WOMS
U code network High severity

U1584 Lost Communication with the Fuel Pump Control Module

The OBD2 code U1584 indicates a loss of communication between the vehicle's main control module and the fuel pump control module, which may affect fuel delivery and engine performance

Definition

The OBD2 code U1584 indicates a loss of communication between the vehicle's main control module and the fuel pump control module, which may affect fuel delivery and engine performance

Common causes

  • Faulty Fuel Pump Control Module
  • Damaged wiring or connectors
  • Poor ground connection
  • Blown fuse
  • Faulty fuel pump
  • Corroded terminals
  • Communication network issues (e.g., CAN bus problems)
  • Malfunctioning engine control module (ECM)

Common misdiagnoses

  • Faulty fuel pump
  • Bad fuel pump relay
  • Wiring issues or shorts
  • Defective engine control module (ECM)
  • Faulty fuel level sensor
  • Corroded connectors
  • Issues with the powertrain control module (PCM)
  • Battery or charging system problems
  • Faulty ignition switch
  • Software issues or updates needed in the control modules

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 additional context and help identify related issues

  2. 2. Inspect the Fuel Pump Control Module (FPCM)

    Visual Inspection: Check the FPCM for any visible damage, corrosion, or loose connections

  3. 3. Connector Check

    Ensure that the electrical connectors to the FPCM are secure and free of corrosion or dirt

  4. 4. Check Wiring and Connections

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

  5. 5. Look for any broken or loose wires that could interrupt communication

  6. 6. Test the Fuel Pump Control Module

    If possible, test the FPCM with a multimeter to ensure it is receiving power and ground

  7. 7. Check the module's output signals to ensure it is functioning correctly

  8. 8. Check for Communication Issues

    Use a scan tool to check if the FPCM is communicating with the vehicle’s network. If it is not, there may be a problem with the module itself or the communication lines

  9. 9. Inspect the CAN (Controller Area Network) bus for any issues, as communication problems can stem from other modules on the network

  10. 10. Inspect the Fuel Pump

    Ensure that the fuel pump itself is functioning properly. A malfunctioning fuel pump can sometimes cause communication issues with the FPCM

  11. 11. Check the fuel pump relay and fuse to ensure they are operational

  12. 12. Check for Ground Issues

    Ensure that the FPCM has a good ground connection. Poor grounding can lead to communication failures

  13. 13. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the system. Reconnect and see if the code reappears

  14. 14. Update Software/Firmware

    In some cases, updating the vehicle’s software or firmware may resolve communication issues. Check with the manufacturer for any available updates

  15. 15. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the FPCM.1

  16. 16. Replace the Fuel Pump Control Module

    If all other steps have been exhausted and the FPCM is still not communicating, it may need to be replaced.1

  17. 17. Seek Professional Help

    If you are unable to diagnose or resolve the issue, consider taking the vehicle to a qualified technician or dealership for further diagnosis.Conclusion Always remember to follow safety precautions when working on a vehicle, especially when dealing with electrical components and fuel systems. Proper diagnosis is key to resolving OBD-II codes effectively