P008D code meaning
Fuel Cooler Pump Control Circuit Low
Powertrain system Generic code P00xx codes Check engine light
What P008D means
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.
P008D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P008D
- Check engine light on
- Often no further symptoms
- Reduced power when fuel gets hot possible
Common causes of P008D
- Most likelyConnector or wiring faulty
- Most likelyFuel cooler pump faulty
- PossibleRelay or fuse faulty
- Less likelyOutput driver in the engine control module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel cooler pumpFuel cooler pump relayFuel cooler pump wiring
What each part of P008D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 8D | The exact fault in that area. |
What to do next
- Note P008D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P008D
What does P008D mean?
P008D means "Fuel Cooler Pump Control Circuit Low". On some common-rail diesels, fuel returning from the injection system is cooled in a heat exchanger connected to a low-temperature coolant circuit. It is a generic code, so it means the same on every make.
Is it safe to drive with P008D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P008D fail an emissions test?
Yes, it can. P008D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P008D to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P008D clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.