P008BLow Pressure Fuel System Pressure - Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some engines, mainly gasoline direct injection with a demand-controlled in-tank pump, have their own pressure sensor in the low-pressure line between the tank pump and the high-pressure pump. The engine control module compares this supply pressure with its target. P008B is set when the supply pressure stays too high. Manufacturer bulletins name a faulty low-pressure sensor as the most common cause, for example from fuel entering the sensor and falsifying its signal; a mechanical gauge test clarifies whether the pressure is really too high.
- What you may notice
- Check engine light on
- Often no drivability symptoms
- Likely causes
- LikelyLow-pressure sensor faulty
- PossiblePump control unit or software
- RareReturn line or regulator blocked
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.