GMC 2016 Sierra Denali Owner's Manual page 19

18 In Brief
Transfer Case Controls
The vehicle will have one of two
styles of transfer case controls. Use
these controls to shift into and out of
the different four-wheel drive
modes.
Electronic Transfer Case
This transfer case knob is to the left
of the steering column.
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 0 331
or Trailer Towing 0 231.
4 (Four-Wheel Drive Low) : This
setting sends maximum power to all
four wheels. Choose Four-Wheel
Drive Low when driving in deep
sand, mud, or snow, and while
climbing or descending steep hills.
See Four-Wheel Drive 0 200.