BCU 523811.04 – High Current Detected for Y73 Solenoid, PTO Speed 1. John Deere System Advisory.

BCU 523811.04 (BCU )

Code: 523811.04



Diagnostic trouble code BCU 523811.04 is activated when the power module PC5 records a current exceeding 30 amps in lead 7063 while the Y73 solenoid for PTO (Power Take-Off) Speed 1 is switched on. This unusually high current typically indicates a short to ground within the circuit, which can lead to overheating, potential damage to electrical components, and an increased risk of electrical fires.


The power module likely initiates its overload protection feature in response to this condition, which includes shutting down the affected circuit to prevent further damage. The system may also alert the operator to the fault through diagnostic indicators or warning messages.


  • Inspect Wiring and Connectors: Thoroughly examine the wiring and connectors associated with lead 7063. Look for signs of damage such as worn insulation, exposed wires, or any abnormalities that might cause a short circuit.
  • Test for Short to Ground: Use a multimeter to test the circuit for continuity and to locate any potential short to ground. Focus on identifying the specific locations where shorting may occur.
  • Replace or Repair Damaged Components: If specific areas of damage or malfunction are identified, replace or repair the faulty wiring or components to resolve the short circuit issue.
  • Check Solenoid Integrity: Ensure that the Y73 solenoid itself is not the source of the short. If the solenoid is damaged, it should be replaced.
  • Reset and Test the System: After repairs are made, reset any associated fault codes and test the system to ensure that the issue has been resolved and that the current remains within safe operational limits.


Regular maintenance and proactive checks of the vehicle’s electrical systems are crucial for identifying and rectifying issues such as shorts and high 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.

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