2019 CADILLAC CT6 check engine

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
IN BRIEF 7
1.Air Vents 0187.
2. Exterior Lamp Controls 0166.
Turn Signal Lever. See Turn and
Lane-Change Signals 0170.
3. Tap Shift Controls (If Equipped). See Manual Mode 0215.
4. Instrument Cluster (Uplevel) 0130
or
Instrument Cluster (Base Level)
0 127.
Driver Information Center (DIC)
Display. See Driver Information
Center (DIC) 0150.
5. Windshield Wiper/Washer 0120.
6. ENGINE START/STOP Button. See Ignition Positions 0201.
7. Park Assist Button. See Assistance Systems for Parking or
Backing 0253.
Automatic Parking Assist (APA)
Button (If Equipped). See
Assistance Systems for Parking or
Backing 0253.
Automatic Engine Stop/Start
Disable Switch (If Equipped). See
Stop/Start System 0203. 8. Light Sensor. See
Automatic
Headlamp System 0169.
9. Hazard Warning Flashers 0169.
Glove Box Button. See Glove Box
0 114.
10. Infotainment 0174.
11. Heated and Ventilated Front Seats
070 (If Equipped).
12. Wireless Charging 0123.
13. Automatic Climate Control System
(Dual Zone) 0175 or
Automatic Climate Control System
(Quad Zone) 0180.
14. Automatic Vehicle Hold (AVH)
0220 (If Equipped).
MODE Button. See Driver Mode
Control 0222.
Traction Control/Electronic
Stability Control 0220.
15. Infotainment Control Knob. See the infotainment manual.
16. Shift Lever. See Automatic
Transmission 0210. 17. Driver Information Center (DIC)
Controls. See Driver Information
Center (DIC) 0150.
18. Steering Wheel Controls. See the infotainment manual.
19. Horn 0120.
20. Steering Wheel Adjustment 0119
(Out of View).
21. Forward Collision Alert (FCA)
System 0262 (If Equipped).
Lane Keep Assist (LKA) 0273 (If
Equipped).
Heated Steering Wheel 0119 (If
Equipped).
22. Cruise Control 0227.
Adaptive Cruise Control 0229 (If
Equipped).
Super Cruise 0237 (If Equipped).
Phone Button. See “Steering
Wheel Controls ”in the
infotainment manual.
23. Data Link Connector (DLC) (Out of View). See Malfunction
Indicator Lamp (Check Engine
Light) 0139.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
36 KEYS, DOORS, AND WINDOWS
2. Separate the two halves of thetransmitter using a flat tool
inserted into the bottom center
of the transmitter. Do not use
the key slot.3. Remove the old battery. Do notuse a metal object.
4. Insert the new battery on the back housing, positive side facing
down. Replace with a CR2032 or
equivalent battery.
5. Align the front and back housing, then snap the transmitter
together.
6. Reinsert the key.
Remote Vehicle Start
This feature allows the engine to be
started from outside the vehicle.
/: This button is on the RKE
transmitter for remote start.
The climate control system will use
the previous settings during a remote
start. The rear window defogger may
come on during remote start based on
cold ambient conditions. The rear
defog indicator light does not come on
during remote start.
If equipped, the heated steering wheel
may come on during cold weather
when enabled in vehicle
personalization. See Vehicle
Personalization 0157.
If equipped, the heated and ventilated
front seats may also come on when
the vehicle personalization setting is
enabled. See Heated and Ventilated
Front Seats 070.
Laws in some local communities may
restrict the use of remote starters. For
example, some laws may require a
person using remote start to have the
vehicle in view. Check local
regulations for any requirements.
If your vehicle is low on fuel, do not
use the remote start feature. The
vehicle may run out of fuel.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
118 INSTRUMENTS AND CONTROLS
Instruments and
Controls
Controls
Steering Wheel Adjustment . . . . . 119
Steering Wheel Controls . . . . . . . . . 119
Heated Steering Wheel . . . . . . . . . . 119
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Windshield Wiper/Washer . . . . . . . 120
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Power Outlets . . . . . . . . . . . . . . . . . . . . . 122
Wireless Charging . . . . . . . . . . . . . . . . 123
Cigarette Lighter . . . . . . . . . . . . . . . . . . 125
Ashtrays . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Warning Lights, Gauges, and
Indicators
Warning Lights, Gauges, andIndicators . . . . . . . . . . . . . . . . . . . . . . . 126
Instrument Cluster (Base
Level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Instrument Cluster (Uplevel) . . . . 130
Speedometer . . . . . . . . . . . . . . . . . . . . . . 133
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . 133
Trip Odometer . . . . . . . . . . . . . . . . . . . . 133
Tachometer . . . . . . . . . . . . . . . . . . . . . . . 133
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . . . . 133 Engine Oil Pressure Gauge (Base
Level Cluster Only) . . . . . . . . . . . . . 134
Engine Coolant Temperature Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Voltmeter Gauge (Base Level
Cluster Only) . . . . . . . . . . . . . . . . . . . . 136
Seat Belt Reminders . . . . . . . . . . . . . . 137
Airbag Readiness Light . . . . . . . . . . 138
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . 138
Charging System Light . . . . . . . . . . . 139
Malfunction Indicator Lamp (Check Engine Light) . . . . . . . . . . . 139
Brake System Warning Light (3.0L Twin Turbo and 3.6L
V6 Engines) . . . . . . . . . . . . . . . . . . . . . 141
Brake System Warning Light (2.0L L4 Turbo and 4.2L Twin
Turbo V8 Engines) . . . . . . . . . . . . . . 142
Electric Parking Brake Light . . . . . 143
Service Electric Parking Brake Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Antilock Brake System (ABS) Warning Light . . . . . . . . . . . . . . . . . . 143
Gear Shifting Light . . . . . . . . . . . . . . . 144
Automatic Vehicle Hold (AVH) Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Lane Keep Assist (LKA) Light . . . 144
Vehicle Ahead Indicator . . . . . . . . . 144
Pedestrian Ahead Indicator . . . . . . 145 Traction Off Light . . . . . . . . . . . . . . . . 145
StabiliTrak OFF Light . . . . . . . . . . . . 145
Traction Control System (TCS)/
StabiliTrak Light . . . . . . . . . . . . . . . . 146
Engine Coolant Temperature
Warning Light . . . . . . . . . . . . . . . . . . 146
Driver Mode Control Light . . . . . . . 146
Tire Pressure Light . . . . . . . . . . . . . . . 147
Engine Oil Pressure Light . . . . . . . . 147
Low Fuel Warning Light . . . . . . . . . 148
Security Light . . . . . . . . . . . . . . . . . . . . . 148
High-Beam On Light . . . . . . . . . . . . . 148
Lamps On Reminder . . . . . . . . . . . . . 149
Cruise Control Light . . . . . . . . . . . . . . 149
Door Ajar Light . . . . . . . . . . . . . . . . . . . 149
Information Displays
Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . . . . 150
Head-Up Display (HUD) . . . . . . . . . 152
Vehicle Messages
Vehicle Messages . . . . . . . . . . . . . . . . . 156
Engine Power Messages . . . . . . . . . . 156
Vehicle Speed Messages . . . . . . . . . 156
Vehicle Personalization
Vehicle Personalization . . . . . . . . . . 157
Universal Remote System
Universal Remote System . . . . . . . . 162

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
126 INSTRUMENTS AND CONTROLS
Warning Lights, Gauges,
and Indicators
Warning lights and gauges can signal
that something is wrong before it
becomes serious enough to cause an
expensive repair or replacement.
Paying attention to the warning lights
and gauges could prevent injury.Some warning lights come on briefly
when the engine is started to indicate
they are working. When one of the
warning lights comes on and stays on
while driving, or when one of the
gauges shows there may be a problem,
check the section that explains what
to do. Waiting to do repairs can be
costly and even dangerous.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
INSTRUMENTS AND CONTROLS 135
English, Standard Theme Shown
The engine oil pressure gauge shows
the engine oil pressure
in kPa (kilopascals) when the engine is
running.
Oil pressure can vary with engine
speed, outside temperature and oil
viscosity.
On some models, the oil pump will
vary engine oil pressure according to
engine needs. Oil pressure may change
quickly as the engine speed or load
varies. This is normal.
If the oil pressure warning light or
Driver Information Center (DIC)
message indicates oil pressure outside the normal operating range, check the
vehicle's oil as soon as possible. See
Engine Oil
0299.
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
vehicle serviced. Always follow the
maintenance schedule for changing
engine oil.
Engine Coolant
Temperature Gauge
Base Level Metric Standard Theme

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
INSTRUMENTS AND CONTROLS 139
If the word ON or the on symbol is lit
on the passenger airbag status
indicator, it means that the front
outboard passenger frontal airbag and
knee airbag are allowed to inflate.
If the word OFF or the off symbol is lit
on the airbag status indicator, it
means that the passenger sensing
system has turned off the front
outboard passenger frontal airbag and
knee airbag.
If, after several seconds, both status
indicator lights remain on, or if there
are no lights at all, there may be a
problem with the lights or the
passenger sensing system. See your
dealer for service.
{Warning
If the airbag readiness light ever
comes on and stays on, it means
that something may be wrong with
the airbag system. To help avoid
injury to yourself or others, have
the vehicle serviced right away. See(Continued)
Warning (Continued)
Airbag Readiness Light0138 for
more information, including
important safety information.
Charging System Light
On some vehicles the charging system
light comes on briefly when the
ignition is turned on, but the engine is
not running, as a check to show the
light is working. It should go out when
the engine is started. For vehicles with
a reconfigurable cluster, this light may
not come on when the ignition is
turned on.
If the light stays on, or comes on
while driving, there may be a problem
with the electrical charging system. Have it checked by your dealer.
Driving while this light is on could
drain the battery.
When this light comes on, or is
flashing, the Driver Information
Center (DIC) also displays a message.
If a short distance must be driven
with the light on, be sure to turn off
all accessories, such as the radio and
air conditioner.
Malfunction Indicator Lamp
(Check Engine Light)
This light is part of the vehicle’s
emission control on-board diagnostic
system. If this light is on while the
engine is running, a malfunction has
been detected and the vehicle may
require service. The light should come
on to show that it is working when
the ignition is in Service Mode. See
Ignition Positions
0201.

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
140 INSTRUMENTS AND CONTROLS
Malfunctions are often indicated by
the system before any problem is
noticeable. Being aware of the light
and seeking service promptly when it
comes on may prevent damage.
Caution
If the vehicle is driven continually
with this light on, the emission
control system may not work as
well, the fuel economy may be
lower, and the vehicle may not run
smoothly. This could lead to costly
repairs that might not be covered
by the vehicle warranty.
Caution
Modifications to the engine,
transmission, exhaust, intake,
or fuel system, or the use of
replacement tires that do not meet
the original tire specifications, can
cause this light to come on. This
could lead to costly repairs not
covered by the vehicle warranty.
This could also affect the vehicle’s
ability to pass an Emissions
Inspection/Maintenance test. See
Accessories and Modifications0290.
If the light is f lashing : A
malfunction has been detected that
could damage the emission control
system and increase vehicle
emissions. Diagnosis and service may
be required.
To help prevent damage, reduce
vehicle speed and avoid hard
accelerations and uphill grades.
If towing a trailer, reduce the amount
of cargo being hauled as soon as
possible. 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 0278. 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

Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-12533370) -
2019 - crc - 1/23/19
146 INSTRUMENTS AND CONTROLS
Traction Control System
(TCS)/StabiliTrak Light
This light comes on briefly when the
engine is started.
If the light does not come on, have
the vehicle serviced by your dealer.
If the system is working normally, the
indicator light turns off.
If the light is on and not flashing, the
TCS and potentially the StabiliTrak/
ESC system have been disabled.
A Driver Information Center (DIC)
message may display. Check the DIC
messages to determine which
feature(s) is no longer functioning and
whether the vehicle requires service.
If the light is on and flashing, the TCS
and/or the StabiliTrak/ESC system is
actively working.See
Traction Control/Electronic Stability
Control 0220.
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
(Continued)
Caution (Continued)
and it may not be covered by the
vehicle warranty. SeeEngine
Overheating 0312.
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 0312.
Driver Mode Control Light
This light comes on when Sport Mode
is selected.