U1259 – Lost Communication with Fuel Pump Control Module.
The ODBII code U1259 indicates that there is a loss of communication between the vehicle’s control module and the fuel pump control module, which may affect the fuel pump’s operation.
The severity of ODBII code U1259 is generally considered moderate to severe, as it indicates a loss of communication with the fuel pump control module, which can affect engine performance and operation.
Common Causes For: U1258 Lost Communication with Hybrid Powertrain Control Module (HPCM)”.
- Faulty Fuel Pump Control Module
- Wiring issues (damaged, corroded, or loose connections)
- Faulty fuel pump
- Blown fuses
- Malfunctioning engine control module (ECM)
- Software issues or updates needed
- Grounding problems
- Intermittent electrical connections
Common misdiagnosis for U1259 Lost Communication with Fuel Pump Control Module.
- Faulty fuel pump
- Bad fuel pump relay
- Wiring issues or shorts
- Faulty engine control module (ECM)
- Bad fuel pressure regulator
- Incorrectly installed or damaged connectors
- Faulty ignition switch
- Issues with the fuel system or fuel lines
Common Troubleshooting Steps
The OBD-II code U1259 indicates a “Lost Communication with Fuel Pump Control Module.” This code typically suggests that the Engine Control Module (ECM) is unable to communicate with the Fuel Pump Control Module (FPCM). Here are some common troubleshooting steps to diagnose and resolve this issue:
- 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.
- Inspect Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors between the ECM and the FPCM for any signs of damage, corrosion, or loose connections.
- **Repair or Replace: If any damaged wires or connectors are found, repair or replace them as necessary.
- Test the Fuel Pump Control Module: **Power and Ground: Verify that the FPCM is receiving the correct power and ground signals. Use a multimeter to check voltage and ground continuity.
- **Module Functionality: If possible, test the FPCM separately to ensure it is functioning correctly. This may involve using a scan tool or specialized equipment.
- Check for Communication Issues: **CAN Bus Integrity: Inspect the Controller Area Network (CAN) bus for any faults. Check for short circuits, open circuits, or resistance issues in the communication lines.
- **Scan Tool Communication: Ensure that the scan tool can communicate with other modules in the vehicle. If communication is lost with multiple modules, it may indicate a broader network issue.
- Inspect the Fuel Pump: **Operation Check: Ensure that the fuel pump is functioning correctly. If the pump is not operating, it may cause communication issues with the FPCM.
- **Fuel Pump Relay: Check the fuel pump relay and associated fuses to ensure they are working properly.
- Check for Software Updates: **ECM/FPCM Software: Check if there are any software updates available for the ECM or FPCM. Sometimes, manufacturers release updates to fix communication issues.
- Perform a Hard Reset: Disconnect the vehicle’s battery for a few minutes to reset the ECM and clear any temporary communication issues. Reconnect the battery and see if the code returns.
- Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the U1259 code or fuel pump communication issues for your specific vehicle make and model. Manufacturers may have specific recommendations or known fixes.
- Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U1259 code. Always refer to the vehicle’s service manual for specific procedures and specifications.