WOMS
U code network Medium severity

U2247 U2247: Vehicle Communication Bus Malfunction

The OBD2 code U2247: Vehicle Communication Bus Malfunction indicates a problem with the communication network between various control modules in the vehicle, which may affect their ability to exchange data properly

Definition

The OBD2 code U2247: Vehicle Communication Bus Malfunction indicates a problem with the communication network between various control modules in the vehicle, which may affect their ability to exchange data properly

Common causes

  • Faulty OBD-II connector
  • Damaged wiring or connectors in the communication bus
  • Malfunctioning control modules
  • Poor ground connections
  • Corroded or loose terminals
  • Software issues or bugs in the control modules
  • Interference from aftermarket devices
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty ABS module
  • Defective engine control module (ECM)
  • Malfunctioning body control module (BCM)
  • Wiring issues or shorts in the communication lines
  • Faulty sensors or actuators
  • Battery or power supply problems
  • Corroded connectors or terminals
  • Software or firmware issues in the control modules

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the CAN bus. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the connectors on the modules that are part of the communication network

  4. 4. Check for Short Circuits or Open Circuits

    Use a multimeter to check for continuity in the CAN bus wiring. Look for any short circuits or open circuits that could disrupt communication

  5. 5. Test the Modules

    Identify the modules that are part of the communication network (e.g., Engine Control Module, Transmission Control Module, Body Control Module)

  6. 6. Check if the modules are functioning properly. If a specific module is not responding, it may need to be replaced

  7. 7. Inspect the CAN Bus Termination Resistors

    Ensure that the CAN bus has the correct termination resistors (typically 120 ohms) at both ends of the bus. A missing or faulty resistor can cause communication issues

  8. 8. Check for Interference

    Look for any aftermarket devices or modifications that may interfere with the CAN bus communication. This includes alarm systems, stereo systems, or other electronic devices

  9. 9. Perform a Network Test

    If available, use a professional scan tool to perform a network test. This can help identify which module is not communicating properly

  10. 10. Update Software/Firmware

    Check if there are any software or firmware updates available for the vehicle’s modules. Sometimes, updating the software can resolve communication issues

  11. 11. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears

  12. 12. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who specializes in automotive electronics.Conclusion Troubleshooting a U2247 code can be complex due to the nature of vehicle communication systems. Following these steps systematically can help identify and resolve the underlying issue. Always refer to the vehicle's service manual for specific information related to the make and model you are working on