service CHEVROLET TRAILBLAZER 2021 Owner's Manual

2021
chevrolet.com (U.S.)
chevrolet.ca (Canada)
Trailblazer
Owner’s Manual
2021 Trailblazer
Canada
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Roadside Assistance:
1-800-243-8872 Customer Assistance:
1-800-222-1020
United States:
Roadside Assistance:
1-800-268-6800
Customer Assistance:
1-800-263-3777
Canada:
Connected Services and OnStar:
1-888-4-ONSTAR
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Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
14400528) - 2021 - CRC - 11/7/19
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Keys, Doors, and Windows . . . . . . . . . . . . . . . 6
Seats and Restraints . . . . . . . . . . . . . . . . . . . . . 36
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Instruments and Controls . . . . . . . . . . . . . . . 82
Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Infotainment System . . . . . . . . . . . . . . . . . . . 121
Climate Controls . . . . . . . . . . . . . . . . . . . . . . . . 174
Driving and Operating . . . . . . . . . . . . . . . . . . 180
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Service and Maintenance . . . . . . . . . . . . . . . 315
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . 328
Customer Information . . . . . . . . . . . . . . . . . . 332
Reporting Safety Defects . . . . . . . . . . . . . . . 340
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Connected Services . . . . . . . . . . . . . . . . . . . . . 348
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Introduction
The names, logos, emblems, slogans, vehicle
model names, and vehicle body designs
appearing in this manual including, but not
limited to, GM, the GM logo, CHEVROLET,
the CHEVROLET Emblem, and TRAILBLAZER
are trademarks and/or service marks of
General Motors LLC, its subsidiaries,
affiliates, or licensors.
For vehicles first sold in Canada, substitute
the name“General Motors of Canada
Company” for Chevrolet Motor Division
wherever it appears in this manual.
This manual describes features that may or
may not be on the vehicle because of
optional equipment that was not purchased
on the vehicle, model variants, country
specifications, features/applications that may not be available in your region, or changes
subsequent to the printing of this owner’s
manual.
Refer to the purchase documentation
relating to your specific vehicle to confirm
the features.
Keep this manual in the vehicle for quick
reference.
Canadian Vehicle Owners
A French language manual can be obtained
from your dealer, at www.helminc.com,
or from:
Propriétaires Canadiens
On peut obtenir un exemplaire de ce guide
en français auprès du concessionnaire ou à
l'adresse suivante:
Helm, Incorporated
Attention: Customer Service
47911 Halyard Drive
Plymouth, MI 48170
USA
Litho in U.S.A.
Part No. 84401923 A First Printing©2019 General Motors LLC. All Rights Reserved.

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
14400528) - 2021 - CRC - 11/7/19
2 Introduction
Using this Manual
To quickly locate information about the
vehicle, use the Index in the back of the
manual. It is an alphabetical list of what is
in the manual and the page number where
it can be found.
About Driving the Vehicle
As with other vehicles of this type, failure to
operate this vehicle correctly may result in
loss of control or a crash. Be sure to read
the driving guidelines in this manual in the
section called“Driving and Operating” and
specifically Driver Behavior 0181, Driving
Environment 0181, and Vehicle Design 0181.
Danger, Warning, and Caution
Warning messages found on vehicle labels
and in this manual describe hazards and
what to do to avoid or reduce them.
{Danger
Danger indicates a hazard with a high
level of risk which will result in serious
injury or death.
{Warning
Warning indicates a hazard that could
result in injury or death.
Caution
Caution indicates a hazard that could
result in property or vehicle damage.
A circle with a slash through it is a safety
symbol which means “Do not,” “Do not do
this,” or“Do not let this happen.”
Symbols
The vehicle has components and labels that
use symbols instead of text. Symbols are
shown along with the text describing the
operation or information relating to a
specific component, control, message, gauge,
or indicator.
M:Shown when the owner’s manual has
additional instructions or information.
*: Shown when the service manual has
additional instructions or information.
0: Shown when there is more information
on another page — “see page.”
Vehicle Symbol Chart
Here are some additional symbols that may
be found on the vehicle and what they
mean. See the features in this manual for
information.
u: Air Conditioning System
G:Air Conditioning Refrigerant Oil
9:Airbag Readiness Light
!:Antilock Brake System (ABS)
$:Brake System Warning Light
9:Dispose of Used Components Properly
P:Do Not Apply High Pressure Water
B:Engine Coolant Temperature
_:Flame/Fire Prohibited
H: Flammable
[:Forward Collision Alert
R:Fuse Block Cover Lock Location

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
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8 Keys, Doors, and Windows
Press the key release button on the RKE
transmitter to extend the key blade. Press
the button and the key blade to retract
the key.
If it becomes difficult to turn the key in the
ignition, inspect the key blade for debris.
Periodically clean with a brush or pick.
See your dealer if a new key is needed.
With an active OnStar or connected service
plan, an OnStar Advisor may remotely
unlock the vehicle. SeeOnStar Overview
0 343.
Keys (Keyless Access)
{Warning
Leaving children in a vehicle with a
Remote Keyless Entry (RKE) transmitter is
dangerous and children or others could
be seriously injured or killed. They could
operate the power windows or other
controls or make the vehicle move. The
windows will function with the RKE
transmitter in the vehicle, and children or
others could be caught in the path of a
closing window. Do not leave children in
a vehicle with an RKE transmitter.
The key inside the Remote Keyless Entry
(RKE) transmitter is used for the driver door.
To remove the key, press the button on the
side of the RKE transmitter and pull the key
out. Never pull the key out without pressing
the button.
If it becomes difficult to turn the key,
inspect the key blade for debris.
See your dealer if a new key is needed.
With an active OnStar or connected service
plan, an OnStar Advisor may remotely
unlock the vehicle. See OnStar Overview
0 343.

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
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Keys, Doors, and Windows 9
Remote Keyless Entry (RKE)
System
SeeRadio Frequency Statement 0340.
If there is a decrease in the remote key
operating range:
.Check the distance. The remote key may
be too far from the vehicle.
.Check the location. Other vehicles or
objects may be blocking the signal.
.Check the remote key battery. See
“Battery Replacement” later in this
section.
.If the remote key is still not working
correctly, see your dealer or a qualified
technician for service.
Remote Keyless Entry (RKE)
System Operation (Key Access)
The RKE transmitter may work up to 60 m
(197 ft) away from the vehicle.
Other conditions can affect the performance
of the transmitter. See Remote Keyless Entry
(RKE) System 09.
The following may be available:
Q:Press to lock all doors and, if equipped,
the locking fuel door. The hazard warning
lamps may flash and/or the horn may
sound on the second press to indicate
locking. See Vehicle Personalization 0110.
If the driver door is open when
Qis pressed
and enabled through vehicle personalization,
all doors will lock and then the driver door
will immediately unlock. See Vehicle
Personalization 0110.
Pressing
Qmay also arm the alarm system.
See Vehicle Alarm System 029.
K:Press to unlock the driver door. Press
again within five seconds to unlock all
doors.The RKE transmitter can be
programmed to unlock all doors on the first
button press. See Vehicle Personalization
0 110. The hazard warning lamps may flash
to indicate unlocking. See Vehicle
Personalization 0110.
Pressing
Kwill disarm the alarm system.
See Vehicle Alarm System 029.
If equipped, pressing
Kwill also unlock the
fuel door.
/: If equipped, pressQand then press
and hold
/to start the engine from
outside the vehicle using the RKE
transmitter. See Remote Vehicle Start 017.
The RKE transmitter buttons will not operate
when the key is in the ignition.
Programming Keys to the Vehicle
Only RKE keys programmed to this vehicle
will work. If a key is lost or stolen, a
replacement can be purchased and
programmed through your dealer. When the
replacement key is programmed to this
vehicle, all remaining keys must also be

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
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24 Keys, Doors, and Windows
To power open or close the liftgate, select
MAX or 3/4 mode.
.Pressbtwice quickly on the RKE
transmitter until the liftgate moves.
.Press8on the driver door. The driver
door must either be unlocked or locked
without the security armed.
.Press the touch pad on the underside of
the liftgate handle after unlocking all
doors. A locked vehicle can be opened if
the RKE transmitter is within 1 m (3 ft) of
the touch pad.
.Presslon the bottom edge of the
liftgate to the left of the latch to close. Press any liftgate button, the touch pad,
or
bon the RKE transmitter while the
liftgate is moving to stop it. Pressing any
liftgate button or pressing
btwice quickly
on the RKE transmitter restarts the
operation in the reverse direction. Pressing
the touch pad on the liftgate handle will
restart the motion, but only in the opening
direction.
Caution
Manually forcing the liftgate to open or
close during a power cycle can damage
the vehicle. Allow the power cycle to
complete.
The power liftgate may be temporarily
disabled under extreme low temperatures,
or after repeated power cycling over a short
period of time. If this occurs, the liftgate can
still be operated manually.
If the vehicle is shifted out of P (Park) while
the power function is in progress, the
liftgate will continue to completion. If the
vehicle is accelerated before the liftgate has
completed moving, the liftgate may stop or
reverse direction. Check for DIC messages
and make sure the liftgate is closed and
latched before driving. Falling Liftgate Detection
If the power liftgate automatically closes
after a power opening cycle, it indicates that
the system is reacting to excess weight on
the liftgate or a possible support strut
failure. A repetitive chime will sound while
the falling liftgate detection feature is
operating. Remove any excess weight. If the
liftgate continues to automatically close
after opening, see your dealer for service
before using the power liftgate.
Interfering with the power liftgate motion
or manually closing the liftgate too quickly
after power opening may resemble a
support strut failure. This could also activate
the falling liftgate detection feature. Allow
the liftgate to complete its operation and
wait a few seconds before manually closing
the liftgate.
Obstacle Detection Features
If the liftgate encounters an obstacle during
a power open or close cycle, the liftgate will
automatically reverse direction and move a
short distance away from the obstacle. After
removing the obstruction, the power liftgate
operation can be used again. If the liftgate
encounters multiple obstacles on the same
power cycle, the power function will

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
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30 Keys, Doors, and Windows
How to Detect a Tamper Condition
IfKis pressed and the horn chirps and the
lights flash three times, the alarm was
activated while the alarm system was
armed.
If the alarm system has been activated, a
message will appear on the DIC.
Immobilizer
See Radio Frequency Statement 0340.
Immobilizer Operation
This vehicle has a passive theft-deterrent
system.
The system does not have to be manually
armed or disarmed.
The vehicle is automatically immobilized
when the vehicle is turned off.
The immobilization system is disarmed
when the ignition is on or in ACC/
ACCESSORY and a valid transmitter is
present in the vehicle.
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 RKE
transmitters matched to an immobilizer
control unit in the vehicle. Only a correctly
matched RKE transmitter will start the
vehicle. If the transmitter is ever damaged,
the vehicle may not start.
When trying to start the vehicle, the
security light may come on briefly when the
ignition is turned on.
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, and the RKE transmitter appears to
be undamaged, try another transmitter. Or,
try placing the transmitter in the
transmitter pocket located in the center
console. See Starting the Vehicle With a Low Transmitter Battery under
Remote
Keyless Entry (RKE) System Operation (Key
Access) 09or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 011.
If the ignition mode will not change with
the other transmitter or with a transmitter
in the transmitter pocket, the vehicle needs
service. If the ignition does change modes,
the first transmitter may be faulty. See a
dealer who can service the theft-deterrent
system and have a new RKE transmitter
programmed to the vehicle.
It is possible for the immobilizer system to
learn new or replacement RKE transmitters.
Up to eight transmitters can be
programmed for the vehicle. To program
additional transmitters, see Programming
Transmitters to the Vehicle under Remote
Keyless Entry (RKE) System Operation (Key
Access) 09or
Remote Keyless Entry (RKE) System
Operation (Keyless Access) 011.
Do not leave the transmitter or device that
disarms or deactivates the theft-deterrent
system in the vehicle.

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
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56 Seats and Restraints
Warning (Continued)
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 0341 and
Event Data Recorders 0342.
.Let only qualified technicians work on the
airbag systems. 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.
United States
Canada
The words ON and OFF, or 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, or the symbol
for on or off, will be visible. See Passenger
Airbag Status Indicator 095. The passenger sensing system turns off the
front outboard passenger frontal airbag and
knee airbag under certain conditions. No
other airbag is affected by the passenger
sensing system.
The passenger sensing system works with
sensors that are part of the front outboard
passenger seat and seat belt. The sensors
are designed to detect the presence of a
properly seated occupant and determine if
the front outboard passenger frontal airbag
and knee airbag should be allowed to inflate
or not.
According to accident statistics, children are
safer when properly secured in a rear seat
in the correct child restraint for their weight
and size.
Whenever possible, children aged 12 and
under should be secured in a rear seating
position.
Never put a rear-facing child seat in the
front. This is because the risk to the
rear-facing child is so great, if the airbag
inflates.

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Seats and Restraints 57
{Warning
A child in a rear-facing child restraint can
be seriously injured or killed if the
passenger frontal airbag inflates. This is
because the back of the rear-facing child
restraint would be very close to the
inflating airbag. A child in a
forward-facing child restraint can be
seriously injured or killed if the passenger
frontal airbag inflates and the passenger
seat is in a forward position.
Even if the passenger sensing system has
turned off the front outboard passenger
airbag(s), no system is fail-safe. No one
can guarantee that an airbag will not
deploy under some unusual circumstance,
even though the airbag(s) are off.
Never put a rear-facing child restraint in
the front seat, even if the airbag is off.
If securing a forward-facing child restraint
in the front outboard passenger seat,
always move the seat as far back as it
will go. It is better to secure child
restraints in the rear seat. Consider using
another vehicle to transport the child
when a rear seat is not available.The passenger sensing system is designed to
turn off the front outboard passenger
frontal airbag and knee airbag if:.The front outboard passenger seat is
unoccupied.
.The system determines that an infant is
present in a child restraint.
.A front outboard passenger takes his/her
weight off of the seat for a period
of time.
.There is a critical problem with the airbag
system or the passenger sensing system.
When the passenger sensing system has
turned off the front outboard passenger
frontal airbag and knee airbag, the OFF
indicator will light and stay lit as a reminder
that the airbags are off. See Passenger
Airbag Status Indicator 095.
The passenger sensing system is designed to
turn on the front outboard passenger frontal
airbag and knee airbag anytime the system
senses that a person of adult size is sitting
properly in the front outboard
passenger seat.
When the passenger sensing system has
allowed the airbag(s) to be enabled, the ON
indicator will light and stay lit as a reminder
that the airbag(s) are active. For some children, including children in child
restraints, and for very small adults, the
passenger sensing system may or may not
turn off the front outboard passenger
frontal airbag and knee airbag, depending
upon the person’s seating posture and body
build. Everyone in the vehicle who has
outgrown child restraints should wear a seat
belt properly
—whether or not there is an
airbag for that person.{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 Airbag Readiness Light 095
for more information, including important
safety information.
If the On Indicator Is Lit for a Child
Restraint
The passenger sensing system is designed to
turn off the front outboard passenger
frontal airbag and knee airbag if the system
determines that an infant is present in a
child restraint. If a child restraint has been
installed and the ON indicator is lit:

Chevrolet Trailblazer Owner Manual (GMNA-Localizing-U.S./Canada-
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Seats and Restraints 59
6. Restart the vehicle and have the personremain in this position for two to
three minutes after the ON indicator
is lit.
{Warning
If the front outboard passenger airbag is
turned off for an adult-sized occupant,
the airbag will not be able to inflate and
help protect that person in a crash,
resulting in an increased risk of serious
injury or even death. An adult-sized
occupant should not ride in the front
outboard passenger seat, if the passenger
airbag OFF indicator is lit.
Additional Factors Affecting System
Operation
Seat belts help keep the passenger in
position on the seat during vehicle
maneuvers and braking, which helps the
passenger sensing system maintain the
passenger airbag status. See “Seat Belts”
and “Child Restraints” in the Index for
additional information about the importance
of proper restraint use. A thick layer of additional material, such as
a blanket or cushion, or aftermarket
equipment such as seat covers, seat heaters,
and seat massagers can affect how well the
passenger sensing system operates. We
recommend that you not use seat covers or
other aftermarket equipment except when
approved by GM for your specific vehicle.
See
Adding Equipment to the
Airbag-Equipped Vehicle 060 for more
information about modifications that can
affect how the system operates.
The ON indicator may be lit if an object,
such as a briefcase, handbag, grocery bag,
laptop, or other electronic device is put on
an unoccupied seat. If this is not desired
remove the object from the seat.{Warning
Stowing articles under the passenger seat
or between the passenger seat cushion
and seatback may interfere with the
proper operation of the passenger
sensing system.
Servicing the Airbag-Equipped
Vehicle
Airbags affect how the vehicle should be
serviced. There are parts of the airbag
system in several places around the vehicle.
Your dealer and the service manual have
information about servicing the vehicle and
the airbag system. To purchase a service
manual, see Publication Ordering
Information 0339.
{Warning
For up to 10 seconds after the vehicle is
turned off and the battery is
disconnected, an airbag can still inflate
during improper service. You can be
injured if you are close to an airbag
when it inflates. Avoid yellow connectors.
They are probably part of the airbag
system. Be sure to follow proper service
procedures, and make sure the person
performing work for you is qualified to
do so.