Technical Description of OBD-II Trouble Code
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 Chrysler, Ford, General Motors, Mercedes-Benz, 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 P064A indicates that the powertrain control module (PCM) has detected a malfunction in the fuel pump control module.
The fuel pump control module is responsible for supplying and regulating voltage to the fuel pump relay and the fuel pump. In most cases, 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 and is typically located inside the fuel tank.
Each time the ignition is turned on and the PCM is powered, multiple controller self-tests are performed. By conducting internal controller self-tests, the PCM can monitor serial data transmitted over the controller area network (CAN) to ensure proper interaction with on-board controllers.
If a problem is detected in monitoring the fuel pump control module, a code P064A will be stored and a malfunction indicator lamp (MIL) may illuminate.
A typical fuel pump:
What is the severity of this DTC?
Fuel pump control module codes should be taken seriously. A stored code P064A could result in a no-start condition.
What are some of the symptoms of the code?
Symptoms of a P064A trouble code may include:
What are some of the common causes of the code?
Possible causes for this code may include:
What are some P064A troubleshooting steps?
To diagnose a code P064A, you will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information.
Refer to your vehicle information source for technical service bulletins (TSB) that match the stored code, vehicle details (year, make, model, and engine), and exhibited symptoms. If you find a relevant TSB, it may provide helpful diagnostic 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 is intermittent. After recording all relevant information, clear the codes and, if possible, test drive the vehicle until the code is reset or the PCM enters readiness mode.
If the PCM enters readiness mode, the code is intermittent and diagnosing it will be more challenging. The condition that caused the P064A code to be stored may need to worsen before an accurate diagnosis can be made. If the code is reset, continue with the 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 using the appropriate wiring diagram and 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 exposure, should be considered defective.
If the controller power and ground circuits are intact, suspect a defective controller or a controller programming error. Replacing the controller will require reprogramming.
