2023 JEEP GLADIATOR service

376SERVICING AND MAINTENANCE
(Continued)
EXHAUST SYSTEM
The best protection against carbon monoxide entry
into the vehicle body is a properly maintained
engine exhaust system.
If you notice a change in the sound of the exhaust
system, or if the exhaust fumes can be detected
inside the vehicle, or when the underside or rear of
the vehicle is damaged, have an authorized
technician inspect the complete exhaust system
and adjacent body areas for broken, damaged,
deteriorated, or mispositioned parts. Open seams
or loose connections could permit exhaust fumes
to seep into the passenger compartment. In
addition, have the exhaust system inspected each
time the vehicle is raised for lubrication or oil
change. Replace as required. Under normal operating conditions, the catalytic
converter will not require maintenance. However, it
is important to keep the engine properly tuned to
ensure proper catalyst operation and prevent
possible catalyst damage.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being
assessed against you.
In unusual situations involving grossly
malfunctioning engine operation, a scorching odor
may suggest severe and abnormal catalyst
overheating. If this occurs, stop the vehicle, turn off
the engine and allow it to cool. Service, including a
tune-up to manufacturer's specifications, should
be obtained immediately.
To minimize the possibility of catalytic converter
damage:
Do not interrupt the ignition when the transmis
-
sion is in gear and the vehicle is in motion.
Do not try to start the vehicle by pushing or
towing the vehicle.
Do not idle the engine with any ignition compo -
nents disconnected or removed, such as when
diagnostic testing, or for prolonged periods
during very rough idle or malfunctioning oper -
ating conditions.
WARNING!
Exhaust gases can injure or kill. They contain
Carbon Monoxide (CO), which is colorless and
odorless. Breathing it can make you uncon -
scious and can eventually poison you. To
avoid breathing CO see Ú page 328.
A hot exhaust system can start a fire if you
park over materials that can burn, such as
grass or leaves, and those items that come
into contact with your exhaust system. Do not
park or operate your vehicle in areas where
your exhaust system can contact anything that
can burn.
CAUTION!
The catalytic converter requires the use of
unleaded fuel only. Leaded gasoline will
destroy the effectiveness of the catalyst as an
emissions control device, may seriously
reduce engine performance and cause
serious damage to the engine.
Damage to the catalytic converter can result if
your vehicle is not kept in proper operating
condition. In the event of engine malfunction,
particularly involving engine misfire or other
apparent loss of performance, have your
vehicle serviced promptly. Continued opera -
tion of your vehicle with a severe malfunction
could cause the converter to overheat,
resulting in possible damage to the converter
and vehicle.
WARNING!

23_JT_OM_EN_USC_t.book Page 376

SERVICING AND MAINTENANCE379
Coolant Level
The coolant bottle provides a quick visual method
for determining that the coolant level is adequate.
With the engine in the off and cold, the level of the
engine coolant (antifreeze) in the bottle should be
between the ranges indicated on the bottle.
The radiator normally remains completely full, so
there is no need to remove the radiator/coolant
pressure cap unless checking for engine coolant
freeze point or replacing coolant. Advise your
service attendant of this. As long as the engine
operating temperature is satisfactory, the coolant
only needs to be checked once a month.
When additional engine coolant is needed to
maintain the proper level, only OAT coolant that
meets the requirements of FCA Material Standard
MS.90032 should be added to the coolant bottle.
Do not overfill.
Cooling System Notes
NOTE:When the vehicle is stopped after a few miles/kilo -
meters of operation, you may observe vapor
coming from the front of the engine compartment.
This is normally a result of moisture from rain,
snow, or high humidity accumulating on the
radiator and being vaporized when the thermostat
opens, allowing hot engine coolant (antifreeze) to
enter the radiator. If an examination of your engine compartment
shows no evidence of radiator or hose leaks, the
vehicle may be safely driven. The vapor will soon
dissipate.
Do not overfill the coolant expansion bottle.
Check the freezing point of the coolant in the
radiator and in the coolant expansion bottle. If
determined that more engine coolant needs to
be added to the radiator, the contents of the
coolant expansion bottle must also be protected
against freezing.
If frequent engine coolant additions are
required, the cooling system should be pressure
tested for leaks.
Maintain engine coolant concentration at a
minimum of 50% OAT coolant (conforming to
MS.90032) and distilled water for proper corro
-
sion protection of your engine which contains
aluminum components.
Make sure that the coolant expansion bottle
overflow hoses are not kinked or obstructed.
Keep the front of the radiator clean. With air
conditioning, keep the front of the condenser
clean.
Do not change the thermostat for Summer or
Winter operation. If replacement is ever neces -
sary, install ONLY the correct type thermostat. Other designs may result in unsatisfactory
engine system performance, poor gas mileage,
and increased emissions.
CHARGE AIR COOLER — INTER-COOLER
(D
IESEL ENGINE)
The charge air cooler is positioned in front of the
radiator and the air conditioner condenser. Air
enters the engine through the air cleaner and
passes through the turbocharger, where it is
pressurized. This pressurized air rapidly reaches
high temperature. The air is then directed through
a hose to the charge air cooler and through
another hose to the intake manifold of the engine.
This cooling process enables more efficient
burning of fuel resulting in fewer emissions.
To guarantee optimum performance of the system,
keep the surfaces of the charge air cooler,
condenser and radiator clean and free of debris.
Periodically check the hoses leading to and from
the charge air cooler for cracks or loose clamps
resulting in loss of pressure and reduced engine
performance.
8

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380SERVICING AND MAINTENANCE
(Continued)
BRAKE SYSTEM
In order to ensure brake system performance, all
brake system components should be inspected
periodically. For the proper maintenance intervals
Úpage 354.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should be
checked whenever the vehicle is serviced, or
immediately if the Brake System Warning Light is
on. If necessary, add fluid to bring level within the
designated marks on the side of the reservoir of
the brake master cylinder. Be sure to clean the top
of the master cylinder area before removing cap.
With disc brakes, fluid level can be expected to fall
as the brake pads wear. Brake fluid level should be
checked when pads are replaced. If the brake fluid
is abnormally low, check the system for leaks.
For further information Ú page 426.
FRONT/REAR AXLE FLUID
For normal service, periodic fluid level checks are
not required. When the vehicle is serviced for other
reasons the exterior surfaces of the axle assembly
should be inspected. If gear oil leakage is
suspected, inspect the fluid level.
Fluid Level Check
Lubricant should be approximately 1/8 inch
(3 mm) below the bottom edge of the oil fill hole.
NOTE:Make sure that the vehicle is level and supported
by the axles.
Adding Fluid
Add lubricant only at the fill hole and only to the
level specified above.
Selection Of Lubricant
Use only the manufacturer’s recommended fluid
Úpage 426.
WARNING!
Riding the brakes can lead to brake failure and
possibly a collision. Driving with your foot resting
or riding on the brake pedal can result in
abnormally high brake temperatures, excessive
lining wear, and possible brake damage. You
would not have your full braking capacity in an
emergency.
WARNING!
Use only manufacturer recommended brake
fluid Ú page 426. Using the wrong type of
brake fluid can severely damage your brake
system and/or impair its performance. The
proper type of brake fluid for your vehicle is
also identified on the original factory installed
hydraulic master cylinder reservoir.
To avoid contamination from foreign matter or
moisture, use only new brake fluid or fluid that
has been in a tightly closed container. Keep
the master cylinder reservoir cap secured at
all times. Brake fluid in a open container
absorbs moisture from the air resulting in a
lower boiling point. This may cause it to boil
unexpectedly during hard or prolonged
braking, resulting in sudden brake failure. This
could result in a collision.
Overfilling the brake fluid reservoir can result
in spilling brake fluid on hot engine parts,
causing the brake fluid to catch fire. Brake
fluid can also damage painted and vinyl
surfaces, care should be taken to avoid its
contact with these surfaces.
Do not allow petroleum based fluid to contam -
inate the brake fluid. Brake seal components
could be damaged, causing partial or
complete brake failure. This could result in a
collision.
WARNING!

23_JT_OM_EN_USC_t.book Page 380

382SERVICING AND MAINTENANCE
(Continued)
Fluid Level Check
The fluid level is preset at the factory and does not
require adjustment under normal operating
conditions. Routine fluid level checks are not
required; therefore the transmission has no
dipstick. An authorized dealer can check your
transmission fluid level using special service tools.
If you notice fluid leakage or transmission
malfunction, visit an authorized dealer
immediately to have the transmission fluid level
checked. Operating the vehicle with an improper
fluid level can cause severe transmission damage.
Fluid And Filter Changes
Under normal operating conditions, the fluid
installed at the factory will provide satisfactory
lubrication for the life of the vehicle.Routine fluid and filter changes are not required.
However, change the fluid and filter if the fluid
becomes contaminated (with water, etc.), or if the
transmission is disassembled for any reason.
Selection Of Lubricant
It is important to use the proper transmission fluid
to ensure optimum transmission performance and
life. Use only manufacturer's specified
transmission fluid Ú
page 426. It is important to
maintain the transmission fluid at the correct level
using the recommended fluid.
NOTE:No chemical flushes should be used in any trans -
mission; only the approved lubricant should be
used.
FUSES
General Information
CAUTION!
If a transmission fluid leak occurs, visit an
authorized dealer immediately. Severe transmis -
sion damage may occur. An authorized dealer
has the proper tools to adjust the fluid level
accurately.
CAUTION!
Using a transmission fluid other than
manufacturer’s recommended fluid may cause
deterioration in transmission shift quality and/or
torque converter shudder Ú page 426.
WARNING!
When replacing a blown fuse, always use an
appropriate replacement fuse with the same
amp rating as the original fuse. Never replace
a fuse with another fuse of higher amp rating.
The use of a fuse with a rating other than indi -
cated may result in a dangerous electrical
system overload. If a properly rated fuse
continues to blow, it indicates a problem in the
circuit that must be corrected. Never replace a
blown fuse with metal wires or any other mate -
rial. Failure to use proper fuses may result in
serious personal injury, fire and/or property
damage.
Before replacing a fuse, make sure that the
ignition is off and that all the other services
are switched off and/or disengaged.
If the replaced fuse blows again, contact an
authorized dealer.

23_JT_OM_EN_USC_t.book Page 382

SERVICING AND MAINTENANCE383
The fuses protect electrical systems against
excessive electrical current.
When a device does not work, you must check the
fuse element inside the blade fuse for a break/
melt.
Also, please be aware that when using power
outlets for an extended period of time with the
engine off, it may result in vehicle battery
discharge.
Blade Fuses

Power Distribution Center (PDC)
The Power Distribution Center is located in the
engine compartment near the battery. This center
contains cartridge fuses, mini fuses, and relays.
The PDC top cover is labeled with each serviceable
fuse/relay location, function, and size.If a general protection fuse for safety systems
(air bag system, braking system), power unit
systems (engine system, gearbox system) or
steering system blows, contact an authorized
dealer.
WARNING!
1 — Fuse Element
2 — Blade Fuse with a good/functional fuse
element
3 — Blade fuse with a bad/not functional fuse
element (blown fuse)
CAUTION!
When installing the power distribution center
cover, it is important to ensure the cover is
properly positioned and fully latched. Failure to
do so may allow water to get into the power
distribution center and possibly result in an
electrical system failure.
8

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SERVICING AND MAINTENANCE393
Bulb Replacement
NOTE:Lens fogging can occur under certain atmospheric
conditions. This will usually clear as atmospheric
conditions occur to allow the condensation to
change back into a vapor. Turning the lamps on will
usually accelerate the clearing process.
HALOGEN HEADLAMPS — IF EQUIPPED
See the following steps to replace:

1. Open hood and support using prop rod.

2. Remove the front grille. Turn the retainers
along the top a quarter turn counterclockwise
and remove.
3. Pull the bottom of the grille away, starting at one side and working toward the other. 4. Remove the three screws holding the
headlamp to the vehicle.
5. Remove lamp from the vehicle.
6. Remove the lamp from the collar.
7. Grab the bulb and turn a quarter turn counter -
clockwise.
8. Pull the bulb from the housing.
9. Push connector locking tab to the unlock position.
Base Fog Lamps
PSX24W
Premium Fog Lamps LED
Rear Premium LED Tail Lamps LED
Rear Base Tail Lamp Stop/Tail/Turn Bulb 3157
Rear Base Tail Lamp Backup Bulb 7440
Rear Base Tail Lamp Side Marker LED
Center High Mounted Stop Lamp LED
License Lamp LED
NOTE: Numbers refer to commercial bulb types that can be purchased from an authorized dealer. If a bulb needs to be replaced, visit an authorized dealer or refer
to the applicable Service Manual.
Exterior Bulbs
Bulb Name Bulb Number
8

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394SERVICING AND MAINTENANCE
10. Remove connector from bulb.
11. Push connector onto new bulb base, and push the connector locking tab to the lock position.
12. Reinstall bulb housing. Rotate the bulb a quarter turn clockwise.
NOTE:We recommend seeing an authorized dealer for
service.
FRONT PARK/TURN SIGNAL
See the following steps to replace:

1. Remove the front wheel liner fasteners to access bulb sockets.
Wheel Liner

2. Turn the socket assembly a quarter turn counterclockwise and remove from housing.
Pull the bulb straight from the socket to
replace.
NOTE:We recommend seeing an authorized dealer for
service.
LED FRONT SIDE MARKER
See the following steps to replace:

1. Remove the front wheel liner fasteners to access side maker screw and electrical
connector.
2. Remove fastening screw in the back of the
front side maker assembly and disconnect
electrical connector.
3. Remove and replace LED front side marker light assembly.
FRONT FOG LAMP — IF EQUIPPED
See the following steps to replace:

1. Reach under the vehicle to access the back of the front fog lamp.

2. Disconnect the wire harness connector from the front fog lamp connector receptacle.
3. Firmly grab the bulb by the two latch features and squeeze them together to unlock the bulb
from the back of the front fog lamp housing.
4. Pull the bulb straight out from the keyed opening in the housing and then connect the
replacement bulb.CAUTION!
Do not touch the new bulb with your fingers. Oil
contamination will severely shorten bulb life. If
the bulb comes in contact with any oily surface,
clean the bulb with rubbing alcohol.
CAUTION!
Do not touch the new bulb with your fingers. Oil
contamination will severely shorten bulb life. If
the bulb comes in contact with any oily surface,
clean the bulb with rubbing alcohol.

23_JT_OM_EN_USC_t.book Page 394

SERVICING AND MAINTENANCE395
LED Front Fog Lamp
If your vehicle is equipped with LED fog lamps they
are replaced as an assembly.
NOTE:We recommend seeing an authorized dealer for
service.
REAR TAIL, STOP, TURN SIGNAL, AND BACKUP
LAMP — IF EQUIPPED
See the following steps to replace:

1. Remove the two screws that pass through the bed sheet metal.

Tail Lamp Screws
2. Pull the outboard side of the lamp rearward,
far enough to unsnap the two receptacles on
the outboard side of the lamp housing, from
the two plastic snap post retainers in the outer
box side panel.
3. Once removed, locate and rotate the appropriate socket a quarter turn counter -
clockwise, then remove it from the housing.
4. Pull the bulb straight from the socket to replace.
5. To install a new bulb, reverse the procedure above.
CENTER HIGH MOUNTED STOP LAMP (CHMSL)
The stop lamp is mounted on the tailgate. If service
is needed, obtain the LED assembly from an
authorized dealer.
LICENSE PLATE LAMPS — IF EQUIPPED
NOTE:
To install a new bulb, reverse the procedure above.
When installing the new bulb, care should be taken
to not allow bare skin to come in contact with the
bulb.
See an authorized dealer to replace LED lamps.
TIRES
TIRE SAFETY INFORMATION
Tire safety information will cover aspects of the
following information: Tire Markings, Tire
Identification Numbers, Tire Terminology and
Definitions, Tire Pressures, and Tire Loading.
NOTE:If your vehicle is equipped with bead-lock wheels,
please refer to your vehicles bead-lock specific
part number for additional information and instruc -
tions on mopar.com or by contacting an authorized
dealer.
CAUTION!
Do not touch the new bulb with your fingers.
Oil contamination will severely shorten bulb
life. If the bulb comes in contact with any oily
surface, clean the bulb with rubbing alcohol.
Always use the correct bulb size and type for
replacement. An incorrect bulb size or type
may overheat and cause damage to the lamp,
the socket or the lamp wiring.8

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