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.