2023 CADILLAC CT4 service

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
OnStar 503
OnStar Personal
Identification
Number (PIN)
A PIN is needed to access
some OnStar services. The
PIN will need to be changed
the first time when speaking
with an Advisor. To change the
OnStar PIN, contact an
OnStar Advisor by pressing
Q
or calling 1-888-4ONSTAR.
Warranty
OnStar equipment may be
warranted as part of the
vehicle warranty.
Languages
The vehicle can be
programmed to respond in
multiple languages. Press
Q
and ask for an Advisor.
Advisors are available in
English, Spanish, and French.
Available languages may vary
by country.
Potential Issues
OnStar cannot perform
Remote Door Unlock or Stolen
Vehicle Assistance after the
vehicle has been off
continuously for an extended
period of time without an
ignition cycle. To find out the
duration of time that applies
for the vehicle, contact an
OnStar Advisor by pressing
Q
or calling 1-888-4ONSTAR.
If the vehicle has not been
started for an extended period
of time, OnStar can contact
Roadside Assistance or a
locksmith to help gain access
to the vehicle.
Global Positioning
System (GPS)
.Obstruction of the GPS can
occur in a large city with tall
buildings; in parking garages;
around airports; in tunnels
and underpasses; or in an
area with very dense trees.
If GPS signals are not
available, the OnStar system
should still operate to callOnStar. However, OnStar
could have difficulty
identifying the exact
location.
.In emergency situations,
OnStar can use the last
stored GPS location to send
to emergency responders.
A temporary loss of GPS can
cause loss of the ability to
send a Turn-by-Turn
Navigation route. The Advisor
may give a verbal route or may
ask for a call back after the
vehicle is driven into an
open area.
Cellular and GPS
Antennas
Cellular reception is required
for OnStar to send remote
signals to the vehicle. Do not
place items over or near the
antenna to prevent blocking
cellular and GPS signal
reception.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
504 OnStar
Unable to Connect to
OnStar Message
If there is limited cellular
coverage or the cellular
network has reached
maximum capacity, this
message may come on. Press
Qto try the call again or try
again after driving a few miles
into another cellular area.
Vehicle and Power Issues
OnStar services require a
vehicle electrical system,
wireless service, and GPS
satellite technologies to be
available and operating for
features to function properly.
These systems may not
operate if the battery is
discharged or disconnected.
Add-on Electrical
Equipment
The OnStar system is
integrated into the electrical
architecture of the vehicle. Do
not add any electrical equipment. See Add-On
Electrical Equipment
0366.
Added electrical equipment
may interfere with the
operation of the OnStar
system and cause it to not
operate.
Vehicle Software Updates
OnStar or GM may remotely
deliver software updates or
changes to the vehicle without
further notice or consent.
These updates or changes
may enhance or maintain
safety, security, or the
operation of the vehicle or the
vehicle systems. Software
updates or changes may
affect or erase data or
settings that are stored in the
vehicle, such as saved
navigation destinations or
pre-set radio stations. Neither
OnStar nor GM is responsible
for any affected or erased
data or settings. These
updates or changes may also
collect personal information.
Such collection is described in the OnStar privacy statement
or separately disclosed at the
time of installation. These
updates or changes may also
cause a system to
automatically communicate
with GM servers to collect
information about vehicle
system status, identify
whether updates or changes
are available, or deliver
updates or changes. An active
OnStar agreement constitutes
consent to these software
updates or changes and
agreement that either OnStar
or GM may remotely deliver
them to the vehicle.
Privacy
The complete OnStar Privacy
Statement may be found at
www.onstar.com (U.S.),
or www.onstar.ca (Canada).
We recommend that you
review it. If you have any
questions, call
1-888-4ONSTAR
(1-888-466-7827) or press
Q
to speak with an Advisor.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
506 Connected Services
Connected
Services
Connected Services
Navigation . . . . . . . . . . . . . . . . . . . 506
Connections . . . . . . . . . . . . . . . . 507
Diagnostics . . . . . . . . . . . . . . . . . 508
Connected
Services
Navigation
Navigation requires a specific
OnStar or connected
service plan.
Press
Qto receive
Turn-by-Turn directions or
have them sent to the
vehicle’s navigation screen,
if equipped. Select
Turn-by-Turn Directions from
the Services tab of the OnStar
app to call an Advisor or select
a recent or favorite
destination. Touch the
navigation icons to select
home, address, or place.
A destination transfer from
OnStar will show the detail
view of the destination when it
is transferred from OnStar to
the Navigation application. See
www.onstar.com for a
coverage map. Services vary by model. Map coverage is
available in the United States
and Canada.
Turn-by-Turn Navigation
1. PressQto connect to an
Advisor.
2. Request directions to be downloaded to the vehicle.
3. Follow the voice-guided commands.
Using Voice Commands
During a Planned Route
Functionality of the Voice
Command button, if equipped,
may vary by vehicle and
region. For some vehicles,
press
=to open the OnStar
app on the infotainment
display.
Send Destination to Vehicle
Directions can be sent to the
vehicle’s navigation screen,
if equipped.
Press
Q, then ask the Advisor
to download directions to the
vehicle’s navigation system,

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Connected Services 507
if equipped. After the call
ends, the navigation screen
will provide prompts to begin
driving directions. Routes that
are sent to the navigation
screen can only be canceled
through the navigation
system.
See www.onstar.com (U.S.) or
www.onstar.ca (Canada).
Connections
The following services help
with staying connected.
For coverage maps, see
www.onstar.com (U.S.) or
www.onstar.ca (Canada).
Ensuring Security
.Change the default
passwords for the Wi-Fi
hotspot and myCadillac
mobile app. Make these
passwords different from
each other and use a
combination of letters and
numbers to increase the
security.
.Change the default name of
the SSID (Service Set
Identifier). This is the
network name that is visible
to other wireless devices.
Choose a unique name and
avoid family names or vehicle
descriptions.
Wi-Fi Hotspot (If Equipped)
The vehicle may have a built-in
Wi-Fi hotspot that provides
access to the Internet and
web content at 4G LTE speed.
Up to seven mobile devices
can be connected. A data plan
is required. Use the in-vehicle
controls only when it is safe to
do so. 1. To retrieve Wi-Fi hotspot information, press
=to
open the OnStar app on
the infotainment display,
then select Wi-Fi Hotspot.
On some vehicles, touch
Wi-Fi or Wi-Fi Settings on
the screen.
2. The Wi-Fi settings will display the Wi-Fi hotspot
name (SSID), password, and on some vehicles, the
connection type (no
Internet connection, 3G,
4G, 4G LTE), and signal
quality (poor, good,
excellent). The LTE icon
shows connection to Wi-Fi.
It is possible that the icon
may not illuminate even
though the vehicle has an
active connection.
3. To change the SSID or password, press
Qor call
1-888-4ONSTAR to
connect with an Advisor.
On some vehicles, the SSID
and password can be
changed in the Wi-Fi
Hotspot menu.
After initial set-up, your
vehicle’s Wi-Fi hotspot will
connect automatically to your
mobile devices. Manage data
usage by turning Wi-Fi on or
off on your mobile device, by
using the myCadillac mobile
app, or by contacting an
OnStar Advisor. On some

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
508 Connected Services
vehicles, Wi-Fi can also be
managed from the Wi-Fi
Hotspot menu.
MyCadillac Mobile App (If
Available)
Download the myCadillac
mobile app to compatible
Apple and Android
smartphones. Cadillac users
can access the following
services from a smartphone:
.Remotely start/stop the
vehicle, if factory-equipped.
.Lock/unlock doors,
if equipped with automatic
locks.
.Activate the horn and lamps.
.Check the vehicle fuel level,
oil life, or tire pressure,
if factory-equipped with the
Tire Pressure Monitor
System.
.Send destinations to the
vehicle.
.Locate the vehicle on a map
(U.S. market only).
.Turn the vehicle's Wi-Fi
hotspot on/off, manage
settings, and monitor data
consumption, if equipped.
.Locate a dealer and
schedule service.
.Request Roadside
Assistance.
.Set a parking reminder with
pin drop, take a photo, make
a note, and set a timer.
.Connect with Cadillac on
social media.
Features are subject to
change. For myCadillac mobile
app information and
compatibility, see
my.cadillac.com.
An active OnStar or
connected service plan may be
required. A compatible device,
factory-installed remote start,
and power locks are required.
Data rates apply. See
www.onstar.com for details
and system limitations.
Remote Services
Contact an OnStar Advisor to
unlock the doors or sound the
horn and flash the lamps.
Marketplace
OnStar Advisors can provide
offers from restaurants and
retailers on your route, help
locate hotels, or book a room.
These services vary by
market.
Diagnostics
By monitoring and reporting
on the vehicle’s key systems,
OnStar Advanced Diagnostics,
if equipped, provides a way to
keep up on maintenance.
Capabilities vary by model. See
www.onstar.com for details
and system limitations.
Features are subject to
change. For updates on
feature capabilities, see
my.cadillac.com. Message and
data rates may apply.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
INDEX 511
Bulb Replacement (cont'd)High Intensity
Discharge (HID)
Lighting . . . . . . . . . . . . . . . . . . . . . 403
Buying New Tires . . . . . . . . . . . . 432
C
Calibration Compass . . . . . . . . . . . . . . . . . . . . . . 101
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . 370
California Proposition 65 Warning . . . . . . . . . . . . . . . . 1, 447
Camera Rear Vision (RVC) . . . . . . . . . 335
Canadian Vehicle Owners . . . . 2
Capacities and
Specifications . . . . . . . . . . . . . . . 480
Carbon Monoxide Engine Exhaust . . . . . . . . . . . . . 271
Trunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Winter Driving . . . . . . . . . . . . . . 253
Cargo Management System . . . . . . 96
Tie-Downs . . . . . . . . . . . . . . . . . . . . . 96
Caution, Danger, and Warning . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Center Console
Storage . . . . . . . . . . . . . . . . . . . . . . . . 95
Chains, Tire . . . . . . . . . . . . . . . . . . . 437
Charging System Light . . . . . . . . . . . . . . . . . 117
Wireless . . . . . . . . . . . . . . . . . . . . . . . 102
Check Engine Light
(Malfunction Indicator) . . . . .118
Child Restraints Infants and YoungChildren . . . . . . . . . . . . . . . . . . . . . . . 74
Lower Anchors and Tethers for Children . . . . . . 80
Older Children . . . . . . . . . . . . . . . . 72
Securing . . . . . . . . . . . . . . . . . . 88, 90
Systems . . . . . . . . . . . . . . . . . . . . . . . . 77
Child Safety Locks . . . . . . . . . . . . 22
Circuit Breakers . . . . . . . . . . . . . 406
Cleaning Exterior Care . . . . . . . . . . . . . . . 455
Interior Care . . . . . . . . . . . . . . . . . 461
Climate Control Systems Dual Automatic . . . . . . . . . . . . . 225
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Cluster, Instrument . . . 106, 108
Clutch, Hydraulic . . . . . . . . . . . . 383
Collision Damage Repair . . . 491 Compartments
Storage . . . . . . . . . . . . . . . . . . . . . . . . 94
Compass . . . . . . . . . . . . . . . . . . . . . . . . 101
Competitive Driving Mode . . . . . . . . . . . . . . . . 298
Composite Materials . . . . . . . 260
Compressor Kit, Tire Sealant . . . . . . . . . . . . . . . . . . . . . . . . 439
Connected Services Connections . . . . . . . . . . . . . . . . 507
Diagnostics . . . . . . . . . . . . . . . . . . 508
Navigation . . . . . . . . . . . . . . . . . . . 506
Connections Connected Services . . . . . . 507
Control Traction and
Electronic Stability . . . . . . 290
Control of a Vehicle . . . . . . . . 235
Controls Steering Wheel . . . . . . . . . . . . . 158
Convex Mirrors . . . . . . . . . . . . . . . . 28
Coolant
EngineTemperature
Gauge . . . . . . . . . . . . . . . . . . . 114, 115
Engine Temperature Warning Light . . . . . . . . . . . . . . 124

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
512 INDEX
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . 225
Cooling System . . . . . . . . . . . . . . 386
Cornering Lamps . . . . . . . . . . . . . 149
Courtesy Lamps . . . . . . . . . . . . . . 150
CourtesyTransportation
Program . . . . . . . . . . . . . . . . . . . . . . 490
Coverage Explanations . . . . . 185
Cruise Control . . . . . . . . . . . . . . . . . 301 Adaptive . . . . . . . . . . . . . . . . . . . . . 304
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Super . . . . . . . . . . . . . . . . . . . . . . . . . . 316
Cupholders . . . . . . . . . . . . . . . . . . . . . . 94
Customer Assistance Offices . . . . . . . . . . . . . . . . . . . . . . . . 485
Text Telephone (TTY)Users . . . . . . . . . . . . . . . . . . . . . . . . 486
Customer Information Publications OrderingInformation . . . . . . . . . . . . . . . . 494
Customer Satisfaction
Procedure . . . . . . . . . . . . . . . . . . . 483
Cybersecurity . . . . . . . . . . . . . . . . 496D
Damage Repair, Collision . . . . . . . . . . . . . . . . . . . . . . . . 491
Danger, Warning, and Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Dashboard . . . . . . . . . . . . . . . . . . . . . . . . . 5
Data Collection Infotainment System . . . . . 498
OnStar . . . . . . . . . . . . . . . . . . . . . . . . 498
Data Recorder
Performance . . . . . . . . . . . . . . . . . 192
Data Recorders, Event . . . . 497
Database Coverage Explanations . . . . . . . . . . . . . . . . . 185
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . 147
Defensive Driving . . . . . . . . . . . . 235
Delayed Locking . . . . . . . . . . . . . . . 20
Destination . . . . . . . . . . . . . . . . . . . . . 176
Diagnostics Connected Services . . . . . . 508
Differential, Limited-Slip . . . . 301
Disabled Vehicle Transporting . . . . . . . . . 450, 452
Distracted Driving . . . . . . . . . . . 234
Dome Lamps . . . . . . . . . . . . . . . . . . . 150 Door
Ajar Light . . . . . . . . . . . . . . . . . . . . . 129
Delayed Locking . . . . . . . . . . . . . 20
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power Locks . . . . . . . . . . . . . . . . . . 20
Drive Belt Routing, Engine . . . . . . . . . . . . . . . . . . . . . . . . . 482
Drive Systems All-Wheel Drive . . . . . . 286, 400
Driver Assistance Systems . . . . . . 333
Information
Center (DIC) . . . . . . . . . . 129, 132
Mode Control . . . . . . . . . . . . . . . 292
Mode Control Light . . . . . . . . 125
Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Driving Assistance Systems . . . . . . 342
Better Fuel Economy . . . . . 234
Characteristics andTowing Tips . . . . . . . . . . . . . . . 358
Competitive . . . . . . . . . . . . . . . . . 298
Defensive . . . . . . . . . . . . . . . . . . . . 235
Distracted . . . . . . . . . . . . . . . . . . . 234
Hill and Mountain Roads . . . . . . . . . . . . . . . . . . . . . . . 252
If the Vehicle is Stuck . . . . 255
Impaired . . . . . . . . . . . . . . . . . . . . . . 235

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
514 INDEX
Frequency StatementRadio . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Front Heated and VentilatedSeats . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Pedestrian Braking (FPB) System . . . . . . . . . . . . . 346
Fuel Additives . . . . . . . . . . . . . . . . . . . . . 355
Economy, Driving forBetter . . . . . . . . . . . . . . . . . . . . . . . 234
Filling a Portable Fuel Container . . . . . . . . . . . . . . . . . . 357
Filling the Tank . . . . . . . . . . . . . 356
Foreign Countries . . . . . . . . . 355
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Prohibited Fuels . . . . . . . . . . . 355
Recommended . . . . . . 354, 355
Top Tier . . . . . . . . . . . . . . . . . . . . . . 354
Fuses Engine CompartmentFuse Block . . . . . . . . . . . . . . . . . 407
Fuses and Circuit
Breakers . . . . . . . . . . . . . . . . . . . . 406
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . 409 Fuses (cont'd)
Rear Compartment
Fuse Block . . . . . . . . . . . . . . . . . . 411
G
Garage Door Opener . . . . . . . . .141Programming . . . . . . . . . . . . . . . . 141
Gas Strut(s) . . . . . . . . . . . . . . . . . . . 402
Gauges
Engine CoolantTemperature . . . . . . . . . . 114, 115
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Odometer . . . . . . . . . . . . . . . . . . . . . . 112
Speedometer . . . . . . . . . . . . . . . . . 112
Tachometer . . . . . . . . . . . . . . . . . . 113
Trip Odometer . . . . . . . . . . . . . . . 112
Warning Lights and
Indicators . . . . . . . . . . . . . . . . . . . 105
General Information Service andMaintenance . . . . . . . . . . . . . . 467
Towing . . . . . . . . . . . . . . . . . . . . . . . . 358
Vehicle Care . . . . . . . . . . . . . . . . 369
Global Positioning System (GPS) . . . . . . . . . . . . . . . . 183
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . 94 GM Mobility
Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . 487
Guidance Problems with theRoute . . . . . . . . . . . . . . . . . . . . . . . . . 184
H
Halogen Bulbs . . . . . . . . . . . . . . . . 403
Hazard WarningFlashers . . . . . . . . . . . . . . . . . . . . . . . 149
Head Restraints . . . . . . . . . . . . . . . 37
Head-Up Display (HUD) . . . . . 136
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . 403
Automatic . . . . . . . . . . . . . . . . . . . . . 148
Bulb Replacement . . . . . . . . . 403
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . 147
Flash-to-Pass . . . . . . . . . . . . . . . . 147
High Intensity Discharge (HID)
Lighting . . . . . . . . . . . . . . . . . . . . . 403
High-Beam On Light . . . . . . . 128
High/Low Beam Changer . . . . . . . . . . . . . . . . . . . . . 147
Lamps On Reminder . . . . . . . 128