BCU 001873.17 – Hitch Position Sensor Low Voltage During Calibration. John Deere System Advisory.

BCU 001873.17 (BCU 1873.17)

Code: 001873.17

Shortcode: 1873.17


Error code BCU 001873.17 is initiated when the Basic Control Unit (BCU) of a John Deere vehicle detects a voltage at the hitch position sensor that is too low during the calibration process. This low voltage could signify issues such as poor electrical connections, degraded wiring, or a failing sensor, potentially leading to inaccurate calibration of the hitch position, which is essential for precise implement control.


In response to this error, the BCU may pause or stop the calibration process to prevent the establishment of incorrect hitch positions that could adversely affect the vehicle’s operation and implement performance.


  • Inspect Hitch Position Sensor and Wiring: Examine the hitch position sensor and its associated wiring for any signs of damage, wear, or corrosion. Check for loose or corroded connectors that might be contributing to the low voltage.
  • Test Voltage Output: Use a multimeter to verify the voltage output at the sensor during calibration. Confirm that the readings are below the required thresholds and identify potential points of failure in the circuit.
  • Repair or Replace Damaged Components: Repair any damaged wires or replace corroded connectors to restore proper electrical continuity. If the hitch position sensor is found to be defective, replace it to ensure accurate function.
  • Re-Calibrate the Hitch System: Once repairs are completed, recalibrate the hitch system to ensure the hitch position sensor accurately measures and reports the position. Ensure all system settings are adjusted to reflect any new components.
  • Reset the BCU and Clear Diagnostic Codes: After recalibration, reset the BCU to clear any fault codes and ensure that the system recognizes the newly calibrated settings without any voltage issues.


Accurate hitch position calibration is vital for efficient tractor operation and precise control over attached implements. Regular checks and maintenance of the hitch position sensor and its electrical components can prevent issues that lead to poor calibration and potential operational inefficiencies. Ensuring that all parts are in good working condition helps maintain the overall productivity and effectiveness of your John Deere equipment.