OBD-II code · Powertrain (generic)
P06F9 Glow Plug Control Module 2 System Voltage
Glow Plug Control Module 2 System Voltage: the control module has detected this fault condition. This affects diesel cold-start preheating.
Is it safe to drive with P06F9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySupply voltage low
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
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Glow Plug Control Module 2
Related codes
- P052FGlow Plug Control Module 1 System Voltage
- P06F6Glow Plug Control Module 2 Control Circuit Open
- P06F7Glow Plug Control Module 2 Control Circuit Low
- P06F8Glow Plug Control Module 2 Control Circuit High
- P06FAGlow Plug Control Module 2 Performance
- P06FBGlow Plug Control Module 2 Memory Checksum Error
- P06FCGlow Plug Control Module 2 to PCM Communication Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.