BCU 523813.01 – Power Supply Fault for Y73 Solenoid, PTO Speed 1. John Deere System Advisory.

BCU 523813.01 (BCU )

Code: 523813.01



Diagnostic trouble code BCU 523813.01 is activated when the power module PC5 measures a supply voltage of less than 3 volts at the output for the Y73 solenoid, which controls PTO (Power Take-Off) Speed 1, while the solenoid is switched on. This condition is detected at lead 0812 and associated with fuse F02 PLB/01, indicating a significant issue in the power supply possibly due to wiring problems, a faulty fuse, or issues within the power module itself.


The low voltage condition may cause the Y73 solenoid for PTO Speed 1 to fail to activate properly, potentially affecting the operational capabilities of the PTO system. The system may display error messages or warnings and disable the solenoid’s function to prevent damage from inadequate power supply.


  • Inspect Battery and Charging System: Ensure that the battery is fully charged and the charging system is functioning properly, as general low voltage issues may affect multiple systems.
  • Check Wiring and Connections: Examine the wiring and connections leading to lead 0812 for any signs of damage, corrosion, or loose connections that could contribute to voltage drops.
  • Test Fuse F02 PLB/01: Verify that fuse F02 PLB/01 is intact and functioning. Replace the fuse if it is found to be blown or damaged.
  • Measure Supply Voltage: Use a multimeter to measure the voltage at the output for the Y73 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 to ensure that the Y73 solenoid for PTO Speed 1 is operational and receives the correct voltage when activated.


Maintaining the electrical system, including routine checks of the power supply, wiring, and fuses, is crucial for the reliable operation of PTO systems and other critical machinery functions. 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.

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