SCO 516122.03 – Stepper Motor for E-SCV X, Supply Voltage Too High

SCO 516122.03 (SCO )

Code: 516122.03



This error code, SCO 516122.03, indicates that the supply voltage (BAT) for the stepper motor of E-SCV X has risen above 16 volts. Excessive voltage can damage the stepper motor and prevent it from functioning correctly.


When this fault is detected, the control software may have limited functionality or may cease to function altogether, resulting in limited or no function of the selective control valve (E-SCV X).


  • Inspect Charging System:
    • Ensure that the charging system, including the alternator and voltage regulator, is functioning correctly. Replace any faulty components.
  • Check for Overvoltage Conditions:
    • Investigate any possible causes of overvoltage, such as external charging sources or malfunctioning equipment.
  • Test Electrical Components:
    • Test other electrical components for signs of damage due to overvoltage and replace as necessary.
  • Monitor Voltage:
    • Continuously monitor the supply voltage to ensure it stays within the recommended range.


Preventive Maintenance:

  • Regular maintenance and inspection of the charging system can help prevent overvoltage conditions and protect the stepper motor.

Control Units: John Deere

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