GMC 2010 Yukon/Yukon XL Owner's Manual page 189

Automatic Transfer Case
Use this dial to shift into and out of four-wheel drive.
The vehicle has Four-Wheel-Drive with StabiliTrak
For information on StabiliTrak
on page 5 6.
You can choose among three driving settings:
Indicator lights in the switch show you which setting you
are in. The indicator lights will come on briefly when you
turn on the ignition and the last chosen setting will stay
on. If the lights do not come on, you should take the
vehicle to your dealer for service. An indicator light will
The transfer case knob is
located to the left of the
instrument panel cluster.
®
.
® ®
, see StabiliTrak System
flash while shifting. It will stay on when the shift is
completed. If for some reason the transfer case cannot
make a requested shift, it will return to the last chosen
setting.
2 (Two-Wheel Drive High): 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.
AUTO (Automatic Four-Wheel Drive): This setting is
ideal for use when road surface traction conditions are
variable. When driving the vehicle in AUTO, the front
axle is engaged, but the vehicle's power is primarily
sent to the rear wheels. When the vehicle's software
determines a need for more traction, the system will
transfer more power to the front wheels. Driving in
this mode results in slightly lower fuel economy than
Two-Wheel Drive High.
4 (Four-Wheel Drive High): Use the four-wheel
high position when you need extra traction, such as
on snowy or icy roads or in most off-road situations.
This setting also engages the front axle to help drive
the vehicle. This is the best setting to use when
plowing snow.
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