Antilock Brake; System (Abs); Brakes - GMC Yukon Denali 2015 Owner's Manual

9-38 Driving and Operating
The settings are:
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
traction 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 automatically based on
driving conditions. This setting
provides slightly lower fuel economy
than 2 .
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 position when extra traction is
needed, such as when driving on
snowy or icy roads, when
off-roading, or when plowing snow.
Service Four-Wheel Drive
If the SERVICE 4WD message
stays on, you should take the
vehicle to your dealer for service.
See SERVICE 4WD message
under Transmission Messages on
page 5-46.
Shifting Into 4 or AUTO
Turn the knob to the 4 or AUTO
position. This can be done at any
speed. The indicator light will flash
while shifting. It will remain on when
the shift is completed.
Shifting Into 2
Turn the knob to the 2 position.
This can be done at any speed.
The indicator light will flash while
shifting. It will remain on when the
shift is completed.

Brakes

Antilock Brake

System (ABS)

This vehicle has ABS, an advanced
electronic braking system that helps
prevent a braking skid.
When the vehicle begins to drive
away, ABS checks itself.
A momentary motor or clicking noise
might be heard while this test is
going on, and it might even be
noticed that the brake pedal moves
a little. This is normal.
If there is a problem with ABS, this
warning light stays on. See Antilock
Brake System (ABS) Warning Light
on page 5-22.