2021 CADILLAC XT6 battery replacement

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
KEYS, DOORS, AND WINDOWS 7
The key, inside the Remote Keyless
Entry (RKE) transmitter, can be used
for all locks.
To remove the key, press the button
on the side of the transmitter, near
the bottom, 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.
Periodically, clean with a brush or
a pick.
See your dealer if a new key is needed.
Contact Roadside Service if locked out
of the vehicle. SeeRoadside Service
0 401.
With an active OnStar or connected
service plan, an OnStar Advisor may
remotely unlock the vehicle. See
OnStar Overview 0410.
Remote Keyless Entry
(RKE) System
See Radio Frequency Statement 0406.
If there is a decrease in the key
operating range:
.Check the distance. The key may be
too far from the vehicle.
.Check the location. Other vehicles
or objects may be blocking the
signal.
.Check the key battery. See “Battery
Replacement ”later in this section.
.If the key is still not working
correctly, see your dealer or a
qualified technician for service.
Remote Keyless Entry
(RKE) System Operation
The Keyless Access system allows for
vehicle entry when the Remote
Keyless Entry (RKE) transmitter is
within 1 m (3 ft). See “Keyless Access
Operation ”following.
The RKE transmitter functions may
work up to 60 m (197 ft) away from
the vehicle.
Other conditions can impact the
performance of the transmitter. See
Remote Keyless Entry (RKE) System
0 7.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
KEYS, DOORS, AND WINDOWS 11
Key Access
To access a vehicle with a weak
transmitter battery, seeDoor Locks
0 15.
Programming Transmitters to
the Vehicle
Only RKE transmitters programmed to
the vehicle will work. If a transmitter
is lost or stolen, a replacement can be
purchased and programmed through
your dealer.
The vehicle can be reprogrammed so
that lost or stolen transmitters no
longer work. Each vehicle can have up
to eight transmitters matched to it.
Programming with Recognized
Transmitters
A new transmitter can be programmed
to the vehicle when there are two
recognized transmitters.
To program, the vehicle must be off
and all of the transmitters, both
currently recognized and new, must
be with you.
1. Place the two recognized transmitters in the cupholder. 2. Remove the key lock cylinder cap
on the driver door handle. See Door
Locks 015. Insert the vehicle key of
the transmitter into the key lock
cylinder on the driver door and
turn the key counterclockwise, to
the unlock position, five times
within 10 seconds.
The DIC displays READY FOR
REMOTE #3, 4, 5, ETC.
3. Place the new transmitter into the transmitter pocket. The transmitter
pocket is inside the center console
storage area between the driver and
front passenger seats. The storage area will need to be opened and the
storage tray lifted up to access the
transmitter pocket.
4. Press ENGINE START/STOP. When the transmitter is learned the DIC
display will show that it is ready to
program the next transmitter.
5. Remove the transmitter from the transmitter pocket and press the
transmitter
KorQbutton.
To program additional transmitters,
repeat Steps 3–5.
When all additional transmitters
are programmed, press and hold
ENGINE START/STOP for
12 seconds to exit
programming mode.
6. Return the key back into the transmitter.
7. Replace the key lock cylinder cap. See Door Locks 015.
Programming without Recognized
Transmitters
If two currently recognized
transmitters are not available, follow
this procedure to program up to eight
transmitters. This feature is not

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
KEYS, DOORS, AND WINDOWS 13
2. Place the transmitter in thetransmitter pocket.
3. With the vehicle in P (Park) or N (Neutral), press the brake pedal
and ENGINE START/STOP.
Replace the transmitter battery as
soon as possible.
Battery Replacement
{Warning
Never allow children to play with
the RKE transmitter. The
transmitter contains a small
battery, which can be a choking
(Continued)
Warning (Continued)
hazard. If swallowed, internal burns
can occur, resulting in severe injury
or death. Seek medical attention
immediately if a battery is
swallowed.
{Warning
To avoid personal injury, do not
touch metal surfaces on the RKE
transmitter when it has been
exposed to extreme heat. These
surfaces can be hot to the touch at
temperatures above 59 °C (138 °F).
Caution
When replacing the battery, do not
touch any of the circuitry on the
transmitter. Static from your body
could damage the transmitter.
Caution
Always replace the battery with the
correct type. Replacing the battery
with an incorrect type could
potentially create a risk of battery
explosion. Dispose of used batteries
according to instructions and local
laws. Do not attempt to burn,
crush, or cut the used battery, and
avoid exposing the battery to
environments with extremely low
air pressures or high temperatures.
Replace the battery if the DIC displays
REPLACE BATTERY IN REMOTE KEY.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
130 INSTRUMENTS AND CONTROLS
pressingV. The messages that require
immediate action cannot be cleared
until that action is performed.
All messages should be taken
seriously; clearing the message does
not correct the problem.
If a SERVICE message appears, see
your dealer.
Follow the instructions given in the
messages. The system displays
messages regarding the following
topics:
.Service Messages
.Fluid Levels
.Vehicle Security
.Brakes
.Steering
.Ride Control Systems
.Driver Assistance Systems
.Cruise Control
.Lighting and Bulb Replacement
.Wiper/Washer Systems
.Doors and Windows
.Seat Belts
.Airbag Systems
.Engine and Transmission
.Tire Pressure
.Battery
Engine Power Messages
ENGINE POWER IS REDUCED
This message displays when the
vehicle's propulsion power is reduced.
A reduction in propulsion power can
affect the vehicle's ability to
accelerate. If this message is on, but
there is no observed reduction in
performance, proceed to your
destination. Under certain conditions
the performance may be reduced the
next time the vehicle is driven. The
vehicle may be driven while this
message is on, but maximum
acceleration and speed may be
reduced. Anytime this message stays
on, or displays repeatedly, the vehicle
should be taken to your dealer for
service as soon as possible.
Under certain operating conditions,
propulsion will be disabled. Try
restarting after the ignition has been
off for 30 seconds.
Vehicle Speed Messages
SPEED LIMITED TO
XXX KM/H (MPH)
This message shows that the vehicle
speed has been limited to the speed
displayed. The limited speed is a
protection for various propulsion and
vehicle systems, such as lubrication,
thermal, brakes, suspension, Teen
Driver if equipped, or tires.
Vehicle Personalization
The following are all possible vehicle
personalization features. Depending
on the vehicle, some may not be
available.
For System, Apps, and Personal
features and functions, see Settings
0 188.
To access the vehicle
personalization menu: 1. Touch the Settings icon on the Home Page of the infotainment
display.
2. Touch Vehicle to display a list of available options.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
VEHICLE CARE 303
Vehicle Care
General Information
General Information . . . . . . . . . . . . . 304
California Proposition65 Warning . . . . . . . . . . . . . . . . . . . . . 304
California Perchlorate Materials Requirements . . . . . . . . . . . . . . . . . . . 305
Accessories and Modifications . . . . . . . . . . . . . . . . . . . 305
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . . . . . . 305
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . . . . . . 308
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . 311
Engine Oil Life System . . . . . . . . . . . 313
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
Engine Air Filter Life System . . . . 314
Engine Air Cleaner/Filter . . . . . . . . . 315
Cooling System . . . . . . . . . . . . . . . . . . . 316
Engine Overheating . . . . . . . . . . . . . . 320
Washer Fluid . . . . . . . . . . . . . . . . . . . . . 321
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . 322 Battery - North America . . . . . . . . . 323
All-Wheel Drive . . . . . . . . . . . . . . . . . . 324
Park Brake and P (Park)
Mechanism Check . . . . . . . . . . . . . . 324
Wiper Blade Replacement . . . . . . . 325
Windshield Replacement . . . . . . . . 326
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . 326
Headlamp Aiming
Front Headlamp Aiming . . . . . . . . . 327
Bulb Replacement
LED Lighting . . . . . . . . . . . . . . . . . . . . . 327
Electrical System
Electrical System Overload . . . . . . 327
Fuses and Circuit Breakers . . . . . . 328
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Instrument Panel Fuse Block . . . . 332
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
All-Season Tires . . . . . . . . . . . . . . . . . . 337
Winter Tires . . . . . . . . . . . . . . . . . . . . . . 338
Summer Tires . . . . . . . . . . . . . . . . . . . . 338
Tire Sidewall Labeling . . . . . . . . . . . 339 Tire Designations . . . . . . . . . . . . . . . . . 340
Tire Terminology and
Definitions . . . . . . . . . . . . . . . . . . . . . . 341
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . 343
Tire Pressure for High-Speed Operation . . . . . . . . . . . . . . . . . . . . . . . . 345
Tire Pressure Monitor System . . . 346
Tire Pressure Monitor Operation . . . . . . . . . . . . . . . . . . . . . . . . 347
Tire Inspection . . . . . . . . . . . . . . . . . . . 350
Tire Rotation . . . . . . . . . . . . . . . . . . . . . 351
When It Is Time for New Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Buying New Tires . . . . . . . . . . . . . . . . 353
Different Size Tires and Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . 354
Uniform Tire Quality Grading . . . 354
Wheel Alignment and Tire Balance . . . . . . . . . . . . . . . . . . . . . . . . . . 356
Wheel Replacement . . . . . . . . . . . . . . 356
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . 356
If a Tire Goes Flat . . . . . . . . . . . . . . . . 357
Tire Changing . . . . . . . . . . . . . . . . . . . . . 358
Compact Spare Tire . . . . . . . . . . . . . . 364
Jump Starting
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . . . . . 364

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
VEHICLE CARE 323
.A fluid leak in the brake hydraulic
system. Have the brake hydraulic
system fixed. With a leak, the
brakes will not work well.
Always clean the brake fluid reservoir
cap and the area around the cap
before removing it.
Do not top off the brake fluid. Adding
fluid does not correct a leak. If fluid is
added when the linings are worn,
there will be too much fluid when
new brake linings are installed. Add or
remove fluid, as necessary, only when
work is done on the brake hydraulic
system.
{Warning
If too much brake fluid is added, it
can spill on the engine and burn,
if the engine is hot enough. You or
others could be burned, and the
vehicle could be damaged. Add
brake fluid only when work is done
on the brake hydraulic system.
When the brake fluid falls to a low
level, the brake warning light comes
on. See Brake System Warning Light
0 117. Brake fluid absorbs water over time
which degrades the effectiveness of
the brake fluid. Replace brake fluid at
the specified intervals to prevent
increased stopping distance. See
Maintenance Schedule
0380.
What to Add
Use only GM approved DOT 3 brake
fluid from a clean, sealed container.
See Recommended Fluids and
Lubricants 0389.
{Warning
The wrong or contaminated brake
fluid could result in damage to the
brake system. This could result in
the loss of braking leading to a
possible injury. Always use the
proper GM approved brake fluid.
Caution
If brake fluid is spilled on the
vehicle's painted surfaces, the paint
finish can be damaged. Immediately
wash off any painted surface.
Battery - North America
The original equipment battery is
maintenance free. Do not remove the
cap and do not add fluid.
Refer to the replacement number on
the original battery label when a new
battery is needed. For replacement of
the battery, see your dealer.
The vehicle has an Absorbed Glass
Mat (AGM) 12-volt battery.
Installation of a standard 12-volt
battery will result in reduced 12-volt
battery life.
When using a 12-volt battery charger
on the 12-volt AGM battery, some
chargers have an AGM battery setting
on the charger. If available, use the
AGM setting on the charger, to limit
charge voltage to 14.8 volts.
Stop/Start System
This vehicle has a Stop/Start system
to shut off the engine to help
conserve fuel. See Stop/Start System
0 234.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
386 SERVICE AND MAINTENANCE
Footnotes—Maintenance Schedule
Additional Required Services -
Severe
(1) Or every two years, whichever
comes first. More frequent passenger
compartment air filter replacement
may be needed if driving in areas with
heavy traffic, poor air quality, high
dust levels, or environmental
allergens. Passenger compartment air
filter replacement may also be needed
if there is reduced airf low, window
fogging, or odors. Your GM dealer can
help determine when to replace the
filter.
(2) Visually check all fuel and vapor
lines and hoses for proper attachment,
connection, routing, and condition.
(3) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water can
overcome the seals and contaminate
the transfer case fluid. Contaminated
fluid will decrease the life of the
transfer case and/or axles and should
be replaced.
(4) Or every five years, whichever
comes first. See Cooling System0316. (5)
Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage; replace,
if needed.
(6) Replace brake fluid every five
years. See Brake Fluid 0322.
(7) Or every 12 months, whichever
comes first. See Wiper Blade
Replacement 0325.
(8) Or every 10 years, whichever
comes first. See Gas Strut(s)0326.
(9) Replace air conditioning desiccant
every seven years.
Special Application
Services
.Severe Commercial Use Vehicles
Only: Lubricate chassis components
every oil change.
.Have underbody flushing service
performed. See "Underbody
Maintenance" in Exterior Care0370.
Additional Maintenance
and Care
Your vehicle is an important
investment and caring for it properly
may help to avoid future costly
repairs. To maintain vehicle
performance, additional maintenance
services may be required.
It is recommended that your dealer
perform these services —their trained
dealer technicians know your vehicle
best. Your dealer can also perform a
thorough assessment with a
multi-point inspection to recommend
when your vehicle may need
attention.
The following list is intended to
explain the services and conditions to
look for that may indicate services are
required.
Battery
The 12-volt battery supplies power to
start the engine and operate any
additional electrical accessories.
.To avoid break-down or failure to
start the vehicle, maintain a battery
with full cranking power.

Cadillac XT6 Owner Manual (GMNA-Localizing-U.S./Canada-14574701) -
2021 - CRC - 2/8/21
SERVICE AND MAINTENANCE 387
.Trained dealer technicians have the
diagnostic equipment to test the
battery and ensure that the
connections and cables are
corrosion-free.
Belts
.Belts may need replacing if they
squeak or show signs of cracking or
splitting.
.Trained dealer technicians have
access to tools and equipment to
inspect the belts and recommend
adjustment or replacement when
necessary.
Brakes
Brakes stop the vehicle and are crucial
to safe driving.
.Signs of brake wear may include
chirping, grinding, or squealing
noises, or difficulty stopping.
.Trained dealer technicians have
access to tools and equipment to
inspect the brakes and recommend
quality parts engineered for the
vehicle. Fluids
Proper fluid levels and approved fluids
protect the vehicle’s systems and
components. See
Recommended Fluids
and Lubricants 0389 for GM approved
fluids.
.Engine oil and windshield washer
fluid levels should be checked at
every fuel fill.
.Instrument cluster lights may come
on to indicate that fluids may be
low and need to be filled.
Hoses
Hoses transport fluids and should be
regularly inspected to ensure that
there are no cracks or leaks. With a
multi-point inspection, your dealer
can inspect the hoses and advise if
replacement is needed.
Lamps
Properly working headlamps,
taillamps, and brake lamps are
important to see and be seen on
the road.
.Signs that the headlamps need
attention include dimming, failure
to light, cracking, or damage. The brake lamps need to be checked
periodically to ensure that they light
when braking.
.With a multi-point inspection, your
dealer can check the lamps and
note any concerns.
Shocks and Struts
Shocks and struts help aid in control
for a smoother ride.
.Signs of wear may include steering
wheel vibration, bounce/sway while
braking, longer stopping distance,
or uneven tire wear.
.As part of the multi-point
inspection, trained dealer
technicians can visually inspect the
shocks and struts for signs of
leaking, blown seals, or damage, and
can advise when service is needed.
Tires
Tires need to be properly inflated,
rotated, and balanced. Maintaining
the tires can save money and fuel, and
can reduce the risk of tire failure.
.Signs that the tires need to be
replaced include three or more
visible treadwear indicators; cord or
fabric showing through the rubber;