P008C OBD-II Trouble Code: Fuel Cooler Pump Control Circuit/Open

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A P008C trouble code is related to a diesel engine’s fuel cooler pump designed to maintain colder fuel temperatures.

What the P008C code means

P008C is an OBD-II code for a open circuit problem with the fuel cooler system. This code is illuminated to alert the driver that a connection among the controller circuit is broken, either from an unplugged connector, damaged connector, or damaged wire.

What causes the P008C code?

The most common causes for a P008C are:

  • Faulty fuel cooler pump connections
  • Faulty fuel cooler wiring
  • Faulty fuel cooler pump

What are the symptoms of the P008C code?

A P008C will typically not cause any noticeable symptoms other than a check engine light. In some cases, it can cause surging acceleration from a lack of fuel cooling.

How does a mechanic diagnose the P008C code?

Your mechanic will start with a visual inspection of the fuel cooler system, looking for unplugged connections and or damaged wiring, repairing as necessary. If connections and wiring appear to be in good condition, your mechanic will test the wiring and connectors using a digital multi meter. If a fault in the voltage is found, that section of wiring or connection will be replaced. If not, it may be necessary to replace the fuel cooler pump itself.

Common mistakes when diagnosing the P008C code

A P008C may be an intermittent issue from wear and tear. Getting rid of the code may be as simple as clearing it, running fuel treatment, and resetting the engine computer.

How serious is the P008C code?

Hot fuel temperatures are not desirable and can cause excessive wear on other fuel components. They can also cause poor acceleration which can be dangerous.

What repairs can fix the P008C code?

The most common repairs for a P008C are as follows:

  • Repairing or replacing damaged fuel cooler pump wiring
  • Repairing or replacing damaged fuel cooler circuit wiring
  • Replacing the fuel cooler pump

Additional comments for consideration regarding the P008C code

P008C codes are exceptionally common with Ford Powerstroke diesels, and even more so with the 6.4 liters from 2008 through 2010.

Need help with a P008C code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.


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6 years of experience
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Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

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Clifton
29 years of experience
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