WOMS
U code network Medium severity

U1307 U1307: "Module Communication Failure

The OBD2 code U1307 indicates a communication failure between modules in the vehicle's network, suggesting that one or more electronic control units (ECUs) are not communicating properly with each other

Definition

The OBD2 code U1307 indicates a communication failure between modules in the vehicle's network, suggesting that one or more electronic control units (ECUs) are not communicating properly with each other

Common causes

  • Faulty wiring or connectors
  • Failed control module
  • Corroded or damaged connectors
  • Poor ground connections
  • Intermittent communication issues
  • Low battery voltage
  • Software or firmware issues
  • Electrical interference
  • Faulty CAN bus system
  • Incompatible or missing modules

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control modules
  • Battery or charging system issues
  • Grounding problems
  • Software or firmware issues
  • Intermittent electrical connections
  • Corroded terminals or connectors
  • Faulty sensors or actuators

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, other codes can provide additional context for the U1307 code

  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 the ground connections, as poor grounding can lead to communication issues

  5. 5. Check Module Power Supply

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

  7. 7. If a module is not receiving power, trace the wiring back to the fuse box and check for blown fuses or damaged wiring

  8. 8. Test Communication Lines

  9. 9. Use a scan tool to check the communication lines (CAN bus, LIN bus, etc.) for continuity and proper voltage levels

  10. 10. If you have access to a scope, you can check the signal quality on the communication lines

  11. 11. Inspect for Short Circuits

  12. 12. Check for any short circuits in the wiring that could be causing interference with communication between modules

  13. 13. Check for Module Malfunction

  14. 14. If the wiring and connections are good, the issue may be with the module itself. If possible, test the module in another vehicle or replace it with a known good module to see if the problem persists

  15. 15. Reset the Modules

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

  17. 17. Update Software/Firmware

  18. 18. Check if there are any software updates available for the vehicle's control modules. Sometimes, communication issues can be resolved with a software update

  19. 19. Consult Technical Service Bulletins (TSBs)

  20. 20. Look for any TSBs related to the U1307 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that can help in troubleshooting

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing the above steps, it may be necessary to consult a professional technician who has experience with your vehicle's specific systems and can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the underlying cause of the U1307 code