P008D: Fuel Cooler Pump Control Circuit Low
Standardized SAE J2012 code · P00xx — Fuel & air metering and auxiliary emission controls
What does P008D mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light on
- Often no further symptoms
- Reduced power when fuel gets hot possible
Common causes
- High Connector or wiring faulty
- High Fuel cooler pump faulty
- Medium Relay or fuse faulty
- Low Output driver in the engine control module faulty
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P008D on the same make and model first.
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