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

242 Driving and Operating
be completed. Slow the vehicle, then tap the
left steering wheel control to the desired
lower gear range.
Cruise control can be used while in ERS.

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 0 251 to activate Tow/
Haul Mode.
For vehicles without Driver Mode Control,
press the Tow/Haul button on the center
stack.
If equipped with Active Hydraulic Assist, the
vehicle will provide a stiffer steering
response when Tow/Haul mode is engaged
to provide enhanced steering functionality.
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 0 241.
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 0 282.

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.
Warning
If equipped with four-wheel drive, the
vehicle will be free to roll if the transfer
case is in N (Neutral), even when the shift
lever is in P (Park). You or someone else
could be seriously injured. Be sure the
transfer case is in a drive gear
or 4 or set the parking brake before
placing the transfer case in N (Neutral).
See Shifting Into Park 0 236.
2 , 4 ,