BIF 000168.18 – Control Unit Undervoltage Warning. John Deere System Advisory.

BIF 000168.18 (BIF 168.18)

Code: 000168.18

Shortcode: 168.18


This error code, BIF 000168.18, indicates that the control unit has detected a supply voltage that is below the acceptable limit, specifically less than 9 volts. Such low voltage levels can lead to insufficient power supply to the system’s components, affecting their performance and potentially causing system shutdowns or failures.


When the voltage falls below the threshold, the control unit may restrict or disable functions to protect the system from erratic operations and to preserve battery life.


  • Inspect Battery and Connections: Check the battery’s health and ensure that all connections are secure and free of corrosion. Replace the battery or repair connections if necessary.
  • Test Charging System: Ensure the alternator and other charging system components are functioning correctly to maintain adequate voltage levels.
  • Check for Electrical Drains: Identify any unnecessary electrical drains or devices that may be drawing power even when they should not be. Remove or disconnect these as needed.
  • Evaluate Wiring and Fuses: Look for any damaged wiring or blown fuses that could be causing a drop in voltage. Replace or repair these components to restore proper voltage levels.
  • Systematic Electrical Diagnostics: Conduct a thorough diagnostic test of the electrical system to pinpoint any less obvious issues contributing to the low voltage condition.


Maintaining a stable voltage supply is critical for the reliable operation of all electronic systems within the equipment. Regular monitoring and proactive maintenance of the electrical system can prevent issues related to undervoltage, thereby enhancing the longevity and efficiency of the machinery.

Control Units: John Deere

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