BCU 523811.00 – Current Overload Protection Triggered for Y73 Solenoid, PTO Speed 1. John Deere System Advisory.

BCU 523811.00 (BCU )

Code: 523811.00



The diagnostic trouble code BCU 523811.00 is generated when the power module PC5 detects a total amperage exceeding 40 amps across the B3, C3, and D3 outputs. This code specifically relates to the Y73 solenoid for PTO (Power Take-Off) Speed 1, indicating a high current condition that typically suggests a short to ground or a defective component within the circuit. This issue may similarly affect the Y75 and Y74 solenoids for PTO Speeds 3 and 2, potentially triggering additional diagnostic codes such as BCU 523806.00 and BCU 523814.00 for those outputs.


To prevent electrical damage or hazards such as overheating and potential fire, the power module activates current overload protection. This safety feature likely results in the deactivation of the affected outputs, thus disabling the solenoids for PTO Speeds 1, 2, and 3 until the issue is resolved.


  • Inspect Wiring and Connectors: Check the wiring and connectors for outputs B3, C3, and D3. Look for any signs of damage, corrosion, or loose connections that could be causing the excessive current.
  • Test Electrical Components: Use electrical testing equipment to examine 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 identified as 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 no further overload conditions occur.
  • Review Additional Diagnostic Codes: Since this issue can trigger related diagnostic codes, review and address 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.