Cadillac 2012 CTS Owner's Manual page 280

9-30 Driving and Operating
To use the DSC feature using the
Tap Shift controls:
1. Move the shift lever to
the right from D (Drive) to
M (Manual Mode).
2. Tap the left control to downshift,
and the right control to upshift.
3. To return to sport mode, hold the
right upshift control briefly,
or hold the shift lever forward
briefly, or return the shift lever to
D (Drive).
With the shift lever in D (Drive), the
tap shift controls will activate a
temporary tap manual shift mode,
allowing the transmission to be
manually shifted. Automatic shifts
return after no manual shifts have
been done for seven to 10 second.
The temporary tap mode can also
be deactivated by holding the right
upshift control briefly.
The tachometer display indicates
which gear the vehicle is in. The
number indicates the requested
gear range when moving the shift
lever forward or rearward.
CTS-V vehicles use tracer lights
around the outside of the
tachometer as a performance
upshift light. These tracers flash to
indicate when to shift to the next
higher gear to avoid the engine
speed limit. See
for more information.
While using the DSC feature, the
vehicle will have firmer, quicker
shifting. You can use this for sport
driving or when climbing or
descending hills, to stay in gear
longer, or to downshift for more
power or engine braking.
The transmission will only allow
you to shift into gears appropriate
for the vehicle speed and engine
revolutions per minute (RPM). The
transmission will not automatically
shift to the next lower gear if the
engine rpm is too high, nor to the
next higher gear when the maximum
engine rpm is reached.
If shifting is prevented for any
reason, the currently selected gear
will flash multiple times, indicating
that the transmission has not shifted
gears.