BCU 523905.31 – Front PTO Solenoid Valve, Fault. John Deere System Advisory.





Diagnostic trouble code BCU 523905.31 is generated when the Basic Control Unit (BCU) detects an open circuit to the front PTO (Power Take-Off) solenoid valve. This issue indicates that there is a discontinuity or a break in the electrical path that should be delivering current to the solenoid valve, which controls the operation of the front PTO. An open circuit can prevent the front PTO from engaging or operating correctly, potentially halting any operations that depend on the PTO.


The system may disable the front PTO function to prevent damage to the equipment or unsafe operating conditions. An alert or warning will likely be displayed on the operator’s control panel to notify them of the issue.


  • Inspect Wiring and Connectors: Check the wiring and connectors leading to the front PTO solenoid valve. Look for signs of damage, wear, or disconnections that could be causing the open circuit.
  • Test Solenoid Valve and Circuit: Use a multimeter to test the solenoid valve and its circuit for continuity. This can help confirm the presence of an open circuit and identify the specific location of the fault.
  • Repair or Replace Faulty Components: If a specific section of wiring or a component is identified as faulty, repair or replace it to restore the continuity of the circuit.
  • Ensure Proper Connections: Make sure that all electrical connections are secure and properly insulated to prevent future occurrences of similar issues.
  • Test System Functionality: After repairs, test the front PTO system to ensure it is operating correctly. Verify that the solenoid valve engages and functions as expected without any abnormalities.
  • Regular Maintenance: Incorporate regular checks of the PTO system and its components into the equipment’s routine maintenance schedule to help identify and rectify potential issues before they result in system failure.


Proper maintenance and timely resolution of issues like an open circuit in the PTO system are crucial for maintaining the operational efficiency and safety of agricultural machinery. Keeping electrical components and wiring in good condition ensures reliable performance and extends the life of the equipment.

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