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U code network High severity

U0145 Lost Communication With Body Control Module "E

The OBD2 code U0145 indicates a loss of communication with the Body Control Module "E," which may result from issues such as wiring problems, module failure, or communication network faults

Definition

The OBD2 code U0145 indicates a loss of communication with the Body Control Module "E," which may result from issues such as wiring problems, module failure, or communication network faults

Common causes

  • Faulty Body Control Module (BCM)
  • Damaged wiring or connectors
  • Corroded terminals
  • Poor ground connections
  • Faulty communication network (CAN bus issues)
  • Software or firmware issues
  • Battery or power supply problems
  • Intermittent electrical connections

Common misdiagnoses

  • Faulty Body Control Module (BCM)
  • Wiring issues or damaged connectors
  • Faulty Instrument Cluster
  • Faulty Powertrain Control Module (PCM)
  • Battery or charging system problems
  • Faulty CAN bus communication
  • Grounding issues
  • Software or firmware issues in the BCM or other modules

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Other codes may provide more context or indicate related issues

  2. 2. Inspect Wiring and Connectors

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

    Verify that the Body Control Module is receiving the correct power supply and ground. Use a multimeter to check voltage at the module's power and ground pins

  5. 5. Test the Body Control Module

    If possible, test the Body Control Module for proper operation. This may involve using a scan tool to communicate with the module or replacing it with a known good unit for testing

  6. 6. Inspect the CAN Bus

    The communication between modules typically occurs over a Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts, opens, or interference

  7. 7. Use an oscilloscope or a CAN bus tester to monitor the communication signals on the bus

  8. 8. Check for Software Updates

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

  9. 9. Look for Environmental Factors

    Consider any recent changes or repairs made to the vehicle that could have affected the wiring or modules, such as bodywork, electrical repairs, or water intrusion

  10. 10. Perform a Hard Reset

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

  11. 11. 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 U0145

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its electronic systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U0145 code