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U code network Medium severity

U1914 U1914: "Module Communication Failure

The OBD2 code U1914 indicates a "Module Communication Failure," meaning there is a problem with communication between the vehicle's control modules, often due to a fault in the wiring, connectors, or the modules...

Definition

The OBD2 code U1914 indicates a "Module Communication Failure," meaning there is a problem with communication between the vehicle's control modules, often due to a fault in the wiring, connectors, or the modules themselves

Common causes

  • Faulty wiring or connectors
  • Failed or malfunctioning control module
  • Poor ground connections
  • Corroded or damaged pins in connectors
  • Intermittent electrical issues
  • Software or firmware issues in the module
  • Low battery voltage or power supply issues
  • Communication network issues (e.g., CAN bus problems)

Common misdiagnoses

  • Faulty wiring or connectors
  • Defective control module
  • Battery or power supply issues
  • Software or firmware glitches
  • Incorrectly configured or programmed modules
  • Intermittent communication issues
  • Grounding problems
  • Other communication protocol failures

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors associated with the affected module(s). Look for signs of damage, corrosion, or loose connections

  4. 4. Pay special attention to the wiring harnesses that connect the modules, as these can be prone to wear and tear

  5. 5. Check Power and Ground

  6. 6. Ensure that the affected module has a proper power supply and ground connection. Use a multimeter to check for voltage at the module's power and ground pins

  7. 7. If there is no power or ground, trace the wiring back to the source to identify any breaks or shorts

  8. 8. Test the Module

  9. 9. If possible, test the affected module to ensure it is functioning correctly. This may involve bench testing or swapping with a known good module

  10. 10. Some modules may have self-diagnostic capabilities that can provide additional information

  11. 11. Inspect the CAN Bus

  12. 12. The communication between modules often occurs over a Controller Area Network (CAN) bus. Check the integrity of the CAN bus wiring and connections

  13. 13. Use an oscilloscope or a CAN bus scanner to monitor the bus for proper communication signals

  14. 14. Check for Interference

  15. 15. Look for any aftermarket devices or modifications that may interfere with the vehicle's communication network. This includes alarms, stereo systems, or other electronic devices

  16. 16. Reset the Codes

  17. 17. After performing any repairs or adjustments, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  18. 18. Consult Technical Service Bulletins (TSBs)

  19. 19. Check for any manufacturer-specific TSBs related to the U1914 code. There may be known issues or recalls that could provide guidance on resolving the problem

  20. 20. Professional Diagnosis

  21. 21. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle make and model. By following these steps, you can systematically diagnose and potentially resolve the U1914 code related to module communication failure