Chevrolet 2010 Corvette Convertible Owner's Manual page 126

If the vehicle has a Navigation system, see Head-Up
Display (HUD) in the Index of the navigation manual.
The Manual Paddle Shift system will not allow either an
up-shift or a down-shift if the vehicle speed is too fast
or too slow, nor will it allow a start from 4 (Fourth) or
higher gear
If up-shifting does not occur when needed, vehicle
speed will be limited to protect the engine.
When the transmission gear does not respond to a shift
change, the DIC will show an X over the gear display.
3-30
When using the Manual
Paddle Shift feature while
in S (Sport Mode), the
current gear will be
displayed in the Driver
Information (DIC), or the
Head-Up Display (HUD),
if the vehicle has either of
these features.
If the vehicle has a HUD, and the transmission gear
does not respond to a shift change, a chime will sound
and the HUD will momentarily show an X over the gear
display.
Manual Paddle Shift operation is available for use with
Cruise Control. See
more information.
The vehicle speeds required for Manual Paddle Shift
up-shifts depend on several vehicle inputs, which will
vary the allowed up-shift speed by a few mph (km/h).
When a requested shift is
denied due to the speed
restrictions shown, the
DIC will momentarily
show an X over the gear
display and a chime will
sound.
for