Technical Description of OBD-II Trouble Code
Request for MIL Illumination by Fuel Pump Control Module
What does that signify?
This is a generic diagnostic trouble code (DTC) that is applicable to many OBD-II vehicles (1996-newer). This includes vehicles from GMC, Chevy, Buick, Cadillac, Ford, and others. While it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration.
A stored code P069E indicates that the powertrain control module (PCM) has detected a malfunction with the fuel pump control module, resulting in a request for malfunction indicator lamp (MIL) illumination.
The fuel pump control module is responsible for supplying and regulating voltage to the fuel pump relay and the fuel pump. Typically, the fuel pump controller is integrated into the PCM, but it can also be a separate module. The fuel pump provides pressurized fuel for the fuel injection system. It is usually located inside the fuel tank, but it can also be found along the fuel rail. Diesel propulsion systems often use high-pressure pumps that are mounted on and driven by the engine.
Every time the ignition is turned on and the PCM is energized, multiple controller self-tests are performed. The fuel pump control module is included in these controllers. By conducting internal controller self-tests, the PCM can monitor serial data transmitted over the controller area network (CAN) to ensure proper interfacing of on-board controllers.
If the fuel pump control module has requested MIL illumination, a code P069E will be stored, and the malfunction indicator lamp (MIL) may be illuminated.
Photo of a typical fuel pump control module:
What is the severity of this DTC?
Fuel pump control module codes should always be taken seriously. The conditions that cause a code P069E to be stored could result in various drivability issues and/or a no-start condition.
What are some of the symptoms of the code?
Symptoms of a P069E trouble code may include:
What are some of the common causes of the code?
Possible causes for this code may include:
What are some P069E troubleshooting steps?
If other fuel pump and/or fuel supply codes are stored, diagnose and repair those before attempting to diagnose the code P069E.
Refer to your vehicle information source for technical service bulletins (TSB) that match the stored code, vehicle (year, make, model, and engine), and exhibited symptoms. If you find the relevant TSB, it may provide helpful diagnostic information.
To diagnose a code P069E, you will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information.
Start by connecting the scanner to the vehicle diagnostic port and retrieving all stored codes and freeze frame data. It is advisable to write down this information in case the code proves to be intermittent. After recording all relevant information, clear the codes and test drive the vehicle (if possible) until the code is reset or the PCM enters readiness mode.
If the PCM enters readiness mode, the code is intermittent and will be more challenging to diagnose. The condition that caused the P069E to be stored may need to worsen before an accurate diagnosis can be made. If the code is reset, continue with your diagnosis.
Use your source of vehicle information to obtain connector face views, connector pin-out charts, component locators, wiring diagrams, and diagnostic flow charts related to the code and the specific vehicle.
Check if there is battery voltage on the fuel pump control circuit by referring to the appropriate wiring diagram and using your DVOM. If there is no voltage, check the system fuses and relays and replace any defective parts as necessary. If the vehicle is equipped with a fuel pump voltage shutoff switch, test it to ensure it has not been activated or is not faulty.
If there is no voltage (and/or ground) on the fuel pump control circuit (and all fuses and relays appear to be functioning properly), inspect the wiring and harnesses related to the controller. Also, check the chassis and engine ground junctions. Use your vehicle information source to find the ground locations for the relevant circuits.
If there is voltage (and ground) present on the fuel pump control circuit, inspect the system controllers for signs of water, heat, or collision damage. Any damaged controller, especially due to water, should be considered defective.
If the controller power and ground circuits are intact, suspect a defective controller or a controller programming error. Controller replacement will require reprogramming.
