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U code network Medium severity

U0142 Lost Communication With Body Control Module "B

The OBD2 code U0142 indicates that there is a lost communication issue between the vehicle's control module and the Body Control Module "B," which can affect various electrical functions and systems

Definition

The OBD2 code U0142 indicates that there is a lost communication issue between the vehicle's control module and the Body Control Module "B," which can affect various electrical functions and systems

Common causes

  • Faulty Body Control Module (BCM)
  • Damaged wiring or connectors
  • Corroded terminals
  • Poor ground connections
  • Faulty communication network (CAN bus issues)
  • Blown fuses
  • Software or firmware issues in the BCM
  • Malfunctioning related modules

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or damaged connectors
  • Faulty Instrument Cluster
  • Faulty Powertrain Control Module (PCM)
  • Battery or charging system issues
  • Faulty CAN bus communication
  • Grounding issues
  • Software or firmware issues in the BCM
  • Faulty sensors or actuators related to the BCM
  • Corroded or loose electrical connections

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 indicate related issues

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors related to the Body Control Module (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 damaged

  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 module

  5. 5. Ground Connections

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

  6. 6. Inspect the Body Control Module

    Module Condition: If possible, inspect the BCM for any physical damage or signs of water intrusion

  7. 7. Reprogramming

    In some cases, the BCM may need to be reprogrammed or updated with the latest software

  8. 8. Check for Communication Issues

    CAN Bus Communication: Use a scan tool to check if the BCM is communicating with other modules on the CAN bus. If other modules are also not communicating, there may be a network issue

  9. 9. Network Integrity

    Inspect the CAN bus wiring for shorts, opens, or other issues that could disrupt communication

  10. 10. Perform a Hard Reset

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

  11. 11. Test the Body Control Module

    If all else fails, you may need to test the BCM itself. This can involve bench testing or replacing the module with a known good unit to see if the problem persists

  12. 12. Consult Technical Service Bulletins (TSBs)

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

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or dealership with experience in diagnosing and repairing electrical issues.Conclusion Troubleshooting OBD-II code U0142 involves a systematic approach to check for communication issues, inspect wiring and connections, and verify the functionality of the Body Control Module. Always ensure safety precautions are taken when working with vehicle electronics