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Technical Description of OBD-II Trouble Code
The circuit controlling the fuel cooler pump is experiencing high voltage.
What does that mean?
This generic powertrain diagnostic trouble code (DTC) typically applies to diesel engine OBD-II vehicles. This includes vehicles from Ford / Powerstroke, BMW, Dodge / Ram / Cummins, Chevrolet, GMC, and others. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
Trouble code P008E is one of several codes that can indicate a malfunction in the Fuel Cooler Pump Control Circuit of diesel-powered vehicles. This circuit is responsible for facilitating the proper operation of a diesel engine.
Common codes associated with Fuel Cooler Pump Control Circuit malfunctions are P008C, P008D, and P008E.
The Fuel Cooler Pump Control Circuit is designed to control the operation of the fuel cooler pump. This feature is specific to diesel-powered vehicles and is used to cool excess fuel before it is returned to the fuel supply system. The fuel cooler operates similarly to a radiator, using coolant to remove heat from the fuel.
The fuel cooler pump is temperature controlled by the Fuel Cooler Pump Control Circuit. It turns the pump on to route fuel through the fuel cooler assembly before returning it to the fuel tank. The specific process may vary depending on the diesel-powered vehicle and fuel system configuration. The end result is optimal performance and protection of fuel system components.
Depending on the specific diesel-powered vehicle, the PCM may activate various other codes and illuminate the Check Engine Light.
Code P008E is set by the PCM when the Fuel Cooler Pump Control Circuit has higher than normal voltage.
In the provided photo, you can see the fuel cooler, the lines, and the fuel cooler pump (center) connected to the lines:
What is the severity of this DTC?
The severity of this code starts as moderate based on the specific malfunction, and the severity level will progress. High fuel temperatures are undesirable and can cause excessive wear on fuel system components and internal engine components if not addressed promptly.
What are some of the symptoms of the code?
Symptoms of a P008E engine code may include:
What are some of the possible causes of the code?
Possible causes for this code may include:
What are some P008E troubleshooting steps?
Locate all of the components associated with the Fuel Cooler Pump Control Circuit, including the fuel cooler pump, fuel cooler, fuel cooler reservoir, and PCM on a simplex system. Perform a thorough visual inspection of these components to check for obvious defects such as scraping, rubbing, bare wires, or burn spots. Also check for signs of coolant leaks and assess the level and condition of the fluid.
Advanced Steps
The advanced steps are highly vehicle specific and require the appropriate advanced equipment for accurate performance. These procedures involve using a digital multimeter and referencing specific technical information for the vehicle. The voltage requirements will vary depending on the specific year, model, and diesel engine of the vehicle.
It is also helpful to check for technical service bulletins (TSBs) for your particular vehicle, as there may be a known issue and fix that can save you time and money during diagnosis.
Circuit Checks
The voltage requirements for the Fuel Cooler Pump Control Circuit configuration and its components will vary. Refer to technical data to obtain the correct voltage range for each component and follow the appropriate troubleshooting sequence. If a fuel cooler pump that is not operating is found to have the correct voltage, it is usually an indication of internal failure. A faulty fuel cooler pump may also produce a squealing noise that may progress to a barking noise similar to a dog.
If this process reveals the absence of a power source or ground, continuity testing may be necessary to check the condition of the wiring and connectors. Continuity tests should always be performed with the power removed from the circuit, and the normal readings should be 0 ohms of resistance unless otherwise specified by the technical data. Resistance or lack of continuity indicates faulty wiring or connectors that are shorted or open and must be repaired or replaced.
What Are Some Common Repairs?
We hope that the information in this article has been helpful in guiding you towards resolving the problem with your Fuel Cooler Pump Control Circuit. Please note that this article is strictly informational, and the specific technical data and service bulletins for your vehicle should always take priority.
Professional Service
While we always recommend seeking professional mechanical assistance to solve this issue, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to function. If you are interested in this option, please upload your ECU file to our portal.
