BCU 523806.01 – Power Supply Fault for Y75 Solenoid, PTO Speed 3. John Deere System Advisory.

BCU 523806.01 (BCU )

Code: 523806.01



Diagnostic trouble code BCU 523806.01 is issued when the power module PC5 measures a supply voltage of less than 3 volts at the output for the Y75 solenoid, which controls PTO (Power Take-Off) Speed 3. This condition is detected while the solenoid is activated, indicating a significant power supply issue that could stem from wiring problems, a faulty fuse, or issues within the power module itself.


The low voltage condition may cause the solenoid to fail to activate, preventing the PTO Speed 3 from engaging. This fault may trigger the system to display error messages or warnings and may disable the solenoid’s operation to prevent damage from inadequate power supply.


  • Inspect Wiring and Connections: Examine the wiring and connections leading to lead 0232, particularly focusing on potential breaks or loose connections that could result in voltage drops.
  • Check Fuse F02 PLB/02: Verify that the fuse associated with this circuit is intact and functioning correctly. Replace the fuse if it is found to be blown or showing signs of damage.
  • Measure Supply Voltage: Use a multimeter to measure the voltage at the output for the Y75 solenoid when it is activated to confirm the low voltage condition.
  • Replace or Repair Faulty Components: If any faulty wiring, connections, or components in the power module are identified, repair or replace them to ensure a stable and adequate power supply.
  • Reset and Test the System: After addressing the identified issues, reset any fault indicators and test the system thoroughly to ensure that the Y75 solenoid for PTO Speed 3 is receiving sufficient voltage and is operating correctly.


Regular maintenance and routine checks of the electrical systems are crucial for the reliable operation of PTO systems. Addressing power supply faults promptly helps ensure that the PTO system operates efficiently and effectively, reducing the risk of operational downtime and maintaining productivity in agricultural settings.