WOMS
U code network High severity

U005D Lost Communication with Vehicle Control Module

The OBD2 code U005D indicates a loss of communication with the vehicle control module, suggesting that the module is not responding or is unable to communicate with other modules in the vehicle's network

Definition

The OBD2 code U005D indicates a loss of communication with the vehicle control module, suggesting that the module is not responding or is unable to communicate with other modules in the vehicle's network

Common causes

  • Faulty vehicle control module (VCM)
  • Damaged wiring or connectors
  • Poor ground connections
  • Corroded connectors
  • Faulty communication network (CAN bus)
  • Short circuits in the wiring
  • Intermittent electrical issues
  • Software or firmware issues in the VCM
  • Battery or power supply problems

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective vehicle control module (VCM)
  • Issues with other control modules
  • Battery or charging system problems
  • Faulty sensors
  • Software or firmware issues
  • Grounding problems
  • Corrupted data communication lines

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 which module is having communication issues

  2. 2. Inspect Wiring and Connectors

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

  4. 4. Pay special attention to the wiring harnesses that connect the modules, as these can be prone to wear and tear

  5. 5. Check Power and Ground

  6. 6. Ensure that the affected control module has proper power and ground connections. Use a multimeter to check voltage and ground continuity

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

  8. 8. Test the Control Module

  9. 9. If the wiring and connections are intact, the control module itself may be faulty. If possible, test the module by swapping it with a known good unit or using a diagnostic tool to check its functionality

  10. 10. Inspect the CAN Bus

  11. 11. The communication between control modules often occurs over the Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens

  12. 12. Use a CAN bus scanner to monitor the communication and identify any anomalies

  13. 13. Check for Software Updates

  14. 14. Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the control modules

  15. 15. Clear Codes and Test Drive

  16. 16. 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

  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 known communication issues

  19. 19. Professional Diagnosis

  20. 20. If the issue persists after performing the above steps, it may be necessary to seek the assistance of a professional mechanic or automotive technician who has experience with advanced diagnostic tools. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U005D code