BCU 523751.05 – M08 Stepper Motor for Hitch (Coil 1), Open Circuit. John Deere System Advisory.

BCU 523751.05 (BCU )

Code: 523751.05



Error code BCU 523751.05 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects abnormally high voltage at the output to the stepper motor for the hitch (coil 1) on leads 7058 and 7059. This diagnostic trouble code indicates an open circuit within the wiring or connections, which disrupts the current flow necessary for proper operation of the stepper motor.


The open circuit condition prevents the stepper motor coil 1 from functioning, which can impair the hitch’s ability to adjust and maintain proper positioning. This could affect various tasks that rely on the hitch, such as towing or operating implements, leading to decreased operational efficiency and potential impacts on performance.


  • Inspect Wiring and Connections: Check the connections and wiring associated with leads 7058 and 7059 for any signs of disconnection, damage, or wear that could have led to the open circuit.
  • Test Electrical Continuity: Use a multimeter to verify electrical continuity in the wires leading to coil 1 of the stepper motor. This helps to confirm the presence of an open circuit and locate its position.
  • Repair or Replace Faulty Wiring: If any breaks or damage are found within the circuit, repair or replace the affected wiring to restore proper electrical connectivity.
  • Check Stepper Motor Functionality: Ensure that the stepper motor itself is not the cause of the high voltage reading by testing its operational integrity. Replace the motor if it is found to be defective.
  • Reset the BCU: After repairs are completed, reset the BCU to clear the diagnostic trouble code and reinitialize the system, ensuring that all changes are recognized and the system functions as intended.
  • Test Hitch Operation: Conduct operational tests to confirm that the hitch and its stepper motor are functioning correctly following the repairs. This should include verifying that the hitch moves smoothly and maintains its position as required.
  • Implement Regular Maintenance: Integrate regular maintenance checks for the electrical and mechanical systems associated with the hitch and stepper motors. Preventative maintenance can help catch issues before they lead to more significant problems.


Maintaining the mechanical and electrical integrity of key components like hitch stepper motors is essential for the smooth operation of agricultural machinery. Regular inspections and timely repairs ensure that equipment performs reliably and continues to meet operational demands efficiently.