P069D
Cylinder 10 Glow Plug Control Circuit High
Glow plugs (diesel)
Generic OBD-II
High
What it means
P069D means the engine computer has detected a high-voltage or open condition in the control circuit for the cylinder 10 glow plug on a diesel engine. Glow plugs preheat the combustion chamber for cold starting, so a fault here typically causes hard cold starts, rough running until the engine warms, and white exhaust smoke.
High
Can I keep driving? Usually driveable in mild weather, but expect hard cold starts and rough cold-running until the glow plug circuit is repaired.
Common symptoms
What you'll notice
- Hard starting, especially in cold weather
- Rough running or a stumble right after a cold start
- White or blue exhaust smoke on a cold start
- Check-engine light (and often the wait-to-start/glow-plug light) on
Common causes
Most likely first
- Failed cylinder 10 glow plug (open element)Likely
- Open circuit or short to voltage in the cylinder 10 glow plug control wiringCommon
- Corroded or loose connector at the glow plug or glow-plug control moduleCommon
- Faulty glow plug control moduleLess often
- Faulty ECM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the fault is on cylinder 10 specifically.
- Measure the cylinder 10 glow plug resistance and replace it if it is open or out of spec.
- Inspect the glow plug wiring and connector for open circuits, shorts to voltage, and corrosion.
- Check the glow-plug control module outputs and its connections.
- Clear the code and retest with a cold start; if it returns, evaluate the control module and ECM.
FAQ
Quick answers
Is it safe to drive with P069D?+
In mild weather usually yes, but cold starts will be hard and the engine may run rough until warm. Fix it before winter to avoid a no-start.
Can I just clear P069D?+
You can, but it will return until the failed glow plug or its circuit is repaired.
Related codes
Often seen with P069D
Read & clear P069D 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