WOMS
C code chassis Medium severity

C1874 Air Suspension RF Air Spring Solenoid Output Circuit Open

The OBD2 code C1874 indicates that there is an open circuit in the right front air spring solenoid output, which means the solenoid is not receiving the proper electrical signal to operate, potentially affecting the air...

Definition

The OBD2 code C1874 indicates that there is an open circuit in the right front air spring solenoid output, which means the solenoid is not receiving the proper electrical signal to operate, potentially affecting the air suspension system's performance

Common causes

  • Faulty air spring solenoid
  • Open circuit or damaged wiring
  • Poor electrical connections
  • Failed air suspension control module
  • Blown fuse
  • Corroded connectors

Common misdiagnoses

  • Faulty air spring
  • Defective air suspension compressor
  • Damaged wiring or connectors
  • Malfunctioning air suspension control module
  • Incorrectly calibrated height sensors
  • Air leaks in the suspension system
  • Faulty relay or fuse related to the air suspension system

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the air suspension system and the C1874 code

  2. 2. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors associated with the right front air spring solenoid. Look for any signs of damage, corrosion, or loose connections

  3. 3. Air Spring Assembly

    Check the air spring assembly for any visible damage or leaks

  4. 4. Scan Tool Diagnosis

    Use an OBD-II scanner to confirm the C1874 code and check for any additional codes that may provide more context

  5. 5. Clear the code and see if it returns after a short drive

  6. 6. Test the Solenoid

    Resistance Check: Measure the resistance of the right front air spring solenoid using a multimeter. Compare the reading to the specifications in the service manual

  7. 7. Power Supply Check

    With the ignition on, check for voltage at the solenoid connector. If there is no voltage, trace back to the control module

  8. 8. Inspect the Control Module

    If the solenoid tests good, the issue may lie with the air suspension control module. Check for any fault codes in the module and inspect for proper operation

  9. 9. Ensure that the module is receiving power and ground

  10. 10. Check for Ground Issues

    Ensure that the ground connections for the air suspension system are clean and secure. A poor ground can lead to circuit issues

  11. 11. Look for Short Circuits

    Inspect the wiring for any signs of short circuits or pinched wires that could cause an open circuit condition

  12. 12. Test the Air Suspension System

    If applicable, perform a system calibration or reset using a scan tool to ensure the air suspension system is functioning correctly

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the air suspension system for your specific vehicle make and model. There may be known issues or recalls that could be relevant

  14. 14. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in air suspension systems.Conclusion By following these troubleshooting steps, you should be able to identify the cause of the C1874 code and take appropriate action to resolve the issue. Always ensure safety precautions are taken when working on vehicle electrical systems