GMC SIERRA 2020 Owner's Manual page 241

240 Driving and Operating
StabiliTrak/Electronic Stability
Control (ESC), the Antilock Brake
System (ABS), and the Traction
Control System (TCS) will change
for optimal off-road performance.
Use this mode for public off-road
recreational driving. See Off-Road
Driving 0 191.
When selected, the Off-Road Mode
indicator light displays in the
instrument cluster.
Tow/Haul Mode : This feature
assists when pulling a heavy trailer
or a heavy load. See Tow/Haul
Mode 0 227.
Tow/Haul Mode is designed to be
most effective when the vehicle and
trailer combined weight is at least
75% of the vehicle s Gross
Combined Weight Rating (GCWR).
See Weight of the Trailer under
Trailer Towing 0 292.
Tow/Haul Mode is most useful when
pulling a heavy trailer or a heavy
load under the following conditions:
Through rolling terrain
In stop-and-go traffic
In busy parking lots where
improved low speed control of
the vehicle is desired
Operating the vehicle in Tow/Haul
Mode when lightly loaded or with no
trailer at all will not cause damage.
However, there is no benefit to
selecting Tow/Haul Mode when the
vehicle is unloaded. Such a
selection when unloaded may result
in unpleasant engine and
transmission driving characteristics,
heavy or light steering, and reduced
fuel economy.
When selected, the Tow/Haul Mode
light will display in the instrument
cluster.
If the vehicle is turned off with Tow/
Haul Mode active and then restarted
within four hours or less, Tow/Haul
will remain active. Otherwise the
vehicle will start in Normal Mode.
Terrain Mode : Use for finer
control during low speed, off-road
driving. When using this mode it will
mimic the characteristics of
four-wheel-drive low (4 ) without
the torque capabilities.
Use when:
Traveling on very rough roads at
very low speeds, such as a
two-track or heavily rutted road.
Traveling slowly in grassy fields.
Pulling a boat out of the water
on a trailer.
Using the vehicle for public
off-road recreational driving. See
Off-Road Driving 0 191 and
Hill and Mountain Roads 0 197.
When in Terrain Mode, the vehicle
will shift automatically but may hold
a lower gear longer to maximize
engine torque. The steering will
change to provide more precise
control. A unique pedal map,
transmission shift pattern, and rpm
control are utilized to give better
control at lower speeds and over
rough terrain. When the vehicle
comes to a stop, Vehicle Hold is
engaged. TCS will be optimized for
maximum torque transfer across
axles, and Active Braking During Lift
Throttle will be engaged.