WOMS
U code network Medium severity

U0199 Lost Communication With "Door Control Module A

The OBD2 code U0199 indicates a loss of communication with the Door Control Module A, which may affect the operation of the door-related functions in the vehicle

Definition

The OBD2 code U0199 indicates a loss of communication with the Door Control Module A, which may affect the operation of the door-related functions in the vehicle

Common causes

  • Faulty Door Control Module
  • Wiring issues (damaged, corroded, or loose connections)
  • Faulty connectors or terminals
  • Malfunctioning Body Control Module (BCM)
  • Software issues or programming errors
  • Blown fuses
  • Intermittent electrical issues
  • Grounding problems

Common misdiagnoses

  • Faulty Door Control Module
  • Wiring Issues
  • Faulty Body Control Module
  • Communication Network Problems
  • Faulty Power Supply to the Module
  • Corroded Connectors or Pins
  • Software Glitches or Updates Needed
  • Other Module Failures in the Communication Network

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 Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the door control module. Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely plugged in and that there are no bent pins

  5. 5. Test the Door Control Module

  6. 6. If possible, test the door control module itself. This may involve using a multimeter to check for proper voltage and ground at the module's connector

  7. 7. If you have access to a known good module, you can swap it out to see if the problem persists

  8. 8. Check for Power and Ground

  9. 9. Verify that the door control module is receiving power and ground. Use a multimeter to check the voltage at the module's connector

  10. 10. If there is no power, trace the wiring back to the fuse box and check for blown fuses or broken wires

  11. 11. Inspect the CAN Bus

  12. 12. The door control module communicates over the Controller Area Network (CAN) bus. Check for any issues with the CAN bus wiring, such as shorts or opens

  13. 13. Use a scan tool to monitor the CAN bus for communication errors

  14. 14. Look for Intermittent Issues

  15. 15. Sometimes, communication issues can be intermittent. Pay attention to when the code appears (e.g., during specific conditions like temperature changes or after certain actions)

  16. 16. Check for Software Updates

  17. 17. In some cases, manufacturers release software updates for control modules. Check if there are any updates available for the vehicle's software that may address communication issues

  18. 18. Perform a Hard Reset

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

  20. 20. Consult Technical Service Bulletins (TSBs)

  21. 21. Check for any TSBs related to the U0199 code for your specific vehicle make and model. Manufacturers may have identified common issues and provided solutions

  22. 22. Seek Professional Help

  23. 23. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle's electrical systems. By following these troubleshooting steps, you should be able to identify the root cause of the U0199 code and take appropriate action to resolve the communication issue with the door control module