U1584 – Lost Communication with the Fuel Pump Control Module.

The ODBII 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.

The severity of ODBII code U1584 is typically considered moderate to severe.

Common Causes For: U1583 Lost Communication with the Hybrid Powertrain Control Module (HPCM) A.

• 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 misdiagnosis for U1584 Lost Communication with the Fuel Pump Control Module.

• 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

Common Troubleshooting Steps

When dealing with OBD-II code U1584, which indicates “Lost Communication with the Fuel Pump Control Module,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• 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.
• Inspect the Fuel Pump Control Module (FPCM): **Visual Inspection: Check the FPCM for any visible damage, corrosion, or loose connections.
• **Connector Check: Ensure that the electrical connectors to the FPCM are secure and free of corrosion or dirt.
• Check Wiring and Connections: Inspect the wiring harness leading to the FPCM for any signs of damage, fraying, or shorts.
• Look for any broken or loose wires that could interrupt communication.
• Test the Fuel Pump Control Module: If possible, test the FPCM with a multimeter to ensure it is receiving power and ground.
• Check the module’s output signals to ensure it is functioning correctly.
• 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.
• Inspect the CAN (Controller Area Network) bus for any issues, as communication problems can stem from other modules on the network.
• 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.
• Check the fuel pump relay and fuse to ensure they are operational.
• Check for Ground Issues: Ensure that the FPCM has a good ground connection. Poor grounding can lead to communication failures.
• Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the system. Reconnect and see if the code reappears.
• 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.
• 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
• 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
• 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.