BCU 523806.09 – Incorrect CAN BUS Message for Y75 Solenoid, PTO Speed 3. John Deere System Advisory.

BCU 523806.09 (BCU )

Code: 523806.09



Diagnostic trouble code BCU 523806.09 is issued when there is a communication issue between the power module PC5 and the Body Control Unit (BCU). This fault arises due to problems in the transfer of CAN BUS messages that control the operation of the Y75 solenoid for PTO (Power Take-Off) Speed 3. Issues such as intermittent or nonexistent reception of these messages could be indicative of loose wiring or other connectivity problems within the CAN BUS network.


The system may temporarily disable the function of the Y75 solenoid to prevent improper operation based on incorrect or missing data. Additionally, warning indicators may be activated to alert the operator to the communication fault.


  • Inspect CAN Bus Connections: Thoroughly check all related CAN bus connections between the BCU and power module PC5, ensuring they are secure and free from corrosion or damage.
  • Test Wiring Continuity: Use diagnostic tools to check for continuity in the wiring. Focus on identifying any loose or intermittent connections that could be disrupting communication.
  • Resolve Connectivity Issues: Tighten or replace any loose or damaged connectors or wiring found during the inspection.
  • Check for CAN Bus Interference: Ensure there is no electromagnetic interference affecting CAN bus communication. Keep wiring away from high voltage lines or equipment that may emit strong electromagnetic fields.
  • Reset and Reconfigure Systems: After ensuring all physical connections are intact and secure, reset the CAN bus system and reconfigure settings if necessary to ensure proper communication protocols are followed.
  • Monitor System Performance: Continuously monitor the system to ensure that communication has been fully restored and that no further message errors are occurring.


Maintaining reliable communication across the CAN bus is crucial for the efficient operation of all interconnected vehicle systems. Regular diagnostics and proactive maintenance can help avoid communication failures and ensure that the equipment operates smoothly and effectively.