2018 CADILLAC CT6 Mode

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
222 DRIVING AND OPERATING
too much gasoline. Try pushing
the accelerator pedal all the way
to the floor and holding it there
as you press ENGINE START/
STOP. Wait at least 15 seconds
between each try, to allow the
cranking motor to cool down.
When the engine starts, release
the accelerator. If the vehicle
starts briefly but then stops
again, do the same thing. This
clears the extra gasoline from the
engine. Do not race the engine
immediately after starting it.
Operate the engine and
transmission gently until the oil
warms up and lubricates all
moving parts.
Stop/Start System
{Warning
Exiting the vehicle without first
shifting into P (Park) may cause the
vehicle to move. You or others may
be injured. Because the vehicle may
have an auto engine stop/start
feature, the vehicle's engine might(Continued)
Warning (Continued)
seem to be shut off; however, once
the brake pedal is released, the
engine will start up again.
Shift to P (Park) and turn the
ignition off before exiting the
vehicle.
The vehicle has a fuel saving stop/
start system to shut off the engine
and help conserve fuel.
Auto Engine Stop/Start
When the brakes are applied and the
vehicle is at a complete stop, the
engine may turn off. When stopped,
the tachometer may display Auto
Stop, or the Auto Stop light may come
on in the instrument cluster.
See Tachometer 0134 and Auto Stop
Mode (Uplevel Cluster) 0150. When the
brake pedal is released or the
accelerator pedal is pressed, the
engine may restart.
Auto Stop may be deactivated if:
. A minimum vehicle speed is not
reached. .
The engine or transmission is not
at the required operating
temperature.
. The outside temperature is not in
the required operating range,
typically between -10 °C (14 °F)
and 50 °C (122 °F).
. The shift lever is in any gear other
than D (Drive).
. The battery has been recently
disconnected.
. The battery charge is low.
. The interior comfort level has not
reached the required level for the
climate control system or defog
settings.
See Automatic Climate Control
System (Quad Zone - Gasoline Only)
0 197 orAutomatic Climate Control
System (Dual Zone - Gasoline and
PLUG-IN) 0191.
. The Auto Stop time is greater than
two minutes.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
226 DRIVING AND OPERATING
Extended Parking
It is better not to park with the
vehicle running. If the vehicle is left
while running, follow the proper steps
to be sure the vehicle will not move
and there is adequate ventilation.
SeeShifting Into Park 0224 and Engine
Exhaust 0230.
If the vehicle is left parked while
running and the Remote Keyless
Entry (RKE) transmitter is outside the
vehicle, the vehicle will turn off after
one hour. If the vehicle is left parked
while running and the RKE
transmitter is inside, the vehicle will
turn off after two hours.
The timer will reset if the vehicle is
taken out of P (Park) while it is
running.
Electric Vehicle
Operating Modes
Driver Selected Operating
Modes (PLUG-IN Only)
For gasoline only engines see Driver
Mode Control (Gasoline Only) 0241.
While driving with PLUG-IN or
gasoline propulsion, additional
operating modes can be selected.
Press MODE to display selectable drive
modes in the Driver Information
Center (DIC). Continue pressing to
scroll through the modes. During some conditions, certain drive
modes may be unavailable. The
unavailable mode is grayed out in the
DIC menu and cannot be selected.
Tour
Mode
The vehicle is in Tour Mode when the
menu item Tour is selected. Use Tour
Mode whenever possible. Each time
the vehicle is started it will start in
Tour Mode.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
DRIVING AND OPERATING 227
SportMode
Sport Mode provides more responsive
acceleration than Tour Mode, but can
reduce efficiency. Use Tour Mode
whenever possible.
During some conditions, certain drive
modes may be unavailable. The
unavailable mode is grayed out in the
DIC menu and cannot be selected.
If in Sport or Hold Mode, the mode
may become unavailable and the
vehicle will return to Tour Mode. The
indicator light goes off and a DIC
message displays.
Press MODE to select Sport Mode. Press MODE again to return to Tour
Mode and it becomes active after
three seconds.
Hold
Mode
Use Hold Mode on a trip where it is
expected that all of the electric charge
will be depleted. Use Hold Mode
mainly during highway or high speed
driving to maximize both PLUG-IN
propulsion miles and fuel efficiency.
This mode places the remaining
battery charge into a reserve for the
driver to use as desired. Selecting this
mode transitions the vehicle to
gasoline propulsion to maintain the battery charge reserve. The reserve
battery charge will appear grayed out
while in this mode.
Upon exiting Hold Mode, the reserved
battery charge becomes available
again and the vehicle returns to
PLUG-IN propulsion.
Hold Mode will not change normal
vehicle acceleration or braking
performance.
Press MODE to select Hold Mode.
Press MODE again to return to Tour
Mode and it becomes active after
three seconds.
Out of Fuel/Engine
Unavailable
If the vehicle runs out of fuel, or the
engine will not start due to a
malfunction, the vehicle can continue
to be driven with electric propulsion
until the current charge is depleted.
The vehicle will have less responsive
acceleration. DIC messages indicate
reduced propulsion power, that the
engine is not available, and the need
for fuel or service.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
228 DRIVING AND OPERATING
Once the vehicle is refueled, or the
malfunction is corrected, the engine
will start the next time the vehicle is
turned on to perform a self test, and
DIC messages will not be displayed.
Once the engine starts successfully,
normal operation will continue with
either electric propulsion or with the
engine running. The engine will stop
running after the self test is
completed, and based on the current
mode of operation.
Maintenance Modes
Engine Maintenance Mode (EMM)
EMM runs the engine to keep it in
good working condition after
approximately six weeks of no or very
limited engine operation. EMM will
force the engine to run, even if there
is a charge to power the vehicle.
When EMM is needed, the EMM
Request screen appears on the
infotainment display at vehicle start.
If Yes is selected, EMM will begin. The
engine will not start until after a short
delay once shifted into D (Drive). The
engine will run for a set amount of
time without turning off. During
EMM, a DIC message displays to show
the EMM percentage complete.
If No is selected, the EMM Request
screen will appear when the vehicle is
next started. The EMM request can be
delayed for up to one day.
If the EMM request was delayed for
one day, EMM will automatically start
the engine at the next vehicle start.
The engine will not start until after a
short delay once shifted into D (Drive).An EMM Notification screen will
appear in the infotainment display.
If the vehicle is shut off during EMM,
it will restart the next time the vehicle
is driven.
A message displays to indicate that
EMM is active.
If EMM is required and the fuel level
is low, EMM may eventually empty
the fuel tank if fuel is not added. This

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
DRIVING AND OPERATING 229
will result in reduced, or no power. An
adequate fuel level must be
maintained in the vehicle to keep it
operational.
Fuel Maintenance Mode (FMM)
FMM tracks average fuel age. Old fuel
can cause engine problems. If low
engine usage causes average fuel age
to exceed approximately one year,
FMM will run the engine to use up
the old fuel. The engine will run until
enough fresh fuel is added to bring
the average fuel age into an
acceptable range. Allowing more old
fuel to be used up by FMM and
adding a larger amount of fresh fuel
will maximize the length of time
before another fuel maintenance
mode is needed. During FMM the
engine may turn on and off.
When FMM is needed, the FMM
Request screen appears on the
infotainment display at vehicle start.
If Yes is selected, FMM will begin. The
engine will not start until after a short
delay once shifted into D (Drive). FMM
will automatically continue at each
vehicle start until fresh fuel is added.
If No is selected, the FMM Request
screen will appear when the vehicle is
next started. The FMM request can be
delayed for only one day.If the FMM request was delayed for
one day, FMM will start at the next
vehicle start and display the FMM
Notification screen on the
infotainment display. The engine will
not start until after a short delay once
shifted into D (Drive).
If FMM is required and the fuel level
is low, FMM may eventually empty
the fuel tank if fuel is not added. This
will result in reduced, or no power. An
adequate fuel level must be
maintained in the vehicle to keep it
operational. After FMM has run it is
recommended to fill the fuel tank.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
232 DRIVING AND OPERATING
{Warning
Shifting into a drive gear while the
engine is running at high speed is
dangerous. Unless your foot is
firmly on the brake pedal, the
vehicle could move very rapidly.
You could lose control and hit
people or objects. Do not shift into
a drive gear while the engine is
running at high speed.
Caution
Shifting out of P (Park) or
N (Neutral) with the engine running
at high speed may damage the
transmission. The repairs would not
be covered by the vehicle warranty.
Be sure the engine is not running at
high speed when shifting the
vehicle.
Caution
A transmission hot message may
display if the automatic
transmission fluid is too hot.
Driving under this condition can
damage the vehicle. Stop and idle
the engine to cool the automatic
transmission fluid. This message
clears when the transmission fluid
has cooled sufficiently.
D : This position is for normal driving.
If more power is needed for passing,
press the accelerator pedal down.
Downshifting the transmission in
slippery road conditions could result
in skidding. See “Skidding”underLoss
of Control 0209.
M : This mode can be entered by
moving the shift lever from D (Drive)
to M (Manual Mode). M (Manual
Mode) allows the driver to select gears
appropriate for current driving
conditions. M (Manual Mode) can be
exited by returning the shift lever to
D (Drive). See Manual Mode (Gasoline
Only) 0233. For PLUG-IN vehicles, see
Regenerative
Braking (PLUG-IN Only) 0237.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.
While in Sport Mode, the vehicle
monitors driving behavior and
automatically enables performance
shift features when spirited driving is
detected. These features maintain
lower transmission gears to increase
available engine braking and improve
acceleration response. The vehicle will
exit these features and return to
normal operation after a short period
when no spirited driving is detected.
See Driver Mode Control (Gasoline Only)
0 241.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
DRIVING AND OPERATING 233
Manual Mode
(Gasoline Only)
For PLUG-IN vehicles, seeRegenerative
Braking (PLUG-IN Only) 0237.
Tap Shift
Caution
Driving with the engine at a high
rpm without upshifting while using
Tap Shift, could damage the vehicle.
Always upshift when necessary
while using Tap Shift.
If equipped, vehicles with Tap Shift
have controls on the back of the
steering wheel to manually shift the
automatic transmission.
To enter Permanent Tap Shift Mode: 1. Move the shift lever from D (Drive) to M (Manual Mode).
While in Tap Shift Mode, the M
on the PRNDM section of the
instrument cluster will become
highlighted, and the current gear
is indicated.
2. Tap the left control toward the driver to downshift, and the right
control toward the driver to
upshift. To shift to the lowest
available gear, press and hold the
left control.
3. To exit, move the shift lever back to D (Drive).
With the shift lever in D (Drive) and
not in Permanent Tap Shift Mode, the
Tap Shift controls will activate a
temporary tap manual shift mode,
allowing the transmission to be
manually shifted. The vehicle exits
Temporary Tap Shift Mode after the
accelerator pedal is steady for six seconds. Temporary Tap Shift
Mode holds a gear longer without
exiting when coasting, to provide
powertrain braking. The Temporary
Tap Shift Mode can also be
deactivated by holding the right
upshift control briefly.
While using Tap Shift, 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 downshift if the engine rpm is
too high in the next lower gear,
or upshift to the next higher gear
when the maximum engine rpm is
reached.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
238 DRIVING AND OPERATING
The braking system is computer
controlled and blends the regenerative
braking with the conventional
hydraulic disc brakes to meet any
requirements for deceleration. The
controller interprets the braking
request and uses regenerative braking,
conventional hydraulic braking, or a
combination of both as necessary.
Because the hydraulic braking system
uses an electronic booster for boost
assist on demand, under certain
conditions a motor noise may be
heard. This is normal operation.
SeeWarning Lights, Gauges, and
Indicators 0126 and Driver Information
Center (DIC) 0162. In the event of a
controller problem, the brake pedal
may be harder to push and the
stopping distance may be longer.
Regen on Demand
Regen on Demand allows the user to
select increased coast deceleration by
pressing the steering wheel tap
controls. It is activated temporarily
while in D (Drive) and permanently
while in M (Manual Mode). Increased
coast deceleration will be felt while the accelerator pedal is fully released
and lessened when the accelerator
pedal is pressed.
The brake pedal must be applied at
low speed, because Regen on Demand
will not stop the car.
The brake lamps may come on when
this feature is activated.
To enter Permanent Regen on
Demand Mode:
1. Move the shift lever from D (Drive) to M (Manual Mode).
While in Permanent Regen on
Demand, the M of the PRNDM
section of the instrument cluster
will become highlighted, and the
current coast deceleration level is
indicated. Level 1 (M1) provides
the most coast deceleration.
Level 4 (M4) provides the least
coast deceleration and is
equivalent to the level found in
D (Drive).
2. Tap the left control on the backof the steering wheel toward the
driver to select more coast
deceleration. Tap the right
control toward the driver to
select less coast deceleration. To
select the most coast
deceleration, press and hold the
left control.
3. To exit, move the shift lever back to D (Drive).
With the shift lever in D (Drive) and
not in Permanent Regen on Demand
Mode, the Tap Shift controls will
activate Temporary Regen on
Demand. The vehicle exits Temporary
Regen on Demand after the