BCU 523701.06 – M08 Stepper Motor for Hitch (Coil 2), Current Too High. John Deere System Advisory.

BCU 523701.06 (BCU )

Code: 523701.06



Error code BCU 523701.06 is activated when the Basic Control Unit (BCU) of a John Deere vehicle detects that the current at the outputs to the stepper motor for the hitch (coil 2) on leads 7054 and 7055 is excessively high, suggesting a short to ground within the circuit. This condition can lead to overheating, potential damage to the stepper motor or control unit, and could pose a fire hazard if not promptly addressed.


The system may respond by limiting or shutting down power to the affected circuit to prevent damage to the stepper motor and other components. This protective action, while necessary, will impair the hitch’s operational capabilities, potentially affecting the tractor’s performance.


  • Inspect Wiring and Connections: Thoroughly examine the wiring and connectors for leads 7054 and 7055. Look for any signs of damage, wear, or fraying that could contribute to a short circuit.
  • Measure Current Flow: Utilize a clamp meter or multimeter to measure the current flow through the specified leads to confirm the overcurrent condition.
  • Identify and Repair Short Circuits: Locate any shorts to ground within the circuit and make necessary repairs. This may involve replacing damaged wires or connectors, and ensuring all wiring is correctly insulated and routed to prevent future shorts.
  • Check Stepper Motor Coil: Inspect the stepper motor, particularly coil 2, for signs of damage or malfunction that could be causing the high current draw. Replace the motor if it is found to be faulty.
  • Reset the BCU: After addressing the short circuit and making any necessary repairs or replacements, reset the BCU to clear the diagnostic trouble code and reinitialize the system settings.
  • Test Hitch Operation: Conduct a functional test of the hitch control system to ensure that the stepper motor operates smoothly and correctly. This test will help verify that the issue has been fully resolved.
  • Ongoing Monitoring and Maintenance: Continue to monitor the system closely, especially the repaired circuit, to ensure no recurring issues. Include regular inspections in the maintenance schedule to detect and resolve potential problems before they lead to system failures.


Regular maintenance and proactive management of electrical systems are crucial in agricultural machinery. Ensuring that all components function within their designed parameters is key to maintaining operational efficiency and safety. Addressing electrical issues like shorts promptly not only prevents damage to expensive components but also safeguards against operational hazards.