Tow/Haui Mode; Overdrive Disable - GMC 2003 Sierra 1500 Pickup Owner's Manual

Tow/HauI Mode (Automatic
Transmission)
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Your vehicle 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. See "Tow/Haul
Mode" under Towing a Trailer on page 4-66 for more
information.
Overdrive Disable (Allison
Transmissions)
If your vehicle has an Allison Transmission you may
have the overdrive disable feature. The overdrive disable
feature prevents the transmission from shifting into
fifth (5) gear. The selector button is located on the end
of the column shift lever. You can turn overdrive
disable on and off by pressing and holding the button at
the end of the column shift lever until the indicator
light, on the instrument panel, illuminates.
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