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U014CLost Communication with Body Control Module (BCM) - No Communication

The OBD2 code U014C indicates that there is a loss of communication between the vehicle's control module and the Body Control Module (BCM), meaning the BCM is not responding or is unable to communicate with other...

Definition

The OBD2 code U014C indicates that there is a loss of communication between the vehicle's control module and the Body Control Module (BCM), meaning the BCM is not responding or is unable to communicate with other modules in the vehicle

Common causes

  • Faulty Body Control Module (BCM)
  • Damaged wiring or connectors
  • Corroded terminals
  • Blown fuses
  • Faulty communication network (CAN bus)
  • Software issues or programming errors
  • Low battery voltage or power supply issues
  • Grounding issues

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or damaged connectors
  • Faulty Engine Control Module (ECM)
  • Battery or power supply issues
  • Faulty communication network (CAN bus)
  • Corroded or loose ground connections
  • Faulty sensors or actuators
  • Software or firmware issues in the BCM or ECM

Troubleshooting steps

  1. 1.Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2.Inspect the Wiring and Connectors

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

  3. 3.Connector Pins

    Ensure that the pins in the connectors are not bent, corroded, or pushed back

  4. 4.Check Power and Ground

    Power Supply: Verify that the BCM is receiving the correct voltage. Use a multimeter to check the power supply to the BCM

  5. 5.Ground Connections

    Ensure that the ground connections for the BCM are secure and free of corrosion

  6. 6.Inspect the BCM

    Physical Condition: Check the BCM for any signs of physical damage or water intrusion

  7. 7.Reprogramming

    If the BCM has been replaced, ensure that it has been properly programmed to the vehicle

  8. 8.Check for Communication

    Scan Tool Communication: Use a scan tool to see if you can communicate with the BCM. If you cannot, it may indicate a problem with the BCM itself or the communication lines

  9. 9.Network Issues

    Check the CAN (Controller Area Network) bus for issues. If other modules are also not communicating, there may be a problem with the network

  10. 10.Inspect Related Modules

    Check other modules that communicate with the BCM (e.g., the Engine Control Module (ECM), Transmission Control Module (TCM), etc.) for any issues that might affect communication

  11. 11.Perform a Hard Reset

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

  12. 12.Check for Software Updates

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

  13. 13.Consult Technical Service Bulletins (TSBs)

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

  14. 14.Replace the BCM (if necessary)

    If all other troubleshooting steps fail and the BCM is determined to be faulty, consider replacing it. Ensure proper programming and configuration after replacement.1

  15. 15.Seek Professional Help

    If you are unable to resolve the issue, it may be best to consult a professional mechanic or dealership with experience in diagnosing and repairing communication issues.Conclusion Troubleshooting a U014C code can be complex, as it often involves multiple systems and components. Following these steps systematically can help identify the root cause of the communication loss with the BCM