Tow/Haul Mode - GMC 2010 Sierra Denali Owner's Manual

Tow/Haul Mode

The vehicle has a tow/haul mode. The tow/haul mode
adjusts the transmission shift pattern to reduce shift
cycling, providing increased performance, vehicle
control, and transmission cooling while towing or
hauling heavy loads.
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Press the button located on the end of the shift lever to
turn the tow/haul on or off. While the tow/haul is on, a
light on the instrument panel cluster comes on.
See Tow/Haul Mode Light on page 4 43 for more
information.
Also see Tow Haul Mode under Towing a Trailer on
page 5 42 for more information.