BCU 523756.16 – M08 Stepper Motor for Hitch, Lowering Deadband Too High During Calibration. John Deere System Advisory.

BCU 523756.16 (BCU )

Code: 523756.16



Error code BCU 523756.16 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects that the lowering deadband—the gap between the adjustment cam of the stepper motor and the lower valve of the hitch valve—is too high during the calibration process. This excessive play can result in a delayed or sluggish response when lowering the hitch, potentially affecting precision and control during operations that require accurate hitch positioning.


The excessive deadband can lead to inefficient operation of the hitch, causing delays and lack of precision in hitch movements. This can impair the tractor’s ability to perform tasks efficiently, especially those that depend on precise positioning of implements.


  • Inspect Mechanical Linkage: Check the mechanical linkage between the stepper motor and the lower valve of the hitch. Look for any signs of excessive wear or incorrect adjustments that might have led to the high deadband.
  • Adjust the Deadband: Make the necessary adjustments to the linkage to reduce the deadband to within the manufacturer’s specified tolerances.
  • Re-calibrate the Hitch System: Following the adjustment, recalibrate the hitch system to ensure that the new settings are correctly implemented, allowing for proper operation.
  • Reset the BCU: Clear any stored fault codes and reset the BCU to ensure it recognizes the corrected settings and functions accordingly.
  • Test Hitch Operation: Perform tests to ensure that the hitch responds accurately and promptly to commands for lowering. Verify that the adjustments have effectively corrected the issue and that the system operates smoothly.
  • Routine Maintenance and Inspections: Incorporate regular checks of the hitch system and its components into the maintenance schedule to prevent similar issues. Pay particular attention to mechanical linkages and adjustment settings.
  • Document the Procedure: Keep a record of the adjustments made and the results of the recalibration for future reference. This documentation can be useful for troubleshooting future issues or during routine maintenance checks.


Proper calibration and maintenance of the hitch system are crucial for the performance and efficiency of agricultural machinery. Regularly assessing and adjusting the deadband settings ensures that the hitch operates reliably and effectively, optimizing the functionality of the tractor and attached implements. Keeping these components well-maintained not only enhances operational precision but also extends the life of the machinery.