CCU 524235.05 – MFWD Solenoid Circuit Fault

CCU 524235.05 (CCU )

Code: 524235.05



This fault code indicates that the Chassis Control Unit (CCU) has detected a malfunction in the Mechanical Front-Wheel Drive (MFWD) solenoid driver or circuit. This can occur due to an open circuit, a short circuit, or an over-temperature condition. The fault is detected while the MFWD is disengaged, suggesting an issue with the solenoid’s ability to remain inactive or engage when required.


The functionality of the MFWD system is degraded to prevent potential damage or unsafe operation.


  • Inspect MFWD Solenoid and Wiring:
    • Check the MFWD solenoid for any signs of damage, wear, or overheating. Ensure the solenoid is functioning correctly.
    • Inspect the wiring harness connected to the solenoid for open circuits, shorts, or any physical damage. Repair or replace any faulty components.
  • Test Electrical Connections:
    • Use a multimeter to check for proper voltage and continuity in the MFWD solenoid circuit. Ensure there are no voltage drops or interruptions.
  • Check for Over-Temperature Conditions:
    • Verify that the solenoid is not experiencing over-temperature conditions. If overheating is detected, investigate possible causes such as excessive load or insufficient cooling.
  • Reset System and Monitor:
    • After making necessary repairs or replacements, reset the CCU and monitor the MFWD system to ensure the fault does not reoccur.


Regular maintenance and inspection of the MFWD system and its components can help prevent such faults and ensure reliable operation. Addressing electrical and mechanical issues promptly is crucial for maintaining system performance.

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