P008D: Fuel Cooler Pump Control Circuit Low

What Does The P008D Code Mean?

Trouble code P008D is one of several possible codes associated to diesel powered vehicles that indicates that the Powertrain Control Module (PCM) has detected a malfunction and with the operation of the Fuel Cooler Pump Control Circuit that is incorporated to facilitate the proper operation of a diesel engine.

The codes that are commonly associated to Fuel Cooler Pump Control Circuit malfunctions are P008C and P008E.

The purpose of the Fuel Cooler Pump Control Circuit is to control the operation of the fuel cooler pump. This feature is specific to diesel powered vehicles to cool the excess fuel prior to returning the fuel back to the fuel supply system.

The fuel is cooled by the fuel cooler that operates in a similar manner to a radiator using coolant to remove heat from the fuel.

The pump is temperature controlled by the Fuel Cooler Pump Control Circuit that turns the pump on to route fuel through the fuel cooler assembly prior to returning the fuel back to the fuel tank.

This process will vary based on the specific diesel powered vehicle and the fuel system configuration. The end result is the same providing optimum performance and protecting fuel system components.

Based of the specific diesel-powered vehicle involved, various other codes may be activated by the PCM and illuminate the Check Engine Light as well.

Code P008D is set by the PCM when the Fuel Cooler Pump Control Circuit has a low voltage condition.

What Are The Symptoms Of The P008D Code?

Symptoms of a P008D engine code may include:

• Decreased engine performance
• Acceleration and idle surging
• Check Engine Light illuminated
• Increased fuel consumption
• Noise coming from the fuel cooler pump

What Are The Potential Causes Of The P008D Code?

Causes for this code may include:

• Defective fuel cooler pump
• Corroded or damaged connector
• Faulty or damaged wiring
• Faulty PCM

How Serious Is This P008D Code?

The severity of this code starts as moderate based on the specific malfunction and the severity level will progress. Hot fuel temperatures are not desirable and can cause excessive wear on fuel system components and excessive wear to internal engine components as well if not corrected in a timely manner.

How Can You Fix The P008D Code?

Replacing the fuel cooler pump Cleaning corrosion from connectors Repairing or replacing wiring Flashing or replacing PCM Hopefully, the information in this article has been helpful to point you in the right direction to correct the problem with your Fuel Cooler Pump Control Circuit.

This article is strictly informational and the specific technical data and service bulletins for your vehicle should always take priority.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Twippo 372Pcs Waterproof Wire Connectors Kit

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

P008D: Fuel Cooler Pump Control Circuit Low, OBD-Codes.