BCU 001079.03 – Draft Sensor High Voltage Error. John Deere System Advisory.

BCU 001079.03 (BCU 1079.03)

Code: 001079.03

Shortcode: 1079.03


Error code BCU 001079.03 is recorded when the Basic Control Unit (BCU) of a John Deere vehicle detects an abnormally high voltage (above 4.75 V) at the signal input of the draft sensor. This condition suggests a malfunction within the draft sensor circuit, potentially due to issues such as an electrical short, incorrect wiring, or a fault within the sensor itself.


The BCU may respond to this high voltage by triggering warning signals on the dashboard and potentially altering the operation of systems reliant on accurate draft sensor readings. This precaution helps prevent incorrect machine operation based on faulty sensor data.


  • Inspect Draft Sensor and Wiring: Carefully check the draft sensor for any signs of damage or corrosion. Examine the wiring connected to the sensor for shorts, frays, or disconnections that could lead to high voltage readings.
  • Measure Voltage Levels: Use a multimeter to measure the voltage at the draft sensor’s signal input. Compare these readings with the normal operating specifications to confirm the fault.
  • Replace or Repair Faulty Components: If the draft sensor or any associated wiring is found to be defective, replace or repair these components to ensure correct functionality.
  • Re-test the Sensor System: After repairs or replacements are made, re-test the sensor system to ensure that the voltage readings have normalized and are within the specified limits.
  • Reset the BCU and Clear Diagnostic Codes: Clear any stored fault codes from the BCU and reset the system to ensure that all changes take effect and the system operates without errors.


The draft sensor plays a crucial role in monitoring and adjusting the position of implements attached to the tractor, ensuring optimal performance and efficient operation. Maintaining the integrity of this sensor and its connections is essential for precise agricultural operations. Regular checks and timely maintenance can help avoid disruptions and ensure that your John Deere equipment functions effectively in all working conditions.