BCU 523813.09 – Incorrect CAN BUS Message for Y73 Solenoid, PTO Speed 1. John Deere System Advisory.

BCU 523813.09 (BCU )

Code: 523813.09



Diagnostic trouble code BCU 523813.09 is issued when there is a communication problem between the power module PC5 and the Body Control Unit (BCU). This issue involves intermittent or non-existent reception of one or several CAN messages that are critical for the operation of the Y73 solenoid for PTO (Power Take-Off) Speed 1. Such interruptions in communication can be due to loose wiring or other connectivity issues, which may hinder the reliable operation of the PTO system.


The system may temporarily disable the Y73 solenoid to prevent incorrect operation based on the flawed data transmission. Additionally, the system may issue alerts or warnings to notify the operator of the communication fault, requiring immediate attention to resolve the issue.


  • 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 Wire Continuity and Security: Use diagnostic tools to test the continuity of the wires involved in the CAN bus system. 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 that 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 clear and correct 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. Ensuring clear and correct communication pathways within vehicle control systems is essential for operational reliability and accuracy.

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