GMC SIERRA 2020 Owner's Manual page 242

Active Braking During Lift Throttle:
Automatically applies light
braking, similar to heavy engine
braking of four-wheel-drive low.
Applies light braking in D (Drive)
until the vehicle is at idle
speeds. In Manual L1 and
Manual L2, moderate braking
may stop the vehicle.
Reduces trailer braking.
Terrain Mode
Drive Select Expected Vehicle Behavior
Minor deceleration when off
throttle and mild ability to
Drive (L3-Lx) modulate throttle; mimics
performance of 4 without
torque multiplication.
Moderate deceleration when
off throttle and moderate
L2 ability to modulate throttle;
will bring vehicle to a stop in
most cases.
Significant deceleration when
off throttle and significant
L1 ability to modulate throttle;
will bring vehicle to a stop in
most cases.
Active Braking During Lift Throttle
will reduce the back and forth
between the accelerator and brake
pedals.
Driving and Operating
Ideal Terrain
Grassy fields,
mild two tracks,
rutted roads,
large rolling hills,
Mild rock crawling,
heavy ruts,
short, steeper grades,
Rock crawling downhill
Vehicle Hold Features:
When the vehicle comes to a
stop on an incline grade in
forward gear or on a decline
grade in reverse gear, Vehicle
Hold is engaged until the
accelerator pedal is pressed.
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