BCU 523806.19 – Y75 Solenoid for PTO Speed 3, Incorrect CAN BUS Message (Power Module PC5). John Deere System Advisory.

BCU 523806.19 (BCU )

Code: 523806.19



Error code BCU 523806.19 is triggered when the Power Module PC5 in a John Deere vehicle reports that the output for the Y75 solenoid controlling PTO Speed 3 is being energized by signals from more than one control unit. This diagnostic trouble code suggests a conflict or error in the CAN (Controller Area Network) bus messages, which may be due to overlapping commands, misconfigured software, or faulty communication within the vehicle’s networked systems.


This conflicting control can lead to unpredictable operation of the PTO Speed 3 solenoid, potentially causing erratic behavior of the PTO system. Such issues can undermine the efficiency of operations and safety of PTO-driven implements.


  • Inspect CAN Bus Network: Check the CAN bus network for configuration errors or malfunctioning units that might be sending overlapping or duplicate signals.
  • Diagnose Communication Issues: Use specialized diagnostic tools to monitor the CAN messages being sent to the Power Module PC5. Look for sources of conflicting signals and correct the programming or setup as necessary.
  • Update System Software: Ensure that all control units involved in PTO control are updated with the latest software to prevent communication errors. Updates may resolve misconfiguration issues or software bugs causing the conflict.
  • Replace or Repair Faulty Control Units: If any control units are found to be malfunctioning and contributing to the issue, repair or replace them to ensure correct operation.
  • Reset and Reconfigure the Power Module and BCU: After addressing any communication issues, reset the power module and the BCU to clear any fault codes and reinitialize the system with the corrected settings.
  • Test PTO System Operation: Conduct thorough testing to ensure that the Y75 solenoid for PTO Speed 3 operates correctly and only responds to appropriate control signals.
  • Ongoing Monitoring and Maintenance: Regularly monitor the CAN bus system and perform maintenance checks to prevent future communication issues. Keeping the system well-maintained and promptly addressing any signs of trouble can help avoid operational disruptions.


Effective management of communication networks in agricultural machinery is crucial for ensuring that all components operate harmoniously. Ensuring that the CAN bus system is correctly configured and free of conflicts is vital for the reliable operation of complex machinery. Regular updates, monitoring, and maintenance are key strategies to maintain system integrity and operational efficiency.