BCU 523806.01 – Y75 Solenoid for PTO Speed 3, Power Supply Fault at Power Module PC5. John Deere System Advisory.

BCU 523806.01 (BCU )

Code: 523806.01



Error code BCU 523806.01 is triggered when the Power Module PC5 in a John Deere vehicle measures a supply voltage of less than 3 volts at the output designated for the Y75 solenoid controlling PTO Speed 3, specifically on lead 0232, protected by fuse F02 PLB/02. This diagnostic trouble code indicates a potential power supply issue, which could be due to a range of faults including a faulty power module, insufficient charging system output, poor wiring connections, or a blown fuse.


This low voltage condition can prevent the Y75 solenoid from operating correctly, impacting the functionality of the PTO Speed 3 setting. Such an issue can significantly reduce the effectiveness of PTO-driven implements, affecting operational efficiency and productivity.


  • Inspect Fuse and Power Connections: Check fuse F02 PLB/02 for continuity to ensure it has not blown. Inspect all wiring connections for tightness, corrosion, or damage that could impede power flow.
  • Measure Voltage Supply: Use a multimeter to measure the voltage at lead 0232 while the PTO Speed 3 solenoid is activated to confirm the low voltage reading.
  • Check Power Module PC5: Assess the condition and functionality of Power Module PC5. Look for signs of damage or malfunction that could contribute to inadequate voltage output.
  • Replace or Repair Faulty Components: Replace any blown fuses, repair or replace damaged wiring, and consider replacing the power module if it is found to be faulty.
  • Reset and Reinitialize the System: After making the necessary repairs or replacements, reset the power module and the BCU to clear the fault codes and reinitialize the system settings.
  • Test PTO System Operation: Conduct a comprehensive test of the PTO system to ensure that the Y75 solenoid for PTO Speed 3 now receives adequate power and operates as expected.
  • Ongoing Electrical System Maintenance: Integrate a regular maintenance schedule for the vehicle’s electrical systems, focusing on checking and maintaining crucial components like power modules, fuses, and solenoids.


Proper maintenance and timely resolution of power supply issues are crucial to ensure the reliability and functionality of PTO systems, which are essential for driving various agricultural implements. Regular checks can prevent minor issues from developing into major problems, thereby safeguarding equipment performance and longevity.