BCU 523834.03 – Depth Setting Potentiometer, Voltage Too High. John Deere System Advisory.

BCU 523834.03 (BCU )

Code: 523834.03



Diagnostic trouble code BCU 523834.03 is triggered when the Basic Control Unit (BCU) detects a voltage higher than 4.75 V at the signal input of the depth setting potentiometer. This abnormal voltage typically indicates a malfunction within the circuit of the depth setting potentiometer, which could be due to issues such as a short to power, a faulty potentiometer, or incorrect wiring.


The control system may respond to this error by limiting or modifying the functionality associated with the depth setting potentiometer to prevent incorrect operation or further damage. An alert may also be displayed on the operator’s panel to inform of the high voltage condition.


  • Inspect Wiring and Connectors: Check the wiring and connectors linked to the depth setting potentiometer for any signs of damage, wear, or improper connections that could lead to a voltage spike.
  • Test Potentiometer Output: Use a multimeter to measure the voltage output at the depth setting potentiometer. Verify that the voltage levels align with the expected specifications under normal operating conditions.
  • Replace Faulty Potentiometer: If the potentiometer itself is faulty and contributing to the high voltage reading, consider replacing it to ensure proper functionality.
  • Examine Related Circuit Components: Look for any other components in the circuit that could influence voltage levels, such as resistors or supply lines that might be faulty or incorrectly configured.
  • Reset and Recalibrate: After making any necessary repairs or replacements, reset the system and recalibrate the depth setting potentiometer to ensure accurate readings and functionality.


Regular maintenance and routine checks of electrical components and their connections are vital for the stable operation of machinery. Ensuring that all parts are functioning correctly and within their specified voltage ranges helps prevent operational issues and maintains the efficiency and reliability of the equipment. Addressing voltage issues promptly is essential to avoid further complications and ensure precise control over machinery settings.

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