BCU 523812.00 – Current Overload Protection Triggered for Y74 Solenoid, PTO Speed 2. John Deere System Advisory.

BCU 523812.00 (BCU )

Code: 523812.00



Diagnostic trouble code BCU 523812.00 is activated when the power module PC5 detects a total amperage exceeding 40 amps across the A1, B1, and C1 outputs. This specific code relates to the Y74 solenoid for PTO (Power Take-Off) Speed 2. High current measurements like this typically suggest a short to ground or a defective component within the circuits, potentially involving:

  • Output A1: Y75 Solenoid for PTO Speed 3, possibly triggering diagnostic trouble code BCU 523815.00.
  • Output B1: Y73 Solenoid for PTO Speed 1, possibly triggering diagnostic trouble code BCU 523813.00.
  • Output C1: Y74 Solenoid itself.


To prevent electrical damage or hazards, such as overheating or fire, the power module activates current overload protection, which likely results in the deactivation of the outputs to stop further electrical damage. Alerts or warnings may be issued to inform the operator of the fault and necessary corrective actions.


  • Inspect Wiring and Connectors: Check the wiring and connectors for outputs A1, B1, and C1. Look for any signs of damage, corrosion, or loose connections that could 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 restore proper functionality and prevent further issues.
  • Reset and Monitor the System: After making 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 related diagnostic codes, review and resolve any additional codes that appear as a result of this overload condition to ensure comprehensive resolution.


Regular monitoring and maintenance of the electrical components involved in the PTO system are crucial for ensuring the safe and efficient operation of agricultural machinery. Addressing current overload issues promptly helps maintain operational efficiency and prevent damage to the machinery, thereby minimizing downtime and enhancing equipment longevity.