Damaged, chafed or broken wiring in the pump control circuit; Corroded, loose or pushed-out pin at the pump connector or control module connector; Faulty fuel cooler pump with an open internal winding; Blown fuse or faulty relay supplying the pump circuit; Poor earth connection on the pump or relay circuit; Fault inside the control module driver circuit; Outdated control module software where the manufacturer has published a fix for false circuit faults.

P008C

Fuel Cooler Pump Control Circuit/Open.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
8C: FaultThe specific fault in that area

What it means

P008C means the powertrain control module has detected an open circuit in the control circuit for the fuel cooler pump. The module commands the pump on and off and monitors the circuit, and it sets the code when the expected electrical response is missing, which points to a break or lost connection. Fuel cooler layouts vary between vehicles, so the exact pump location and circuit design depend on the model and engine.

Symptoms

Engine warning light on
Fuel cooler pump not running or not audible when commanded
Raised fuel temperature or related fuel temperature codes
Reduced power or limp mode on some vehicles
Hot restart difficulty or rough running in hot conditions
No noticeable change in driveability

Possible causes

Damaged, chafed or broken wiring in the pump control circuitlikely
Corroded, loose or pushed-out pin at the pump connector or control module connectorlikely
Faulty fuel cooler pump with an open internal windinglikely
Blown fuse or faulty relay supplying the pump circuitpossible
Poor earth connection on the pump or relay circuitpossible
Fault inside the control module driver circuitrare
Outdated control module software where the manufacturer has published a fix for false circuit faultsrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including fuel and coolant temperatures
Check for related codes such as fuel temperature sensor or pump circuit faults and check for any manufacturer bulletins for the model
Visually inspect the pump wiring, connectors and harness routing for damage, heat, corrosion or water ingress
Check the fuse and relay for the pump circuit and test the relay operation
Command the pump on with a scan tool if supported and listen for or feel the pump running
Use a multimeter to check for supply voltage, earth continuity and control signal at the pump connector, following the wiring diagram for the vehicle
Test the pump winding resistance against the manufacturer specification
Carry out a continuity test of the control wire from the pump connector to the control module with the battery disconnected

How to fix

Repair or replace damaged wiring and secure the harness away from heat and sharp edges
Clean or replace corroded or damaged connectors and terminals
Replace the fuel cooler pump if it is open circuit or fails to run when commanded
Replace the faulty fuse or relay after finding the reason it failed
Restore a poor earth connection
Replace or update the control module software only if a fault in the module or an outdated calibration is confirmed

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but fix it soon because poor fuel cooling may cause heat-related power loss or fuel system problems. Avoid hot weather, towing or hard driving until it is repaired.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.