BCU 523806.05 – Y75 Solenoid for PTO Speed 3 On, No Current Present at Power Module PC5. John Deere System Advisory.

BCU 523806.05 (BCU )

Code: 523806.05



Error code BCU 523806.05 is activated when the Power Module PC5 in a John Deere vehicle detects a current of less than 500 mA at the output to the Y75 solenoid controlling PTO Speed 3 (lead 7115) while it is switched on. This diagnostic trouble code indicates an open circuit within the electrical system powering the solenoid, potentially caused by disconnected wires, broken connections, or a faulty solenoid itself.


This open circuit condition results in the failure of the Y75 solenoid to operate, leading to the non-functioning of PTO Speed 3. The lack of operational capability in this PTO setting can significantly affect the performance of any implements relying on this speed setting, potentially halting operations or leading to uneven performance.


  • Inspect Wiring and Connectors: Examine the wiring and connectors for lead 7115 for any signs of breakage, disconnection, or wear that could result in an open circuit.
  • Test Electrical Continuity: Use a multimeter to check for electrical continuity in the circuit associated with the Y75 solenoid. A lack of continuity will confirm the presence of an open circuit.
  • Replace or Repair Faulty Wiring: If any breaks or damage are found within the circuit, repair or replace the affected wiring to restore proper electrical connectivity.
  • Check the Y75 Solenoid: Inspect the Y75 solenoid itself for any malfunctions or damage that could prevent it from drawing the appropriate current. Replace the solenoid if it is found to be defective.
  • Reset the Power Module and BCU: After making the necessary repairs, reset the power module and the BCU to clear any stored fault codes and to reinitialize the system.
  • Test PTO System Functionality: Conduct tests to ensure that the Y75 solenoid for PTO Speed 3 is operating correctly and drawing adequate current to function as expected.
  • Routine Maintenance: Establish a regular maintenance schedule to inspect and test the PTO system and its electrical components. This will help in early detection of issues and prevent downtime.
  • Documentation of Repairs: Keep detailed records of the troubleshooting process, repairs made, and parts replaced. This documentation can be crucial for future maintenance and troubleshooting efforts.


Maintaining the electrical integrity of the PTO system and its components is critical for the reliable operation of agricultural machinery. Prompt identification and correction of issues such as open circuits ensure that the machinery continues to operate efficiently and effectively, minimizing disruptions to agricultural operations. Regular checks and maintenance are essential for sustaining the performance and extending the life of these systems.