CAB 524018.31 – Left-Hand Reverser Neutral/Park Transition Fault

CAB 524018.31 (CAB )

Code: 524018.31



The error code CAB 524018.31 indicates that the CAB control unit has detected a fault during the transition between neutral and park positions using the left-hand reverser lever. This could be due to improper signaling, mechanical hang-ups, or electrical issues within the lever mechanism or its control circuitry, leading to uncertainty or failure in achieving or recognizing the intended gear position.


To prevent unintentional vehicle movement and ensure safety, the control unit commands the vehicle into a ‘PARK’ position, which is recoverable once the fault is addressed and the system is properly reset.


  • Inspect Mechanical Operation of the Lever: Check the left-hand reverser lever for any mechanical issues such as binding, sticking, or improper alignment that could hinder smooth transitioning between gear positions.
  • Test Lever and Sensor Functionality: Use diagnostic equipment to test the functionality of the sensors and switches associated with the reverser lever to ensure they are accurately reporting the lever’s position to the control unit.
  • Check Electrical Wiring and Connectors: Examine all related wiring and connectors for signs of wear, damage, or loose connections that could affect signal transmission between the reverser lever and the control unit.
  • Replace or Repair Faulty Components: If any components of the reverser system are found to be faulty, replace or repair them to restore proper function and reliability.
  • Recalibrate the Reverser System: After any repairs or replacements, recalibrate the system to ensure that the reverser lever accurately communicates its position to the control unit.
  • Reset and Test the System: Reset the control unit to clear any fault codes and test the vehicle to ensure that the neutral to park transition is functioning smoothly and the vehicle responds correctly to all reverser lever positions.


Regular checks and maintenance of the vehicle’s transmission and control systems are vital to detect early signs of wear or failure, particularly in components critical to vehicle operation and safety such as the reverser lever. Ensuring that these components function correctly can prevent operational issues and enhance the safety and reliability of the equipment.

Control Units: John Deere

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