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U1014Lost Communication with Body Control Module (BCM)

The OBD2 code U1014 indicates a loss of communication between the vehicle's control module and the Body Control Module (BCM), which can affect various electrical systems and functions

Definition

The OBD2 code U1014 indicates a loss of communication between the vehicle's control module and the Body Control Module (BCM), which can affect various electrical systems and functions

Common causes

  • Faulty Body Control Module (BCM)
  • Damaged wiring or connectors
  • Corroded terminals
  • Poor ground connection
  • Faulty communication network (CAN bus issues)
  • Blown fuses
  • Software or firmware issues in the BCM
  • Intermittent electrical connections
  • Other module failures affecting communication

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or damaged connectors
  • Faulty Engine Control Module (ECM)
  • Low battery voltage or weak battery
  • Corrupted software or firmware in BCM
  • Faulty communication lines (CAN bus issues)
  • Grounding issues
  • Other module failures (e.g., ABS, airbag module)

Troubleshooting steps

  1. 1.Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate related issues

  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.Test Communication Lines

    CAN Bus: Use a scan tool to check the communication on the CAN bus. If other modules are not communicating, the issue may be with the bus itself

  9. 9.Scope Testing

    If available, use an oscilloscope to check for proper signal patterns on the communication lines

  10. 10.Check for Intermittent Issues

    Temperature Sensitivity: Sometimes, issues can be temperature-related. Monitor the BCM operation under different conditions

  11. 11.Vibration

    Check if the issue occurs when the vehicle is in motion or over bumps

  12. 12.Perform a Hard Reset

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

  13. 13.Update Software

    Check if there are any software updates available for the BCM. Sometimes, manufacturers release updates to fix communication issues

  14. 14.Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the BCM or communication issues for your specific vehicle make and model

  15. 15.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

  16. 16.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 BCM-related issues. By following these steps, you should be able to identify the root cause of the U1014 code and take appropriate action to resolve it