Fuel Cooler Pump Control Circuit/Open
What it means
P008C means the control circuit for the fuel cooler pump is open, so the engine computer can't drive the pump. On engines fitted with one (commonly some diesels and returnless fuel systems), this pump circulates fuel through a cooler to keep fuel temperature down. With the circuit open the fuel isn't actively cooled, which can matter most on hot days or under heavy load. The engine generally still runs, but fuel-temperature control is lost until the wiring or pump is repaired.
Can I keep driving? Usually still drivable, but fuel can run hotter than intended; on a hot day or under heavy load this may bring reduced power or a fuel-temperature warning, so address it before long trips.
Common symptoms
What you'll notice
- Check-engine light on
- Possible high fuel-temperature code or warning
- Reduced power on hot days or under heavy load (on some vehicles)
Common causes
Most likely first
- Open in the fuel cooler pump control circuit wiring or connectorLikely
- Faulty fuel cooler pumpCommon
- Loose or corroded connections at the pump or ECMCommon
- Blown fuse or relay feeding the pumpLess often
- Failed ECM driver (rare)Less often
How to diagnose & fix
Work through it in order
- Confirm the code and inspect the fuel cooler pump connector and wiring for an open.
- Check the pump's fuse, relay, power, and ground.
- Command the pump with a scan tool and confirm whether it runs.
- Replace the fuel cooler pump if it's open or seized.
- Repair wiring, clear the code, and retest.
FAQ
Quick answers
Is it safe to drive with P008C?+
Can I just clear P008C?+
Related codes
Often seen with P008C
Read & clear P008C yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.