CCU 003509.04 – Sensor Supply Voltage Out of Range Low

CCU 003509.04 (CCU 3509.04)

Code: 003509.04

Shortcode: 3509.04


This fault code indicates that the voltage supplied to sensors is below the normal operational range, specifically dropping below 4.8 volts. This could be due to a failing battery, poor wiring, or issues within the vehicle’s charging system, leading to inadequate sensor performance and potential system malfunctions.


The control unit degrades certain functionalities to prevent incorrect sensor operations and potential system errors due to low voltage.


  • Check Battery and Charging System: Evaluate the condition of the battery and the effectiveness of the charging system to ensure they are providing adequate power.
  • Inspect Wiring and Connections: Ensure that all electrical connections are secure and that wires are not damaged or corroded, which could contribute to voltage drops.
  • Verify Voltage Levels: Use diagnostic tools to check the actual voltage being supplied to the sensors and address any discrepancies.
  • Replace Faulty Components: If any components of the electrical system are found to be faulty, replace them to restore proper voltage levels.
  • Calibration and System Testing: Once repairs are made, recalibrate any affected sensors and perform comprehensive system tests to ensure all operations are back to normal.


Maintaining stable and adequate voltage levels is essential for sensor accuracy and overall system reliability. Regular checks can help identify and rectify voltage issues promptly.

Control Units: John Deere

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