BCU 001079.04 – Draft Sensor Low Voltage Error. John Deere System Advisory.

BCU 001079.04 (BCU 1079.04)

Code: 001079.04

Shortcode: 1079.04


Error code BCU 001079.04 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects abnormally low voltage (below 0.25 V) at the signal input of the draft sensor. This low voltage condition indicates a potential malfunction in the draft sensor circuit, possibly due to issues such as a broken wire, poor connections, or a fault within the sensor itself.


The BCU may activate warning indicators and potentially limit the functionality of systems dependent on the draft sensor readings to prevent operations based on inaccurate data, thus safeguarding against ineffective or damaging tractor operations.


  • Inspect Draft Sensor and Wiring: Thoroughly examine the draft sensor and its wiring. Look for signs of wear, damage, or corrosion, particularly at connection points and along the wire lengths that could lead to voltage drops.
  • Measure Voltage Output: Utilize a multimeter to verify the voltage at the sensor’s signal input. Ensure the readings are consistent and diagnose the point of voltage drop if present.
  • Repair or Replace Faulty Wiring: If any broken wires or poor connections are discovered, make necessary repairs or replace the wiring to restore proper voltage levels.
  • Replace Faulty Draft Sensor: Should the sensor itself prove defective after testing, replace it to ensure accurate performance and functionality.
  • Re-test the Sensor System: After addressing the identified issues, test the sensor system again to confirm that voltage readings are now within the normal range.
  • Reset the BCU and Clear Diagnostic Codes: Reset the BCU to clear any diagnostic codes related to the draft sensor, ensuring the system is fully operational without residual errors.


Regular monitoring and maintenance of the draft sensor and its circuitry are crucial for maintaining the optimal functionality of John Deere’s precision farming tools. Ensuring that electrical components are in good working condition supports the accurate operation of attachments and implements, critical for achieving efficient agricultural output. Keep up with routine inspections and address any electrical issues promptly to avoid operational interruptions and maintain productivity.