P069A
Cylinder 9 Glow Plug Control Circuit Low
Diesel glow plug / preheat
Generic OBD-II
High
What it means
P069A is a diesel-engine code showing a low-voltage (short-to-ground) fault in the control circuit for the cylinder 9 glow plug. Glow plugs preheat the cylinders for easy cold starting, so this fault typically shows up as hard cold starts and rough running until the engine warms. The engine still runs, but the cylinder 9 glow plug circuit needs repair.
High
Can I keep driving? The engine still runs, but on a diesel it may be hard to start and run rough when cold until the cylinder 9 glow plug circuit is repaired.
Common symptoms
What you'll notice
- Hard starting, especially in cold weather
- Check-engine (or glow plug) light on
- Rough running and shudder when the engine is cold
- White or grey smoke from the exhaust on a cold start
Common causes
Most likely first
- Short to ground in the cylinder 9 glow plug control circuitLikely
- Failed glow plug on cylinder 9Common
- Corroded or loose connector at the glow plugCommon
- Glow plug control module fault driving the cylinder 9 output lowLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for glow plug codes on other cylinders.
- Inspect the wiring and connector to the cylinder 9 glow plug for a short to ground.
- Measure the resistance of the cylinder 9 glow plug and compare to the others.
- Repair the control circuit or replace the glow plug, then clear and re-test on a cold start.
FAQ
Quick answers
Is it safe to drive with P069A?+
Yes once running, but cold starts get harder and the engine runs rough until warm, so repair it soon.
Can I just clear P069A?+
It will return until the cylinder 9 glow plug control circuit fault is repaired.
Related codes
Often seen with P069A
Read & clear P069A 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