2009 GMC Canyon Owner's Manual - Page 110

Use these buttons to shift into and out of four-wheel drive. You can choose from the following: 2 m (Two-Wheel High): This setting is for driving in most street and highway situations. The front axle is not engaged in two-wheel drive. 4 n (Four-Wheel Low): This setting also engages the front axle to give you extra traction. It sends the maximum power to all four wheels. You might choose four-wheel low if you were driving off-road in sand, mud, or deep snow and while climbing or descending steep hills. Shifting into Four-Wheel Low will turn Traction Control and StabiliTrak® off. See Traction Control System (TCS) on page 4-8 and StabiliTrak® System on page 4-6 for more information. Indicator lights in the buttons show you which setting you are in. The indicator lights will come on briefly when you turn on the ignition and one will stay on the selected setting. If the lights do not come on, you should take the vehicle in for service. An indicator light will flash while shifting. It will stay on when the shift is completed. If the transfer case does not shift, it will return to the last chosen setting. { CAUTION: Shifting the transfer case to Neutral can cause the vehicle to roll even if the transmission is in P (Park), or if you have a manual transmission, even if you are in gear. You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in Neutral. See Parking Brake on page 2-31. N (Neutral): Shift the vehicle's transfer case to N (Neutral) only when towing the vehicle. 4 m (Four-Wheel High): This setting engages the front axle to help drive the vehicle. Use four-wheel high when you need extra traction, such as on snowy or icy roads, or in most off-road situations. 2-28