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U1392 U1392: "Control Module Communication Failure

The OBD2 code U1392 indicates a "Control Module Communication Failure," meaning there is a problem with communication between the vehicle's control modules, which can affect various systems and functions

Definition

The OBD2 code U1392 indicates a "Control Module Communication Failure," meaning there is a problem with communication between the vehicle's control modules, which can affect various systems and functions

Common causes

  • Faulty control module
  • Poor electrical connections
  • Damaged wiring harness
  • Corroded connectors
  • Software issues or bugs
  • Low battery voltage
  • Interference from aftermarket devices
  • Faulty CAN bus communication
  • Grounding issues

Common misdiagnoses

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

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 control modules. Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the wiring harnesses that connect the affected modules

  5. 5. Check Power and Ground

  6. 6. Ensure that the control modules have proper power and ground connections. Use a multimeter to check for voltage and continuity at the power and ground terminals of the modules

  7. 7. Test Control Modules

  8. 8. If possible, test the affected control modules individually. This may involve using a scan tool to communicate with each module and check for proper operation

  9. 9. If a specific module is unresponsive, it may need to be replaced

  10. 10. Inspect the CAN Bus

  11. 11. U1392 is often related to issues with the Controller Area Network (CAN) bus. Check for any faults in the CAN bus wiring, such as shorts, opens, or high resistance

  12. 12. Use a CAN bus diagnostic tool to monitor the bus for errors or communication issues

  13. 13. Check for Software Updates

  14. 14. Sometimes, control modules may require software updates to resolve communication issues. Check with the manufacturer for any available updates

  15. 15. Clear Codes and Test Drive

  16. 16. After performing any repairs or inspections, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  17. 17. Consult Technical Service Bulletins (TSBs)

  18. 18. Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to U1392

  19. 19. Professional Diagnosis

  20. 20. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues. By following these steps, you can systematically identify and address the underlying cause of the U1392 code