OBD-II code · Powertrain (generic)
P00B9 Low Pressure Fuel System Pressure - Too Low. Low Ambient Temperature
Low-pressure fuel circuit pressure below target under cold ambient conditions. Often diesel waxing or gelled fuel filter.
Is it safe to drive with P00B9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyFuel waxing in cold weather
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Filter, Lift Pump, Low Pressure Sensor
Related codes
- P00B6Radiator Coolant Temperature/Engine Coolant Temperature Correlation
- P00B7Engine Coolant Flow Low/Performance
- P00B8MAP - Mass or Volume Air Flow Correlation Bank 2
- P00BALow Fuel Pressure - Forced Limited Power
- P00BBFuel Injector Insufficient Flow - Forced Limited Power
- P00BCMass or Volume Air Flow A Circuit Range/Performance - Air Flow Too Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.