GMC SIERRA 2020 Owner's Manual page 248

The speedometer reading can be
displayed in either English or metric
units. See Instrument Cluster 0 126.
The increment value used depends
on the units displayed.
Switching Between ACC and
Regular Cruise Control
To switch between ACC and regular
cruise control, press and hold
A Driver Information Display (DIC)
message displays. See Vehicle
Messages 0 155.
ACC Indicator Regular Cruise
Control Indicator
When ACC is engaged, a green
indicator will be lit on the instrument
cluster and the following gap will be
displayed. When the regular cruise
control is engaged, a green
indicator will be lit on the instrument
cluster; the following gap will not
display.
When the vehicle is turned on, the
cruise control mode will be set to
the last mode used before the
vehicle was turned off.
Warning
.
Always check the cruise control
indicator on the instrument cluster
to determine which mode cruise
control is in before using the
feature. If ACC is not active, the
vehicle will not automatically
brake for other vehicles, which
could cause a crash if the brakes
are not applied manually. You and
others could be seriously injured
or killed.
Driving and Operating
Setting Adaptive Cruise Control
If is on when not in use, SET /
RES+ could be pressed by mistake
and engage ACC when not desired.
Keep off when cruise is not
being used.
Select the set speed desired for
ACC. This is the vehicle speed
when no vehicle is detected in
your path.
While the vehicle is moving, ACC
will not set at a speed less than 25
km/h (15 mph), although it can be
resumed when driving at lower
speeds.
To set ACC while moving:
1. Press .
2. Get up to the desired speed.
3. Press and release SET .
4. Remove foot from the
accelerator.
After ACC is set, it may immediately
apply the brakes if a vehicle ahead
is detected closer than the selected
following gap.
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