WOMS
U code network High severity

U1132 Lost Communication with Body Control Module (BCM)"

The OBD2 code U1132 indicates that there is a communication failure 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 U1132 indicates that there is a communication failure 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
  • Corroded terminals
  • Poor ground connection
  • Faulty communication network (CAN bus)
  • Blown fuses
  • Software issues or programming errors
  • Intermittent electrical issues

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or shorts in the communication lines
  • Faulty or corroded connectors
  • Issues with the power supply to the BCM
  • Problems with other control modules
  • Software or firmware issues in the BCM
  • Faulty fuses related to the BCM
  • Grounding issues in the vehicle's electrical system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  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 or corroded

  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 Communication: 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 levels on the communication lines

  10. 10. Check for Short Circuits

    Inspect the wiring for any short circuits that may be affecting 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 may 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. If it does, further investigation is needed

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have known issues or specific fixes for the U1132 code

  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 automotive technician who has experience with the specific vehicle and its systems. By following these steps, you should be able to identify the root cause of the U1132 code and take appropriate action to resolve the communication issue with the Body Control Module