GMC Yukon 2021 - Drive Systems; Four-Wheel Drive

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 Driver
Mode Control 0 245 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 Manual Mode 0 235.
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 Towing Equipment 0 287.
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.
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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 Shifting Into Park
0 230.
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 Traction Control/Electronic
Stability Control 0 242.
Automatic Transfer Case
Two-Speed Transfer Case