Tow/Haul Mode; Drive Systems; Four-Wheel Drive - GMC SIERRA 2020 Owner's Manual

Tow/Haul Mode

The Tow/Haul Mode adjusts the
transmission shift pattern to reduce
shift cycling. This provides
increased performance, vehicle
control, and enhanced transmission
and engine cooling when driving
down steep hills or mountain
grades, when towing, or when
hauling heavy loads. See Driver
Mode Control 0 238 to activate Tow/
Haul Mode.
For vehicles without Driver Mode
Control, press the Tow/Haul button
on the center stack.
If equipped, the Stop/Start system
will become unavailable when Tow/
Haul Mode is active.
Tow/Haul Mode Grade Braking
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 Manual Mode 0 224. 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.
See Towing Equipment 0 296.
Driving and Operating

Drive Systems

Four-Wheel Drive

If equipped, four-wheel drive
engages the front axle for extra
traction.
Read the appropriate section for
transfer case operation before
using.
Caution
Do not drive on clean, dry
pavement in 4 and 4 (if
equipped) for an extended period
of time. These conditions may
cause premature wear on the
vehicle s powertrain.
Driving on clean, dry pavement in
4 or 4 may:
Cause a vibration to be felt in
the steering system.
Cause tires to wear faster.
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