BCU 523806.12 – Current Detected When Y75 Solenoid for PTO Speed 3 is Off. John Deere System Advisory.

BCU 523806.12 (BCU )

Code: 523806.12



Diagnostic trouble code BCU 523806.12 is triggered when the power module PC5 detects a current of more than 1 amp at the output of the Y75 solenoid for PTO (Power Take-Off) Speed 3, even though the solenoid is switched off. This condition often indicates a short in the circuit or an internal fault within the power module itself, potentially leading to unwanted power consumption and risk of damage or overheating.


The system may automatically disable the Y75 solenoid or initiate protective measures to prevent damage and alert the operator to the fault through system warnings or error messages.


  • Inspect Wiring and Connectors: Examine the wiring and connectors related to lead 7115 for any signs of damage, wear, or loose connections that might be causing the short.
  • Test for Short Circuits: Use a multimeter to check for continuity and to locate any shorts in the circuit. Focus particularly on areas where wires may be pinched or insulation may be damaged.
  • Replace or Repair Faulty Wiring: If specific areas of damage or malfunction are identified, replace or repair the faulty wiring to resolve the short circuit issue.
  • Check Power Module Functionality: Ensure that the power module PC5 is functioning correctly. If an internal fault is suspected, further testing or replacement of the module may be necessary.
  • Reset and Test the System: After making the necessary repairs, reset any associated fault codes and test the system to ensure that the issue has been resolved and that the Y75 solenoid operates correctly without any unexpected current flow when off.


Regular maintenance and proactive checks of electrical systems are crucial for identifying and rectifying issues such as shorts and unexpected current conditions. Early detection and correction of electrical faults help maintain the safety and efficiency of operations, thereby extending the life of the equipment. Addressing such issues promptly is key to minimizing downtime and ensuring that the PTO system remains operational and effective.