BCU 523806.00 – Current Overload Protection Triggered for Y75 Solenoid, PTO Speed 3. John Deere System Advisory.

BCU 523806.00 (BCU )

Code: 523806.00



The diagnostic trouble code BCU 523806.00 is activated when the power module PC5 measures a total amperage in excess of 40 amps at the B3, C3, and D3 outputs. This code is specifically associated with the Y75 solenoid for Power Take-Off (PTO) Speed 3. Such high current measurements typically indicate a short to ground or a defective component within the circuits connected to these outputs, which also include:

  • Output C3: Y73 Solenoid for PTO Speed 1, potentially triggering diagnostic trouble code BCU 523811.00.
  • Output D3: Y74 Solenoid for PTO Speed 2, potentially triggering diagnostic trouble code BCU 523814.00.


In response to this high current condition, the power module automatically activates current overload protection, which likely results in the deactivation of the outputs to prevent further electrical damage or potential fire hazards.


  • Inspect Wiring and Connectors: Thoroughly examine the wiring and connectors for outputs B3, C3, and D3. Look for signs of damage, wear, or improper connections that might be causing the excessive current.
  • Test Electrical Components: Use electrical testing tools to check the solenoids and other components connected to these outputs for shorts or other faults.
  • Replace or Repair Faulty Components: If specific components or sections of wiring are found to be faulty, replace or repair them to resolve the issue and restore proper functionality.
  • Reset and Monitor the System: After repairs, reset the power module and monitor the system to ensure that the current levels have returned to normal and that no further overload conditions occur.
  • Review Additional Diagnostic Codes: Since this issue may trigger other related diagnostic codes, review and resolve any additional codes that have appeared as a result of this overload condition.


Monitoring and maintaining the electrical components of PTO systems are crucial for ensuring the safe and efficient operation of agricultural machinery. Regular checks and maintenance can help identify potential issues before they lead to more serious problems, thereby minimizing downtime and enhancing equipment longevity. Addressing current overload issues promptly is key to maintaining operational efficiency and preventing damage.