check engine light CADILLAC CT5 2023 Owners Manual

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
Introduction 7
18. Cruise Control0302 (If
Equipped).
Adaptive Cruise Control
(Advanced) 0305 (If
Equipped).
Forward Collision Alert
(FCA) System 0346 (If
Equipped).
Heated Steering Wheel
0 105 (If Equipped).
19. Hood Release. See Hood 0376.
20. Data Link Connector (DLC) (Out of View). See
Malfunction Indicator
Lamp (Check Engine Light)
0125.
21. Instrument Panel Illumination Control 0157.
22. Head-Up Display (HUD) 0143 (If Equipped).
23. Electric Parking Brake (EPB) Switch. See Electric
Parking Brake 0288.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
16 Keys, Doors, and Windows
2. Use the mechanical keyblade in the slot to remove
the battery cover by hand.
3. Remove the seal by pullingon the tab to access the
battery.
4. Remove the old battery. Do not use a metal object.
5. Insert the new battery, positive side toward the
back cover. Replace with a
CR2450 or equivalent
battery.
6. Place the seal back into the groove around the
battery compartment.
7. Reassemble the battery cover by snapping it back
on the remote key.
8. Reinsert the mechanical key.
Remote Vehicle Start
This feature allows the engine
to be started from outside the
vehicle. It is not available on
vehicles with a manual
transmission.
S:This button on the remote
key is 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 and
ventilated front seats may
also come on when the vehicle
personalization setting is
enabled. See Heated and
Ventilated Front Seats
051.
If equipped with a remote
start heated steering wheel, it
may come on during a remote
start. See Heated Steering
Wheel 0105.
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.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
32 Keys, Doors, and Windows
The security light, in the
instrument cluster, comes on if
there is a problem with arming
or disarming the
theft-deterrent system.
The system has one or more
remote keys matched to an
immobilizer control unit in the
vehicle. Only a correctly
matched remote key will start
the vehicle. If the remote key
is ever damaged, you may not
be able to start your vehicle.
When trying to start the
vehicle, the security light may
come on briefly.
If the engine does not start
and the security light stays on,
there is a problem with the
system. Turn the ignition off
and try again.If the vehicle will not change
ignition modes (accessory
mode, on, off), and the remote
key appears to be undamaged,
try another remote key. Or,
you may try placing the
remote key in the backup
location. See Remote Key
Operation
09.
If the ignition modes will not
change with the other remote
key or in the backup location,
the vehicle needs service.
If the ignition does change
modes, the first remote key
may be faulty. See your dealer.
It is possible for the
immobilizer system to learn
new or replacement remote
keys. Up to eight remote keys
can be programmed for the
vehicle. To program additional
remote keys, see
“Programming Remote Keys to
the Vehicle” under Remote
Key Operation 09. Do not leave the remote key
or device that disarms or
deactivates the
theft-deterrent system in the
vehicle.Exterior Mirrors
Convex Mirrors
{Warning
A convex mirror can make
things, like other vehicles,
look farther away than they
really are. If you cut too
sharply into the right lane,
you could hit a vehicle on
the right. Check the inside
mirror or glance over your
shoulder before changing
lanes.
The passenger side mirror is
convex shaped. A convex
mirror's surface is curved so
more can be seen from the
driver seat.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
72 Seats and Restraints
{Warning
A crash severe enough to
inflate the airbags may have
also damaged important
functions in the vehicle, such
as the fuel system, brake
and steering systems, etc.
Even if the vehicle appears
to be drivable after a
moderate crash, there may
be concealed damage that
could make it difficult to
safely operate the vehicle.
Use caution if you should
attempt to restart the
engine after a crash has
occurred.
In many crashes severe
enough to inflate the airbag,
windshields are broken by
vehicle deformation. Additional
windshield breakage may also
occur from the front outboard
passenger airbag.
.Airbags are designed to
inflate only once. After an
airbag inflates, you will need
some new parts for the
airbag system. If you do not
get them, the airbag system
will not be there to help
protect you in another crash.
A new system will include
airbag modules and possibly
other parts. The service
manual for the vehicle
covers the need to replace
other parts.
.The vehicle has a crash
sensing and diagnostic
module which records
information after a crash.
See Vehicle Data Recording
and Privacy 0498 and
Event Data Recorders 0499.
.Let only qualified technicians
work on the airbag system.
Improper service can mean
that an airbag system will
not work properly. See your
dealer for service.
Passenger Sensing
System
The vehicle has a passenger
sensing system for the front
outboard passenger position.
The passenger airbag status
indicator will light on the
overhead console when the
vehicle is started.
The words ON and OFF, and
the symbols for on and off, will
be visible during the system
check. When the system check
is complete, either the word
ON or OFF, and the symbol for
on or off, will be visible. See
Passenger Airbag Status
Indicator 0124.
The passenger sensing
system turns off the front
outboard passenger frontal
airbag and knee airbag under

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
Instruments and Controls 103
Instruments and
Controls
Controls
Steering WheelAdjustment . . . . . . . . . . . . . . . . . 104
Heated Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . 105
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Windshield Wiper/ Washer . . . . . . . . . . . . . . . . . . . . . . 105
Compass . . . . . . . . . . . . . . . . . . . . . 107
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Power Outlets . . . . . . . . . . . . . . 108
Wireless Charging . . . . . . . . . 109
Warning Lights, Gauges,
and Indicators
Warning Lights, Gauges, and Indicators . . . . . . . . . . . . . . 112
Instrument Cluster (Base
Level) . . . . . . . . . . . . . . . . . . . . . . . . . 113
Instrument Cluster (Uplevel) . . . . . . . . . . . . . . . . . . . . . 115
Speedometer . . . . . . . . . . . . . . . . 119
Odometer . . . . . . . . . . . . . . . . . . . . . 119
Trip Odometer . . . . . . . . . . . . . . . 119
Tachometer . . . . . . . . . . . . . . . . . 120
Fuel Gauge . . . . . . . . . . . . . . . . . . . 120 Engine Coolant
Temperature Gauge
(Base Level) . . . . . . . . . . . . . . . . . 121
Engine Coolant Temperature Gauge
(Uplevel) . . . . . . . . . . . . . . . . . . . . . 122
Seat Belt Reminders . . . . . . 122
Airbag Readiness Light . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . 124
Charging System Light . . . 124
Malfunction Indicator Lamp (Check Engine
Light) . . . . . . . . . . . . . . . . . . . . . . . . . 125
Brake System Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Electric Parking Brake Light . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Service Electric Parking Brake Light . . . . . . . . . . . . . . . . . 128
Antilock Brake System (ABS) Warning Light . . . . . 128
Performance Shifting Light . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Automatic Vehicle Hold (AVH) Light . . . . . . . . . . . . . . . . . 129
Lane Keep Assist (LKA) Light . . . . . . . . . . . . . . . . . . . . . . . . . . 129 Automatic Emergency
Braking (AEB) Disabled
Light . . . . . . . . . . . . . . . . . . . . . . . . . 130
Vehicle Ahead Indicator . . . . . . . . . . . . . . . . . . . . 130
Pedestrian Ahead Indicator . . . . . . . . . . . . . . . . . . . . 130
Traction Off Light . . . . . . . . . 130
StabiliTrak OFF Light . . . . . 131
Traction Control System (TCS)/StabiliTrak
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Engine Coolant Temperature Warning
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Driver Mode Control Light . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Tire Pressure Light . . . . . . . 133
Engine Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . 134
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . 134
Security Light . . . . . . . . . . . . . . . 135
High-Beam On Light . . . . . . 135
Lamps On Reminder . . . . . . 135
Cruise Control Light . . . . . . 135
Door Ajar Light . . . . . . . . . . . . . 136

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
112 Instruments and Controls
THIS SOFTWARE IS
PROVIDED BY THE
COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF
MERCHANTABILITY AND
FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE
COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL,
EXEMPLARY, ORCONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR
BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY
WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF
ADVISED OF THE
POSSIBILITY OF SUCH
DAMAGE.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 CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
124 Instruments and Controls
Passenger Airbag
Status Indicator
The vehicle has a passenger
sensing system. See
Passenger Sensing System
072 for important safety
information. The overhead
console has a passenger
airbag status indicator.
When the vehicle is started,
the passenger airbag status
indicator will light ON and OFF,
and the symbols for on and
off, for several seconds as a
system check. Then, after
several more seconds, the
status indicator will light either
ON or OFF, and either the
symbol for on or off, to let you
know the status of the front
outboard passenger frontal
airbag and knee airbag. If the word ON, and 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, and the off
symbol, is lit on the passenger
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, all of
the symbols remain lit, or if no
symbols are lit, or if the airbag
readiness light is on, there
may be a problem with the
lights or the passenger
sensing system. See your
dealer for service right away.
{Warning
If the airbag readiness light
ever comes on and stays on,
it means that something may
be wrong with the airbag
(Continued)
Warning (Continued)
system. To help avoid injury
to yourself or others, have
the vehicle serviced right
away. See Airbag Readiness
Light0123 for more
information, including
important safety
information.
Charging System
Light
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.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
Instruments and Controls 125
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. Find a safe
place to stop the vehicle.
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 mayrequire service. The light
should come on to show that it
is working when the ignition is
in Service Mode. See Ignition
Positions
0267.
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
(Continued)
Caution (Continued)
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
Modifications0374.
If the light is flashing : A
malfunction has been
detected that could damage
the emission control system

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
126 Instruments and Controls
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 0362. 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
Recommended Fuel (LSY
2.0L L4 Engine) 0360 or
Recommended Fuel (LGY
3.0L V6 and LT4 6.2L
V8 Engines) 0361.
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 0372.
See your dealer if assistance
is needed.

Cadillac CT5 Owner Manual (GMNA-Localizing-U.S./Canada-16500419) -
2023 - CRC - 5/6/22
134 Instruments and Controls
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 every time the
vehicle is started. See Tire
Pressure Monitor Operation
0431.
Engine Oil Pressure
Light
Caution
Driving the vehicle with low
engine oil pressure can
damage the engine and the
repairs would not be
covered by the vehicle
warranty.
If the engine oil pressure
light comes on while driving:
1. Stop in a safe location and turn off the engine.
(Continued)
Caution (Continued)
2. Check the oil level. SeeEngine Oil 0383.
3. Add oil if the oil level is below the normal
operating range.
4. Restart the vehicle. If the engine oil pressure light
stays on for more than
10 seconds, turn the
vehicle back off. Do not
restart the vehicle. See
your dealer for service.
This light should come on
briefly when the engine starts.
When the engine is off and the
vehicle is on, the light should
remain illuminated. If it does
not come on under either
condition, contact your dealer. If the light comes on and stays
on when the engine is running,
it may not have adequate oil
pressure. The oil level may be
low or there may be some
other oil system problem. Turn
the engine off when it is safe
to do so and contact your
dealer.
Low Fuel Warning
Light
A Low Fuel Warning Light
near the fuel gauge comes on
briefly when the ignition is
turned on as a check to show
it is working.
It also comes on when the fuel
gauge indicator nears empty.
The light turns off when fuel is
added. If it does not, have the
vehicle serviced.