2023 GENESIS G90 check engine

9-5
09
WARNING
Performing maintenance work on a
vehicle can be dangerous. If you lack
sufficient knowledge and experience or
the proper tools and equipment to do
the work, have it done by an authorized
retailer of Genesis Branded products.
ALWAYS follow these precautions for
performing maintenance work:

[Park your vehicle on level ground.
Shift the vehicle to P (Park), apply
the parking brake, and press the
Engine Start/Stop button to the OFF
position.

[Block the tires (front and back) to
prevent the vehicle from moving.
Remove loose clothing or jewelry
that can become entangled in
moving parts.

[If you must operate the engine
during maintenance, do so in an
outdoor area or in an area with
plenty of ventilation.

[Keep flames, sparks, or smoking
materials away from the battery and
fuel-related parts.
WARNING
Touching metal parts
Do not touch metal parts
(including strut bars) while
the engine is operating or
hot. Doing so could result in
serious personal injury. Turn
the engine off and wait until
the metal parts cool down to
perform maintenance work on
the vehicle.
The following lists are vehicle checks and
inspections that should be performed
by the owner or an authorized retailer
of Genesis Branded products at the
frequencies indicated to help ensure
safe, dependable operation of your
vehicle.
Any adverse conditions should be
brought to the attention of your dealer as
soon as possible.
These Owner Maintenance vehicle
checks are generally not covered by
warranties and you may be charged for
labor, parts and lubricants used.
OWNER MAINTENANCE

9-6
Maintenance
Owner Maintenance Schedule
When you stop for fuel:

[Check the coolant level in the engine
coolant reservoir or the liquid-cooled
intercooler coolant reservoir.

[Check the windshield washer fluid
level.

[Check for low or under-inflated tires.
WARNING
Be careful when checking your coolant
level if the motor compartment is hot.
This may result in coolant being blown
out of the opening and cause serious
burns and other injuries.
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: (for example,
every Spring and Autumn)

[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.

[Check the brake fluid level.

9-7
09
Follow Normal Maintenance Schedule if the vehicle is usually operated where none of the
following conditions apply. If any of the following conditions apply, you must follow the
Maintenance Under Severe Usage Conditions.

[Repeated driving short distance of less than 5 miles (8 km) in normal temperature or less
than 10 miles (16 km) in freezing temperature

[Extensive engine idling or low speed driving for long distances

[Driving on rough, dusty, muddy, unpaved, graveled or salt-spread roads

[Driving in areas using salt or other corrosive materials or in very cold weather

[Driving in heavy dust conditions

[Driving in heavy traffic area

[Driving on uphill, downhill, or mountain roads

[Using for towing or camping, and driving with loading on the roof

[Driving as a patrol car, taxi, other commercial use of vehicle towing

[Frequently driving under high speed or rapid acceleration/deceleration

[Frequently driving in stop-and-go conditions

[Engine oil usage which is not recommended (Mineral type, Semi-synthetic, Lower grade
spec, etc.)
If your vehicle is operated under the above conditions, you should inspect, replace or refill more
frequently than the following Normal Maintenance Schedule. After the periods or distance
shown in the chart, continue to follow the semi-synthetic, prescribed maintenance intervals.
NOTICE
After 10 years or 100,000 miles, we recommend to use severe maintenance schedule.
Information

[As 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 specification. If the recommended engine oil specification is not used, then
replace the engine oil according to the maintenance schedule under severe operating conditions.

[<0037004b0048000300590048004b004c0046004f0048000300500044005c0003004500480003004800540058004c00530053004800470003005a004c0057004b00030057004b004800030032004c004f0003002f004c004900480003003000440051004400
4a0048005000480051005700030036005c0056005700480050[ 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 severity,
the remaining oil life alert appears on the instrument cluster before the normal engine oil
replacement interval. Have the engine oil and filter changed by an authorized retailer of Genesis
Branded product.
-Oil Life Management System works when the recommended engine oil is used. So, if
recommended engine oil is not used, replace the engine oil according to the maintenance schedule
under severe usage condition.
Also, check the amount of engine oil regularly as this system assumes that the engine oil is being
filled normally.
-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 infotainment system screen. Then,
select ‘Yes’ when the message “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 retailer of Genesis Branded product.
SCHEDULED MAINTENANCE SERVICES

9-10
Maintenance
Normal Maintenance Schedule (Cont.)
MAINTENANCE
INTERVALS
MAINTENANCE
ITEMNumber of months or driving distance, whichever comes first
Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104
Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Automatic transmission fluid
*1
No check, No service required
Front (AWD) / rear differential oil
*2
III
Vapor hose, fuel filler cap and fuel tank IIIIII
Fuel tank air filter IIIIII
Fuel lines, hoses and connections IIIIII
Parking brake IIIIII
Brake fluidInspect every 8,000 miles (13,000 km) or 12 months,
Replace every 48,000 miles (78,000 km) or 48 months
Transfer case oil (AWD) No check, No service required
Air suspension I I I I I I I I I I I I I
I : Inspect and if necessary, adjust, correct, clean or replace.
R : Replace or change.
*1 :
Use only the specified automatic transmission fluid. (Refer to “Recommended lubricants and capacities” section in chapter 2 or
the label in the engine compartment.)
*2 :
Front/rear differential oil should be changed anytime, front/rear differential have been submerged in water. ÃFuel filter is considered to be maintenance free but the quality of fuel used may impact the frequency of maintenance
needed. If there are some important safety matters like fuel flow restriction, surging, loss of power, hard starting
problem, etc. replace the fuel filter immediately regardless of maintenance schedule and consult an authorized retailer
of Genesis Branded products for details.

9-11
09
Maintenance Under Severe Usage Conditions
The following items must be serviced more frequently on cars mainly used under
severe driving conditions. Refer to the chart below for the appropriate maintenance
intervals.
R : Replace
I : Inspect and if necessary, adjust, correct, clean or replace
Maintenance itemMaintenance
operationMaintenance intervalsDriving
condition
Engine oil and filter*1RReplace every 5,000 miles
(8,000 km) or 6 monthsD, H, I, L
MHEV (Mild Hybrid Vehicle)
belt (if equipped)IInspect every 3,000 miles
(5,000 km) or 6 months
B, C, D,
E, I, K
RReplace every 30,000 miles
(50,000 km) or 24 months
Air cleaner filter IInspect more frequently
depending on the conditionC, E
Spark plugs RReplace more frequently
depending on the conditionA, B, F, G,
H, I, K
Steering gear rack, linkage and
bootsIInspect more frequently
depending on the conditionC, D, E,
F, G
Front suspension ball joints IInspect more frequently
depending on the conditionC, D, E,
F, G
Disc brakes and pads, calipers
and rotorsIInspect more frequently
depending on the conditionC, D, E, G,
H, J, K
Parking brake IInspect more frequently
depending on the conditionC, D, G, H
Drive Shaft IInspect more frequently
depending on the conditionC, D, E, F,
G, H, I, J
Cabin air filter RReplace more frequently
depending on the conditionC, E, G
Automatic transmission fluid RReplace every 60,000 miles
(100,000 km)A, C, F, G,
H, I, J, K
Front differential oil (AWD) /
Rear differential oilRReplace every 72,000 miles
(120,000 km)C, D, E, G,
H, I, J
Propeller shaft IInspect more frequently
depending on the conditionC, D, E, F,
G, H, I, J
Transfer case oil (AWD) No check, No service required
*1 : Requires grade engine oil. If a lower grade
engine oil (mineral oil including Semi-synthetic) is used, then the engine oil and engine
oil filter must be replaced as indicated severe maintenance condition.

9-13
09
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.
Drive Belts
Inspect all drive belts for evidence
of cuts, cracks, excessive wear or oil
saturation and replace if necessary.
Drive belts should be checked
periodically for proper tension and
adjusted as necessary.
Information
When you are inspecting the belt, turn the
engine off.
Fuel Lines, Fuel Hoses and
Connections
Check the fuel lines, fuel hoses and
connections for leakage and damage.
Have an authorized retailer of Genesis
Branded products 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. Have you consult an
authorized retailer of Genesis Branded
products 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. Make sure
a new vapor hose or fuel filler cap is
correctly replaced.
Air Cleaner Filter
We recommend that the air cleaner filter
be replaced by an authorized retailer of
Genesis Branded products.
Spark Plugs
Make sure to install new spark plugs of
the correct heat range.
When assembling parts, be sure to
wipe out foreign substances 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.
Cooling System
Check cooling system components, such
as radiator, coolant reservoir, hoses and
connections for leakage and damage.
Replace any damaged parts.
EXPLANATION OF SCHEDULED MAINTENANCE ITEMS

9-14
Maintenance
Engine Coolant/Liquid-Cooled
Intercooler Coolant
The coolant should be changed at the
intervals specified in the maintenance
schedule.
Automatic Transmission Fluid
Automatic transmission fluid should
not be checked under normal usage
conditions, the Automatic transmission
fluid should be changed by an authorized
retailer of Genesis Branded products
according to the maintenance schedule.
Information
Automatic transmission fluid color is red
when new.
As the vehicle is driven, the automatic
transmission fluid will begin to look
darker.
This is a normal condition. It does not
need to be replaced based on the color
change.
NOTICE
The use of a non-specified fluid could
result in transmission malfunction and
failure.
Use only specified automatic
transmission fluid. (Refer to
“Recommended Lubricants and
Capacities” section in chapter 2.)
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.
Brake Discs, Pads, Calipers and
Rotors
Check the pads, the disc, and the rotor
for any excessive wear-out. Inspect
calipers for any 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.
Propeller Shaft
Check the propeller shaft, boots, clamps,
rubber couplings and center-bearing
rubber for cracks, deterioration, or
damage. Replace any damaged parts
and if necessary, repack the grease.

9-15
09
ENGINE OIL
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 engine
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.
Drive Shafts and Boots
Check the drive shafts, boots and clamps
for cracks, deterioration, or damage.
Replace any damaged parts and, if
necessary, repack the grease.
Air Conditioning Refrigerant
Check the air conditioning lines and
connections for leakage and damage.
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.