CCU 524037.02 – MFWD Switch Circuit Fault

CCU 524037.02 (CCU )

Code: 524037.02



This fault code is triggered when the Chassis Control Unit (CCU) detects that the brake assist and auto switch inputs for the Mechanical Front-Wheel Drive (MFWD) system are both ON simultaneously for longer than 3 seconds. This condition indicates a malfunction or miscommunication within the MFWD switch circuit.


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


  • Inspect MFWD Switch and Circuit: Check the MFWD switch for proper operation and inspect the wiring and connections for any signs of damage, corrosion, or short circuits. Repair or replace as necessary.
  • Check Switch Inputs: Use diagnostic tools to verify the inputs from the brake assist and auto switch. Ensure that they are not simultaneously active when they should not be.
  • Reset and Test System: After addressing any issues with the switch or wiring, reset the CCU and test the MFWD system to ensure it operates correctly without triggering the fault code.
  • Monitor for Recurrence: Keep an eye on the system for any recurrence of the fault, which may indicate underlying issues that need further investigation.


Regular maintenance and checks of the MFWD system and its components can help prevent such issues and ensure reliable operation. Prompt attention to switch and wiring faults can maintain system integrity and performance.

Control Units: John Deere

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