FixItFor.Us
U code network Medium severity

U2164 U2164: "Module Communication Failure

The OBD2 code U2164 indicates a communication failure between modules in a vehicle's network, suggesting that one or more electronic control units (ECUs) are unable to communicate properly with each other

Definition

The OBD2 code U2164 indicates a communication failure between modules in a vehicle's network, suggesting that one or more electronic control units (ECUs) are unable to communicate properly with each other

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning control module
  • Corrupted software or firmware in the module
  • Poor ground connections
  • Intermittent electrical issues
  • Communication network issues (e.g., CAN bus problems)
  • Low battery voltage or power supply issues
  • Damaged or shorted circuits

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Battery or power supply issues
  • Software glitches or updates needed
  • Grounding problems
  • Intermittent communication issues
  • Other communication protocol failures
  • Sensor malfunctions

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 you 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 affected module(s). Look for signs of damage, corrosion, or loose connections

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

  5. 5. Check Power Supply

    Ensure that the affected module is receiving the proper voltage. Use a multimeter to check the power and ground circuits

  6. 6. Test the Affected Module

    If you can identify which module is having communication issues, you may need to test or replace it. This can involve

  7. 7. Checking the module's functionality with a scan tool

  8. 8. Performing a reset or reprogramming if necessary

  9. 9. Inspect the CAN Bus

  10. 10. If the vehicle uses a Controller Area Network (CAN) bus, check for issues on the bus itself. This can include checking for short circuits, open circuits, or excessive resistance

  11. 11. Use an oscilloscope to monitor the CAN signals if you have access to one

  12. 12. Check for Interference

    Sometimes, aftermarket accessories or modifications can interfere with module communication. If any recent changes have been made to the vehicle, consider reverting them to see if the issue resolves

  13. 13. Perform a Hard Reset

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

  14. 14. Update Software

    In some cases, a software update for the affected module(s) may be necessary. Check with the manufacturer for any available updates

  15. 15. Consult Technical Service Bulletins (TSBs)

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

  16. 16. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or dealership with advanced diagnostic tools. By following these steps, you can systematically identify and address the underlying cause of the U2164 code