GMC Sierra Owners Manual
Four-Wheel-Drive LightInstruments and Controls / Warning Lights, Gauges, and
Indicators / Four-Wheel-Drive Light
For vehicles equipped with the four-wheel-drive light, it comes on when a vehicle with a manual transfer case is shifted into four-wheel drive and the front axle engages.
Some delay between the shifting and the light coming on is normal.
See Four-Wheel Drive on page 9‑43 for more information.
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