WOMS
P code powertrain Medium severity

P008D Fuel Cooler Pump Control Circuit Low

The OBD2 code P008D indicates a low voltage or malfunction in the fuel cooler pump control circuit, which may affect the operation of the fuel cooling system

Definition

The OBD2 code P008D indicates a low voltage or malfunction in the fuel cooler pump control circuit, which may affect the operation of the fuel cooling system

Common causes

  • Faulty fuel cooler pump
  • Damaged wiring or connectors
  • Blown fuse
  • Faulty fuel pump control module
  • Poor ground connection
  • Short circuit in the circuit
  • Open circuit in the circuit

Common misdiagnoses

  • Fuel pump failure
  • Fuel pressure regulator issues
  • Fuel injector problems
  • Wiring or connector issues
  • Engine control module (ECM) faults
  • Fuel filter blockage
  • Low fuel pressure
  • Vacuum leaks
  • Faulty fuel cooler pump
  • Sensor malfunctions

Troubleshooting steps

  1. 1. Check for Additional Codes

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

  2. 2. Inspect the Fuel Cooler Pump

  3. 3. Locate the fuel cooler pump and visually inspect it for any signs of damage, corrosion, or leaks

  4. 4. If accessible, check the pump's electrical connector for any signs of damage, corrosion, or loose connections

  5. 5. Test the Fuel Cooler Pump

  6. 6. If possible, test the fuel cooler pump directly by applying power to it to see if it operates. If it does not work, the pump may need to be replaced

  7. 7. Check the Wiring and Connectors

  8. 8. Inspect the wiring harness and connectors leading to the fuel cooler pump for any signs of wear, fraying, or damage

  9. 9. Look for any loose connections or broken wires that could be causing a poor electrical connection

  10. 10. Measure Voltage and Ground

  11. 11. Use a multimeter to check the voltage at the fuel cooler pump connector while the vehicle is running. You should see a voltage reading that matches the specifications in the vehicle's service manual

  12. 12. Also, check for a good ground connection at the pump. A poor ground can cause low voltage readings

  13. 13. Check the Fuel Pump Control Module

  14. 14. If the wiring and pump are in good condition, the issue may lie with the fuel pump control module. Check for any faults or issues with the module itself

  15. 15. Consult the vehicle's service manual for testing procedures specific to the control module

  16. 16. Inspect Fuses and Relays

  17. 17. Check the fuses and relays associated with the fuel cooler pump circuit. A blown fuse or faulty relay can cause low voltage issues

  18. 18. Look for Short Circuits

  19. 19. Inspect the circuit for any potential short circuits that could be causing the low voltage reading. This may involve checking for pinched wires or damaged insulation

  20. 20. Clear Codes and Test Drive

  21. 21. After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  22. 22. Consult a Professional

  23. 23. If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify the cause of the P008D code and take appropriate action to resolve the issue