WOMS
C code chassis High severity

C1868 Air Suspension Rear Inflator Solenoid Output Circuit Short To Ground

The OBD2 code C1868 indicates a short circuit in the air suspension rear inflator solenoid output circuit, meaning there is an unintended connection to ground that may affect the solenoid's operation

Definition

The OBD2 code C1868 indicates a short circuit in the air suspension rear inflator solenoid output circuit, meaning there is an unintended connection to ground that may affect the solenoid's operation

Common causes

  • Damaged wiring or connectors
  • Shorted solenoid
  • Faulty air suspension control module
  • Corroded terminals
  • Grounding issues
  • Water intrusion in electrical components
  • Improper installation or modifications

Common misdiagnoses

  • Faulty air suspension compressor
  • Damaged wiring or connectors
  • Defective air suspension control module
  • Incorrectly diagnosed air spring or bag issues
  • Faulty relay or fuse related to the air suspension system
  • Misinterpretation of other suspension-related codes
  • Air suspension height sensor issues

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the C1868 code

  2. 2. Check for any additional codes that may provide more context or related issues

  3. 3. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the air suspension system, particularly those leading to the rear inflator solenoid

  4. 4. Look for Damage

    Look for frayed wires, corrosion, or any signs of wear that could cause a short to ground

  5. 5. Connector Condition

    Ensure that all connectors are secure and free from moisture or dirt

  6. 6. Check for Shorts to Ground

    Multimeter Testing: Use a multimeter to check for continuity between the solenoid circuit and ground. A reading of zero ohms indicates a short

  7. 7. Isolate the Circuit

    Disconnect the solenoid and check the circuit again to see if the short persists. If the short disappears, the solenoid may be faulty

  8. 8. Test the Solenoid

    Bench Test: If possible, remove the solenoid and test it outside the vehicle to see if it operates correctly

  9. 9. Resistance Check

    Measure the resistance of the solenoid coil. Compare the reading to the manufacturer’s specifications

  10. 10. Inspect the Air Suspension Control Module

    Module Functionality: Check if the air suspension control module is functioning properly. Look for any signs of damage or corrosion

  11. 11. Software Updates

    Ensure that the vehicle’s software is up to date, as some issues may be resolved with a software update

  12. 12. Check Fuses and Relays

    Inspect the fuses and relays associated with the air suspension system. Replace any blown fuses and test the relays for proper operation

  13. 13. Look for Other Related Issues

    Ground Connections: Ensure that all ground connections related to the air suspension system are clean and secure

  14. 14. Other Components

    Check other components in the air suspension system for faults, as they may contribute to the issue

  15. 15. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the code using the OBD-II scanner

  16. 16. Take the vehicle for a test drive to see if the code reappears

  17. 17. 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 fixes

  18. 18. Seek Professional Help

    If the issue persists after following these steps, consider consulting a professional mechanic or technician who specializes in air suspension systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1868 code. Always refer to the vehicle’s service manual for specific procedures and specifications