WOMS
U code network High severity

U2371 U2371: BECM Communication Failure

The OBD2 code U2371: BECM Communication Failure indicates a loss of communication between the Body Electronic Control Module (BECM) and other control modules in the vehicle

Definition

The OBD2 code U2371: BECM Communication Failure indicates a loss of communication between the Body Electronic Control Module (BECM) and other control modules in the vehicle

Common causes

  • Faulty Body Control Module (BCM)
  • Faulty Engine Control Module (ECM)
  • Wiring issues or damaged connectors
  • Corroded terminals
  • Poor ground connections
  • Software or firmware issues
  • Intermittent electrical connections
  • Battery voltage issues

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or shorts in the communication lines
  • Defective sensors or actuators
  • Power supply problems to the BECM
  • Software or firmware issues in the BECM
  • Corroded or loose connectors
  • Issues with the vehicle's network (CAN bus)

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context about the issue

  2. 2. Inspect Wiring and Connectors

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

  3. 3. Continuity Test

    Use a multimeter to test for continuity in the wiring between the BECM and the other modules it communicates with

  4. 4. Check Power and Ground

    Ensure that the BECM is receiving the correct voltage and that the ground connections are secure. Use a multimeter to measure voltage at the BECM connector

  5. 5. Inspect the BECM

    If the wiring and connections are intact, the BECM itself may be faulty. Check for any signs of physical damage or water intrusion

  6. 6. If possible, test the BECM in another vehicle to confirm its functionality

  7. 7. Check Communication Lines

    Use a scan tool to monitor the communication lines (CAN bus) for activity. If there is no communication, there may be a fault in the bus itself

  8. 8. Look for any short circuits or open circuits in the communication lines

  9. 9. Reset the Codes

    Clear the trouble codes using the OBD-II scanner and see if the code returns after a short drive. If it does, further investigation is needed

  10. 10. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update for the BECM or other related modules. Check with the manufacturer for any available updates

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U2371 code or BECM communication issues for your specific vehicle make and model. Manufacturers may have specific fixes or recommendations

  12. 12. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with your vehicle.Conclusion Troubleshooting a U2371 code involves a systematic approach to check for wiring issues, module functionality, and communication integrity. Following these steps can help identify the root cause of the communication failure with the BECM