WOMS
C code chassis Medium severity

C1870 Air Suspension Gate Solenoid Output Circuit Open

The OBD2 code C1870 indicates that there is an open circuit in the air suspension gate solenoid output, meaning the solenoid is not receiving the proper electrical signal to operate, which can affect the air suspension...

Definition

The OBD2 code C1870 indicates that there is an open circuit in the air suspension gate solenoid output, meaning the solenoid is not receiving the proper electrical signal to operate, which can affect the air suspension system's functionality

Common causes

  • Faulty air suspension gate solenoid
  • Open or damaged wiring in the circuit
  • Poor electrical connections or corroded terminals
  • Failed air suspension control module
  • Blown fuse related to the air suspension system
  • Grounding issues in the circuit

Common misdiagnoses

  • Faulty air suspension compressor
  • Defective air suspension control module
  • Wiring issues or shorts in the harness
  • Bad ground connections
  • Faulty air suspension solenoid
  • Incorrectly calibrated height sensors
  • Air leaks in the suspension system
  • Battery or charging system problems

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 C1870 code. This can provide insights into the expected operation and circuit diagrams

  2. 2. Visual Inspection

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

  3. 3. Solenoid Condition

    Check the air suspension gate solenoid for physical damage or wear

  4. 4. Check Fuses

    Inspect the fuses related to the air suspension system. A blown fuse can cause an open circuit and trigger the C1870 code

  5. 5. Test the Solenoid

    Resistance Test: Use a multimeter to measure the resistance of the air suspension gate solenoid. Compare the reading to the specifications in the service manual

  6. 6. Power and Ground

    Check for proper voltage and ground at the solenoid connector when the system is activated. If there is no power or ground, trace the circuit back to the control module

  7. 7. Inspect the Control Module

    If the solenoid and wiring appear to be in good condition, the issue may lie within the control module. Check for any fault codes in the control module that may provide additional context

  8. 8. Perform a reset of the control module if applicable, and see if the code returns

  9. 9. Check for Other Codes

    Scan for any additional trouble codes that may be related to the air suspension system. Sometimes, multiple codes can provide a clearer picture of the issue

  10. 10. Test the Air Suspension System

    If applicable, perform a functional test of the air suspension system to ensure it operates correctly. This may involve checking the compressor, air lines, and other components

  11. 11. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the air suspension system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  12. 12. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or technician who has experience with air suspension systems. They may have specialized tools and knowledge to diagnose the problem more effectively

  13. 13. Clear the Code

    After repairs or adjustments, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns. By following these steps, you should be able to identify the cause of the C1870 code and take appropriate action to resolve the issue