Open or high-resistance wiring in the pump control circuit, such as a broken wire or corroded connector.; Failed fuel cooler pump motor (open winding or worn brushes).; Blown fuse or faulty relay dedicated to the fuel cooler pump circuit.; Poor ground connection for the pump or the PCM.; Corrosion or water intrusion at the pump electrical connector.; Faulty PCM driver for the pump control circuit (less common).

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P008D

P008DFuel Cooler Pump Control Circuit Low

Q: What does code P008D mean?

Fuel Cooler Pump Control Circuit Low. P008D indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current draw on the control circuit for the fuel cooler pump. The PCM expects a specific electrical load when it commands the pump on, and a low condition means the circuit is drawing less current than expected, often due to an open circuit, poor connection, or a failed pump.

P008D indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current draw on the control circuit for the fuel cooler pump. The PCM expects a specific electrical load when it commands the pump on, and a low condition means the circuit is drawing less current than expected, often due to an open circuit, poor connection, or a failed pump.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms.
Reduced fuel economy or slightly elevated fuel temperatures in severe cases.
In rare instances, the engine may enter a limp mode or exhibit reduced power.
A faint or absent pump whine when the ignition is turned on, if the pump is normally audible.
Intermittent code setting during driving, especially after the engine reaches operating temperature.

Common causes, most likely first

Open or high-resistance wiring in the pump control circuit, such as a broken wire or corroded connector.
Failed fuel cooler pump motor (open winding or worn brushes).
Blown fuse or faulty relay dedicated to the fuel cooler pump circuit.
Poor ground connection for the pump or the PCM.
Corrosion or water intrusion at the pump electrical connector.
Faulty PCM driver for the pump control circuit (less common).

How to diagnose and fix it

Verify the code with a scan tool and check for any related codes in other modules.
Inspect the fuel cooler pump fuse and relay, replacing any that are blown or faulty.
Perform a visual inspection of the pump wiring and connector for damage, corrosion, or loose pins.
Disconnect the pump connector and measure resistance across the pump motor terminals to check for an open winding.
With the pump commanded on, measure voltage and current at the pump connector to confirm the circuit integrity.
Check the ground circuit for the pump and PCM using a voltage drop test.
If all electrical checks pass, suspect the PCM and perform pinpoint tests according to the manufacturer's service information.

Don't overlook the fuel cooler pump relay

A common oversight is replacing the fuel cooler pump without first testing the relay, which can fail intermittently and set a low circuit code.
The code can be set by a poor ground connection at the chassis, not just by a faulty pump or wiring, so always verify ground integrity.
On some vehicles, the fuel cooler pump only runs under specific conditions, such as high fuel temperature or engine load, so the code may not set during a simple key-on test.
A low circuit code does not always mean the pump is dead; a high-resistance connection can cause the same code while the pump still operates intermittently.
Related codes such as P008A or P008B may also be present, indicating a broader fuel system pressure or temperature issue that should be addressed first.

Can I keep driving with P008D?

You can generally continue driving with this code, but avoid heavy loads or sustained high-speed driving that could raise fuel temperatures. If the engine enters limp mode or you notice performance loss, have the vehicle inspected promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.