P0675
Cylinder 5 Glow Plug Circuit/Open
Glow plug / diesel preheat
Generic OBD-II
High
What it means
P0675 is a diesel code meaning the control module detected an open (broken) circuit for cylinder 5's glow plug — most often a burned-out plug or broken wiring. Glow plugs preheat the cylinder for starting, so the main symptoms are hard cold starts and rough, smoky running until the engine reaches temperature.
High
Can I keep driving? Usually drivable — expect hard cold starts and rough, smoky running until warm; a single open glow plug rarely stops the engine from starting.
Common symptoms
What you'll notice
- Difficulty starting, especially in cold weather
- Rough running or a slight misfire until the engine warms up
- White or grey exhaust smoke on cold starts
- Check-engine or glow-plug warning light on
Common causes
Most likely first
- Failed cylinder 5 glow plug (open circuit)Likely
- Open or broken wiring in the cylinder 5 glow plug circuitCommon
- Loose or corroded electrical connectionCommon
- Faulty glow plug control moduleLess often
How to diagnose & fix
Work through it in order
- Scan and confirm the code, and check whether other cylinders have glow-plug codes too.
- Inspect the wiring and connector to the cylinder 5 glow plug for breaks or corrosion.
- Measure the glow plug's resistance; an open (infinite) reading means it has failed and needs replacing.
- If the plug and wiring test good, check the control module's output and feeds. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0675?+
Usually yes, but cold starts will be harder and the engine may run rough and smoky when cold. Repair it before cold weather makes starting worse.
Can I just clear P0675?+
It returns once the module re-tests the circuit. The open plug or wiring needs to be repaired for the code to stay off.
Related codes
Often seen with P0675
Read & clear P0675 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