GMC T-Series 2007, Owner'S Manual

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You can only drive a short time on the battery.
Be sure to shut off the radio, the fan or any
unnecessary accessories and have the system
serviced.
Service Transmission Warning Light
If your vehicle has an Allison
®
automatic
transmission, certain transmission malfunctions
will turn this light on.
This light is located with
the auxiliary warning
lights in the center of
the instrument panel.
If this light comes on while you are driving, do not
use the transmission shift control or you may lose
forward gears. The computer for the transmission
senses a problem and chooses a gear to stay in so
that you can drive the vehicle in that gear. You may
not be able to drive as fast or back up when this
light is on.
Notice: If you continue driving your vehicle
after the transmission warning light comes on,
you could damage the transmission. While this
light is on, the transmission cannot operate
in all gears. If you attempt to shift gears, the
vehicle may not continue to move. Do not
attempt to shift gears while the transmission
warning light is on. Instead, drive directly to
an authorized dealer for service. If you cannot
drive to a dealer immediately, have the vehicle
towed.
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