BCU 523806.05 – No Current Detected for Y75 Solenoid, PTO Speed 3. John Deere System Advisory.

BCU 523806.05 (BCU )

Code: 523806.05



The diagnostic trouble code BCU 523806.05 is activated when the power module PC5 detects a current of less than 500 mA in lead 7115, while the Y75 solenoid for PTO (Power Take-Off) Speed 3 is switched on. This low current measurement typically indicates an open circuit, suggesting a disconnection or break in the electrical pathway that should be powering the solenoid.


Upon detecting this fault, the power module may disable the Y75 solenoid to prevent any potential damage from attempted operation without adequate current. An alert or diagnostic indicator is likely to notify the operator of the malfunction, indicating the need for electrical troubleshooting.


  • Inspect Wiring and Connections: Examine all wiring and connections related to lead 7115 for any signs of breaks, disconnections, or wear that could result in an open circuit.
  • Test for Continuity: Use a multimeter to check for continuity in the circuit. This will help identify the location and nature of the open circuit.
  • Repair or Replace Faulty Wiring: If a break or disconnection is found, repair or replace the affected wiring to restore proper electrical flow.
  • Check Solenoid Functionality: Ensure that the Y75 solenoid itself is not faulty. Test the solenoid for operational integrity and replace it if necessary.
  • Reset the System and Test: After addressing the electrical issues, reset any fault codes and test the system to ensure the Y75 solenoid is operational and receives the correct current when activated.


Regular and thorough maintenance of the electrical systems, particularly for critical components like solenoids controlling PTO functions, is crucial for ensuring reliable machinery operation. Proactive management of these systems helps avoid operational downtime and ensures the equipment functions safely and efficiently. Addressing open circuit issues promptly is essential to maintaining the operational readiness and effectiveness of the PTO system.