SCO 002646.03 – Stepper Motors for E-SCV XI and E-SCV XIV, Voltage Too High

SCO 002646.03 (SCO 2646.03)

Code: 002646.03

Shortcode: 2646.03


This error code, SCO 002646.03, indicates that the voltage for the stepper motors of E-SCV XI and E-SCV XIV is too high, potentially due to an open circuit or a short to 12 volts. This can prevent the stepper motors from operating correctly.


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


  • Inspect Wiring for Shorts:
    • Check the wiring and connections to the stepper motors for signs of shorts to 12 volts or open circuits. Repair or replace any damaged wires.
  • Verify Power Supply:
    • Ensure that the power supply to the stepper motors 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.
  • Monitor Voltage:
    • Continuously monitor the voltage at the stepper motor 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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