check engine HYUNDAI TUCSON HYBRID 2023 Manual Online

Maintenance9-6
While operating your vehicle:
• Note any changes in the sound of the exhaust or any smell of exhaust fumes
in the vehicle.
• Check for vibrations in the steering wheel. Notice if there is any increased
steering effort or looseness in the
steering wheel, or change in its
straight-ahead position.
• Notice if your vehicle constantly turns slightly or “pulls” to one side when
traveling on smooth, level road.
• When stopping, listen and check for unusual sounds, pulling to one side,
increased brake pedal travel or “hard-
to-push” brake pedal.
• If any slipping or changes in the operation of your transmission occurs,
check the transmission fluid level.
• Check the automatic transmission P (Park) function.
• Check the parking brake.
• Check for fluid leaks under your vehicle (water dripping from the air
conditioning system during or after
use is normal).
At least monthly:
• Check coolant level in the engine coolant reservoir.
• Check the operation of all exterior lights, including the stoplights, turn
signals and hazard warning flashers.
• Check the inflation pressures of all tires including the spare for tires that
are worn, show uneven wear, or are
damaged.
• Check for loose wheel lug nuts.
At least twice a year:
• Check radiator, heater and air conditioning hoses for leaks or
damage.
• Check windshield washer spray and wiper operation. Clean wiper blades
with a clean cloth dampened with
washer fluid.
• Check headlight alignment.
• Check muffler, exhaust pipes, shields and clamps.
• Check the seat belts for wear and function.
At least once a year:
• Clean body and door drain holes.
• Lubricate door hinges and hood hinges.
• Lubricate door and hood locks and latches.
• Lubricate door rubber weather strips.
• Check the air conditioning system.
• Inspect and lubricate automatic transmission linkage and controls.
• Clean the battery and terminals. (For plug-in hybrid vehicle)
• Check the brake fluid level.

Maintenance9-8
Information
• It is normal for engine oil to be consumed during driving. The engine oil level should
be checked on regular basis.
• The engine oil change interval for normal operating conditions is based on the use of
the recommended engine oil specification in chapter 2. If the recommended engine
oil specification is not used, then replace the engine oil according to the maintenance
schedule under severe operating conditions.
• The vehicle may be equipped with the Oil Life Management System that predicts
engine oil life based on the driver’s driving history and alerts the driver to change
engine oil.
- If the deterioration of the engine oil increases depending on the driver’s driving
style, the remaining oil life alert will appear on the instrument cluster before the
normal engine oil replacement interval. Have the engine oil and filter changed by an
authorized HYUNDAI dealer.
- Oil Life Management System works when the recommended engine oil is used.
If the recommended engine oil is not used, replace the engine oil according to the
maintenance schedule under severe usage conditions. Also, check the engine oil level
regularly as this system assumes that the engine oil is being filled norm\
ally.
- Always reset the remaining engine oil life whenever the engine oil is changed.
Otherwise, the indication of remaining Oil life in the Oil Life Management System
may not be accurate.To reset the Oil Change Reminder, select ‘RESET’ from the
instrument cluster or infotainment system screen. Then, select ‘Yes’ when the
message “Reset oil life?” or “Has the engine oil been changed? Press [Yes] to reset
the oil life.” appears on the screen.
- If there is no alert until the maximum maintenance interval, have the vehicle
checked by an authorized HYUNDAI dealer.

09
9-9
The following maintenance services must be performed to ensure good emission control and performance.
Keep receipts for all vehicle emission services to protect your warranty. Where both mileage and time are shown, the frequency of
service is determined by whichever occurs first.
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Number of months or driving distance, whichever comes first
Months 12 24 36 48 60 72 84 96 108 120 132 144 156 168 180
Milesx1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 112 120
Kmx1,000 13 26 39 52 65 78 91 104 117 130 143 156 169 182 195
HSG belts
*1
Inspect every 8,000 miles (13,000 km) or 12 months.
Replace every 64,000 miles (104,000 km) or 48 months
Engine oil and engine oil filter
*2 *3
RRRRRRRRRRRRRRR
Fuel additives
*4
Add every 8,000 miles (13,000 km) or 12 months
Air cleaner filter I I R I I R I I R I I R I I R
Spark plugs Replace every 48,000 miles (78,000 km)
Rotate tires Rotate tires every 8,000 miles (13,000 km) or 12 months
Cabin air filter I R I R I R I R I R I R I R I
Engine coolant At first, replace at 120,000 miles (200,000 km) or 120 months.
After that, replace every 24,000 miles (40,000 km) or 24 months
Inverter coolant HEV
At first, replace at 120,000 miles (200,000 km) or 120 months.
After that, replace every 24,000 miles (40,000 km) or 24 months
PHEV Replace every 35,000 miles (60,000 km) or 36 months
Intercooler, in/out hose At first, inspect at 5,000 miles (8,000 km) or 6 months,
After that, inspect every 20,000 miles (32,000 km) or 24 months
I : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.*1 :
The drive belt should be replaced when cracks occur or tension is reduced excessively.
*2 :
Requires API SN PLUS (or above) grade engine oil. If a lower grade engine oil is used, then the engine oil and engine oil filter
must be replaced at every 5,000 miles (8,000 km) or 6 months as indicated for severe maintenance condition.
*3 :
As it is normal for engine oil to be consumed during driving, the amount of engine oil should be checked regularly.
*4 :
If TOP TIER Detergent Gasoline is not available, one bottle of additive is recommended. Additives are available from your
authorized HYUNDAI dealer along with information on how to use them. Do not mix other additives.
Normal Maintenance Schedule

Maintenance9-14
Engine Oil and Filter
The engine oil and filter should be
changed at the intervals specified in the
maintenance schedule. If the vehicle
is being driven in severe conditions,
more frequent oil and filter changes are
required.
HSG (Hybrid Starter & Generator)
Belt
The HSG belt should be changed at the
intervals specified in the maintenance
schedule.
Fuel Lines, Fuel Hoses and
Connections
Check the fuel lines, fuel hoses and
connections for leakage and damage.
Have an authorized HYUNDAI dealer
replace any damaged or leaking parts
immediately.
Fuel Filter
The fuel filter is considered to be
maintenance free but periodic inspection
is recommended for this maintenance
depends on fuel quality. If there are
some important matters like fuel flow
restriction, surging, loss of power, hard
starting problem etc., replace the fuel
filter immediately. Consult an authorized
HYUNDAI dealer for details.
Vapor Hose and Fuel Filler Cap
The vapor hose and fuel filler cap should
be inspected at those intervals specified
in the maintenance schedule. Your
HYUNDAI dealer will help to determine if
replacement is needed.
Air Cleaner Filter
A genuine HYUNDAI air cleaner filter
is recommended when the filter is
replaced.
Spark Plugs
Make sure to install new spark plugs of
the correct heat range.
When assembling parts, be sure to
wipe the inside and outside of the boot
bottom of the ignition coil and the
insulator of the spark plug with a soft
cloth to prevent contamination of the
spark plug insulator.
WARNING
Do not remove spark plugs from the
vehicle when the engine is hot. You
may damage the engine and may also
risk burn injury.
Cooling System
Check cooling system components, such
as radiator, coolant reservoir, hoses and
connections for leakage and damage.
Replace any damaged parts.
Engine Coolant/Inverter Coolant
The coolant should be changed at the
intervals specified in the maintenance
schedule.
Automatic Transmission Fluid
The automatic transmission fluid level
does not need to be checked under
normal usage conditions.
Have the automatic transmission fluid
changed by an authorized HYUNDAI
dealer according to the maintenance
schedule.
EXPLANATION OF SCHEDULED MAINTENANCE ITEMS

09
9-15
Brake Hoses and Lines
Visually check for proper installation,
chafing, cracks, deterioration and any
leakage. Replace any deteriorated or
damaged parts immediately.
Brake Fluid
Check the brake fluid level in the brake
fluid reservoir. The level should be
between the MIN and the MAX marks
on the side of the reservoir. Use only
hydraulic brake fluid conforming to DOT
4 specification.
Parking Brake
Inspect the parking brake system.
Brake Discs, Pads, Calipers and
Rotors
Check the pads for excessive wear, discs
for run out and wear, and calipers for
fluid leakage.
Exhaust Pipe and Muffler
Visually inspect the exhaust pipes,
muffler and hangers for cracks,
deterioration, or damage. Start
the engine and listen carefully for
any exhaust gas leakage. Tighten
connections or replace parts as
necessary.
Suspension Mounting Bolts
Check the suspension connections for
looseness or damage. Retighten to the
specified torque.
Steering Gear Box, Linkage &
Boots/Lower Arm Ball Joint
With the vehicle stopped and the hybrid
system off, check for excessive free-play
in the steering wheel. Check the linkage
for bends or damage. Check the dust
boots and ball joints for deterioration,
cracks, or damage.
Replace any damaged parts.
Air Conditioning Refrigerant
Check the air conditioning lines and
connections for leakage and damage.
Drive Shaft and Related
Check the drive shaft, boots, clamps,
rubber couplings and center-bearing
rubber for cracks, deterioration, or
damage. Replace any damaged parts
and if necessary, repack the grease.

Maintenance9-16
Checking the Engine Oil Level
Engine oil is used for lubricating,
cooling, and operating various hydraulic
components in the engine. Engine oil
consumption while driving is normal,
and it is necessary to check and refill the
engine oil regularly. Also, check and refill
the oil level within the recommended
maintenance schedule to prevent
deterioration of oil performance.
Check the engine oil following the below
procedure.
1. Follow all of the oil manufacturer’s precautions.
2. Be sure the vehicle is on the level ground in P (Park) with the parking
brake set and the wheels blocked.
3. Turn the engine on and warm the engine up until the coolant
temperature reaches a constant
normal temperature.
4. Turn the engine off, remove the oil filler cap and pull the dipstick out.
Wait for 15 minutes for the oil to return
to the oil pan.
5. Wipe the dipstick clean and re-insert it fully.
ONX4PH091002NONX4PH091002N
6. Pull the dipstick out again and check the level. The level should be between
F (Full) and L (Low).
ONX4H090020ONX4H090020
7. If the oil level is below L, add enough oil to bring the level to F.
Use only the specified engine oil (Refer
to “Recommended Lubricants and
Capacities” section in chapter 2).
NOTICE
To prevent damage to your engine:
• Do not overfill with engine oil. Add oil
in small quantities and recheck level
to ensure engine is not overfilled.
• The engine oil consumption may
increase while you break in a new
vehicle and it will be stabilized after
driving 4,000 miles (6,000 km).
• The engine oil consumption can be
affected by driving habits, climate
conditions, traffic conditions,
oil quality, etc. Therefore, it is
recommended that you inspect the
engine oil level regularly and refill it
if necessary.
ENGINE OIL

09
9-17
Checking the Engine Oil and
Filter
• The lubrication, rust prevention, cooling, and cleaning effect of the
engine oil will gradually degrade
during its use. Have the engine oil and
filter be changed by an authorized
HYUNDAI dealer according to the
Oil Life Management System or
the Maintenance Schedule at the
beginning of this chapter.
• If the maintenance schedule to replace engine oil is exceeded,
the engine oil performance may
deteriorate, and the engine condition
may be affected. Therefore, replace
the engine oil according to the
maintenance schedule.
• To keep the engine in optimal condition, use the recommended
engine oil and filter. If the
recommended engine oil and filter are
not used replace it according to the
maintenance schedule under severe
usage conditions.
• The engine oil change interval is set for the purpose of preventing
oil deterioration, and is not related
the amount of oil consumption; so,
check and refill the amount of the oil
regularly.
Information
When the oil pressure is low due to
insufficient engine oil, the Engine
Oil Pressure (
) warning light will
illuminate. In addition, the enhanced
engine protection system, which limits
the engine’s power is activated and the
Malfunction Indicator Lamp (
) will
illuminate when the vehicle is driven in
this state continuously. When the engine
oil pressure is restored, the warning light
and the enhanced engine protection system
will turn off after the engine is restarted.
CAUTION
The engine oil is very hot immediately
after the vehicle has been driven and
can cause burns during replacement.
Replace the engine oil after the engine
oil has cooled down.
WARNING
CALIFORNIA PROPOSITION 65
WARNING
Engine oil contains chemicals known to
the State of California to cause cancer,
birth defects and reproductive harm.
Used engine oil may cause irritation or
cancer of the skin if left in contact with
the skin for prolonged periods of time.
Always protect your skin by washing
your hands thoroughly with soap and
warm water as soon as possible after
handling used oil.

Maintenance9-18
The high-pressure cooling system has a
reservoir filled with year-round antifreeze
coolant. The reservoir is filled at the
factory.
Check the antifreeze protection and
coolant level at least once a year, at
the beginning of the winter season and
before traveling to a colder climate.
Checking the Coolant Level
„„Engine coolantEngine coolant
ONX4H090004ONX4H090004
„„Inverter coolantInverter coolant
ONX4H090005ONX4H090005
Check the condition and connections
of all cooling system hoses and
heater hoses. Replace any swollen or
deteriorated hoses.
The coolant level should be filled
between the MAX and the MIN marks on
the side of the coolant reservoir when
the engine is cool.
• Engine coolant/Inverter coolant for HEV
- If the coolant level is low, add the
selected anti-freeze according to
the proper coolant mix ratio to bring
the level to the MAX mark, but do
not overfill. • Inverter coolant for PHEV

- If the inverter coolant level for the
PHEV is low, it should be refilled
by an authorized HYUNDAI dealer/
service partner.
If frequent additions are required, see an
authorized HYUNDAI dealer for a cooling
system inspection.
WARNING - Inverter coolant for PHEV
Adding other cooling substances or
water might lead to inverter cooling
system degradation or even failure.
„„Engine coolant capEngine coolant cap
ONX4H090006ONX4H090006
„„Inverter coolant capInverter coolant cap
ONX4H090007ONX4H090007
WARNING
Never remove the engine
coolant cap and/or inverter
coolant cap or the drain plug
while the engine and radiator
are hot. Hot coolant and steam
may blow out under pressure,
causing serious injury.
ENGINE COOLANT/INVERTER COOLANT

09
9-19
Turn the vehicle off and wait until the
engine cools down. Use extreme care
when removing the engine coolant cap
and/or inverter coolant cap. Wrap a
thick towel around it, and turn it slowly
to the first stop. Step back while the
pressure is released from the cooling
system. When you are sure all the
pressure has been released, press down
on the cap, using a thick towel, and
continue turning to remove it.
Information
The engine coolant and/or inverter coolant
level is influenced by the hybrid system
temperature. Before checking or refilling
the engine coolant and/or inverter coolant,
turn the hybrid vehicle off.
WARNING
The electric motor for the cooling fan
may continue to operate or start up
when the engine is not running and
can cause serious injury. Keep hands,
clothing and tools away from the
rotating fan blades of the cooling fan.
Always turn off the vehicle unless the
vehicle has to be inspected with the
engine on. Be cautious as the cooling
fan may operate until you disconnect
the (-) battery terminal (For plug-in
hybrid vehicle) or the battery connector
(For hybrid vehicle).
WARNING
Make sure the coolant cap is properly
closed after refilling coolant. Otherwise
the engine could be overheated while
driving.
„„Engine compartment front viewEngine compartment front view
OTMH090008OTMH090008
1. Check if the coolant cap label is straight In front.
„„Engine compartment rear viewEngine compartment rear view
ONX4H090008ONX4H090008
2. Make sure that the tiny protrusions inside the coolant cap is securely
interlocked.

09
9-21
Checking the Hybrid Starter &
Generator (HSG) Belt
Have the Hybrid Starter & Generator
(HSG) belt inspected or replaced
according to the Maintenance Schedule
in this chapter by an authorized
HYUNDAI dealer.
CAUTION
When the HSG belt is worn out or
damaged, replace the belt.
Otherwise, it may cause engine
overheating or battery discharge.
WARNING
• Turn the vehicle off while you inspect
the engine or Hybrid Starter &
Generator (HSG) belt. Otherwise it
may result in serious injury.
• Keep hands, clothing etc. away from
the Hybrid Starter & Generator (HSG)
belt.
Checking the Brake Fluid Level
ONX4H090009ONX4H090009
Check the fluid level in the reservoir
periodically. The fluid level should be
between MAX and MIN marks on the side
of the reservoir.
Before removing the reservoir cap and
adding brake fluid, clean the area around
the reservoir cap thoroughly to prevent
brake fluid contamination.
If the level is low, add the specified brake
fluid to the MAX level. The level will fall
with accumulated mileage. This is a
normal condition associated with the
wear of the brake linings. If the fluid level
is excessively low, have the brake system
checked by an authorized HYUNDAI
dealer.
WARNING
If the brake system requires frequent
additions of fluid this could indicate
a leak in the brake system. Have the
vehicle inspected by an authorized
HYUNDAI dealer.
HYBRID STARTER &
GENERATOR (HSG) BELT BRAKE FLUID