GMC YUKON XL 2004 Owner's Manual page 122

Tow/Haul Mode
Your vehicle may be equipped with a Tow/Haul mode. If
so, the selector button is located on the end of the
column shift lever. You can use this feature to assist
when towing or hauling a heavy load. See Towing
a Trailer on page 4-63 for more information.
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The Tow/Haul mode also interacts with the Autoride™
feature, if your vehicle is so equipped, to enhance
the ride when trailering or with a loaded vehicle. See
Autoride™ on page 4-62.
Four-Wheel Drive
If your vehicle has four-wheel drive, you can send your
engine's driving power to all four wheels for extra traction.
To get the most satisfaction out of four-wheel drive, you
must be familiar with its operation. Read the part that
follows before using four-wheel drive. See the
appropriate text for the transfer case in your vehicle.
Notice: Driving on pavement in four-wheel drive for
an extended period of time may cause premature
wear on your vehicle's powertrain. Do not drive
in four-wheel drive on pavement for extended
periods of time.
When Tow/Haul mode is
selected the Tow/Haul
indicator light will
illuminate.