WOMS
U code network Medium severity

U0248 Lost Communication With Remote Accessory Module

The OBD2 code U0248 indicates that there is a loss of communication with the remote accessory module, which may affect the operation of certain vehicle features or systems

Definition

The OBD2 code U0248 indicates that there is a loss of communication with the remote accessory module, which may affect the operation of certain vehicle features or systems

Common causes

  • Faulty Remote Accessory Module
  • Damaged wiring or connectors
  • Poor ground connection
  • Corroded terminals
  • Failed communication network (CAN bus issues)
  • Software glitches or programming errors
  • Battery voltage issues
  • Intermittent electrical connections

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective remote accessory module
  • Malfunctioning body control module (BCM)
  • Issues with the power supply or ground
  • Software or firmware issues
  • Other communication network faults (e.g., CAN bus issues)
  • Faulty sensors or actuators related to the module
  • Incorrectly programmed or configured 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 more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors associated with the remote accessory module for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent or corroded

  4. 4. Test the Remote Accessory Module

    If accessible, test the remote accessory module for proper operation. This may involve checking for power and ground at the module

  5. 5. Use a multimeter to verify that the module is receiving the correct voltage and that ground connections are solid

  6. 6. Check for Communication Issues

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

  7. 7. Inspect the CAN (Controller Area Network) bus for any issues. Look for shorts, opens, or other faults in the wiring

  8. 8. Inspect Fuses

    Check the vehicle’s fuse box for any blown fuses that may affect the remote accessory module. Replace any blown fuses and retest

  9. 9. Perform a Hard Reset

    Disconnect the vehicle’s battery for a few minutes to reset the vehicle’s computer systems. Reconnect the battery and see if the code returns

  10. 10. Update Software/Firmware

    Check if there are any software updates available for the vehicle’s ECU or the remote accessory module. Sometimes, communication issues can be resolved with a software update

  11. 11. Replace the Remote Accessory Module

    If all other steps fail and the module is still unresponsive, it may be necessary to replace the remote accessory module

  12. 12. 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 U0248 code

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after these steps, consider consulting a professional mechanic or an automotive technician who has experience with your vehicle make and model.Conclusion Troubleshooting the U0248 code involves a systematic approach to identify and rectify communication issues with the remote accessory module. Always ensure safety precautions are taken when working on vehicle electrical systems