OBD-II code · Powertrain (generic)
P06BC Cylinder 4 Glow Plug Circuit Range or Performance
The glow plug on cylinder 4 is electrically intact yet does not heat to the calibrated temperature in the expected time - aged element, increased contact resistance, or a partially corroded ground.
Is it safe to drive with P06BC?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPlug element aged
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 4
Related codes
- P06B9Cylinder 1 Glow Plug Circuit Range or Performance
- P06BACylinder 2 Glow Plug Circuit Range or Performance
- P06BBCylinder 3 Glow Plug Circuit Range or Performance
- P06BDCylinder 5 Glow Plug Circuit Range or Performance
- P06BECylinder 6 Glow Plug Circuit Range or Performance
- P06BFCylinder 7 Glow Plug Circuit Range or Performance
- P06C0Cylinder 8 Glow Plug Circuit Range or Performance
- P06C1Cylinder 9 Glow Plug Circuit Range or Performance
- P06C2Cylinder 10 Glow Plug Circuit Range or Performance
- P06C3Cylinder 11 Glow Plug Circuit Range or Performance
- P06C4Cylinder 12 Glow Plug Circuit Range or Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.