WOMS
U code network Medium severity

U0147 Lost Communication With Gateway "B

The OBD2 code U0147 indicates a loss of communication with Gateway "B," which typically refers to a failure in communication between the vehicle's control modules, often affecting systems like the body control module or...

Definition

The OBD2 code U0147 indicates a loss of communication with Gateway "B," which typically refers to a failure in communication between the vehicle's control modules, often affecting systems like the body control module or other networked components

Common causes

  • Faulty Gateway Module
  • Damaged or corroded wiring/connectors
  • Poor ground connections
  • Malfunctioning control modules
  • Software issues or bugs
  • Battery or power supply problems
  • Intermittent electrical connections
  • Aftermarket modifications or installations

Common misdiagnoses

  • Faulty Gateway Module
  • Wiring Issues
  • Faulty Body Control Module (BCM)
  • Faulty Engine Control Module (ECM)
  • Faulty Transmission Control Module (TCM)
  • Corrupted Software/Firmware
  • Battery Voltage Issues
  • Grounding Problems
  • Faulty CAN Bus Communication
  • Other Communication Errors

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 and connectors associated with the Gateway module and any related control modules for signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    Repair any damaged wires or connectors and ensure all connections are secure

  4. 4. Check Power and Ground

    Verify that the Gateway module is receiving proper power and ground. Use a multimeter to check voltage at the module's power and ground pins

  5. 5. If there is no power, trace the circuit back to the fuse box and check for blown fuses or faulty wiring

  6. 6. Inspect the Gateway Module

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

  7. 7. If possible, test the module by swapping it with a known good module from a similar vehicle

  8. 8. Check for Software Updates

    Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer or a dealership to see if there are any available updates for the vehicle's control modules

  9. 9. Perform a Network Scan

    Use a professional-grade scan tool to perform a network scan of all control modules. This can help identify which module is not communicating and may provide more specific information about the issue

  10. 10. Clear Codes and Test Drive

    After performing any repairs or checks, clear the trouble codes and take the vehicle for a test drive to see if the code returns. Monitor the vehicle's systems to ensure everything is functioning properly

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U0147 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  12. 12. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or dealership for further diagnosis. They may have access to specialized tools and knowledge to resolve complex communication issues. By following these troubleshooting steps, you can systematically identify and address the underlying cause of the U0147 code