SSU 000168.03 – Supply Voltage Too High

SSU 000168.03 (SSU 168.03)

Code: 000168.03

Shortcode: 168.03


This diagnostic trouble code (DTC), SSU 000168.03, is triggered if the battery voltage rises above 16 volts for longer than 320 milliseconds. This indicates an overvoltage condition that can be harmful to the electrical components of the equipment.


When this error is detected, the equipment may take protective measures, such as shutting down or limiting certain functions to prevent damage due to high voltage.


Inspect Charging System:

  • Check the alternator and voltage regulator for proper operation.
  • Ensure that the charging system is not overcharging the battery.

Examine Battery:

  • Inspect the battery for signs of damage or failure. Replace the battery if it is found to be defective.

Verify Electrical Connections:

  • Inspect the wiring and connectors for any signs of damage, loose connections, or corrosion.
  • Ensure that all electrical connections are secure and free of contaminants.

Monitor Voltage Levels:

  • Use diagnostic tools to monitor the voltage levels in the system and ensure they remain within the acceptable range.

Consult Technical Support:

  • If the error persists after performing the above steps, consult technical support or the manufacturer for further assistance in identifying and resolving the issue.


  • Regular monitoring and maintenance of the charging system and battery can help prevent overvoltage conditions.
  • Ensure that all software updates are applied promptly to maintain compatibility and reliability of the vehicle’s electrical systems.

Control Units: John Deere

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