GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - crc - 5/11/17
260
Driving and Operating
6-Speed Automatic Transmission
Gear before shifting from
D (Drive) to L (Manual Mode)
6th
5th
4th
3rd
2nd
1st
Range after shifting from
D (Drive) to L (Manual Mode)
L4
L4
L3
L2
L2
L1
8-Speed Automatic Transmission
Gear before
shifting from
D (Drive) to
L (Manual Mode)
8th
7th
6th
5th
4th
3rd
2nd
1st
Range after
shifting from
D (Drive) to
L (Manual Mode)
–
Tow/Haul not
engaged
L6
L6
L5
L4
L3
L3
L2
L1
Range after
shifting from
D (Drive) to
L (Manual Mode)
–
Tow/Haul engaged
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.