BCU 303054.03 – B27/B98 Hitch Height Control Potentiometer, Signal Voltage Too High. John Deere System Advisory.

BCU 303054.03 (BCU )

Code: 303054.03



Error code BCU 303054.03 is generated when the Basic Control Unit (BCU) of a John Deere vehicle measures a voltage exceeding 4.75 V at the signal input of the B27/B98 hitch height control potentiometer during the calibration of the hitch control. This excessive voltage indicates a potential issue such as an internal fault in the potentiometer, incorrect wiring, or a problem in the electronic circuit that manages the potentiometer’s output, affecting the accurate calibration and operation of the hitch control system.


The system may halt the calibration process or display errors related to the hitch control operation, as the incorrect voltage could lead to improper settings or malfunction of the hitch, potentially impacting the vehicle’s operational efficiency and safety.


  • Inspect Hitch Height Control Potentiometer: Check the B27/B98 potentiometer for any signs of damage or wear. Ensure it is properly installed and connected.
  • Examine Wiring and Electrical Connections: Look for any issues in the wiring or connections that might cause high voltage readings, including shorts to power or damaged insulation that could expose the wiring.
  • Measure and Verify Voltage: Using a multimeter, measure the voltage at the signal input of the potentiometer to confirm that it exceeds the normal range. This will help in diagnosing the issue accurately.
  • Replace or Repair Faulty Potentiometer: If the potentiometer is found to be defective, replace it to ensure it provides the correct signal values for hitch height control.
  • Calibrate Hitch Control System: After replacing or repairing the potentiometer, recalibrate the hitch control system to ensure it functions accurately with the new or repaired potentiometer.
  • Reset the BCU and Clear Diagnostic Codes: Reset the BCU to clear any stored error codes and to acknowledge the repairs or changes made to the hitch control system. This ensures all systems are updated and functioning as expected.
  • Monitor System Post-Repair: Continuously monitor the hitch control system after the repair to ensure that the new potentiometer functions correctly and maintains the proper voltage range during operation.


Regular maintenance and prompt attention to diagnostic trouble codes are vital in preventing operational disruptions and ensuring the safety and efficiency of farming equipment. The hitch control system, particularly the hitch height potentiometer, plays a crucial role in precision farming operations, and its proper function is essential for optimal equipment performance.