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Service Transmission Warning Light
(If Equipped)
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. Using the transmission
shift control may result in the loss of 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 the service transmission warning light comes
on while you are driving, it is a warning that
making a transmission “range” change could
leave you stranded. The vehicle may not continue
to move if you change gears with the
transmission shift control. The transmission can’t
operate in all gears because something is wrong.
Leave the shift control alone and drive directly to
a GM dealer for service. If you can’t go in for
service immediately, have the vehicle towed.
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