2018 CADILLAC CT6 maintenance

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
144 INSTRUMENTS AND CONTROLS
If the light continues to flash, find a
safe place to park. Turn the vehicle off
and wait at least 10 seconds before
restarting the engine. If the light is
still flashing, follow the previous
guidelines and see your dealer for
service as soon as possible.
If the light is on steady :A
malfunction has been detected.
Diagnosis and service may be
required.
Check the following:
. If fuel has been added to the
vehicle using the capless fuel
funnel adapter, make sure that it
has been removed. See “Filling the
Tank with a Portable Gas Can ”
under Filling the Tank 0288. The
diagnostic system can detect if the
adapter has been left installed in
the vehicle, allowing fuel to
evaporate into the atmosphere.
A few driving trips with the
adapter removed may turn off the
light.
. Poor fuel quality can cause
inefficient engine operation and
poor driveability, which may go
away once the engine is warmed up. If this occurs, change the fuel
brand. It may require at least one
full tank of the proper fuel to turn
the light off. See
Fuel0286.
If the light remains on, see your
dealer.
Emissions Inspection and
Maintenance Programs
If the vehicle requires an Emissions
Inspection/Maintenance test, the test
equipment will likely connect to the
vehicle's Data Link Connector (DLC).
The DLC is under the instrument
panel to the left of the steering wheel.
Connecting devices that are not used
to perform an Emissions Inspection/
Maintenance test or to service the
vehicle may affect vehicle operation.
See Add-On Electrical Equipment 0295.
See your dealer if assistance is needed. The vehicle may not pass
inspection if:
.
The light is on when the engine is
running.
. The light does not come on when
the ignition is in Service Mode.
. Critical emission control systems
have not been completely
diagnosed. If this happens, the
vehicle would not be ready for
inspection and might require
several days of routine driving
before the system is ready for
inspection. This can happen if the
12-volt battery has recently been
replaced or run down, or if the
vehicle has been recently serviced.
See your dealer if the vehicle will not
pass or cannot be made ready for
the test.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
INSTRUMENTS AND CONTROLS 149
Engine Coolant
Temperature Warning Light
On some vehicles this light comes on
briefly while starting the vehicle. If it
does not, have the vehicle serviced by
the dealer. If the system is working
normally the indicator light goes off.
For vehicles with the reconfigurable
cluster, this light may not come on
when starting the vehicle.
Caution
The engine coolant temperature
warning light indicates that the
vehicle has overheated. Driving with
this light on can damage the engine
and it may not be covered by the
vehicle warranty. SeeEngine
Overheating 0321. The engine coolant temperature
warning light comes on when the
engine has overheated.
If this happens pull over and turn off
the engine as soon as possible. See
Engine Overheating
0321.
Tire Pressure Light
For vehicles with the Tire Pressure
Monitor System (TPMS), this light
comes on briefly when the engine is
started. It provides information about
tire pressures and the TPMS.
When the Light Is On Steady
This indicates that one or more of the
tires are significantly underinflated.
A Driver Information Center (DIC) tire
pressure message may also display.
Stop as soon as possible, and inflate the tires to the pressure value shown
on the Tire and Loading Information
label. See
Tire Pressure 0347.
When the Light Flashes First and
Then Is On Steady
If the light flashes for about a minute
and then stays on, there may be a
problem with the TPMS. If the
problem is not corrected, the light will
come on at every ignition cycle. See
Tire Pressure Monitor Operation 0350.
Engine Oil Pressure Light
Caution
Lack of proper engine oil
maintenance can damage the
engine. Driving with the engine oil
low can also damage the engine.
The repairs would not be covered
by the vehicle warranty. Check the
oil level as soon as possible. Add oil
if required, but if the oil level is
within the operating range and the
oil pressure is still low, have the
(Continued)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
150 INSTRUMENTS AND CONTROLS
Caution (Continued)
vehicle serviced. Always follow the
maintenance schedule for changing
engine oil.
This light should come on briefly as
the engine is started. If it does not
come on, have the vehicle serviced by
your dealer.
If the light comes on and stays on, it
means that oil is not flowing through
the engine properly. The vehicle could
be low on oil and might have some
other system problem. See your dealer.
Low Fuel Warning Light
This light is near the fuel gauge and
comes on briefly when the ignition is
turned on as a check to show it is
working. For vehicles with a
reconfigurable cluster, this light is in
the display area and may not come on
when the ignition is turned on.
It also comes on when the fuel tank is
low on fuel. The light turns off when
fuel is added. If it does not, have the
vehicle serviced.
Auto Stop Mode (Uplevel
Cluster)
This light comes on when the engine
is in an Auto Stop.
SeeStarting the Engine (PLUG-IN Only)
0 218 orStarting the Engine (Gasoline
Only) 0221.
Security Light
On some vehicles the immobilizer
light should come on briefly as the
engine is started. If it does not come
on, have the vehicle serviced by your
dealer. If the system is working
normally, the indicator light turns off.
For vehicles with the reconfigurable
cluster, this light may not come on
when the engine is started.
If the light stays on and the engine
does not start, there could be a
problem with the theft-deterrent
system. See Immobilizer Operation
0 53.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
INSTRUMENTS AND CONTROLS 165
Oil Life :Shows an estimate of the
oil's remaining useful life.
If REMAINING OIL LIFE 99% is
displayed, that means 99% of the
current oil life remains.
When the remaining oil life is low, the
CHANGE ENGINE OIL SOON message
will appear on the display. The oil
should be changed as soon as
possible. See Engine Oil0307. In
addition to the engine oil life system
monitoring the oil life, additional
maintenance is recommended. See
Maintenance Schedule 0390.
The Oil Life display must be reset
after each oil change. It will not reset
itself. Do not reset the Oil Life display
accidentally at any time other than
when the oil has just been changed.
It cannot be reset accurately until the
next oil change. To reset the engine
oil life system, press and hold SEL for
several seconds while the Oil Life
display is active. See Engine Oil Life
System 0309.
Tire Pressure : Shows the
approximate pressures of all four tires.
Tire pressure is displayed in either
kilopascal (kPa) or in pounds per square inch (psi). If the pressure is
low, the value for that tire is shown in
amber.
See
Tire Pressure Monitor System 0349
and Tire Pressure Monitor Operation
0 350.
Vehicle Odometer (Base Cluster) :
Shows the odometer.
Blank Page : Allows for no
information to be displayed in the
cluster info display areas.
Head-Up Display (HUD)
{Warning
If the HUD image is too bright or
too high in your field of view, it
may take you more time to see
things you need to see when it is
dark outside. Be sure to keep the
HUD image dim and placed low in
your field of view.
If equipped with HUD, some
information concerning the operation
of the vehicle is projected onto the
windshield. The image is projected
through the HUD lens on top of the instrument panel. The information
appears as an image focused out
toward the front of the vehicle.
Caution
If you try to use the HUD image as
a parking aid, you may misjudge
the distance and damage your
vehicle. Do not use the HUD image
as a parking aid.
The HUD information can be
displayed in various languages in
some vehicles. The speedometer
reading and other numerical values
can be displayed in either English or
metric units.
The language selection is changed
through the radio and the units of
measurement is changed through the
instrument cluster. See Vehicle
Personalization 0170 and “Cluster
Options Menu ”under Instrument
Cluster (Base Level) 0127 or
Instrument Cluster (Uplevel) 0130.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
CLIMATE CONTROLS 191
Climate Controls
Climate Control Systems
Automatic Climate ControlSystem (Dual Zone - Gasoline
and PLUG-IN) . . . . . . . . . . . . . . . . . . . 191
Automatic Climate Control System (Quad Zone -
Gasoline Only) . . . . . . . . . . . . . . . . . . 197
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Maintenance
Passenger Compartment AirFilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Climate Control Systems
Automatic Climate Control System (Dual Zone - Gasoline
and PLUG-IN)
The climate control buttons on the center stack and on the climate control
display are used to adjust the heating, cooling, and ventilation.
Center Stack Climate Controls
1. Driver and Passenger Temperature Controls
2. Fan Control
3. Driver and Passenger Heated and Ventilated Seats (If Equipped)
4. Rear Window Defogger 5. Defrost
6. OFF (Fan)
7. Recirculation
8. AUTO (Automatic Operation)

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
204 CLIMATE CONTROLS
.Clear snow off the hood to
improve visibility and help
decrease moisture drawn into the
vehicle.
. Keep the path under the front
seats clear of objects to help
circulate the air inside of the
vehicle more effectively.
. Use of non-GM approved hood
deflectors can adversely affect the
performance of the system. Check
with your dealer before adding
equipment to the outside of the
vehicle.
. Do not attach any devices to the
air vent slats. This restricts airflow
and may cause damage to the air
vents.Maintenance
Passenger Compartment
Air Filter
The filter reduces dust, pollen, and
other airborne irritants from outside
air that is pulled into the vehicle. The
filter should be replaced as part of
routine scheduled maintenance. See
Maintenance Schedule 0390.
See your dealer regarding replacement
of the filter.
Service
All vehicles have a label underhood
that identifies the refrigerant used in
the vehicle. The refrigerant system
should only be serviced by trained and
certified technicians. The air
conditioning evaporator should never
be repaired or replaced by one from a
salvage vehicle. It should only be
replaced by a new evaporator to
ensure proper and safe operation.
During service, all refrigerants should
be reclaimed with proper equipment.
Venting refrigerants directly to the
atmosphere is harmful to the
environment and may also create
unsafe conditions based on inhalation,
combustion, frostbite, or other
health-based concerns.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
DRIVING AND OPERATING 205
Driving and
Operating
Driving Information
Distracted Driving . . . . . . . . . . . . . . . . 206
Defensive Driving . . . . . . . . . . . . . . . . 207
Drunk Driving . . . . . . . . . . . . . . . . . . . . 207
Control of a Vehicle . . . . . . . . . . . . . . 207
Braking (Gasoline Only) . . . . . . . . . . 207
Braking (PLUG-IN Only) . . . . . . . . . 208
Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Off-Road Recovery . . . . . . . . . . . . . . . . 209
Loss of Control . . . . . . . . . . . . . . . . . . . 209
Driving on Wet Roads . . . . . . . . . . . 210
Hill and Mountain Roads . . . . . . . . 211
Winter Driving . . . . . . . . . . . . . . . . . . . . 211
If the Vehicle Is Stuck . . . . . . . . . . . 212
Vehicle Load Limits . . . . . . . . . . . . . . 213
Starting and Operating
New Vehicle Break-In (GasolineEngine Only) . . . . . . . . . . . . . . . . . . . . 216
Ignition Positions . . . . . . . . . . . . . . . . 217
Starting the Engine (PLUG-IN Only) . . . . . . . . . . . . . . . . . 218
Starting the Engine (Gasoline Only) . . . . . . . . . . . . . . . . . 221
Engine Heater . . . . . . . . . . . . . . . . . . . . 223 Retained Accessory
Power (RAP) . . . . . . . . . . . . . . . . . . . . 224
Shifting Into Park . . . . . . . . . . . . . . . . 224
Shifting out of Park . . . . . . . . . . . . . . 225
Parking over Things That Burn . . . . . . . . . . . . . . . . . . . . . . . 225
Extended Parking . . . . . . . . . . . . . . . . . 226
Electric Vehicle Operating
Modes
Driver Selected Operating Modes (PLUG-IN Only) . . . . . . . . . . . . . . . . . 226
Out of Fuel/Engine Unavailable . . . . . . . . . . . . . . . . . . . . . . 227
Maintenance Modes . . . . . . . . . . . . . . 228
Engine Exhaust
Engine Exhaust . . . . . . . . . . . . . . . . . . . 230
Running the Vehicle While Parked . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Automatic Transmission
Automatic Transmission . . . . . . . . . 231
Manual Mode (Gasoline Only) . . . 233
Drive Systems
All-Wheel Drive . . . . . . . . . . . . . . . . . . 234
Brakes
Antilock Brake System (ABS) . . . . 234
Electric Parking Brake . . . . . . . . . . . . 235
Brake Assist . . . . . . . . . . . . . . . . . . . . . . . 236 Hill Start Assist (HSA) . . . . . . . . . . . 237
Automatic Vehicle
Hold (AVH) . . . . . . . . . . . . . . . . . . . . . 237
Regenerative Braking (PLUG-IN Only) . . . . . . . . . . . . . . . . . 237
Ride Control Systems
Traction Control/Electronic
Stability Control . . . . . . . . . . . . . . . . 239
Driver Mode Control (Gasoline Only) . . . . . . . . . . . . . . . . . 241
Cruise Control
Cruise Control . . . . . . . . . . . . . . . . . . . . 242
Adaptive Cruise Control . . . . . . . . . 245
Driver Assistance Systems
Driver Assistance Systems . . . . . . . 253
Assistance Systems for Parkingor Backing . . . . . . . . . . . . . . . . . . . . . . . 254
Assistance Systems for Driving . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . . . . . . 260
Forward Automatic Braking (FAB) . . . . . . . . . . . . . . . . . . . 262
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Night Vision System . . . . . . . . . . . . . 266
Side Blind Zone Alert (SBZA) . . . . 268
Lane Change Alert (LCA) . . . . . . . . 269

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-11292458) -
2018 - crc - 2/14/17
208 DRIVING AND OPERATING
Average driver reaction time is about
three-quarters of a second. In that
time, a vehicle moving at 100 km/h
(60 mph) travels 20 m (66 ft), which
could be a lot of distance in an
emergency.
Helpful braking tips to keep in mind
include:
.Keep enough distance between
you and the vehicle in front
of you.
. Avoid needless heavy braking.
. Keep pace with traffic.
If the engine ever stops while the
vehicle is being driven, brake normally
but do not pump the brakes. Doing so
could make the pedal harder to push
down. If the engine stops, there will
be some power brake assist but it will
be used when the brake is applied.
Once the power assist is used up, it
can take longer to stop and the brake
pedal will be harder to push.Braking (PLUG-IN Only)
Braking action involves perception
time and reaction time. Deciding to
push the brake pedal is perception
time. Actually doing it is
reaction time.
Average driver reaction time is about
three-quarters of a second. In that
time, a vehicle moving at 100 km/h
(60 mph) travels 20 m (66 ft), which
could be a lot of distance in an
emergency.
Helpful braking tips to keep in mind
include:
. Keep enough distance between
you and the vehicle in front
of you.
. Avoid needless heavy braking.
. Keep pace with traffic.
The brake system is not affected by
whether or not the engine is running.
If there is a brake controller fault, the
brakes may lose power assist. More
effort will be required to stop the
vehicle.
Steering
Variable Effort Steering
The vehicle has a steering system that
varies the amount of effort required to
steer the vehicle in relation to the
speed of the vehicle.
The amount of steering effort required
is less at slower speeds to make the
vehicle more maneuverable and easier
to park. At faster speeds, the steering
effort increases to provide a sport-like
feel to the steering. This provides
maximum control and stability.
Electric Power Steering
The vehicle has electric power
steering. It does not have power
steering fluid. Regular maintenance is
not required.
If power steering assist is lost due to a
system malfunction, the vehicle can
be steered, but may require increased
effort. See your dealer if there is a
problem.