GMC Sierra 2010 Owner's Manual page 177

Electronic Transfer Case
Use the dial to shift into and out of four-wheel drive.
Recommended Transfer Case Settings
Driving Conditions
Normal
Severe
Extreme
Vehicle in Tow*
*See Recreational Vehicle Towing on page 5 43 or
Towing Your Vehicle on page 5 43
The transfer case knob
is located next to the
steering column.
Transfer Case Settings
2 4 4
YES
YES
YES
You can choose among four driving settings:
Indicator lights in the dial show which setting you are in.
The indicator lights will come on briefly when you
turn on the ignition and one will stay on. If the lights
do not come on, you should take the vehicle to your
dealer/retailer for service. An indicator light flashes
while shifting the transfer case and remains illuminated
when the shift is complete. If for some reason the
transfer case cannot make a requested shift, it will
return to the last chosen setting.
2 (Two-Wheel-Drive High): This setting is used for
driving in most street and highway situations. The front
axle is not engaged in Two-Wheel Drive. This setting
also provides the best fuel economy.
N
YES
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