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

BCU 523751.05 (BCU )

Code: 523751.05



The diagnostic trouble code BCU 523751.05 is triggered when the Body Control Unit (BCU) detects abnormally high voltage at the output to the stepper motor for the hitch (coil 1), specifically in leads 7058 and 7059. This high voltage condition typically indicates an open circuit, which means there is a disconnection or break in the circuit that prevents normal operation of the stepper motor used for hitch control.


The BCU will likely deactivate the hitch control to prevent potential damage or erratic operation due to the open circuit, and it may alert the operator through a fault indicator on the dashboard.


  • Inspect Wiring and Connectors: Examine the wiring and connectors associated with leads 7058 and 7059 for signs of damage, wear, or disconnection. Focus on identifying areas where the circuit could be broken or disconnected.
  • Test for Continuity: Use a multimeter to check for continuity in the circuit. A lack of continuity confirms the presence of an open circuit.
  • Repair or Replace Faulty Wiring: If any breaks or disconnections are found, repair or replace the faulty wiring or connectors to restore electrical connectivity.
  • Check Stepper Motor Functionality: After addressing the wiring issues, test the stepper motor to ensure it operates correctly. Replace the motor if it shows signs of damage or malfunction.
  • Reset the System: Clear the diagnostic trouble code from the BCU and perform a system reset if necessary to ensure all systems are functioning normally.


Regular maintenance and checks of the electrical system, particularly wiring integrity and connector security, are crucial for the reliable operation of machinery. This helps prevent issues like open circuits, which can lead to operational inefficiencies and potential safety hazards. Proactive troubleshooting and repair are key to maintaining the proper function of all solenoid-controlled systems.