GMC Sierra Instruction Manual page 290

6-Speed Automatic Transmission
Gear before shifting from D
(Drive) to M (Manual Mode)
Range after shifting from D
(Drive) to M (Manual Mode)
8-Speed Automatic Transmission
Gear before shifting
from D (Drive) to M 8th
(Manual Mode)
Range after shifting
from D (Drive) to
M (Manual Mode) M6
Tow/Haul not
engaged
Range after shifting
from D (Drive) to
M6
M (Manual Mode)
Tow/Haul engaged
Grade Braking is not available when
Range Selection Mode is active.
See Tow/Haul Mode 0 290.
While using Range Selection Mode,
cruise control and the Tow/Haul
Mode can be used.
6th 5th 4th
M4 M4 M3
7th 6th 5th 4th
M6 M5 M4 M3
M5 M4 M3 M3
If the vehicle has an exhaust brake,
it can also be used, but will not
automatically downshift the
transmission. See Exhaust Brake
in the Duramax diesel supplement.
I n f o r ma t i o n P r o v i d e d b y :
Driving and Operating
3rd 2nd 1st
M2 M2 M1
3rd 2nd 1st
Low Traction Mode
M3 M2 M1
If equipped, Low Traction Mode
assists in vehicle acceleration when
road conditions are slippery, such
as with ice or snow. While the
vehicle is at a stop, select M2 using
M3 M2 M1
Range Selection Mode. This will
limit torque to the wheels and help
to prevent the tires from spinning.
Caution
Spinning the tires or holding the
vehicle in one place on a hill
using only the accelerator pedal
may damage the transmission.
The repair will not be covered by
the vehicle warranty. If you are
stuck, do not spin the tires. When
stopping on a hill, use the brakes
to hold the vehicle in place.
289