Jeep Wrangler JK (2018 year). Instruction

— Engine Check/Malfunction Indicator Warning

Light (MIL)

The Engine Check/Malfunction Indicator Light (MIL) is a
part of an Onboard Diagnostic System called OBD II that
monitors engine and automatic transmission control sys-
tems. The light will illuminate when the ignition is in the
ON/RUN position before engine start. If the bulb does not
come on when turning the ignition switch from OFF to
ON/RUN, have the condition checked promptly.

Certain conditions, such as a loose or missing gas cap, poor
quality fuel, etc., may illuminate the light after engine start.
The vehicle should be serviced if the light stays on through
several typical driving styles. In most situations, the ve-
hicle will drive normally and will not require towing.

When the engine is running, the MIL may flash to alert
serious conditions that could lead to immediate loss of
power or severe catalytic converter damage. The vehicle
should be serviced as soon as possible if this occurs.

WARNING!

A malfunctioning catalytic converter, as referenced
above, can reach higher temperatures than in normal

(Continued)

WARNING! (Continued)

operating conditions. This can cause a fire if you drive
slowly or park over flammable substances such as dry
plants, wood, cardboard, etc. This could result in death
or serious injury to the driver, occupants or others.

CAUTION!

Prolonged driving with the Malfunction Indicator
Light (MIL) on could cause damage to the vehicle
control system. It also could affect fuel economy and
driveability. If the MIL is flashing, severe catalytic
converter damage and power loss will soon occur.
Immediate service is required.

— Tire Pressure Monitoring System (TPMS)

Warning Light

The warning light switches on and a message is displayed
to indicate that the tire pressure is lower than the recom-
mended value and/or that slow pressure loss is occurring.
In these cases, optimal tire duration and fuel consumption
may not be guaranteed.

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195

Should one or more tires be in the condition mentioned
above, the display will show the indications corresponding
to each tire in sequence.

CAUTION!

Do not continue driving with one or more flat tires as
handling may be compromised. Stop the vehicle,
avoiding sharp braking and steering. If a tire puncture
occurs, repair immediately using the dedicated tire
repair kit and contact your authorized dealer as soon as
possible.

Each tire, including the spare (if provided), should be
checked monthly when cold and inflated to the inflation
pressure recommended by the vehicle manufacturer on the
vehicle placard or tire inflation pressure label. (If your
vehicle has tires of a different size than the size indicated
on the vehicle placard or tire inflation pressure label, you
should determine the proper tire inflation pressure for
those tires.)

As an added safety feature, your vehicle has been
equipped with a tire pressure monitoring system (TPMS)
that illuminates a low tire pressure telltale when one or

more of your tires is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale illuminates, you
should stop and check your tires as soon as possible, and
inflate them to the proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire to overheat and
can lead to tire failure. Under-inflation also reduces fuel
efficiency and tire tread life, and may affect the vehicle’s
handling and stopping ability.

Please note that the TPMS is not a substitute for proper tire
maintenance, and it is the driver’s responsibility to main-
tain correct tire pressure, even if under-inflation has not
reached the level to trigger illumination of the TPMS low
tire pressure telltale.

Your vehicle has also been equipped with a TPMS malfunc-
tion indicator to indicate when the system is not operating
properly. The TPMS malfunction indicator is combined
with the low tire pressure telltale. When the system detects
a malfunction, the telltale will flash for approximately one
minute and then remain continuously illuminated. This
sequence will continue upon subsequent vehicle start-ups
as long as the malfunction exists. When the malfunction
indicator is illuminated, the system may not be able to
detect or signal low tire pressure as intended. TPMS
malfunctions may occur for a variety of reasons, including

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GETTING TO KNOW YOUR INSTRUMENT PANEL

the installation of replacement or alternate tires or wheels
on the vehicle that prevent the TPMS from functioning
properly. Always check the TPMS malfunction telltale after
replacing one or more tires or wheels on your vehicle to
ensure that the replacement or alternate tires and wheels
allow the TPMS to continue to function properly.

CAUTION!

The TPMS has been optimized for the original equip-
ment tires and wheels. TPMS pressures and warning
have been established for the tire size equipped on
your vehicle. Undesirable system operation or sensor
damage may result when using replacement equip-
ment that is not of the same size, type, and/or style.
Aftermarket wheels can cause sensor damage. Using
aftermarket tire sealants may cause the Tire Pressure
Monitoring System (TPMS) sensor to become inoper-
able. After using an aftermarket tire sealant it is
recommended that you take your vehicle to your au-
thorized dealer to have your sensor function checked.

— Electronic Stability Control (ESC) Active

Warning Light — If Equipped

This light will indicate when the Electronic Stability Con-
trol system is Active. The “ESC Indicator Light” in the

instrument cluster will come on when the ignition is placed
in the ON/RUN or ACC/ON/RUN position, and when
ESC is activated. It should go out with the engine running.
If the “ESC Indicator Light” comes on continuously with
the engine running, a malfunction has been detected in the
ESC system. If this light remains on after several ignition
cycles, and the vehicle has been driven several miles
(kilometers) at speeds greater than 30 mph (48 km/h), see
your authorized dealer as soon as possible to have the
problem diagnosed and corrected.
• The “ESC Off Indicator Light” and the “ESC Indicator

Light” come on momentarily each time the ignition is
placed in the ON/RUN or ACC/ON/RUN position.

• The ESC system will make buzzing or clicking sounds

when it is active. This is normal; the sounds will stop
when ESC becomes inactive.

• This light will come on when the vehicle is in an ESC

event.

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197

— Electronic Stability Control (ESC) Off Warning

Light — If Equipped

This light indicates the Electronic Stability Control (ESC) is
off.

Each time the ignition is turned to ON/RUN or ACC/ON/
RUN, the ESC system will be on, even if it was turned off
previously.

— Front Axle Lock Indicator Light — If Equipped

Indicates when the front axle lock has been activated.

— Rear Axle Lock Indicator Light — If Equipped

This light indicates when the rear axle lock has been
activated.

— 4WD Indicator Light — If Equipped

This light alerts the driver that the vehicle is in the
four-wheel drive mode, and the front and rear driveshafts
are mechanically locked together forcing the front and rear
wheels to rotate at the same speed.

— Sway Bar Indicator Light — If Equipped

This indicator will illuminate when the front sway bar is
disconnected.

Green Telltale Lights

— Front Fog Indicator Light — If Equipped

This indicator will illuminate when the front fog lights are
on.

— Turn Signal Indicator Lights

When the left or right turn signal is activated, the turn
signal indicator will flash independently and the corre-
sponding exterior turn signal lamps will flash. Turn signals
can be activated when the multifunction lever is moved
down (left) or up (right).

NOTE:
• A continuous chime will sound if the vehicle is driven

more than 1 mile (1.6 km) with either turn signal on.

• Check for an inoperative outside light bulb if either

indicator flashes at a rapid rate.

White Telltale Lights

— Cruise Indicator

This indicator shows that the Speed Control System is ON.

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GETTING TO KNOW YOUR INSTRUMENT PANEL

— Hill Descent Control (HDC) Indicator Light —

If Equipped

This indicator shows when the Hill Descent Control (HDC)
feature is turned on. The lamp will be on solid when HDC
is armed. HDC can only be armed when the transfer case is
in the “4WD LOW” position and the vehicle speed is less
then 30 mph (48 km/h). If these conditions are not met
while attempting to use the HDC feature, the HDC indi-
cator light will flash on/off.

Blue Telltale Lights

— High Beam Indicator Light

This indicator shows that the high beam headlights are on.
With the low beams activated, push the multifunction lever
forward (toward the front of the vehicle) to turn on the
high beams. Pull the multifunction lever rearward (toward
the rear of the vehicle) to turn off the high beams. If the
high beams are off, pull the lever toward you for a
temporary high beam on,

⬙flash to pass⬙ scenario.

ONBOARD DIAGNOSTIC SYSTEM — OBD II

Your vehicle is equipped with a sophisticated Onboard
Diagnostic system called OBD II. This system monitors the
performance of the emissions, engine, and automatic trans-
mission control systems. When these systems are operating
properly, your vehicle will provide excellent performance
and fuel economy, as well as engine emissions well within
current government regulations.

If any of these systems require service, the OBD II system
will turn on the Malfunction Indicator Light (MIL). It will
also store diagnostic codes and other information to assist
your service technician in making repairs. Although your
vehicle will usually be drivable and not need towing, see
your authorized dealer for service as soon as possible.

CAUTION!

• Prolonged driving with the MIL on could cause

further damage to the emission control system. It
could also affect fuel economy and driveability. The
vehicle must be serviced before any emissions tests
can be performed.

(Continued)

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199

CAUTION! (Continued)

• If the MIL is flashing while the vehicle is running,

severe catalytic converter damage and power loss
will soon occur. Immediate service is required.

Onboard Diagnostic System (OBD II) Cybersecurity

Your vehicle is required to have an Onboard Diagnostic
system (OBD II) and a connection port to allow access to
information related to the performance of your emissions
controls. Authorized service technicians may need to ac-
cess this information to assist with the diagnosis and
service of your vehicle and emissions system.

WARNING!

• ONLY an authorized service technician should con-

nect equipment to the OBD II connection port in
order to diagnose or service your vehicle.

• If unauthorized equipment is connected to the OBD

II connection port, such as a driver-behavior tracking
device, it may:

• Be possible that vehicle systems, including safety

related systems, could be impaired or a loss of

(Continued)

WARNING! (Continued)

vehicle control could occur that may result in an
accident involving serious injury or death.

• Access, or allow others to access, information

stored in your vehicle systems, including personal
information.

For further information, refer to “Cybersecurity” in “Mul-
timedia”.

Loose Fuel Filler Cap Message

After fuel is added, the vehicle diagnostic system can
determine if the fuel filler cap is possibly loose, improperly
installed, or damaged. A “gASCAP” message will be
displayed in the odometer. Tighten the gas cap until a

⬙clicking⬙ sound is heard. This is an indication that the gas
cap is properly tightened. Push the odometer reset button
to turn the message off. If the problem persists, the
message will appear the next time the vehicle is started.
This might indicate a damaged cap. If the problem is
detected twice in a row, the system will turn on the MIL.
Resolving the problem will turn the MIL off.

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GETTING TO KNOW YOUR INSTRUMENT PANEL

EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS

In some localities, it may be a legal requirement to pass an
inspection of your vehicle’s emissions control system.
Failure to pass could prevent vehicle registration.

For states that require an Inspection and Mainte-
nance (I/M), this check verifies the “Malfunction
Indicator Light (MIL)” is functioning and is not on

when the engine is running, and that the OBD II system is
ready for testing.

Normally, the OBD II system will be ready. The OBD II
system may not be ready if your vehicle was recently
serviced, recently had a dead battery or a battery replace-
ment. If the OBD II system should be determined not ready
for the I/M test, your vehicle may fail the test.

Your vehicle has a simple ignition actuated test, which you
can use prior to going to the test station. To check if your
vehicle’s OBD II system is ready, you must do the follow-
ing:

1. Cycle the ignition switch to the ON position, but do not

crank or start the engine.

NOTE:

If you crank or start the engine, you will have to

start this test over.

2. As soon as you cycle the ignition switch to the ON

position, you will see the “Malfunction Indicator Light
(MIL)” symbol come on as part of a normal bulb check.

3. Approximately 15 seconds later, one of two things will

happen:

• The MIL will flash for about ten seconds and then return

to being fully illuminated until you turn OFF the igni-
tion or start the engine. This means that your vehicle’s
OBD II system is not ready and you should not proceed
to the I/M station.

• The MIL will not flash at all and will remain fully

illuminated until you place the ignition in the off posi-
tion or start the engine. This means that your vehicle’s
OBD II system is ready and you can proceed to the I/M
station.

If your OBD II system is not ready, you should see your
authorized dealer or repair facility. If your vehicle was
recently serviced or had a battery failure or replacement,
you may need to do nothing more than drive your vehicle
as you normally would in order for your OBD II system to
update. A recheck with the above test routine may then
indicate that the system is now ready.

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201

SAFETY FEATURES

Anti-Lock Brake System (ABS)

The Anti-Lock Brake System (ABS) provides increased
vehicle stability and brake performance under most brak-
ing conditions. The system automatically prevents wheel
lock, and enhances vehicle control during braking.

The ABS performs a self-check cycle to ensure that the ABS
is working properly each time the vehicle is started and
driven. During this self-check, you may hear a slight
clicking sound as well as some related motor noises.

ABS is activated during braking when the system detects
one or more wheels begin to lock. Road conditions such as
ice, snow, gravel, bumps, railroad tracks, loose debris, or
panic stops may increase the likelihood of ABS activa-
tion(s).

You also may experience the following when ABS activates:
• The ABS motor noise (it may continue to run for a short

time after the stop).

• The clicking sound of solenoid valves.
• Brake pedal pulsations.
• A slight drop of the brake pedal at the end of the stop.

These are all normal characteristics of ABS.

WARNING!

• The ABS contains sophisticated electronic equip-

ment that may be susceptible to interference caused
by improperly installed or high output radio trans-
mitting equipment. This interference can cause pos-
sible loss of anti-lock braking capability. Installation
of such equipment should be performed by qualified
professionals.

• Pumping of the Anti-Lock Brakes will diminish their

effectiveness and may lead to a collision. Pumping
makes the stopping distance longer. Just press firmly
on your brake pedal when you need to slow down or
stop.

• The ABS cannot prevent the natural laws of physics

from acting on the vehicle, nor can it increase brak-
ing or steering efficiency beyond that afforded by the
condition of the vehicle brakes and tires or the
traction afforded.

• The ABS cannot prevent collisions, including those

resulting from excessive speed in turns, following
another vehicle too closely, or hydroplaning.

(Continued)

204

SAFETY

WARNING! (Continued)

• The capabilities of an ABS equipped vehicle must

never be exploited in a reckless or dangerous manner
that could jeopardize the user’s safety or the safety of
others.

ABS is designed to function with the OEM tires. Modifica-
tion may result in degraded ABS performance.

Anti-Lock Brake Warning Light

The yellow “Anti-Lock Brake Warning Light” will turn on
when the ignition is turned to the ON/RUN mode and
may stay on for as long as four seconds.

If the “Anti-Lock Brake Warning Light” remains on or
comes on while driving, it indicates that the anti-lock
portion of the brake system is not functioning and that
service is required. However, the conventional brake sys-
tem will continue to operate normally if the “Brake System
Warning Light” is not on.

If the “Anti-Lock Brake Warning Light” is on, the brake
system should be serviced as soon as possible to restore the

benefits of anti-lock brakes. If the “Anti-Lock Brake Warn-
ing Light” does not come on when the ignition is turned to
the ON/RUN mode, have the light repaired as soon as
possible.

Electronic Brake Control System

Your vehicle is equipped with an advanced Electronic
Brake Control system (EBC). This system includes Elec-
tronic Brake Force Distribution (EBD), Brake Assist System
(BAS), Hill Start Assist (HSA), Traction Control System
(TCS), Electronic Stability Control (ESC), and Electronic
Roll Mitigation (ERM). These systems work together to
enhance both vehicle stability and control in various driv-
ing conditions.

Your vehicle may also be equipped with Trailer Sway
Control (TSC) and Hill Descent Control (HDC).

Electronic Brake Force Distribution (EBD)

This function manages the distribution of the braking
torque between the front and rear axles by limiting braking
pressure to the rear axle. This is done to prevent overslip of
the rear wheels to avoid vehicle instability, and to prevent
the rear axle from entering ABS before the front axle.

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205

Brake System Warning Light

The red “Brake System Warning Light” will turn on when
the ignition is turned to the ON/RUN mode and may stay
on for as long as four seconds.

If the “Brake System Warning Light” remains on or comes
on while driving, it indicates that the brake system is not
functioning properly and that immediate service is re-
quired. If the “Brake System Warning Light” does not come
on when the ignition is turned to the ON/RUN mode, have
the light repaired as soon as possible.

Brake Assist System (BAS)

The BAS is designed to optimize the vehicle’s braking
capability during emergency braking maneuvers. The sys-
tem detects an emergency braking situation by sensing the
rate and amount of brake application and then applies
optimum pressure to the brakes. This can help reduce
braking distances. The BAS complements the anti-lock
brake system (ABS). Applying the brakes very quickly
results in the best BAS assistance. To receive the benefit of
the system, you must apply continuous braking pressure
during the stopping sequence, (do not “pump” the brakes).
Do not reduce brake pedal pressure unless braking is no

longer desired. Once the brake pedal is released, the BAS is
deactivated.

WARNING!

The Brake Assist System (BAS) cannot prevent the
natural laws of physics from acting on the vehicle, nor
can it increase the traction afforded by prevailing road
conditions. BAS cannot prevent collisions, including
those resulting from excessive speed in turns, driving
on very slippery surfaces, or hydroplaning. The capa-
bilities of a BAS-equipped vehicle must never be
exploited in a reckless or dangerous manner, which
could jeopardize the user’s safety or the safety of
others.

Hill Start Assist (HSA)

The HSA system is designed to mitigate roll back from a
complete stop while on an incline. If the driver releases the
brake while stopped on an incline, HSA will continue to
hold the brake pressure for a short period. If the driver
does not apply the throttle before this time expires, the
system will release brake pressure and the vehicle will roll
down the hill as normal.

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SAFETY

The following conditions must be met in order for HSA to
activate:
• The feature must be enabled.
• The vehicle must be stopped.
• Park brake must be off.
• Driver door must be closed.
• The vehicle must be on a sufficient grade.
• The gear selection must match vehicle uphill direction

(i.e., vehicle facing uphill is in forward gear; vehicle
backing uphill is in REVERSE gear).

• HSA will work in REVERSE gear and all forward gears.

The system will not activate if the transmission is in
PARK or NEUTRAL. For vehicles equipped with a
manual transmission, if the clutch is pressed, HSA will
remain active.

WARNING!

There may be situations where the Hill Start Assist
(HSA) will not activate and slight rolling may occur,
such as on minor hills or with a loaded vehicle, or

(Continued)

WARNING! (Continued)

while pulling a trailer. HSA is not a substitute for
active driving involvement. It is always the driver’s
responsibility to be attentive to distance to other ve-
hicles, people, and objects, and most importantly brake
operation to ensure safe operation of the vehicle under
all road conditions. Your complete attention is always
required while driving to maintain safe control of your
vehicle. Failure to follow these warnings can result in
a collision or serious personal injury.

Disabling And Enabling HSA

This feature can be turned on or turned off. To change the
current setting using your instrument cluster display, refer
to “Instrument Cluster Display” in “Getting To Know Your
Instrument Panel” for further information.

For vehicles not equipped with an instrument cluster
display, perform the following steps:

1. Center the steering wheel (front wheels pointing

straight forward).

2. Shift the transmission into PARK.

3. Apply the parking brake.

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207

4. Start the engine.

5. Rotate the steering wheel slightly more than one-half

turn to the left.

6. Push the “ESC Off” button located in the lower switch

bank below the climate control four times within 20
seconds. The “ESC Off Indicator Light” should turn on
and turn off two times.

7. Rotate the steering wheel back to center and then an

additional slightly more than one-half turn to the right.

8. Turn the ignition to the OFF mode and then back to ON.

If the sequence was completed properly, the “ESC Off
Indicator Light” will blink several times to confirm HSA
is disabled.

9. Repeat these steps if you want to return this feature to

its previous setting.

Traction Control System (TCS)

This system monitors the amount of wheel spin of each of
the driven wheels. If wheel spin is detected, the TCS may
apply brake pressure to the spinning wheel(s) and/or
reduce engine power to provide enhanced acceleration and
stability. A feature of the TCS, Brake Limited Differential
(BLD), functions similar to a limited slip differential and

controls the wheel spin across a driven axle. If one wheel
on a driven axle is spinning faster than the other, the
system will apply the brake of the spinning wheel. This
will allow more engine torque to be applied to the wheel
that is not spinning. BLD may remain enabled even if TCS
and ESC are in a reduced mode.

Electronic Stability Control (ESC)

This system enhances directional control and stability of
the vehicle under various driving conditions. The ESC
corrects for over/under steering of the vehicle by applying
the brake of the appropriate wheel to assist in counteract-
ing the over/under steer condition. Engine power may also
be reduced to help the vehicle maintain the desired path.

ESC uses sensors in the vehicle to determine the vehicle
path intended by the driver and compares it to the actual
path of the vehicle. When the actual path does not match
the intended path, ESC applies the brake of the appropriate
wheel to assist in counteracting the oversteer or understeer
condition.
• Oversteer - when the vehicle is turning more than

appropriate for the steering wheel position.

• Understeer - when the vehicle is turning less than

appropriate for the steering wheel position.

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SAFETY

The “ESC Activation/Malfunction Indicator Light” (lo-
cated in the instrument cluster), starts to flash as soon as
the tires lose traction and the ESC system becomes active.
The “ESC Activation/Malfunction Indicator Light” also
flashes when TCS is active. If the “ESC Activation/
Malfunction Indicator Light” begins to flash during accel-
eration, ease up on the accelerator and apply as little
throttle as possible. Be sure to adapt your speed and
driving to the prevailing road conditions.

WARNING!

• Electronic Stability Control (ESC) cannot prevent the

natural laws of physics from acting on the vehicle,
nor can it increase the traction afforded by prevailing
road conditions. ESC cannot prevent accidents, in-
cluding those resulting from excessive speed in
turns, driving on very slippery surfaces, or hydro-
planing. ESC also cannot prevent accidents resulting
from loss of vehicle control due to inappropriate
driver input for the conditions. Only a safe, attentive,
and skillful driver can prevent accidents. The capa-
bilities of an ESC equipped vehicle must never be
exploited in a reckless or dangerous manner which

(Continued)

WARNING! (Continued)

could jeopardize the user’s safety or the safety of
others.

• Vehicle modifications, or failure to properly main-

tain your vehicle, may change the handling charac-
teristics of your vehicle, and may negatively affect
the performance of the ESC system. Changes to the
steering system, suspension, braking system, tire
type and size or wheel size may adversely affect ESC
performance. Improperly inflated and unevenly
worn tires may also degrade ESC performance. Any
vehicle modification or poor vehicle maintenance
that reduces the effectiveness of the ESC system can
increase the risk of loss of vehicle control, vehicle
rollover, personal injury and death.

The ESC system has three available operating modes in 4H
range. The system has one operating mode in 4L range.
Two-wheel drive vehicles and four-wheel drive vehicles in
2H range have two operating modes.

4H Range (4WD Models)

ESC On

This is the normal operating mode for ESC in 4H range.

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209

ESC Partial Off

This mode is entered by momentarily pushing the ESC
OFF switch. When in

⬙ESC Partial Off⬙ mode, the TCS

portion of ESC (except for the limited slip feature described
in the TCS section), has been disabled and the

⬙ESC Off

Indicator Light

⬙ will be illuminated.

This mode is intended to be used if the vehicle is in deep
snow, sand, or gravel conditions and more wheel spin than
ESC would normally allow is required to gain traction. To
turn ESC on again, momentarily push the ESC OFF switch.
This will restore the normal “ESC On” mode of operation.

NOTE:

To improve the vehicle’s traction when driving

with snow chains, or starting off in deep snow, sand, or
gravel, it may be desirable to switch to the

⬙ESC Partial Off⬙

mode by pushing the ESC OFF switch. Once the situation
requiring ESC to be switched to the

⬙ESC Partial Off⬙ mode

is overcome, turn ESC back on by momentarily pushing the
ESC OFF switch. This may be done while the vehicle is in
motion.

WARNING!

• When in ⴖESC Partial Offⴖ mode, the TCS function-

ality of ESC, (except for the limited slip feature
described in the TCS section), has been disabled and
the “ESC Off Indicator Light” will be illuminated.
When in

ⴖESC Partial Offⴖ mode, the engine power

reduction feature of TCS is disabled, and the en-
hanced vehicle stability offered by the ESC system is
reduced.

• Trailer Sway control (TSC) is disabled when the ESC

system is in the

ⴖESC Partial Offⴖ mode.

ESC Full Off

This mode is entered by pushing and holding the ESC OFF
switch for five seconds.

In the

⬙ESC Full Off⬙ mode, the engine torque reduction

and stability features are disabled. Therefore, the enhanced
vehicle stability offered by ESC is unavailable. In an
emergency evasive maneuver, the ESC system will not
engage to assist in maintaining stability. “ESC Full Off”
mode is intended for off-highway or off-road use only.

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SAFETY

Jeep Wrangler JK (2018 year). Instruction - part 13