OBD-II code · Powertrain (generic)
P06F8 Glow Plug Control Module 2 Control Circuit High
Same as P06F6 with the control line shorted to supply. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P06F8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.8 h
- Emissions test
- Likely to fail
- Parts involved
- Glow Plug Control Module 2
Related codes
- P0384Glow Plug Control Module 1 Control Circuit High
- P06F5Glow Plug Control Module 2
- P06F6Glow Plug Control Module 2 Control Circuit Open
- P06F7Glow Plug Control Module 2 Control Circuit Low
- P06F9Glow Plug Control Module 2 System Voltage
- P06FAGlow Plug Control Module 2 Performance
- P06FBGlow Plug Control Module 2 Memory Checksum Error
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.