WOMS
P code powertrain Medium severity

P252D Fuel Pump Control Module Performance

The OBD2 code P252D indicates that the fuel pump control module is not performing as expected, which may affect the fuel delivery to the engine

Definition

The OBD2 code P252D indicates that the fuel pump control module is not performing as expected, which may affect the fuel delivery to the engine

Common causes

  • Faulty fuel pump control module
  • Wiring issues or damaged connectors
  • Poor ground connections
  • Faulty fuel pump
  • Low fuel pressure
  • Malfunctioning fuel pressure sensor
  • Software issues or programming errors
  • Electrical shorts or open circuits in the fuel pump circuit
  • Corroded terminals or connectors

Common misdiagnoses

  • Faulty fuel pump
  • Clogged fuel filter
  • Bad fuel pressure regulator
  • Wiring issues or shorts in the fuel pump circuit
  • Defective fuel pump relay
  • Engine control module (ECM) issues
  • Incorrectly diagnosed fuel injectors
  • Battery or charging system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Fuel Pump Control Module

    Locate the FPCM and visually inspect it for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the module is securely mounted and that all connectors are clean and free of debris

  4. 4. Check Wiring and Connectors

    Inspect the wiring harness leading to the FPCM for any signs of wear, fraying, or damage

  5. 5. Check the connectors for corrosion or bent pins that could affect the electrical connection

  6. 6. Test the Fuel Pump

    Verify that the fuel pump is functioning correctly. You can do this by listening for the pump's operation when the ignition is turned on or by using a fuel pressure gauge to check the fuel pressure

  7. 7. If the fuel pump is not working, it may need to be replaced

  8. 8. Test the FPCM

    If the fuel pump is functioning correctly, test the FPCM itself. This may involve checking the voltage and ground signals to the module

  9. 9. Consult the vehicle’s service manual for specific testing procedures and specifications

  10. 10. Check for Fuel System Issues

    Inspect the fuel lines for blockages or leaks that could affect fuel delivery

  11. 11. Ensure that the fuel filter is not clogged and is allowing proper fuel flow

  12. 12. Inspect the Power and Ground Circuits

    Use a multimeter to check the power and ground circuits to the FPCM. Ensure that the module is receiving the correct voltage and has a good ground connection

  13. 13. Look for Software Updates or Recalls

    Check if there are any software updates or recalls related to the FPCM for your vehicle model. Sometimes, manufacturers release updates to address known issues

  14. 14. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  15. 15. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the P252D code