SCC 000168.04 – SCC Unswitched Supply Voltage Low

SCC 000168.04 (SCC 168.04)

Code: 000168.04

Shortcode: 168.04


This error code indicates that the Selective Control Unit (SCC) has detected an unswitched supply voltage below 9.0 V. Low voltage can result from battery issues, poor electrical connections, or problems within the power distribution system.


When this code is detected, the SCC will trigger an indicator or alarm, alerting the operator but not disabling the functions immediately.


Check Battery Condition:

  • Inspect the battery for adequate charge and health. Ensure battery terminals are clean and secure.
  • Recharge or replace the battery if it is weak or faulty.

Inspect Electrical Connections:

  • Examine all electrical connections related to the SCC for signs of corrosion, looseness, or damage.
  • Clean and tighten any connections as needed.

Verify Alternator and Charging System:

  • Ensure the alternator is operating correctly and providing sufficient voltage.
  • Check the alternator belt for proper tension and condition. Replace or adjust if necessary.

Inspect Fuses and Relays:

  • Check all relevant fuses and relays in the SCC circuit. Replace any blown fuses or defective relays.

Monitor Voltage Levels:

  • Use a multimeter to monitor the voltage at the SCC to ensure it stays above 9.0 V during operation.


  • Low voltage can affect the performance of the SCC and other electronic components. Addressing low voltage issues promptly can prevent further operational problems.

By following these recommendations, you can effectively diagnose and resolve issues related to high and low unswitched supply voltage errors in the SCC, ensuring reliable equipment performance.

Control Units: John Deere

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