WOMS
U code network High severity

U2353 U2353: Control Module Communication Bus Fault

The OBD2 code U2353: Control Module Communication Bus Fault indicates a communication issue between control modules in the vehicle's network, suggesting that one or more modules are not properly communicating with each...

Definition

The OBD2 code U2353: Control Module Communication Bus Fault indicates a communication issue between control modules in the vehicle's network, suggesting that one or more modules are not properly communicating with each other

Common causes

  • Faulty control module
  • Damaged wiring or connectors
  • Poor ground connections
  • Short circuits in the communication bus
  • Intermittent electrical connections
  • Corroded terminals
  • Software issues or bugs in the control module
  • Faulty sensors or actuators affecting communication
  • Aftermarket modifications or installations
  • Low battery voltage or power supply issues

Common misdiagnoses

  • Faulty control module
  • Wiring issues
  • Poor ground connections
  • Corrupted software/firmware
  • Faulty sensors
  • Battery or power supply issues
  • Intermittent connection problems
  • Other communication bus faults (e.g., CAN bus issues)

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

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

  3. 3. Pay special attention to the communication bus wires (CAN bus, LIN bus, etc.) and ensure they are intact

  4. 4. Check for Short Circuits or Open Circuits

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

  5. 5. Test Control Modules

    If possible, test the individual control modules for proper operation. This may involve using specialized diagnostic tools or software

  6. 6. If a specific module is suspected to be faulty, consider replacing it or reprogramming it if necessary

  7. 7. Inspect Ground Connections

    Ensure that all ground connections for the control modules are secure and free of corrosion. Poor grounding can lead to communication issues

  8. 8. Check for Interference

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

  9. 9. Perform a Network Test

    Some advanced diagnostic tools can perform a network test to check the integrity of the communication bus. This can help identify which module is causing the fault

  10. 10. 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 returns

  11. 11. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific make and model of your vehicle. By following these steps, you should be able to identify and resolve the underlying issue causing the U2353 code