P008DFuel Cooler Pump Control Circuit Low
- 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
- On some common-rail diesels, fuel returning from the injection system is cooled in a heat exchanger connected to a low-temperature coolant circuit. An electric coolant pump, switched by the engine control module depending on fuel temperature, drives this circuit. P008D reports too low a voltage, typically a short to ground of this pump or its relay. If the pump fails for long, the fuel runs hotter; some systems then limit power to protect components.
- What you may notice
- Check engine light on
- Often no further symptoms
- Reduced power when fuel gets hot possible
- Likely causes
- LikelyConnector or wiring faulty
- LikelyFuel cooler pump faulty
- PossibleRelay or fuse faulty
- RareOutput driver in the engine control module faulty
- 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: €100 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.