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U code network High severity

U0119 Lost Communication With Fuel Cell Control Module

The OBD2 code U0119 indicates a loss of communication between the vehicle's main control module and the fuel cell control module, which can affect the operation of the fuel cell system

Definition

The OBD2 code U0119 indicates a loss of communication between the vehicle's main control module and the fuel cell control module, which can affect the operation of the fuel cell system

Common causes

  • Faulty fuel cell control module
  • Damaged wiring or connectors
  • Poor electrical connections
  • Faulty communication lines
  • Software issues or bugs
  • Battery or power supply problems
  • Corrosion or dirt in connectors
  • Faulty or malfunctioning sensors

Common misdiagnoses

  • Faulty fuel cell control module
  • Wiring issues or damaged connectors
  • Faulty battery management system
  • Communication issues with other control modules
  • Faulty powertrain control module (PCM)
  • Incorrectly diagnosed fuel system issues
  • Battery or charging system problems
  • Software or firmware issues in control modules

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide more context for the issue

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors related to the fuel cell control module. Look for signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely attached and that there are no broken wires

  5. 5. Check the Fuel Cell Control Module

  6. 6. If possible, test the fuel cell control module itself. This may involve checking for proper voltage and ground at the module

  7. 7. If the module is removable, consider swapping it with a known good unit to see if the problem persists

  8. 8. Inspect the CAN Bus

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

  10. 10. Use a multimeter or oscilloscope to check for proper communication signals on the CAN bus

  11. 11. Check for Software Updates

  12. 12. Sometimes, manufacturers release software updates that can resolve communication issues. Check with the vehicle manufacturer for any available updates for the fuel cell control module or the vehicle's ECU

  13. 13. Battery and Power Supply Check

  14. 14. Ensure that the vehicle's battery is in good condition and fully charged. Low voltage can cause communication issues

  15. 15. Check the fuses related to the fuel cell control module and the communication network

  16. 16. Clear Codes and Test Drive

  17. 17. After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  18. 18. Take the vehicle for a test drive to see if the code reappears. Monitor the vehicle's performance and any warning lights

  19. 19. Consult Technical Service Bulletins (TSBs)

  20. 20. Look for any TSBs related to the U0119 code or the fuel cell control module for your specific vehicle make and model. These bulletins may provide additional guidance or known fixes

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who specializes in hybrid or electric vehicles for further diagnosis. By following these steps, you can systematically identify and resolve the issue associated with the U0119 code