GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13337776) - 2020 - CRC - 8/27/19
226
Driving and Operating
10-Speed Automatic Transmission
Gear before shifting from D (Drive) to
L (Manual Mode)
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Range after shifting from D (Drive) to
L (Manual Mode) - Tow/Haul not engaged
L7
L7
L7
L6
L5
L4
L3
L3
L2
L1
Range after shifting from D (Drive) to
L (Manual Mode) - Tow/Haul engaged
L7
L7
L6
L5
L4
L3
L3
L3
L2
L1
Grade Braking is not available when
Range Selection Mode is active.
See
.
While using Range Selection Mode,
cruise control and the Tow/Haul
Mode can be used.
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.
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 the vehicle
is stuck, do not spin the tires.
When stopping on a hill, use the
brakes to hold the vehicle in
place.
Low Traction Mode
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 L2 using
Range Selection Mode. This will
limit torque to the wheels and help
prevent the tires from spinning.