2023 JEEP GRAND CHEROKEE check engine light

SAFETY305
PERIODIC SAFETY CHECKS YOU SHOULD
M
AKE OUTSIDE THE VEHICLE
Tires
Examine tires for excessive tread wear and uneven
wear patterns. Check for stones, nails, glass, or
other objects lodged in the tread or sidewall.
Inspect the tread for cuts and cracks. Inspect
sidewalls for cuts, cracks, and bulges. Check the
lug nut/bolt torque for tightness. Check the tires
(including spare) for proper cold inflation pressure.
Lights
Have someone observe the operation of brake
lights and exterior lights while you work the
controls. Check turn signal and high beam
indicator lights on the instrument panel.
Door Latches
Check for proper closing, latching, and locking.
Fluid Leaks
Check area under the vehicle after overnight
parking for fuel, coolant, oil, or other fluid leaks.
Also, if gasoline fumes are detected or if fuel or
brake fluid leaks are suspected, the cause should
be located and corrected immediately.
EXHAUST GAS
NEVER place any objects under the floor mat
(e.g., towels, keys, etc.). These objects could
change the position of the floor mat and may
cause interference with the accelerator,
brake, or clutch pedals.
If the vehicle carpet has been removed and
re-installed, always properly attach carpet to
the floor and check the floor mat fasteners are
secure to the vehicle carpet. Fully depress
each pedal to check for interference with the
accelerator, brake, or clutch pedals then
re-install the floor mats.
It is recommended to only use mild soap and
water to clean your floor mats. After cleaning,
always check your floor mat has been properly
installed and is secured to your vehicle using
the floor mat fasteners by lightly pulling mat.
WARNING!
WARNING!
Exhaust gases can injure or kill. They contain
carbon monoxide (CO), which is colorless and
odorless. Breathing it can make you
unconscious and can eventually poison you. To
avoid breathing (CO), follow these safety tips:
Do not run the engine in a closed garage or in
confined areas any longer than needed to
move your vehicle in or out of the area.
If you are required to drive with the trunk/lift -
gate/rear doors open, make sure that all
windows are closed and the climate control
BLOWER switch is set at high speed. DO NOT
use the recirculation mode.
If it is necessary to sit in a parked vehicle with
the engine running, adjust your heating or
cooling controls to force outside air into the
vehicle. Set the blower at high speed.
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330
SERVICING AND MAINTENANCE
SCHEDULED SERVICING
Your vehicle is equipped with an automatic oil
change indicator system. The oil change indicator
system will remind you that it is time to take your
vehicle in for scheduled maintenance.
Based on engine operation conditions, the oil
change indicator message will illuminate. This
means that service is required for your vehicle.
Operating conditions such as frequent short-trips,
trailer tow, extremely hot or cold ambient
temperatures, and E85 fuel usage will influence
when the “Oil Change Required” message is
displayed. Have your vehicle serviced as soon as
possible, within the next 500 miles (805 km).An authorized dealer will reset the oil change
indicator message after completing the scheduled
oil change.
NOTE:Under no circumstances should oil change
intervals exceed 10,000 miles (16,000 km),
12 months or 350 hours of engine run time,
whichever comes first. The 350 hours of engine
run or idle time is generally only a concern for fleet
customers.
Once A Month Or Before A Long Trip:
Check engine oil level.
Check windshield washer fluid level.
Check the tire inflation pressures and look for
unusual wear or damage.
Check the fluid levels of the coolant reservoir,
brake master cylinder and fill as needed.
Check function of all interior and exterior lights.

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SERVICING AND MAINTENANCE337
CHECKING OIL LEVEL
To ensure proper engine lubrication, the engine oil
must be maintained at the correct level. Check the
oil level at regular intervals, such as every fuel
stop. The best time to check the engine oil level is
about five minutes after a fully warmed up engine
is shut off.
Checking the oil while the vehicle is on level ground
will improve the accuracy of the oil level readings.
There are four possible dipstick types:
Crosshatched zone.
Crosshatched zone marked SAFE.
Crosshatched zone marked with MIN at the low
end of the range and MAX at the high end of the
range.
Crosshatched zone marked with dimples at the
MIN and the MAX ends of the range.
NOTE:Always maintain the oil level within the crosshatch
markings on the dipstick.
Adding 1 qt (1.0 L) of oil when the reading is at the
low end of the dipstick range will raise the oil level
to the high end of the range marking.
NOTE:Always maintain the oil level within the crosshatch
markings on the dipstick.
NOTE:Use care when filling under hood fluids such as
engine oil, washer fluid, antifreeze, etc., to
minimize spillage onto the top of the engine. Any
excess fluid that is spilled onto the top of the
engine should be removed using compressed air
or an absorbent cloth.
ADDING WASHER FLUID
The instrument cluster display will indicate when
the washer fluid level is low. When the sensor
detects a low fluid level, the Low Washer Fluid
Warning Light will illuminate and the “Washer Fluid
Low” message will display.
The fluid reservoir for the windshield washers and
the rear window washer is shared. The fluid
reservoir is located in the engine compartment, be
sure to check the fluid level at regular intervals. Fill
the reservoir with windshield washer solvent only
(not radiator antifreeze). When refilling the washer
fluid reservoir, take some washer fluid and apply it
to a cloth or towel and wipe clean the wiper blades,
this will help blade performance. To prevent
freeze-up of your windshield washer system in cold
weather, select a solution or mixture that meets or
exceeds the temperature range of your climate.
This rating information can be found on most
washer fluid containers.
NOTE:Use care when filling under hood fluids such as
engine oil, washer fluid, antifreeze, etc., to
minimize spillage onto the top of the engine. Any
excess fluid that is spilled onto the top of the
engine should be removed using compressed air
or an absorbent cloth.
WARNING!
Commercially available windshield washer
solvents are flammable. They could ignite and
burn you. Care must be exercised when filling or
working around the washer solution.
CAUTION!
Do not travel with the windshield washer fluid
reservoir empty: the windshield washers are
essential for improving visibility.
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350SERVICING AND MAINTENANCE
(Continued)
Make sure that the coolant expansion bottle
overflow hoses are not kinked or obstructed.
Keep the front of the radiator clean. If your
vehicle is equipped 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 cooling performance, poor gas mileage,
and increased emissions.
BRAKE SYSTEM
In order to ensure brake system performance, all
brake system components should be inspected
periodically. For the proper maintenance intervals
Ú page 331.
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.
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's recommended brake
fluid Ú page 402. 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 an 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!

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TECHNICAL SPECIFICATIONS397
Tighten the lug nuts/bolts in a star pattern until
each nut/bolt has been tightened twice. Ensure
that the socket is fully engaged on the lug nut/bolt
(do not insert it half way).
NOTE:If in doubt about the correct tightness, have them
checked with a torque wrench by an authorized
dealer or service station.
After 25 miles (40 km), check the lug nut/bolt
torque to be sure that all the lug nuts/bolts are
properly tightened.

Torque Pattern

FUEL REQUIREMENTS
While operating on gasoline with the required
octane number, hearing a light knocking sound
from the engine is not a cause for concern.
However, if the engine is heard making a heavy
knocking sound, see a dealer immediately. Use of
gasoline with an octane number lower than
recommended can cause engine failure and may
void the New Vehicle Limited Warranty.
Poor quality gasoline can cause problems such as
hard starting, stalling, and hesitations. If you
experience these symptoms, try another brand of
gasoline before considering service for the vehicle.
2.0L ENGINE
This engine is designed to meet all
emissions requirements, and provide
satisfactory fuel economy and
performance, when using high-quality
unleaded regular gasoline having an octane rating
of 87, as specified by the (R+M)/2 method. The
use of 91 or higher octane premium gasoline will
allow these engines to operate to optimal
performance. This increase in performance is most
noticeable in hot weather or under heavy load
conditions, such as while towing.
3.6L ENGINE
Do not use E-85 flex fuel or ethanol blends greater
than 15% in this engine.
This engine is designed to meet all
emissions regulations and provide
optimum fuel economy and performance
when using high quality unleaded regular
gasoline having a posted octane number of 87 as
specified by the (R+M)/2 method. The use of
higher octane premium gasoline is not required, as
it will not provide any benefit over regular gasoline
in these engines.
5.7L ENGINE
Do not use E-85 flex fuel or ethanol blends greater
than 15% in this engine.
This engine is designed to meet all
emission regulations and provide
satisfactory fuel economy and
performance when using high-quality
unleaded gasoline having an octane range of 87 to
89 as specified by the (R+M)/2 method. The use of
89 octane plus gasoline is recommended for
optimum performance and fuel economy.
WARNING!
To avoid the risk of forcing the vehicle off the
jack, do not tighten the lug nuts/bolts fully until
the vehicle has been lowered. Failure to follow
this warning may result in personal injury.
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410 Anti-Lock Brake System (ABS)
............. 111, 248Anti-Lock Warning Light................................. 111Apps.............................................................. 233Arming System Security Alarm............................................. 26Assist, Hill Start............................................. 254Audio Systems (Radio)......................... 104, 203Auto Down Power Windows............................. 82Auto Hold............................................. 115, 125Automatic Folding Mirrors............................... 53Automatic Headlights...................................... 59Automatic High Beams.................................... 59Automatic Temperature Control (ATC)............. 72Automatic Transmission...................... 119, 127Adding Fluid.............................................. 351Fluid And Filter Change............................. 351Fluid Change............................................. 351Fluid Level Check...................................... 351Fluid Type........................................ 351, 402Special Additives....................................... 351Automatic Transmission Limp Home Mode... 129AutoPark........................................................ 120Autostick........................................................ 130Operation.................................................. 130AUX Cord.......................................................... 77Auxiliary Driving Systems............................... 258
Auxiliary Electrical Outlet (Power Outlet).......... 78Auxiliary Power Outlet...................................... 78Axle Fluid...................................................... 402
B
Battery................................................. 109, 338Charging System Light.............................. 109Keyless Key Fob Replacement.................... 19Battery Saver Feature...................................... 62Belts, Seat.................................................... 303Body Mechanism Lubrication....................... 343Bodywork...................................................... 392B-Pillar Location............................................ 379Brake Assist System..................................... 250Brake Control System, Electronic.................. 250Brake Fluid.......................................... 350, 402Brake System...................................... 350, 396Anti-Lock (ABS)......................................... 396Fluid Check............................................... 350Master Cylinder........................................ 350Parking..................................................... 123Warning Light........................................... 108Brake/Transmission Interlock...................... 127Bulb Replacement........................................ 374Bulbs, Light................................................... 305
C
Camera, Front............................................... 176Camera, Night Vision..................................... 177Camera, Rear....................................... 174, 181Camera, Rear Washer................................... 174Camera, Surround View................................ 181Capacities, Fluid............................................ 400Caps, FillerOil (Engine)............................................... 334Radiator (Coolant Pressure)..................... 348Car Washes................................................... 393Carbon Monoxide Warning................... 305, 306Care And Maintenance................................. 392Cargo Area Cover.............................................92Cargo Area Storage..........................................90Cargo Compartment.........................................90Cargo Tie-Downs..............................................91Cellular Phone............................................... 247Center Console, Front......................................75Center Console, Rear.......................................75Chains, Tire................................................... 389ChargingWireless.......................................................80Chart, Tire Sizing........................................... 375Check Engine Light
(Malfunction Indicator Light)......................... 118

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411
Checking Your Vehicle For Safety
.................. 303Checks, Safety............................................... 303Child Restraint............................................... 289Child Restraints Booster Seats............................................ 291Child Seat Installation............................... 300How To Stow An unused ALR Seat Belt..... 297Infant And Child Restraints....................... 290Locating The LATCH Anchorages............... 295Lower Anchors And Tethers For Children.. 292Older Children And Child Restraints..........291Seating Positions...................................... 292Child Safety Locks........................................... 31Clean Air Gasoline......................................... 398CleaningWheels...................................................... 388Climate Control................................................ 66Automatic.................................................... 66Rear............................................................ 69CNG And LP Fuel System Modifications......... 398Cold Weather Operation................................ 122Compact Spare Tire....................................... 386Contract, Service........................................... 405Cooling Pressure Cap (Radiator Cap).............348
Cooling System............................................. 346Adding Coolant (Antifreeze)...................... 347Coolant Level................................... 348, 349Cooling Capacity....................................... 400Disposal Of Used Coolant......................... 348Drain, Flush, And Refill............................. 347Inspection............................... 347, 348, 349Points To Remember................................ 349Pressure Cap............................................ 348Radiator Cap............................................ 348Selection Of Coolant(Antifreeze)......................... 347, 400, 401Corrosion Protection..................................... 392Cruise Control (Speed Control)..................... 142Cruise Light.......................................... 115, 116Customer Assistance.................................... 403Customer Programmable Features............... 204Cybersecurity................................................ 203
D
Daytime Running Lights................................... 58Defroster, Windshield................................... 304De-Icer, Remote Start...................................... 26De-Icer, Windshield.......................................... 66Diagnostic System, Onboard......................... 117Digital Instrument Cluster ¹.............................. 96
DipsticksOil (Engine)............................................... 337DisposalAntifreeze (Engine Coolant)...................... 348Do Not Use E-85 In Non-Flex Fuel Vehicles... 398Door Ajar....................................................... 109Door Locks................................................27, 31Child-Protection Door Lock — Rear Doors....31Doors...............................................................27Driver’s Seat Back Tilt......................................36Driving........................................................... 199Tips........................................................... 199DrowsyDriverDetection................................. 249
E
Electric Brake Control System....................... 250Anti-Lock Brake System............................ 248Electronic Roll Mitigation................. 251, 257Electric Parking Brake................................... 123Electrical Outlet, Auxiliary (Power Outlet).........78
Electronic Stability Control (ESC)... 111, 112, 251
Electronic Sway Bar Disconnect.................... 133Electronic Throttle Control Warning Light...... 109
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412 Emergency Freeing A Stuck Vehicle
............................. 325Hazard Warning Flashers.......................... 307Jump Starting............................................ 319Manual Park Release................................ 323Refueling................................................... 321Tow Hooks................................................. 328Towing A Disabled Vehicle......................... 326Emergency Braking........................................ 263Emergency, In Case OfJacking...................................................... 310Emission Control System Maintenance......... 118Engine........................................................... 334Air Cleaner................................................. 339Break-In Recommendations...................... 122Checking Oil Level..................................... 337Compartment......................... 334, 335, 336Compartment Identification... 334, 335, 336Coolant (Antifreeze)................................... 109Cooling...................................................... 346Exhaust Gas Caution....................... 305, 306Fails To Start............................................. 122Flooded, Starting....................................... 122Fuel Requirements.......................... 397, 400Jump Starting............................................ 319Oil.................................................... 338, 400
Oil Filler Cap............................................. 334Oil Filter.................................................... 339Oil Selection........................... 338, 400, 401Oil Synthetic............................................. 339Starting..................................................... 119Engine Oil Life Reset
b
............................... 100
Enhanced Accident Response Feature...287, 329
Ethanol......................................................... 398Exhaust Gas Cautions.......................... 305, 306Exhaust System................................... 305, 345Extend, Seats................................................... 43Exterior Lights............................... 57, 305, 374
F
FamCam System........................................... 177FiltersAir Cleaner................................................ 339Air Conditioning..................................73, 341Engine Oil................................................. 339Engine Oil Disposal................................... 339FireTV............................................................ 240FlashersTurn Signals.................................... 116, 305Flash-To-Pass................................................... 59Flooded Engine Starting................................ 122Fluid Capacities............................................ 400
Fluid Leaks.................................................... 305Fluid Level ChecksBrake........................................................ 350Engine Oil................................................. 337Fluids And Lubricants.................................... 402Fog Lights.............................................. 61, 115Fold-Flat Seats.................................................36Forward Collision Warning.......... 113, 115, 261Four Wheel Drive............... 113, 114, 131, 134Operation.................................................. 131Shifting..................................................... 114System...................................................... 131Four Wheel Drive Operation.......................... 131Freeing A Stuck Vehicle................................. 325Front And Rear ParkSense System............... 159Front Axle (Differential)................................. 351Front View Camera........................................ 176Fuel............................................................... 397Additives................................................... 398Clean Air................................................... 398Ethanol..................................................... 398Gasoline................................................... 397Materials Added....................................... 398Methanol.................................................. 398

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