WOMS
U code network High severity

U1064 Lost Communication with Body Control Module (BCM)"

The OBD2 code U1064 indicates that there is a loss of communication between the vehicle's control module and the Body Control Module (BCM), which may affect various electrical functions and systems in the vehicle

Definition

The OBD2 code U1064 indicates that there is a loss of communication between the vehicle's control module and the Body Control Module (BCM), which may affect various electrical functions and systems in the vehicle

Common causes

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

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or damaged connectors
  • Faulty Instrument Cluster
  • Malfunctioning Powertrain Control Module (PCM)
  • Battery or charging system problems
  • Corroded grounds or poor ground connections
  • Faulty communication lines (CAN bus issues)
  • Software or firmware issues in the BCM or other modules

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 more context and help identify related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors leading 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 at the BCM connector

  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, there may be a fault in 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 Short Circuits

    Inspect the wiring for any short circuits to ground or power that could affect communication with the BCM

  11. 11. Look for Intermittent Issues

    If the code is intermittent, try to replicate the conditions under which the code appears. This could involve checking for specific vehicle conditions or operations

  12. 12. Reset the Codes

    Clear the trouble codes using the OBD-II scanner and see if the code returns after a test drive. This can sometimes reset communication issues

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the BCM or communication issues for your specific vehicle make and model. Manufacturers may have known fixes for common problems

  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 BCM-related issues. By following these steps, you should be able to identify the cause of the U1064 code and take appropriate action to resolve the communication issue with the Body Control Module