WOMS
C code chassis Medium severity

C1820 Air Suspension RF Air Compress Request Exceeded Max Timing

The OBD2 code C1820 indicates that the air suspension system's right front air compressor has exceeded the maximum allowable time for a request to operate, suggesting a potential issue with the compressor or the air...

Definition

The OBD2 code C1820 indicates that the air suspension system's right front air compressor has exceeded the maximum allowable time for a request to operate, suggesting a potential issue with the compressor or the air suspension system's control

Common causes

  • Faulty air suspension compressor
  • Leaking air springs or lines
  • Blocked air lines or filters
  • Malfunctioning height sensors
  • Electrical issues (wiring or connectors)
  • Faulty control module
  • Incorrectly calibrated suspension system
  • Excessive load on the vehicle

Common misdiagnoses

  • Faulty air suspension compressor
  • Air suspension relay issues
  • Wiring or connector problems
  • Air leaks in the suspension system
  • Faulty height sensors
  • Control module malfunctions
  • Incorrectly calibrated suspension system
  • Low air pressure in the system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues affecting the air suspension system

  2. 2. Inspect the Air Suspension System

  3. 3. Visual Inspection

    Look for any visible signs of damage or wear in the air suspension components, including air lines, bags, and the compressor

  4. 4. Check for Leaks

    Inspect the air bags and lines for leaks. A leak can cause the compressor to work harder and exceed its timing limits

  5. 5. Test the Air Compressor

  6. 6. Operation Check

    Listen for the compressor operation. It should run when the system is activated. If it does not run, it may be faulty

  7. 7. Voltage and Ground

    Use a multimeter to check for proper voltage and ground at the compressor connector. Ensure that the compressor is receiving the correct voltage when requested

  8. 8. Examine the Relay and Fuses

    Check the relay and fuses associated with the air suspension system. A faulty relay or blown fuse can prevent the compressor from operating correctly

  9. 9. Check the Suspension Control Module

    The control module may be malfunctioning. Inspect the module for any signs of damage or corrosion. If necessary, perform a reset or reprogramming of the module

  10. 10. Inspect the Height Sensors

    The height sensors monitor the vehicle's ride height. If they are faulty or misaligned, they can send incorrect signals to the control module, causing the compressor to run excessively

  11. 11. Check for Blockages

    Ensure that there are no blockages in the air lines or filters that could restrict airflow to the compressor

  12. 12. Perform a System Calibration

    If the system has been serviced or components have been replaced, it may require recalibration to ensure proper operation

  13. 13. Consult Technical Service Bulletins (TSBs)

    Check 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

  14. 14. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or a dealership with experience in air suspension systems. They may have specialized tools and knowledge to diagnose the problem accurately. By following these troubleshooting steps, you should be able to identify the cause of the C1820 code and take appropriate action to resolve the issue