WOMS
C code chassis Medium severity

C0657 Level Control Compressor Circuit Low

The OBD2 code C0657 indicates a malfunction in the level control compressor circuit, specifically that the circuit is reading a low voltage or current, which may affect the vehicle's air suspension system

Definition

The OBD2 code C0657 indicates a malfunction in the level control compressor circuit, specifically that the circuit is reading a low voltage or current, which may affect the vehicle's air suspension system

Common causes

  • Faulty level control compressor
  • Open or shorted wiring in the circuit
  • Poor electrical connections
  • Failed level control module
  • Low refrigerant levels
  • Malfunctioning pressure sensors
  • Grounding issues in the circuit

Common misdiagnoses

  • Faulty level control module
  • Defective air suspension compressor
  • Wiring issues or shorts in the circuit
  • Bad ground connections
  • Air suspension leaks
  • Faulty height sensors
  • Incorrectly calibrated suspension system
  • Malfunctioning body control module (BCM)

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Ensure the battery is fully charged and in good condition

  2. 2. Check the alternator output to ensure it is functioning properly

  3. 3. Inspect Fuses and Relays

    Check the fuses related to the level control system. Replace any blown fuses

  4. 4. Inspect the relays for the level control compressor and ensure they are functioning correctly

  5. 5. Visual Inspection of Wiring and Connectors

    Inspect the wiring harness and connectors associated with the level control compressor for any signs of damage, corrosion, or loose connections

  6. 6. Repair or replace any damaged wiring or connectors

  7. 7. Test the Level Control Compressor

    Use a multimeter to check the voltage at the level control compressor. Ensure it is receiving the correct voltage as specified in the service manual

  8. 8. If the compressor is not receiving power, trace the circuit back to find the fault

  9. 9. Check the Level Control Module

    If applicable, test the level control module for proper operation. This may involve checking for fault codes and ensuring it is communicating with the vehicle's computer

  10. 10. If the module is faulty, it may need to be reprogrammed or replaced

  11. 11. Inspect the Air Suspension System (if applicable)

    Check for leaks in the air suspension system, including air bags, lines, and fittings

  12. 12. Ensure that the air suspension system is functioning correctly and that the compressor is able to inflate the air bags as needed

  13. 13. Clear Codes and Test Drive

    After performing repairs, clear the trouble codes using an OBD-II scanner

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

  15. 15. Seek Professional Help

    If the issue persists after performing the above steps, consider seeking help from a qualified mechanic or technician who has experience with the specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C0657 code