GMC 2012 Sierra Denali Owner's Manual page 279

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The transfer case knob is located
next to the steering column.
Use the dial to shift into and out of
Four-Wheel Drive.
Normal
Severe
Extreme
Vehicle in Tow*
*See
.
You can choose among four driving
settings.
Indicator lights in the dial show
which setting you are in. The
indicator lights will come on briefly
when you turn on the ignition and
one will stay on. If the lights do not
come on, you should take the
vehicle to your dealer for service.
An indicator light flashes while
shifting the transfer case and
remains illuminated when the
shift is complete.
YES
YES
YES
or
If for some reason the transfer case
cannot make a requested shift, it will
return to the last chosen setting.
This setting is used for driving in
most street and highway situations.
The front axle is not engaged in
Two-Wheel Drive. This setting also
provides the best fuel economy.
YES

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