BCU 523834.04 – Depth Setting Potentiometer, Voltage Too Low. John Deere System Advisory.

BCU 523834.04 (BCU )

Code: 523834.04



Diagnostic trouble code BCU 523834.04 is generated when the Basic Control Unit (BCU) detects a voltage lower than 0.25 V at the signal input of the depth setting potentiometer. This unusually low voltage typically indicates a malfunction within the circuit of the depth setting potentiometer, possibly due to a break in the circuit, poor connections, or a faulty potentiometer.


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


  • Inspect Wiring and Connectors: Check the wiring and connectors linked to the depth setting potentiometer for any signs of damage, disconnection, or corrosion that could lead to a loss of voltage.
  • Test Potentiometer Output: Use a multimeter to measure the voltage output at the depth setting potentiometer. Ensure that the voltage levels meet the expected specifications under normal operating conditions.
  • Replace Faulty Potentiometer: If the potentiometer itself is found to be faulty and contributing to the low voltage reading, replace it to ensure proper functionality.
  • Examine Related Circuit Components: Investigate any other components in the circuit that might influence voltage levels, such as resistors or supply lines that might be damaged or incorrectly configured.
  • Reset and Recalibrate: After 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 crucial for the stable operation of machinery. Ensuring that all parts function 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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