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

BCU 523701.05 (BCU )

Code: 523701.05



The diagnostic trouble code BCU 523701.05 is generated when the Body Control Unit (BCU) detects abnormally high voltage at the output to the stepper motor for the hitch (coil 2), specifically in leads 7054 and 7055. This high voltage reading is indicative of an open circuit in the wiring or connections, preventing normal operation of the stepper motor which adjusts the hitch position.


To prevent potential damage from incorrect motor operation and to ensure safety, the system may disable the stepper motor function until the fault is corrected, impacting the control and adjustment capabilities of the hitch.


  • Inspect Wiring and Connectors: Examine the wiring and connectors associated with leads 7054 and 7055 for any signs of disconnection, breakage, or wear that could have caused the open circuit.
  • Test for Continuity: Use a multimeter to test for continuity in the circuit. Lack of continuity confirms the presence of an open circuit.
  • Repair or Replace Faulty Components: If specific areas of damage or malfunction are found, repair or replace the faulty wiring or connectors to restore circuit integrity.
  • Ensure Secure Connections: Verify that all connections are secure and properly engaged to prevent future occurrences of open circuits.
  • Reset the System and Test Operation: After repairs, reset any fault codes and test the stepper motor operation to ensure that the hitch is functioning correctly and responding to control inputs.


Regular maintenance and routine inspection of electrical and mechanical components related to hitch operation are vital for reliable performance. Prompt attention to and resolution of diagnostic codes like BCU 523701.05 help maintain operational efficiency and prevent mechanical failures.