Vehicle Features - GMC Sierra 2015 Owner's Manual

Automatic Transfer Case
This transfer case knob is to the left
of the steering column.
The different drive options that may
be available are described following.
2 (Two-Wheel Drive High): This
setting is used for driving in most
street and highway situations.
AUTO (Automatic Four-Wheel
Drive): This setting is ideal for use
when road surface traction
conditions are variable.
Do not use AUTO mode to park on
a steep grade with poor traction
such as ice, snow, mud or gravel. In
AUTO mode only the rear wheels
will hold the vehicle from sliding
when parked. If parking on a steep
grade, use 4 to keep all four
wheels engaged.
4 (Four-Wheel Drive High): Use
this setting when extra traction is
needed, such as on snowy or icy
roads or in most off-road situations.
N (Neutral): Shift to this setting
only when towing the vehicle. See
Recreational Vehicle Towing on
page 10-94 or Trailer Towing on
page 9-72.
4 (Four-Wheel Drive Low): This
setting sends maximum power to all
four wheels. Choose 4 when
driving in deep sand, mud, or snow,
and while climbing or descending
steep hills.
See Four-Wheel Drive on
page 9-39.
In Brief

Vehicle Features

Infotainment System
The base radio and base radio with
connectivity information is included
in this manual. See the infotainment
manual for information on the
uplevel radios, audio players,
phone, navigation system, Rear
Seat Entertainment (RSE), and
voice or speech recognition,
if equipped.
Radio(s)
O
: Press to turn the system on.
Press and hold to turn it off. When
on, press to mute; press again to
unmute. Turn to increase or
decrease the volume.
RADIO: Press to choose between
®
FM, AM, and SiriusXM
if equipped.
MEDIA: Press to change the audio
source between CD, USB, SD card,
®
AUX, and Bluetooth Audio,
if equipped.
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