U2371 – BECM Communication Failure

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

The severity of ODBII code U2371: BECM Communication Failure is generally considered moderate to severe.

Common Causes For: U2370 Control Module Communication Bus Off.

• 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 misdiagnosis for U2371 U2371: BECM Communication Failure

• 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)

Common Troubleshooting Steps

The OBD-II code U2371 indicates a communication failure with the Body Electronic Control Module (BECM). This can be caused by various issues, including wiring problems, module failures, or communication protocol issues. Here are some common troubleshooting steps to diagnose and resolve the U2371 code:

• 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.
• 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.
• **Continuity Test: Use a multimeter to test for continuity in the wiring between the BECM and the other modules it communicates with.
• 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.
• 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.
• If possible, test the BECM in another vehicle to confirm its functionality.
• 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.
• Look for any short circuits or open circuits in the communication lines.
• 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.
• 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.
• 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.
• 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.