SSU 000168.04 – Supply Voltage Too Low

SSU 000168.04 (SSU 168.04)

Code: 000168.04

Shortcode: 168.04


This diagnostic trouble code (DTC), SSU 000168.04, is triggered if the battery voltage drops below 9 volts for longer than 320 milliseconds. This indicates an undervoltage condition that can affect the performance and reliability of the equipment’s electrical systems.


When this error is detected, the equipment may experience reduced functionality or fail to start. Critical systems may not operate correctly, leading to potential safety and operational issues.


Inspect Battery:

  • Check the battery for signs of damage or low charge. Charge or replace the battery if necessary.

Examine Charging System:

  • Ensure the alternator and voltage regulator are functioning properly to maintain adequate battery voltage.

Verify Electrical Connections:

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

Monitor Voltage Levels:

  • Use diagnostic tools to monitor system voltage and ensure it remains 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 maintenance of the battery and charging system can help prevent undervoltage conditions.
  • Ensure 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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