BCU 523703.15 – B19 Right Draft Sensor, Voltage Too High. John Deere System Advisory.

BCU 523703.15 (BCU )

Code: 523703.15



Error code BCU 523703.15 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects an abnormally high voltage, exceeding 4.75 volts, at the signal input of the right-hand (r.h.) draft sensor. This diagnostic trouble code suggests a malfunction within the draft sensor circuit, which may include issues such as electrical interference, a faulty sensor, or improper wiring that is causing elevated voltage levels.


The high voltage detection can lead to inaccurate readings from the right draft sensor, potentially affecting the tractor’s hitch control system. This could impair the tractor’s ability to effectively manage implements attached to the hitch, impacting performance and operational efficiency.


  • Inspect the Right Draft Sensor and Wiring: Check the right draft sensor and its wiring for any signs of damage, wear, or loose connections that could be causing the high voltage readings.
  • Test Sensor Voltage: Utilize a multimeter to measure the voltage at the draft sensor’s input during operation to confirm the high voltage condition.
  • Replace or Repair Faulty Components: If the sensor or wiring is damaged or faulty, replace or repair these parts to ensure the correct functioning of the draft sensor.
  • Re-calibrate the Draft Sensor: Following any component replacement or repair, recalibrate the right draft sensor to ensure it delivers accurate data to the BCU.
  • Reset the BCU: Clear any diagnostic trouble codes and reset the BCU to ensure it properly recognizes the repaired system and reinitializes its settings.
  • Test the System Functionality: Conduct tests to verify that the draft sensor operates correctly post-repair, ensuring that it no longer exhibits high voltage readings during operation.
  • Regular System Checks and Preventive Maintenance: Implement a routine inspection schedule for the electrical system, focusing on areas prone to wear and damage. Regular maintenance can prevent future issues and ensure the reliability of critical operational components like the draft sensor.


Proper sensor function is critical for precision agricultural operations that rely on accurate data inputs for effective machinery control. Regular maintenance and timely intervention when issues are detected are essential to prevent disruptions and ensure continued efficient operation of equipment.