WOMS
C code chassis Medium severity

C0655 Level Control Compressor Relay Malfunction

The OBD2 code C0655 indicates a malfunction in the level control compressor relay, which is responsible for controlling the air suspension system's compressor

Definition

The OBD2 code C0655 indicates a malfunction in the level control compressor relay, which is responsible for controlling the air suspension system's compressor

Common causes

  • Faulty level control compressor relay
  • Wiring issues (shorts, opens, or corrosion)
  • Failed level control compressor
  • Malfunctioning level sensor
  • Faulty control module
  • Poor ground connections
  • Blown fuses
  • Software issues in the control module

Common misdiagnoses

  • Faulty level control compressor
  • Bad wiring or connectors
  • Defective level control module
  • Air suspension system issues
  • Low refrigerant levels
  • Faulty pressure sensors
  • Incorrectly calibrated height sensors
  • Battery or charging system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring and connectors associated with the level control compressor and relay. Look for signs of damage, corrosion, or loose connections that could affect the relay's operation

  3. 3. Test the Relay

    Remove the level control compressor relay and test it using a multimeter. Check for continuity and ensure that it operates correctly when energized. If the relay is faulty, replace it

  4. 4. Check the Compressor

    Inspect the level control compressor itself for any signs of damage or malfunction. Ensure that it is receiving power and ground signals as expected. If the compressor is not functioning, it may need to be repaired or replaced

  5. 5. Examine the Level Sensors

    The level control system often relies on sensors to determine the vehicle's height. Check the level sensors for proper operation and ensure they are not damaged or misaligned

  6. 6. Inspect the Fuses

    Check the fuses related to the level control system and the compressor relay. A blown fuse can prevent the relay from functioning properly

  7. 7. Test the Control Module

    If all other components appear to be functioning correctly, the issue may lie within the control module that manages the level control system. Testing or reprogramming the module may be necessary

  8. 8. Check for Ground Issues

    Ensure that all ground connections related to the level control system are secure and free of corrosion. Poor grounding can lead to erratic behavior

  9. 9. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code reappears