BCU 523703.02 – B19 Right Draft Sensor, Distorted Signal During Calibration. John Deere System Advisory.

BCU 523703.02 (BCU )

Code: 523703.02



Error code BCU 523703.02 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects a distorted signal, characterized by a voltage variation of more than 0.5 volts, at the signal input of the right draft sensor during calibration. This diagnostic trouble code indicates a malfunction within the draft sensor circuit, which could be due to issues such as faulty wiring, a defective sensor, or interference affecting the sensor’s signal.


The distorted signal may lead to inaccurate readings from the right draft sensor, potentially causing improper adjustments or responses from the hitch system. This could affect the vehicle’s ability to perform tasks that rely on precise draft control.


  • Inspect the Right Draft Sensor and Wiring: Check the right draft sensor and its associated wiring for any signs of damage, wear, or loose connections that could be causing the voltage fluctuations.
  • Measure Sensor Output: Use a multimeter to measure the voltage output at the sensor during calibration to identify any abnormalities or fluctuations beyond the acceptable range.
  • Replace or Repair Faulty Components: If the sensor or wiring is found to be faulty, replace or repair these components to ensure reliable signal transmission.
  • Re-calibrate the Draft Sensor: After repairing or replacing the necessary parts, re-calibrate the right draft sensor to ensure it provides accurate readings to the BCU.
  • Reset the BCU: Clear any diagnostic trouble codes and reset the BCU to ensure it recognizes the repaired system and to reinitialize the system settings.
  • Test System Functionality: After resetting, thoroughly test the draft control system to confirm that the sensor now functions correctly and calibration is successful without any signal distortion.
  • Regular Monitoring and Preventive Maintenance: Continue to monitor the performance of the draft sensor and conduct regular preventive maintenance to avoid similar issues in the future. Regular checks can help detect potential problems early, reducing downtime and maintenance costs.


Maintaining the integrity and accuracy of sensor inputs is crucial for the proper function of agricultural machinery control systems. Sensors like the right draft sensor play a critical role in automating and optimizing machine performance. Ensuring that these components are in good working condition through regular maintenance and timely repairs is essential for maximizing the efficiency and reliability of the equipment.