BCU 523759.11 – S44 Remote Control Switch for Rear PTO (Left), Fault. John Deere System Advisory.

BCU 523759.11 (BCU )

Code: 523759.11



Error code BCU 523759.11 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects an unrealistic value from the switch used for remote control of the rear Power Take-Off (PTO) on the left side. This diagnostic trouble code suggests a potential malfunction of the switch, possibly due to internal defects, wiring issues, or external interference affecting the switch’s functionality.


A fault in the remote control switch could compromise the operation of the rear PTO, affecting its ability to engage or disengage correctly. This malfunction can impact the effectiveness of PTO-driven implements and potentially disrupt farming operations, leading to decreased efficiency and productivity.


  • Inspect the Remote Control Switch: Examine the left remote control switch for physical damage, signs of wear, or corrosion that might impact its performance.
  • Test Switch Operation: Use electrical testing tools, such as a multimeter, to check the functionality of the switch. Measure continuity and resistance to ensure it is functioning within specified parameters.
  • Replace or Repair the Faulty Switch: If the switch is found to be faulty, replace it or repair it to restore proper operation. Make sure all connections are securely reattached and correctly insulated to prevent future issues.
  • Check and Secure Wiring Connections: Ensure that all wiring related to the switch is intact and securely connected. Repair any damaged or loose wiring that could be causing signal disruptions.
  • Reset the BCU: After repairs or replacement of the switch, reset the BCU to clear the fault code and ensure the system recognizes the updated component.
  • Functional Testing of the PTO System: Conduct tests to verify that the rear PTO responds accurately to commands from the newly repaired or replaced switch. Ensure that the PTO system operates smoothly and engages and disengages without error.
  • Ongoing Maintenance and Monitoring: Regularly check the PTO system and its control switches as part of routine maintenance. Keeping electronic controls in good working order is crucial for reliable machine operation.
  • Documentation and Operator Training: Document all repairs and adjustments made, and provide training or reminders to operators about the importance of reporting any unusual behavior in machine controls promptly.


Effective and timely maintenance of control switches for critical operational systems like the PTO ensures continued functionality and prevents unexpected downtime. Regular checks help identify issues early, allowing for corrections before they impact the broader system, ensuring operational efficiency and safety.