WOMS
U code network High severity

U2064 Control Module Communication Bus Off

The OBD2 code U2064 indicates a communication issue where a control module is not able to communicate on the vehicle's communication bus, often due to a fault in the module or wiring

Definition

The OBD2 code U2064 indicates a communication issue where a control module is not able to communicate on the vehicle's communication bus, often due to a fault in the module or wiring

Common causes

  • Faulty control module
  • Damaged wiring or connectors
  • Poor ground connections
  • Communication bus short circuit
  • Open circuit in the communication bus
  • Faulty or disconnected CAN bus transceiver
  • Interference from aftermarket devices
  • Software or firmware issues in control modules

Common misdiagnoses

  • Faulty control module
  • Wiring issues
  • Poor ground connections
  • Corrupted software/firmware
  • Faulty sensors
  • Battery or power supply problems
  • Intermittent connection issues
  • Other communication bus faults (e.g., CAN bus 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. This can provide additional context for the issue

  2. 2. Inspect Wiring and Connectors

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

  3. 3. Pay special attention to the ground connections, as poor grounding can lead to communication issues

  4. 4. Check the Communication Bus

    Use a multimeter or an oscilloscope to check the voltage levels and signal integrity on the communication bus (CAN bus, LIN bus, etc.)

  5. 5. Ensure that the bus is not shorted to ground or power, and that the termination resistors (if applicable) are present and functioning

  6. 6. Test Individual Modules

    If possible, isolate and test each control module on the communication bus. This can help identify if a specific module is causing the issue

  7. 7. Disconnect each module one at a time and check if the code persists after each disconnection

  8. 8. Check for Software Updates

    Verify if there are any software updates available for the control modules. Sometimes, communication issues can be resolved with a software update

  9. 9. Inspect for Physical Damage

    Check for any signs of physical damage to the control modules themselves. Water intrusion, impact damage, or overheating can cause modules to fail

  10. 10. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the control modules. Reconnect the battery and see if the code reappears

  11. 11. Scan for Communication Issues

    Use a professional-grade scan tool to perform a network scan. This can help identify which module is not communicating properly

  12. 12. Check Power Supply to Modules

    Ensure that all control modules are receiving the proper voltage and ground. Use a multimeter to check the power supply to each module

  13. 13. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with automotive electronics and communication systems. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the U2064 code