OBD-II code · Powertrain (generic)
P0679 Cylinder 9 Glow Plug Circuit Open
The glow plug circuit on cylinder 9 is open - usually a broken connection or burnt-out heater element.
Is it safe to drive with P0679?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPlug element burnt out
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.4 h
- Emissions test
- Likely to fail
- Parts involved
- Glow Plug Cyl 9
Related codes
- P0680Cylinder 10 Glow Plug Circuit Open
- P0681Cylinder 11 Glow Plug Circuit Open
- P0682Cylinder 12 Glow Plug Circuit Open
- P0676Cylinder 6 Glow Plug Circuit
- P0677Cylinder 7 Glow Plug Circuit
- P0678Cylinder 8 Glow Plug Circuit
- P067ACylinder 4 Glow Plug Control Circuit Low
- P067BCylinder 4 Glow Plug Control Circuit High
- P067CCylinder 5 Glow Plug Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.