GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - CRC - 2/18/20
236
Driving and Operating
hills or mountain grades, when towing,
or when hauling heavy loads. See
to activate Tow/
Haul Mode.
Tow/Haul Mode Grade Braking
Tow/Haul Mode Grade Braking is only
enabled while the Tow/Haul Mode is
selected and the vehicle is not in the Range
Selection Mode. See
.
Tow/Haul Mode Grade Braking assists in
maintaining desired vehicle speeds when
driving on downhill grades by using the
engine and transmission to slow the vehicle.
See
Drive Systems
Four-Wheel Drive
If equipped, four-wheel drive engages the
front axle for extra traction.
Read the appropriate section for transfer
case operation before using.
Caution
Do not drive on clean, dry pavement in
4
m
and 4
n
(if equipped) for an extended
period of time. These conditions may
cause premature wear on the vehicle
’
s
powertrain.
Driving on clean, dry pavement in 4
m
or
4
n
may:
.
Cause a vibration to be felt in the
steering system.
.
Cause tires to wear faster.
{
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
transmission is in P (Park). You or
someone else could be seriously injured.
Be sure the transfer case is in a drive
gear
—
2
m
, 4
m
, or 4
n
—
or set the
parking brake before placing the transfer
case in N (Neutral). See
Caution
Extended high-speed operation in 4
n
may damage or shorten the life of the
drivetrain.
An engagement noise and bump is normal
when shifting between 4
n
and 4
m
or
N (Neutral), with the engine running.
Shifting into 4
n
will turn Traction Control
and StabiliTrak/Electronic Stability Control
(ESC) off. See
Automatic Transfer Case
Two-Speed Transfer Case
