WOMS
U code network Medium severity

U0128 Lost Communication With Park Brake Control Module

The OBD2 code U0128 indicates that there is a loss of communication between the vehicle's control module and the park brake control module, which may affect the functionality of the parking brake system

Definition

The OBD2 code U0128 indicates that there is a loss of communication between the vehicle's control module and the park brake control module, which may affect the functionality of the parking brake system

Common causes

  • Faulty Park Brake Control Module
  • Damaged wiring or connectors
  • Corroded terminals
  • Blown fuse
  • Faulty vehicle communication network (CAN bus)
  • Software issues or glitches
  • Low battery voltage or poor battery connections
  • Intermittent electrical connections

Common misdiagnoses

  • Faulty Park Brake Control Module
  • Wiring issues or shorts in the harness
  • Faulty ABS module
  • Faulty Engine Control Module (ECM)
  • Faulty Body Control Module (BCM)
  • Corroded connectors
  • Software issues or updates needed
  • Battery or power supply problems
  • Faulty brake switch
  • Issues with the vehicle's CAN bus 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. This can provide more context and help identify related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the park brake 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 or corroded

  4. 4. Test the Park Brake Control Module

    If accessible, test the park brake control module for proper operation. This may involve checking for power and ground at the module

  5. 5. Use a multimeter to measure voltage and ground at the module's connector

  6. 6. Check for Communication Issues

    Use a scan tool to check if the park brake control module is communicating with other modules in the vehicle. If it is not, there may be a communication fault

  7. 7. Inspect the CAN (Controller Area Network) bus wiring for shorts, opens, or other issues

  8. 8. Inspect the Fuses

    Check the vehicle’s fuse box for any blown fuses that may affect the park brake control module or related systems

  9. 9. Perform a Hard Reset

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

  10. 10. Check for Software Updates

    Some vehicles may require software updates for the control modules. Check with the manufacturer or a dealership to see if any updates are available

  11. 11. Test Other Related Components

    If applicable, check other components related to the park brake system, such as the brake switch, to ensure they are functioning correctly

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the U0128 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. 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 your vehicle's specific systems.Conclusion By following these troubleshooting steps, you can systematically identify and address the cause of the U0128 code. Always ensure safety precautions are taken when working on a vehicle, and consult the vehicle’s service manual for specific details related to your make and model