WOMS
U code network Medium severity

U0174 Lost Communication With Restraints System Sensor E

The OBD2 code U0174 indicates a loss of communication with the Restraints System Sensor E, which may affect the vehicle's airbag and safety systems

Definition

The OBD2 code U0174 indicates a loss of communication with the Restraints System Sensor E, which may affect the vehicle's airbag and safety systems

Common causes

  • Faulty restraints system sensor E
  • Damaged wiring or connectors
  • Poor ground connection
  • Malfunctioning airbag control module
  • Software issues or updates needed
  • Corrosion or debris in connectors
  • Open or short circuit in the communication line

Common misdiagnoses

  • Faulty airbag control module
  • Wiring issues or shorts in the harness
  • Defective seat belt tensioner
  • Malfunctioning crash sensor
  • Issues with the body control module (BCM)
  • Faulty connectors or terminals
  • Software glitches in the vehicle's computer system
  • Battery or power supply problems

Troubleshooting steps

  1. 1. Check for Additional Codes

  2. 2. Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  3. 3. Inspect Wiring and Connectors

  4. 4. Visually inspect the wiring and connectors related to the restraints system sensor. Look for signs of damage, corrosion, or loose connections. Pay special attention to the connectors for the airbag module and the sensor itself

  5. 5. Check the Restraint System Sensor

  6. 6. If accessible, test the specific sensor (Sensor E) for proper operation. This may involve checking resistance or voltage as specified in the vehicle's service manual

  7. 7. Inspect the Airbag Module

  8. 8. Check the airbag control module for any signs of damage or corrosion. Ensure that it is securely connected and that there are no issues with the module itself

  9. 9. Test the Communication Network

  10. 10. Use a scan tool to check the communication between the airbag module and other modules in the vehicle. Ensure that the CAN (Controller Area Network) bus is functioning properly

  11. 11. Check for Short Circuits or Open Circuits

  12. 12. Use a multimeter to check for continuity in the wiring harness. Look for any short circuits or open circuits that could be causing the communication loss

  13. 13. Clear Codes and Test Drive

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

  15. 15. Consult Technical Service Bulletins (TSBs)

  16. 16. Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the restraints system

  17. 17. Professional Diagnosis

  18. 18. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex issues

  19. 19. Review Vehicle History

  20. 20. If the vehicle has been in an accident or had previous repairs related to the airbag system, review that history as it may provide clues to the current issue. Always remember to take appropriate safety precautions when working with airbag systems, as they can be dangerous if mishandled. If you're unsure about any step, it's best to consult a professional