WOMS
U code network Medium severity

U016E U016E: "Control Module Communication Failure

The OBD2 code U016E indicates a communication failure between control modules in a vehicle, meaning that one or more modules are unable to communicate with each other properly

Definition

The OBD2 code U016E indicates a communication failure between control modules in a vehicle, meaning that one or more modules are unable to communicate with each other properly

Common causes

  • Faulty wiring or connectors
  • Failed control module
  • Corrupted software or firmware
  • Poor ground connections
  • Intermittent electrical issues
  • Communication network issues (e.g., CAN bus problems)
  • Battery voltage issues
  • Damaged or corroded pins in connectors

Common misdiagnoses

  • Faulty control module
  • Wiring issues
  • Poor ground connections
  • Corrupted software/firmware
  • Battery or power supply problems
  • Faulty connectors or terminals
  • Intermittent communication issues
  • Other communication protocol failures

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, multiple codes can provide more context for the issue

  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 control module to the rest of the vehicle

  5. 5. Check Power and Ground

  6. 6. Ensure that the control module has the proper power supply and ground. Use a multimeter to check for voltage at the module's power and ground pins

  7. 7. If there is no power or ground, trace the wiring back to the source to find the issue

  8. 8. Test the Control Module

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

  10. 10. Check for Communication

  11. 11. Use a scan tool to check if the control module is communicating with other modules. If it is not, there may be a fault in the communication network (e.g., CAN bus)

  12. 12. Look for any communication errors or issues with other modules that may be affecting the network

  13. 13. Inspect the CAN Bus

  14. 14. If the vehicle uses a CAN bus system, check for any issues with the bus itself. Look for short circuits, open circuits, or interference that could disrupt communication

  15. 15. Use an oscilloscope to check the CAN bus signals if you have access to one

  16. 16. Check for Software Updates

  17. 17. Sometimes, control modules may require software updates to function correctly. Check with the manufacturer or a dealership to see if there are any updates available for the affected module

  18. 18. Clear Codes and Test Drive

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

  20. 20. Consult Technical Service Bulletins (TSBs)

  21. 21. Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to control module communication

  22. 22. Seek Professional Help

  23. 23. If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these troubleshooting steps, you can systematically identify and address the underlying cause of the U016E code