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U code network High severity

U013E Lost Communication with Body Control Module (BCM) 'A'

The OBD2 code U013E indicates that there is a loss of communication with the Body Control Module (BCM) 'A', which may affect various electrical systems in the vehicle

Definition

The OBD2 code U013E indicates that there is a loss of communication with the Body Control Module (BCM) 'A', which may affect various electrical 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 connections

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or shorts in the communication lines
  • Faulty or corroded connectors
  • Issues with the Powertrain Control Module (PCM)
  • Malfunctioning Instrument Cluster
  • Problems with the Anti-lock Braking System (ABS) module
  • Battery or charging system issues
  • Faulty fuses related to the BCM or communication circuits
  • Software or firmware issues in the BCM
  • Other communication network problems (e.g., CAN bus issues)

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2. Inspect 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 module

  5. 5. Ground Connections

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

  6. 6. Test the BCM

    If possible, test the BCM for functionality. This may involve using a scan tool to communicate with the module or replacing it with a known good unit to see if the issue persists

  7. 7. Inspect Related Modules

    Check for communication issues with other modules in the vehicle. If other modules are also having communication problems, it may indicate a network issue rather than a specific BCM problem

  8. 8. Check for Short Circuits

    Inspect the wiring for any short circuits that may be affecting communication. This can include checking for shorts to ground or power

  9. 9. Look for Software Issues

    Sometimes, a software update may be required for the BCM or other related modules. Check with the manufacturer for any available updates

  10. 10. Scan Tool Communication

    Use a professional-grade scan tool to attempt to communicate with the BCM. If communication is not possible, it may indicate a fault in the module or the communication network

  11. 11. Inspect the CAN Bus

    If the vehicle uses a Controller Area Network (CAN) for communication, check the CAN bus wiring for integrity. Look for any breaks or shorts in the bus lines

  12. 12. Reset the System

    After performing checks and repairs, clear the codes using the scan tool and see if the code returns after a test drive.1

  13. 13. 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.1

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these steps, you can systematically diagnose and address the U013E code and its underlying causes