Warning – GMC 2010 Sierra User Manual
Page 183
2
m
(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.
4
m
(Four-Wheel-Drive High): Use the
Four-Wheel-Drive High position when extra traction is
needed, such as on snowy or icy roads or in most
off-road situations. This setting also engages the front
axle to help drive the vehicle. This is the best setting to
use when plowing snow.
4
n
(Four-Wheel-Drive Low): This setting also engages
the front axle and delivers extra torque. You may never
need this setting. It sends maximum power to all four
wheels. You might choose Four-Wheel-Drive Low while
driving off-road in deep sand, deep mud, deep snow,
and while climbing or descending steep hills.
If the vehicle has StabiliTrak
®
, shifting into
Four-Wheel-Drive Low will turn Traction Control and
StabiliTrak
®
off. See StabiliTrak
{
WARNING:
Shifting the transfer case to N (Neutral) can cause
the vehicle to roll even if the transmission is in
P (Park). You or someone else could be seriously
injured. Be sure to set the parking brake before
placing the transfer case in N (Neutral). See
Parking Brake on page 3‑54.
N (Neutral): Shift the vehicle's transfer case to
N (Neutral) only when towing the vehicle. See
Recreational Vehicle Towing on page 5‑49 or Towing
Your Vehicle on page 5‑48 for more information.
If the SERVICE 4–WHEEL DRIVE message stays on,
you should take the vehicle to your dealer for service.
See “Service 4–Wheel Drive message” under DIC
Warnings and Messages on page 4‑66.
3-45