BCU 303054.04 – B27/B98 Hitch Height Control Potentiometer, Signal Voltage Too Low. John Deere System Advisory.

BCU 303054.04 (BCU )

Code: 303054.04



Error code BCU 303054.04 occurs when the Basic Control Unit (BCU) of a John Deere vehicle measures a voltage below 0.25 V at the signal input of the B27/B98 hitch height control potentiometer during hitch control calibration. This low voltage reading can indicate issues such as a poor connection, a broken wire, or a fault within the potentiometer itself, potentially affecting the accurate control and calibration of the hitch system.


The calibration process for the hitch system may be interrupted due to the inadequate voltage signal, leading to incorrect hitch positioning or failure to operate correctly. This can significantly impact the tractor’s functionality and operational safety.


  • Inspect the Hitch Height Control Potentiometer: Examine the potentiometer and its installation for any signs of physical damage or wear. Check if it is correctly installed and securely mounted.
  • Check Wiring and Electrical Connections: Assess the wiring leading to and from the potentiometer. Look for signs of damage, corrosion, or loose connections that might be causing the low voltage readings.
  • Measure Voltage at Signal Input: Using a multimeter, confirm the low voltage at the potentiometer’s signal input to diagnose the issue accurately.
  • Repair or Replace Faulty Components: If a fault in the potentiometer or its wiring is identified, repair or replace the necessary parts to ensure the potentiometer can correctly measure and transmit voltage.
  • Recalibrate the Hitch Control System: After any repairs or component replacements, recalibrate the hitch control system to ensure it functions accurately with the corrected potentiometer settings.
  • Reset the BCU and Clear Diagnostic Codes: Resetting the BCU will clear any stored error codes and help reinitialize the system settings after the repairs, ensuring that the system recognizes the changes.
  • Monitor System Operation Post-Repair: Continuously monitor the hitch system after the repairs to ensure that the potentiometer functions correctly and maintains the proper voltage range during operation, verifying that the issue has been resolved.


Regular maintenance and careful monitoring of key components such as the hitch height control potentiometer are crucial for the proper operation of agricultural machinery. Ensuring that these components function correctly is vital for precision in operations, particularly in tasks requiring accurate hitch positioning. Prompt attention to resolving any issues helps maintain operational efficiency and prevents potential safety hazards in the field.