Manual Mode - GMC Sierra Denali 2500HD 2014 Owner's Manual

GMC Sierra Denali 2500HD and 3500HD (GMNA-Localizing-U.S./Canada-
7142957) - 2014 - CRC 1st Edition - 3/28/13
some shifts may feel different as the
transmission determines the best
settings for a particular shift.
When temperatures are very cold,
the transmission's gear shifting may
be delayed in providing more stable
shifts until the engine warms up.
Shifts may be more noticeable with
a cold transmission. This difference
in shifting is normal.
M (Manual Mode): This position
lets drivers select the range of gears
appropriate for current driving
conditions. See Range Selection
Mode under Manual Mode on
page 9-33.
Notice: 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.
Normal Mode Grade Braking
Normal Mode Grade Braking is
enabled when the vehicle is started,
but is not enabled in Range
Selection Mode. It assists in
maintaining desired vehicle speeds
when driving on downhill grades by
using the engine and transmission
to slow the vehicle. The first time
the system engages for each
ignition key cycle, a DIC message
will be displayed. See Transmission
Messages on page 5-42.
To disable or enable Normal Mode
Grade Braking within the current
ignition key cycle, press and hold
the Tow/Haul button for
three seconds. A DIC message
displays. See Transmission
Messages on page 5-42.
For information on other forms of
grade braking, see Tow/Haul Mode
on page 9-34 and Cruise Control on
page 9-45.
Black plate (33,1)
Driving and Operating

Manual Mode

Range Selection Mode
On vehicles with a Range Selection
Mode, this feature may be used to
control the vehicle's transmission.
To use this feature, do the following:
1. Move the shift lever to
M (Manual Mode).
2. Press the plus/minus buttons to
upshift or downshift, selecting
the desired range of gears for
current driving conditions.
When in M (Manual Mode) a number
displays next to the M, indicating the
current gear that has been selected.
The number displayed in the gear
indicator is the highest gear that can
be used. However, the vehicle can
9-33