Drive Systems; Four-Wheel Drive; Speed Automatic - GMC 2013 Yukon/Yukon XL Owner's Manual

9-34 Driving and Operating
When Tow/Haul Mode is selected
the tow/haul indicator light will come
on. See
.
The Tow/Haul Mode works with the
®
Autoride feature, if the vehicle has
this, to enhance the ride when
trailering or with a loaded vehicle.
See
.
Tow/Haul Mode Grade Braking

(6-Speed Automatic

Transmission)
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 listed
previously and
. 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.
To disable or enable Tow/Haul
Grade Braking within the current
ignition key cycle, press and hold
the Tow/Haul button for
three seconds. A DIC message will
be displayed. See
See
for more information.
For other forms of grade braking,
see
and
.

Drive Systems

Four-Wheel Drive (Two
Speed Automatic
Transfer Case)
If the vehicle has four-wheel drive,
you can send the engine's driving
power to all four wheels for extra
traction. Read the following before
.
using four-wheel drive.
pavement in Four-Wheel Drive
High or Four-Wheel Drive Low for
an extended period of time may
cause premature wear on the
vehicle's powertrain. Do not drive
on clean, dry pavement in
Four-Wheel Drive High or
Four-Wheel Drive Low for
extended periods of time.
While driving on clean dry pavement
and during tight turns, you may
experience a vibration in the
steering system.
Driving on clean, dry