rough cold running rather than a no-start.
High
Can I keep driving? Usually drivable once warm, but expect hard cold starts and rough cold running until the glow-plug circuit is fixed.
Common symptoms
What you'll notice
- Hard starting in cold weather
- Rough idle or hesitation until the engine warms up
- White or excess exhaust smoke on a cold start
- Glow-plug or check-engine light on
Common causes
Most likely first
- Short to ground in the cylinder-5 glow-plug control circuitLikely
- Failed or shorted glow plug on cylinder 5Common
- Damaged wiring or connector at the glow plugCommon
- Faulty glow-plug control moduleLess often
How to diagnose & fix
Work through it in order
- Scan and confirm cylinder 5; note any companion glow-plug codes.
- Inspect the cylinder-5 glow-plug wiring for a short to ground or chafing against the engine.
- Measure the glow plug's resistance and compare it to the others.
- Test the glow-plug control-module driver; replace the plug or repair the wiring, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P067C?+
In mild weather usually yes, but cold starts will be hard and the engine rough until it warms. Repair it before cold weather.
Can I just clear P067C?+
It returns after the next cold start unless the short-to-ground or failed plug is repaired.
Related codes
Often seen with P067C
Read & clear P067C 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