Tow/Haul Mode - GMC Sierra 2005 Owner's Manual

Tow/Haul Mode

If your vehicle has an automatic transmission, it may
be equipped with a Tow/Haul mode. 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. Turn Tow/Haul on and off by pressing
the button until the Tow/Haul indicator light illuminates
on the instrument panel.
2-30
Tow/Haul is a feature on automatic transmission
equipped vehicles that assists when pulling a heavy
trailer or large or heavy load. Tow/Haul mode adjusts
the transmission's shift pattern to reduce shift cycling,
providing increased performance, vehicle control, and
transmission cooling when towing or hauling heavy loads.
If your vehicle is equipped with an Allison
you may have both Tow/Haul mode and overdrive
disable. See "Tow/Haul Mode" under Towing a Trailer
on page 4-68 for more information.
Grade Braking
(Allison Transmission
Grade braking uses the engine and transmission
to slow a loaded vehicle on hills in addition to using
the brakes, saving on brake wear and increasing
vehicle stability. The Allison Transmission
sensing the driver's desire to slow down while driving
downhill, will automatically shift to the next lower
gear range to assist in slowing down the vehicle.
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