GMC SIERRA 2020 Owner's Manual page 229

228 Driving and Operating
Warning
If equipped with four-wheel drive,
the vehicle will be free to roll if the
transfer case is in N (Neutral),
even when the shift lever is in
P (Park). You or someone else
could be seriously injured. Be
sure the transfer case is in a drive
gear 2 , 4 , or 4
parking brake before placing the
transfer case in N (Neutral). See
Shifting Into Park 0 217.
Caution
Extended high-speed operation in
4 may damage or shorten the
life of the drivetrain.
An engagement noise and bump is
normal when shifting between 4
and 4 or N (Neutral), with the
engine running.
Shifting into 4 will turn Traction
Control and StabiliTrak/Electronic
Stability Control (ESC) off. See
Traction Control/Electronic Stability
Control 0 235.
Automatic Transfer Case
Two-Speed Transfer Case
or set the
If equipped, the transfer case
controls are used to shift into and
out of four-wheel drive.
To shift the transfer case, press the
desired button. The graphic in the
instrument cluster will flash while a
shift is in progress. The graphic
displayed will change to indicate the
setting requested.
When the shift is complete the
graphic will stop flashing. The DIC
message turns off once the shift is
complete. If the transfer case
cannot complete a shift request, it
will go back to its last chosen
setting.
The settings are:
N (Neutral) : Use only when the
vehicle needs to be towed. See
Recreational Vehicle Towing 0 424
or
Towing the Vehicle 0 424.
2 (Two-Wheel Drive High) : Use
for driving on most streets and
highways. The front axle is not
engaged. This setting provides the
best fuel economy.
AUTO (Automatic Four-Wheel
Drive) : Use when road surface
conditions are variable. When
driving in AUTO, the front axle is
engaged, and the vehicle's power is
sent to the front and rear wheels