WOMS
U code network Medium severity

U1368 U1368: "Control Module Communication Failure

The OBD2 code U1368 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are not properly communicating with each other

Definition

The OBD2 code U1368 indicates a communication failure between control modules in a vehicle, suggesting that one or more modules are not properly communicating with each other

Common causes

  • Faulty control module
  • Poor electrical connections
  • Damaged wiring or harness
  • Corroded connectors
  • Software issues or bugs
  • Low battery voltage
  • Interference from aftermarket devices
  • Faulty sensors or actuators
  • Grounding issues
  • Communication network failure (e.g., CAN bus issues)

Common misdiagnoses

  • Faulty control module
  • Wiring issues
  • Poor ground connections
  • Corrupted software/firmware
  • Faulty sensors
  • Communication network issues
  • Battery or power supply problems
  • Intermittent connection issues

Troubleshooting steps

  1. 1. Check for Additional 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

    Visual Inspection: Check the wiring and connectors related to the control modules for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent or corroded

  4. 4. Check Power and Ground

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

  5. 5. Test Communication Lines

    Use a scan tool to check if the control module is communicating with other modules. If possible, perform a network test to see if the communication lines (CAN bus, LIN bus, etc.) are functioning correctly

  6. 6. Look for short circuits or open circuits in the communication lines

  7. 7. Inspect for Intermittent Issues

    Sometimes, communication failures can be intermittent. Check for any patterns or specific conditions under which the code appears (e.g., temperature, vehicle speed)

  8. 8. Check for Software Updates

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

  9. 9. Reset the Codes

    Clear the trouble codes using the OBD-II scanner and see if the code returns. If it does, further investigation is needed

  10. 10. Test the Control Module

    If all else fails, the control module itself may be faulty. Consider testing or replacing the module if it is determined to be the source of the problem

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented common issues and solutions

  12. 12. Seek Professional Help

    If you are unable to resolve the issue, it may be best to consult a professional mechanic or technician who has experience with the specific vehicle and its systems.Conclusion Troubleshooting OBD-II code U1368 requires a systematic approach to identify the root cause of the communication failure. By following these steps, you can narrow down the potential issues and work towards a solution