BCU 523812.19 – Incorrect CAN BUS Message for Y74 Solenoid, PTO Speed 2. John Deere System Advisory.

BCU 523812.19 (BCU )

Code: 523812.19



Diagnostic trouble code BCU 523812.19 is triggered when there is a communication error involving the Y74 solenoid for PTO (Power Take-Off) Speed 2. This fault occurs because the output designated for switching the solenoid is erroneously energized by more than one control unit. This can lead to conflicting commands and improper operation of the PTO system, potentially causing erratic or unsafe machinery behavior.


In response to this fault, the system may temporarily disable the Y74 solenoid to prevent accidental activation or damage due to conflicting control inputs. Additionally, the system may issue alerts or warnings to notify the operator of the communication fault, requiring immediate attention to resolve the issue.


  • Diagnose CAN Bus Communication: Use diagnostic tools to analyze the communication paths within the CAN BUS system. Identify any misconfigurations or errors that are causing multiple control units to energize the same output.
  • Reconfigure System Settings: Adjust the settings in the control units to ensure that only the correct unit sends activation signals for the Y74 solenoid. Remove any duplicate configurations or correct misassigned controls.
  • Inspect and Secure Wiring Connections: Check all wiring connections to ensure they are correct and secure, as poor connections can sometimes mimic or cause communication errors.
  • Test System Operation: After making adjustments, thoroughly test the system to ensure that the Y74 solenoid operates correctly, with signals being correctly issued by the appropriate control unit without any overlaps.
  • Update Software/Firmware: If necessary, update the software or firmware of the involved control units to enhance their communication protocols and prevent future issues.


Maintaining clear and precise communication in vehicle control systems is crucial for operational reliability. Regular checks and updates of the system configurations and CAN BUS protocols are necessary to prevent communication errors and ensure that each component functions correctly as part of the overall system architecture. Addressing these issues promptly helps maintain the operational efficiency and safety of the equipment.

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