P008CFuel Cooler Pump Control Circuit/Open
- 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. P008C reports an open control circuit 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.