WOMS
U code network Medium severity

U1539 U1539: "Module Communication Failure

The OBD2 code U1539 indicates a "Module Communication Failure," meaning there is a problem with communication between vehicle modules, often due to a fault in the wiring, connectors, or the modules themselves

Definition

The OBD2 code U1539 indicates a "Module Communication Failure," meaning there is a problem with communication between vehicle modules, often due to a fault in the wiring, connectors, or the modules themselves

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning module
  • Corrupted software or firmware in the module
  • Poor ground connections
  • Interference from aftermarket devices
  • Low battery voltage or weak battery
  • Communication network issues (e.g., CAN bus problems)
  • Water intrusion or damage to the module

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Software issues or updates needed
  • Battery or power supply problems
  • Grounding issues
  • Intermittent communication issues
  • Other communication protocol failures

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or lead to the root cause of the communication failure

  2. 2. Inspect Wiring and Connectors

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

  4. 4. Pay special attention to ground connections, as poor grounding can lead to communication issues

  5. 5. Check Power Supply

    Ensure that the affected modules are receiving the proper voltage. Use a multimeter to check the power supply to the modules

  6. 6. Test Communication Lines

  7. 7. Use a scan tool to check if the affected module is communicating with the scan tool. If it is not, there may be a fault in the module itself or the communication lines

  8. 8. If possible, use an oscilloscope to check the data lines for proper signals

  9. 9. Inspect for Interference

    Look for any aftermarket devices or modifications that may interfere with the communication between modules. This includes things like alarm systems, stereo systems, or other electronic devices

  10. 10. Reset the Modules

    Sometimes, simply resetting the modules can resolve communication issues. Disconnect the battery for a few minutes, then reconnect it and see if the code returns

  11. 11. Update Software/Firmware

    Check if there are any software updates available for the vehicle's control modules. Sometimes, manufacturers release updates to fix communication issues

  12. 12. Replace Faulty Module

    If all other steps fail and you have determined that a specific module is not functioning correctly, it may need to be replaced

  13. 13. Professional Diagnosis

    If you are unable to resolve the issue, consider taking the vehicle to a professional mechanic or dealership for further diagnosis. They may have specialized tools and knowledge to address complex communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U1539 code