2023 HYUNDAI SONATA engine

04
4-11
Warning and Indicator Lights
Information
Make sure that all warning lights are OFF
after starting the engine. If any light is still ON, this indicates a situation that needs attention.
Air Bag Warning Light
This warning light illuminates:
• When you place the ignition switch to the ON position.
- The air bag warning light illuminates for about 6 seconds and then turns
off when all checks have been
performed
• The air bag warning light will remain
illuminated if there is a malfunction
with the Safety Restraint System (SRS)
air bag operation.
In this case, have the vehicle
inspected by an authorized HYUNDAI
dealer.
Seat Belt Warning Light
This warning light informs the driver that
the seat belt is not fastened.
For more information, refer to “Seat
Belts” in chapter 3. Parking Brake & Brake Fluid
Warning Light
This warning light illuminates:
•
When you place the ignition switch to the ON position.
- The parking brake light illuminates for about 3 seconds and will then
turn off once the parking brake is
released.
• Whenever the parking brake is applied.
• Whenever the brake fluid level in the
reservoir is low.
- If the warning light illuminates with the parking brake released, it
indicates that the brake fluid level in
the reservoir is low.
If the brake fluid level in the reservoir is low:
1. Drive carefully to the nearest safe location and stop your vehicle.
2. With the engine stopped, check the brake fluid level immediately
and add fluid as required (For more
information, refer to "Brake Fluid" in
chapter 8) . After adding brake fluid,
check all brake components for fluid
leaks. If a brake fluid leak is found, or
if the warning light remains on, or if
the brakes do not operate properly, do
not drive the vehicle. Have the vehicle
inspected by an authorized HYUNDAI
dealer.

Instrument Cluster
4-12
Dual-diagonal braking system
Your vehicle is equipped with dual-
diagonal braking systems. This means
you still have braking on two wheels even
if one of the dual systems should fail.
With only one of the dual systems
working, more than normal pedal travel
and greater pedal pressure is required to
stop the vehicle.
If the brakes fail while you are driving,
shift to a lower gear for additional engine
braking and stop the vehicle as soon as it
is safe to do so.
WARNING
Parking Brake & Brake Fluid Warning
Light
Driving the vehicle with a warning light
ON is dangerous. If the Parking Brake &
Brake Fluid Warning Light illuminates
with the parking brake released, it
indicates that the brake fluid level is
low.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer. Anti-lock Brake System (ABS)
Warning Light
This warning light illuminates:
•
When you place the ignition switch to the ON position.
- The ABS warning light illuminates for about 3 seconds and then turns
off.
• Whenever there is a malfunction with the ABS.
Note that the hydraulic braking
system will still be operational even if
there is a malfunction with the ABS.
Electronic Brake Force
Distribution (EBD) System
Warning Light
These two warning lights illuminate at the same time while driving:
When the ABS and regular brake system
may not work normally.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer.
WARNING
Electronic Brake Force Distribution
(EBD) System Warning Light
When both ABS and Parking Brake &
Brake Fluid Warning Lights are on, the
brake system will not work normally
and you may experience an unexpected
and dangerous situation during sudden
braking.
In this case, avoid high speed driving
and abrupt braking.
Have the vehicle inspected by an
authorized HYUNDAI dealer as soon as possible.

04
4-13
Information - Electronic Brake Force Distribution (EBD)
System Warning Light
When the ABS Warning Light is on
or both ABS and Parking Brake &
Brake Fluid Warning Lights are on, the
speedometer, odometer, or tripmeter may
not work. Also, the EPS Warning Light may illuminate and the steering effort may
increase or decrease. In this case, have the vehicle inspected by
an authorized HYUNDAI dealer as soon as possible.
Electronic Parking Brake
(EPB) Warning Light EPB
This warning light illuminates:
• When you place the Engine Start/Stop
button to the ON position.
- The EPB warning light illuminates for approximately 3 seconds and
then turns off.
• Whenever there is a malfunction with the EPB.
If this occurs, have the vehicle
inspected by an authorized HYUNDAI
dealer.
Information
The Electronic Parking Brake (EPB)
Warning Light may illuminate when
the Electronic Stability control (ESC)
Indicator Light comes on to indicates that
the ESC is not working properly (This does not indicate malfunction of the EPB). AUTO HOLD Indicator Light (if equipped)
This indicator light illuminates:
•
[White] When you activate the auto
hold system by pressing the AUTO
HOLD button.
• [Green] When you stop the vehicle
completely by depressing the brake
pedal with the auto hold system
activated.
• [Yellow] When there is a malfunction
with the auto hold system.
In this case, have the vehicle
inspected by an authorized HYUNDAI
dealer.
For more information, refer to “Auto
Hold” in chapter 6.
Electric Power Steering (EPS)
Warning Light
This warning light illuminates:
• When you place the ignition switch to the ON position.
- The Electric Power Steering Warning
light illuminates for about 3 seconds
and then goes off.
• Whenever there is a malfunction with the EPS.
If this occurs, have the vehicle
inspected by an authorized HYUNDAI
dealer.

Instrument Cluster
4-14
Malfunction Indicator Lamp (MIL)
This warning light illuminates:
• When you place the ignition switch to the ON position.
- The malfunction indicator light illuminates for about 3 seconds and
then goes off.
• Whenever there is a malfunction with
either the emission control system or
the engine or the vehicle powertrain.
If this occurs, have the vehicle
inspected by an authorized HYUNDAI
dealer.
NOTICE
• Driving with the Malfunction
Indicator Lamp (MIL) on may cause
damage to the emission control
system which could affect drivability
and/or fuel economy.
• If the enhanced engine protection
system becomes activated due to
lack of engine oil, engine power
will be limited. If such condition
continues repeatedly, the
Malfunction Indicator Lamp will
illuminate.
NOTICE
If the Malfunction Indicator Lamp
(MIL) illuminates, potential catalytic
converter damage is possible which
could result in loss of engine power.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer as soon as possible. Charging System Warning
Light
When this warning light illuminates while
the engine is running, the battery is not
being charged. Immediately turn OFF
all electrical accessories. Try not to use
electrically operated controls, such as
the power windows. Keep the engine running.
Have the vehicle inspected by an
authorized HYUNDAI dealer as soon as possible.
Engine Oil Pressure Warning
Light
This warning light illuminates:
When the engine oil pressure is low.
If the oil pressure is lowered due to
the lack of engine oil, the oil pressure
warning light turns on and the enhanced
engine protection system that limits the
engine output starts to work.
1. Drive carefully to the nearest safe
location and stop your vehicle.
2. Turn the engine off and check the engine oil level (For more
information, refer to "Engine Oil" in
chapter 8) . If the level is low, add oil
as required.
If the warning light remains on after
adding oil or if oil is not available, have
the vehicle inspected by an authorized
HYUNDAI dealer as soon as possible.
According to circumstances, the oil
pressure warning light turns off and
the output limitation is released. Even
so, you should check the engine in a
safe place. Continued driving with the
warning light on may cause engine
failure.

04
4-15
Information
When engine oil pressure decreases due to insufficient engine oil, etc., the Engine Oil
Pressure warning light will illuminate. In
addition, the enhanced engine protection
system which limits engine power will
be activated. If the engine oil pressure is
restored, the Engine Oil Pressure warning
light and the enhanced engine protection
system will turn off. However, for gasoline 2.5 turbo engine, when the engine oil
pressure is restored, the warning light and
the enhanced engine protection system will
turn off after the engine is restarted.
NOTICE
• If the engine is not turned OFF
immediately after the Engine
Oil Pressure Warning Light is
illuminated, severe damage could
occur.
• If the warning light stays on while the
engine is running, it indicates that
there may be serious engine damage or malfunction. In this case:
1. Stop the vehicle as soon as it is safe to do so.
2. Turn off the engine and check the oil level. If the oil level is low, fill
the engine oil to the proper level.
3. Start the engine again. If the warning light stays on after the
engine has started, turn the
engine off immediately. In this
case, have the vehicle inspected
by an authorized HYUNDAI dealer.
Low Fuel Level Warning Light
This warning light illuminates:
When the fuel tank is nearly empty. Add fuel as soon as possible.
NOTICE
Driving with the Low Fuel Level warning
light on or with the fuel level below "E"
can cause the engine to misfire and
damage the catalytic converter.
Master Warning Light
This indicator light illuminates:
When there is a malfunction in operation
in any of the following systems:
- Forward Collision-Avoidance Assist system malfunction (if equipped)
- Forward Collision-Avoidance Assist radar blocked (if equipped)
- Blind-Spot Collision Warning system malfunction (if equipped)
- Blind-Spot Collision Warning radar blocked (if equipped)
- High Beam Assist malfunction (if equipped)
- Lamp malfunction (if equipped)
- Smart Cruise Control malfunction (if equipped)
- Tire Pressure Monitoring System (TPMS) malfunction (if equipped)
To identify the details of the warning,
look at the LCD display.

04
4-17
Immobilizer Indicator Light
This indicator light illuminates:
•
When the vehicle detects the
immobilizer in the key with the
ignition switch in the ON position.
- At this time, you can start the engine.
- The indicator light goes off after starting the engine.
This indicator light blinks:
• When there is a malfunction with the
immobilizer system.
If this occurs, have the vehicle inspected
by an authorized HYUNDAI dealer.
Immobilizer Indicator Light
(with smart key) (if equipped)
This indicator light illuminates for up to 30 seconds:
When the vehicle detects the smart key
in the vehicle with the Engine Start/Stop
button in the ACC or ON position. - Once the smart key is detected, you can start the engine.
- The indicator light goes off after starting the engine.
This indicator light blinks for a few seconds:
When the smart key is not in the vehicle.
- If the smart key is not detected, you cannot start the engine.
This indicator light illuminates for 2 seconds and goes off:
If the smart key is in the vehicle and the
Engine Start/Stop button is ON, but the
vehicle cannot detect the smart key.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer.
This indicator light blinks:
When there is a malfunction with the
immobilizer system.
In this case, have the vehicle inspected
by an authorized HYUNDAI dealer.
Turn Signal Indicator Light
This indicator light blinks:
When you operate the turn signal
indicator stalk.
If any of the following occur, there may be
a malfunction with the turn signal system.
- The turn signal indicator light illuminates but does not blink
- The turn signal indicator light blinks rapidly
- The turn signal indicator light does not illuminate at all
If any of these conditions occur, have
your vehicle inspected by an authorized
HYUNDAI dealer.
Headlamp Warning Light (if equipped)
This warning light illuminates:
If one of the exterior bulbs (headlamp,
stop lamp, high mounted stop lamp) is
not operating properly. One of the bulbs
may need to be replaced. If the vehicle
is equipped with LED headlamps, have
the vehicle inspected by an authorized
HYUNDAI dealer.
Information
When replacing the bulb, use the same wattage bulb.
For more information, refer to "Light
bulbs" in chapter 8.

Instrument Cluster
4-18
High Beam Indicator Light
This indicator light illuminates:
•
When the headlights are on and in the high beam position.
• When the turn signal lever is pulled
into the Flash-to-Pass position.
Light ON Indicator Light
This indicator light illuminates:
When the tail lights or headlamps are on.
High Beam Assist indicator
light (if equipped)
This indicator light illuminates:
• When the High Beam is on with the
light switch in the AUTO light position.
• If your vehicle detects oncoming or
preceding vehicles, High Beam Assist
will switch the high beam to low beam
automatically.
For more information, refer to "High
Beam Assist (HBA)" in chapter 5. Forward Collision-Avoidance
Assist Warning Light (if equipped)
This warning light illuminates:
•
When you set the ignition switch or
Engine Start/Stop button to the ON position.
- It illuminates for approximately 3 seconds and then goes off.
• When there is a malfunction with
FCA. In this case, have your vehicle
inspected by an authorized dealer of
HYUNDAI.
For more information, refer to "Forward
Collision-Avoidance Assist (FCA)" in
chapter 6.
Lane Keeping Assist
Indicator Light (if equipped)
This indicator light illuminates:
• [Green] When you activate the lane
departure warning system by pressing
the LKA button and all of the system
operating conditions are satisfied.
• [White] When system operating
conditions are not satisfied or when
the sensor does not detect the lane line.
• [Yellow] When there is a malfunction
with Lane Keeping Assist system.
In this case, have your vehicle inspected
by an authorized HYUNDAI dealer.
For more information, refer to "Lane
Keeping Assist (LKA)" in chapter 6.

04
4-19
LCD Display Messages
Shift to P or N to start engine
(for smart key system)
This warning message is displayed if
you try to start the engine with the shift
button not in the P (Park) or N (Neutral) position.
Information
You can start the engine with the shift
button in the N (Neutral) position. But, for
your safety, we recommend that you start
the engine with the shift button in the P (Park) position.
Shift to P (for smart key system)
This message is displayed if you try to
turn off the engine without the shift
button in P (Park) position.
If this occurs, the Engine Start/Stop
button turns to the ACC position (If you
press the Engine Start/Stop button once
more, it will turn to the ON position).
Low key battery
(for smart key system)
This warning message is displayed if the
battery of the smart key is discharged
while changing the Engine Start/Stop
button to the OFF position.
Press brake pedal to start engine
(for smart key system)
This warning message is displayed if the
Engine Start/Stop button changes to
the ACC position twice by pressing the
button repeatedly without depressing
the brake pedal.
You can start the vehicle by depressing
the brake pedal and then pressing the
Engine Start/Stop button. Key not in vehicle
(for smart key system)
This warning message is displayed if the
smart key is not in the vehicle when you
press the Engine Start/Stop button.
When attempting to start the vehicle,
always have the smart key with you.
Key not detected
(for smart key system)
This warning message is displayed if the
smart key is not detected when you press
the Engine Start/Stop button.
Press START button again
(for smart key system)
This message is displayed if you were
unable to start the vehicle when the
Engine Start/Stop button was pressed.
If this occurs, attempt to start the engine
by pressing the Engine Start/Stop button again.
If the warning message appears each
time you press the Engine Start/Stop
button, have your vehicle inspected by
an authorized HYUNDAI dealer.
Battery discharging due to external
electrical devices (if equipped)
This message is displayed if the battery
voltage is weak due to any non-factory
electrical accessories (ex. dashboard
camera) while parking. Be careful that
the battery is not discharged.
If the warning message appears after
removing the non-factory electrical
accessories, have the vehicle inspected
by an authorized HYUNDAI dealer.