2023 JEEP GRAND CHEROKEE ECU

318IN CASE OF EMERGENCY
9. Finish tightening the lug nuts. Push down on the wrench while at the end of the handle for
increased leverage. Tighten the lug nuts in a
star pattern until each nut has been tightened
twice. For correct lug nut torque Úpage 396.
If in doubt about the correct tightness, have
them checked with a torque wrench by an
authorized dealer or at a service station.

Tighten Lug Nuts

10. Lower the jack to the fully closed position.
11. Return the Jack and tools back into the jack storage bin. Reinstall the jack storage cover by
firmly pushing down until the two side clips
lock into position. 12. After 25 miles (40 km), check the lug nut
torque with a torque wrench to ensure that all
lug nuts are properly seated against the wheel.
13. Have the aluminum road wheel and tire repaired as soon as possible and properly
secure the spare tire, jack and tool kit.
NOTE:Do not drive with the spare tire installed for more
than 50 miles (80 km) at a max speed of 50 mph
(80 km/h).
Second Row Seating — If Equipped

1. Securely store the road wheel in the cargo area.

Road Wheel Installed In Spare Tire Location

2. Turn the fastener clockwise until secured.

Reinstalling Tire Fastener

WARNING!
A loose tire or jack thrown forward in a collision
or hard stop could endanger the occupants of
the vehicle. Always stow the jack parts and the
spare tire in the places provided. Have the
deflated (flat) tire repaired or replaced
immediately.

23_WL_OM_EN_USC_t.book Page 318

IN CASE OF EMERGENCY323
In the event it is observed that the temperature
gauge is moving towards or close to the HOT (H)
position, you can reduce the potential for
overheating by taking the appropriate action.
On the highways — slow down.
In city traffic — while stopped, place the trans -
mission in NEUTRAL (N), but do not increase the
engine idle speed while preventing vehicle
motion with the brakes.
If your Air Conditioner (A/C) is on, turn it off. The
A/C system adds heat to the engine cooling
system and turning the A/C off can help remove
this heat.
You can also turn the temperature control to
maximum heat, the mode control to floor and
the blower control to high. This allows the heater
core to act as a supplement to the radiator and
aids in removing heat from the engine cooling
system.
MANUAL PARK RELEASE
To move the vehicle in cases where the
transmission will not shift out of PARK (P) (such as
a depleted battery), a Manual Park Release is
available.
To activate the Manual Park Release, see the
following steps:

1. Apply firm pressure to the brake pedal while seated in the driver’s seat.

2. Apply the Electric Park Brake (EPB), if possible.
3. Using a flathead screwdriver or similar tool, remove the Manual Park Release access
cover, which is to the lower left of the steering
column.

Manual Park Release Access Cover
CAUTION!
Driving with a hot cooling system could damage
your vehicle. If the temperature gauge reads
“H,” pull over and stop the vehicle. Idle the
vehicle with the air conditioner turned off until
the pointer drops back into the normal range. If
the pointer remains on the “H” and you hear
continuous chimes, turn the engine off
immediately and call for service.
WARNING!
You should be seated in the driver’s seat with
your foot firmly placed on the brake pedal to
maintain control of the vehicle before activating
the Manual Park Release. If possible, you should
apply the parking brake. Activating the Manual
Park Release will allow your vehicle to roll away if
it is not secured or properly connected to a tow
vehicle. Activating the Manual Park Release on
an unsecured vehicle could lead to serious
injury or death for those in or around the vehicle.
7

23_WL_OM_EN_USC_t.book Page 323

324IN CASE OF EMERGENCY
NOTE:Insert the flathead screwdriver or similar tool in the
lower notch of the access cover and gently rotate
clockwise to remove.

Manual Park Release Location

4. Unlock the orange lock plug by turning it a quarter turn counterclockwise.
Locked — Unlocked Position

5. Pull the lock plug out as far as it will go, then release it. The transmission should now be in
NEUTRAL (N), allowing the vehicle to be
moved.
NOTE:When the lever is locked in the released position,
the lock plug and tether will remain outside of the
trim panel and the access cover cannot be rein -
stalled.
6. Release the EPB only when the vehicle is securely connected to a tow vehicle. To Reset The Manual Park Release:

1. Apply firm pressure to the brake pedal while
seated in the driver’s seat.

2. Pull the lock plug out again, then release it.
3. Allow the tether to retract with the lever back to its original position.
4. Verify that the transmission is in PARK (P).

5. Confirm that the tether has retracted fully, then firmly push the orange lock plug back to
the locking position within the housing.
Reinstall the access cover. If the access cover
cannot be reinstalled, repeat steps 1
through 4.
23_WL_OM_EN_USC_t.book Page 324

IN CASE OF EMERGENCY327
NOTE:
You must ensure that the Auto Park Brake
Úpage 123 feature is disabled before towing
this vehicle to avoid inadvertent Electric Park
Brake engagement. The Auto Park Brake
feature is enabled or disabled via the customer
programmable features in the Uconnect
Settings.
Vehicles with a discharged battery, or total elec -
trical failure when the Electric Park Brake (EPB)
is engaged, will need a wheel dolly or jack to
raise the rear wheels off the ground when
moving the vehicle onto a flatbed.
The Safehold feature will engage the Electric
Park Brake whenever the driver's door is
opened (if the battery is connected, ignition is
ON, transmission is not in PARK, and brake
pedal is released). If you are towing this vehicle
with the ignition in the ON/RUN mode, you must
manually disable the Electric Park Brake each
time the driver's door is opened by pressing the
brake pedal and then releasing the EPB. If you must use the accessories (wipers,
defrosters, etc.) while being towed, the ignition
must be in the ON/RUN mode.
If the vehicle's battery is discharged, instructions
on shifting the automatic transmission out of PARK
(P) in order to move the vehicle Ú
page 323.
REAR-WHEEL DRIVE MODELS
FCA US LLC recommends towing your vehicle with
all four wheels OFF the ground using a flatbed.
If flatbed equipment is not available, and the
transmission is operable, the vehicle may be towed
(with rear wheels off the ground) under the
following conditions:
The transmission must be in NEUTRAL (N). For
instructions on shifting the transmission to
NEUTRAL (N) when the engine is off
Ú page 323.
The towing speed must not exceed 30 mph
(48 km/h).
The towing distance must not exceed 30 miles
(48 km).
CAUTION!
Do not use sling type equipment when towing.
Vehicle damage may occur.
When securing the vehicle to a flat bed truck,
do not attach to front or rear suspension
components. If vehicle is equipped with
Quadra-lift air suspension, secure vehicle only
with tire/wheel straps (no suspension compo -
nents or body) to prevent air suspension from
adjusting during towing against securement
straps and causing damage. Damage to your
vehicle may result from improper towing.
CAUTION!
Towing faster than 30 mph (48 km/h) or
farther than 30 miles (48 km) with rear
wheels on the ground can cause severe trans -
mission damage. Damage from improper
towing is not covered under the New Vehicle
Limited Warranty.
7

23_WL_OM_EN_USC_t.book Page 327

SERVICING AND MAINTENANCE341
Refrigerant Recovery And Recycling —
R–1234yf
R–1234yf Air Conditioning Refrigerant is a
Hydrofluoroolefin (HFO) that is endorsed by the
Environmental Protection Agency and is an
ozone-friendly substance with a low
global-warming potential. The manufacturer
recommends that air conditioning service be
performed by an authorized dealer using recovery
and recycling equipment.
NOTE:Use only manufacturer approved A/C system PAG
compressor oil, and refrigerants.
Cabin Air Filter Replacement
For the proper maintenance intervals Úpage 331. The cabin air filter is located in the fresh air inlet
behind the glove compartment. Perform the
following procedure to replace the filter:

1. Open the glove compartment and remove all
contents.

2. There is a glove compartment travel stop on the right side of the glove compartment door.
Partially close the glove compartment door
and pull the travel stop toward you to release
the glove compartment travel stop.

Glove Compartment
3. With the glove compartment door loose,
remove the glove compartment tension tether
and tether clip by sliding the clip toward the
face of the glove compartment door and lifting
the clip out of glove compartment door.

Side Of Glove Compartment

4. Lower the glove compartment door to the floor.
5. Squeeze the retaining tabs together that secures the cabin air filter cover to the HVAC
housing. Unhinge the filter cover on the right
side to fully remove the cover.
WARNING!
Do not remove the cabin air filter while the
vehicle is running, or while the ignition is in the
ON/RUN mode. With the cabin air filter removed
and the blower operating, the blower can
contact hands and may propel dirt and debris
into your eyes, resulting in personal injury.
1 — Glove Compartment Travel Stop
2 — Glove Compartment Door
1 — Glove Compartment Tension Tether
2 — Glove Compartment Door
8

23_WL_OM_EN_USC_t.book Page 341

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!

23_WL_OM_EN_USC_t.book Page 350

364SERVICING AND MAINTENANCE
F41A –10 Amp RedMOD Occupant Class / Steering
Column Lock
F41B Spare
F42A –10 Amp RedParktronics System MOD (PTS) / MOD
Haptic Lane Feedback / Trailer Tow
Module
F42B MOD HVAC Control / Frt ERC Motor
Ctrl / RR ERC Motor Ctrl
F43A ––Spare
F43B ––Spare
F44 –15 Amp BlueMOD Cluster CCN / MOD SGW
(Cybersecurity)
F45 ––Spare
F46 ––Spare
F47A ––Spare
F47B ––Spare
F48A ––Spare
F48B ––Spare
F49 –7.5 Amp BrownMOD RF HUB / Module Ignition
(MD KIN)
Cavity
Cartridge Fuse Micro FuseDescription

* If Equipped

23_WL_OM_EN_USC_t.book Page 364

366SERVICING AND MAINTENANCE
F63A –15 Amp BlueMedia HUB #1 Frt / Port UC1 Dual
USB Frt / Wireless Charging Pad MOD
(WCPM)
F63B Not Populated
F64A –10 Amp RedMOD ORC
F64B Steering Column Control Module
(SCCM)
F65 –5 Amp TanMOD SGW (Cybersecurity)
F66 ––Spare
CB1 ––Spare
CB2 ––Spare
CB3 ––Spare
CB4 ––Spare
CB5 ––Spare
CB6 ––Spare
Cavity Cartridge Fuse Micro FuseDescription

* If Equipped

23_WL_OM_EN_USC_t.book Page 366