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U1916U1916: "Module Communication Failure

The OBD2 code U1916 indicates a "Module Communication Failure," meaning there is a problem with communication between the vehicle's control modules, which may affect their ability to exchange data properly

Definition

The OBD2 code U1916 indicates a "Module Communication Failure," meaning there is a problem with communication between the vehicle's control modules, which may affect their ability to exchange data properly

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
  • Software issues or updates needed
  • Power supply problems
  • Grounding issues
  • Intermittent communication issues
  • Other module failures in the network
  • Corrupted data or configuration settings

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 by swapping it with a known good module (if available) to see if the problem persists

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

  11. 11.Check for Communication

  12. 12.Use a scan tool to check if the affected module is communicating with other modules. If it is not, there may be a fault in the module itself or in the communication network

  13. 13.You can also use a scope or a scan tool to monitor the communication lines (CAN bus) for proper signals

  14. 14.Inspect the CAN Bus

  15. 15.If the vehicle uses a Controller Area Network (CAN) for communication, check the integrity of the CAN bus wiring. Look for shorts, opens, or interference

  16. 16.Use a multimeter to measure the resistance of the CAN bus lines. They should typically show a specific resistance value (usually around 60 ohms)

  17. 17.Check for Software Updates

  18. 18.Sometimes, communication issues can be resolved with a software update. Check with the vehicle manufacturer for any available updates for the affected module(s)

  19. 19.Clear Codes and Test Drive

  20. 20.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

  21. 21.Consult Technical Service Bulletins (TSBs)

  22. 22.Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to module communication

  23. 23.Seek Professional Help

  24. 24.If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these troubleshooting steps, you can systematically identify and resolve the underlying cause of the U1916 code