SCO 003509.04 – 5-Volt Supply Voltage, Voltage Too Low

SCO 003509.04 (SCO 3509.04)

Code: 003509.04

Shortcode: 3509.04


This error code, SCO 003509.04, indicates that the supply voltage for 5-volt components has fallen below 4.55 volts, suggesting a short to ground or an internal fault of the control unit. This low voltage can prevent the control software from operating correctly.


When this fault is detected, the control software may have limited functionality or may cease to function altogether.


  • Inspect Wiring for Shorts:
    • Check the wiring and connections to the 5-volt components for signs of shorts to ground. Repair or replace any damaged wires.
  • Verify Power Supply:
    • Ensure that the power supply to the 5-volt components is stable and within the required voltage range. Replace the power supply components if necessary.
  • Check Electrical Connections:
    • Inspect all electrical connections for corrosion, looseness, or damage. Clean and secure connections as needed.
  • Test Control Unit:
    • Test the control unit for internal faults. Recalibrate or replace the control unit if necessary.
  • Monitor Voltage:
    • Continuously monitor the voltage at the 5-volt component inputs to ensure it stays within the recommended range.


Preventive Maintenance:

  • Regular inspections of the electrical system can help identify and address potential voltage issues before they cause operational problems.

Control Units: John Deere

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