BCU 523701.05 – M08 Stepper Motor for Hitch (Coil 2), Open Circuit. John Deere System Advisory.

BCU 523701.05 (BCU )

Code: 523701.05



Error code BCU 523701.05 is activated when the Basic Control Unit (BCU) of a John Deere vehicle detects that the voltage at the outputs to the stepper motor for the hitch (coil 2) on leads 7054 and 7055 is abnormally high, indicating an open circuit. This diagnostic trouble code points to a discontinuity in the electrical path, which prevents current from flowing properly through the circuit, thereby disabling the functionality of the stepper motor for hitch control.


The hitch control system may fail to operate correctly, as the stepper motor (coil 2) cannot actuate without a complete circuit. This could affect the tractor’s ability to adjust the hitch positioning accurately, impacting performance and efficiency during operations that rely on precise hitch movement.


  • Inspect Wiring and Connections: Examine the wiring and connectors associated with leads 7054 and 7055 for any signs of disconnection, wear, or damage that could lead to an open circuit.
  • Measure Voltage and Continuity: Use a multimeter to verify the high voltage reading and to test for continuity in the circuit. This will help confirm the presence of an open circuit and identify its location.
  • Repair or Replace Faulty Wiring: If an open circuit is identified, repair the broken or disconnected wiring, or replace any faulty components. Ensure all connections are secure and properly insulated to restore electrical integrity.
  • Reset the BCU: After repairs are completed, reset the BCU to clear the diagnostic trouble code and to reinitialize the system, ensuring the stepper motor and hitch control resume normal operation.
  • Test Hitch Operation: Operate the hitch to ensure that the stepper motor (coil 2) functions correctly across its range of movement. Monitor the system to confirm stability and accuracy in the hitch’s performance.
  • Regular System Checks: Implement a routine inspection schedule for the electrical system, focusing on areas prone to wear and damage. Regular maintenance can prevent future issues and ensure the reliability of critical operational components like the hitch control system.


Maintaining the electrical and mechanical integrity of the hitch control system is crucial for the performance and operational safety of agricultural machinery. Ensuring that stepper motors and their control circuits are regularly checked and maintained is essential for preventing downtime and enhancing the machinery’s operational efficiency.