DTI 000168.04 – Low Supply Voltage Detected in Control Unit (BAT)

DTI 000168.04 (DTI 168.04)

Code: 000168.04

Shortcode: 168.04


This diagnostic trouble code (DTC) indicates that the supply voltage at the BAT input of the control unit is below 9 volts. Low voltage can significantly affect the operational capabilities of the control unit, potentially leading to reduced performance or failure of electronic systems. Common causes include a failing battery, inadequate charging, or excessive electrical resistance within the system.


Operational constraints may be imposed by the control unit to conserve power and protect sensitive electronics, which may include partial shutdowns or restricted functionality.


  • Evaluate Battery and Charging System: Ensure that the battery is in good condition and that the charging system is effectively maintaining battery charge.
  • Inspect Electrical Wiring and Connections: Look for and rectify any issues such as corrosion, loose connections, or damaged wires that could be causing voltage drops.
  • Routine Maintenance and Testing: Regular maintenance schedules should include testing of the electrical system to prevent occurrences of low voltage.


Regular maintenance is key to preventing voltage-related issues and ensuring the longevity and reliability of the machinery.

Control Units: John Deere

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