WOMS
U code network High severity

U011D Lost Communication With All Wheel Drive Control Module

The OBD2 code U011D indicates a loss of communication between the vehicle's control module and the All Wheel Drive (AWD) control module, suggesting a potential issue with wiring, connectors, or the AWD module itself

Definition

The OBD2 code U011D indicates a loss of communication between the vehicle's control module and the All Wheel Drive (AWD) control module, suggesting a potential issue with wiring, connectors, or the AWD module itself

Common causes

  • Faulty All Wheel Drive Control Module
  • Damaged wiring or connectors
  • Poor electrical connections
  • Blown fuse
  • Corroded terminals
  • Software issues or glitches
  • Faulty vehicle speed sensor
  • Issues with the power supply to the module

Common misdiagnoses

  • Faulty All Wheel Drive Control Module
  • Wiring issues or damaged connectors
  • Faulty ABS module
  • Faulty Engine Control Module (ECM)
  • Faulty Transmission Control Module (TCM)
  • Battery or charging system issues
  • Faulty wheel speed sensors
  • Software or programming issues

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 related to the All Wheel Drive (AWD) 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 the All Wheel Drive Control Module

    Module Condition: Inspect the AWD control module for any physical damage or signs of water intrusion

  5. 5. Re-seat the Module

    Disconnect and reconnect the module to ensure a good connection

  6. 6. Test the Power and Ground

    Power Supply: Use a multimeter to check if the AWD control module is receiving the correct voltage

  7. 7. Ground Connection

    Ensure that the ground connections are secure and functioning properly

  8. 8. Inspect the CAN Bus System

    Communication Lines: Check the Controller Area Network (CAN) bus lines for continuity and integrity. Look for shorts, opens, or high resistance

  9. 9. Other Modules

    Ensure that other modules on the CAN bus are functioning correctly, as a failure in one module can affect communication

  10. 10. Perform a Network Test

    If available, use a scan tool to perform a network test to see if the AWD control module is communicating with other modules

  11. 11. Check for Software Updates

    Verify if there are any software updates available for the AWD control module or the vehicle’s ECU. Sometimes, manufacturers release updates to fix communication issues

  12. 12. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle, as there may be known issues or fixes for the U011D code

  14. 14. 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, as specialized equipment may be required. By following these steps, you can systematically troubleshoot the U011D code and identify the root cause of the communication issue with the All Wheel Drive control module