2023 JEEP WRANGLER transmission

128STARTING AND OPERATING
4L
AutoPark will be disabled when operating the vehicle in
4L.
The message “AutoPark Disabled ” will be displayed in the
instrument cluster.
Additional customer warnings will be given when both of
these conditions are met:
 Vehicle is not in PARK
 Driver’s door is ajar
The message “ AutoPark Not Engaged ” will be displayed in
the instrument cluster. A warning chime will continue until
you shift the vehicle into PARK or the driver’s door is
closed.
ALWAYS DO A VISUAL CHECK
that your vehicle is in PARK
by looking for the "P" in the instrument cluster display and
on the gear selector. As an added precaution, always apply
the parking brake when exiting the vehicle.
EXTENDED PARK STARTING
NOTE:Extended Park condition occurs when the vehicle has not
been started or driven for at least 30 days.
1. Install a battery charger or jumper cables to the
battery to ensure a full battery charge during the
crank cycle.

2. Place the ignition in the START position and release it when the engine starts. For vehicles equipped with
the ENGINE START/STOP button, press and hold the
brake pedal while pushing the ENGINE START/STOP
button once.
3. If the engine fails to start within 10 seconds, place the ignition in the OFF position, wait 10 to 15 seconds
to allow the starter to cool, then repeat the “Extended
Park Starting” procedure.
4. If the engine fails to start after eight attempts, allow the starter to cool for at least 10 minutes, then repeat
the procedure.
IF ENGINE FAILS TO START
If the engine fails to start after following the “Normal
Starting” procedure and the vehicle has not experience an
extended park condition, as previously defined, it may be
flooded. Push the accelerator pedal all the way to the floor
and hold it there. Crank the engine for no more than 10 to
15 seconds. This should clear any excess fuel in case the
engine is flooded. Leave the ignition in the RUN position,
release the accelerator pedal and repeat the “Normal
Starting” procedure.
EXTREME COLD WEATHER
(B
ELOW –22°F OR −30°C)
To ensure reliable starting at these temperatures, use of
an externally powered electric engine block heater
(available from an authorized dealer) is recommended.
WARNING!
If vehicle speed is above 1.2 mph (1.9 km/h), the
transmission will default to NEUTRAL until the vehicle
speed drops below 1.2 mph (1.9 km/h). A vehicle left in
the NEUTRAL position can roll. As an added precaution,
always apply the parking brake when exiting the vehicle.
CAUTION!
To prevent damage to the starter, do not crank
continuously for more than 10 seconds at a time. Wait
10 to 15 seconds before trying again.
WARNING!
 Never pour fuel or other flammable liquid into the
throttle body air inlet opening in an attempt to start
the vehicle. This could result in flash fire causing
serious personal injury.
 Do not attempt to push or tow your vehicle to get it
started. Vehicles equipped with an automatic trans -
mission cannot be started this way. Unburned fuel
could enter the catalytic converter and once the
engine has started, ignite and damage the converter
and vehicle.
 If the vehicle has a discharged battery, booster
cables may be used to obtain a start from a booster
battery or the battery in another vehicle. This type of
start can be dangerous if done improperly
Úpage 298.
CAUTION!
To prevent damage to the starter, do not continuously
crank the engine for more than 10 to 15 seconds at a
time. Wait 10 to 15 seconds before trying again.

23_JL_OM_EN_USC_t.book Page 128

STARTING AND OPERATING129
(Continued)
AFTER STARTING
The idle speed is controlled automatically and will
decrease as the engine warms up.
STARTING THE ENGINE — DIESEL ENGINE
(IF EQUIPPED)
Before starting your vehicle, adjust your seat, both inside
and outside mirrors, and fasten your seat belts.
The starter is allowed to crank for up to 25-second
intervals. Waiting two minutes between such intervals will
protect the starter from overheating.
NOTE:Engine start up in very low ambient temperature could
result in evident white smoke. This condition will
disappear as the engine warms up.
AUTOMATIC TRANSMISSION
Start the engine with the transmission gear selector in the
PARK (P) position. Apply the brake before shifting to any
driving range.
EXTREME COLD WEATHER
The cartridge block heater clips into the engine block near
the water jacket and transfers heat to the coolant. It
requires a 110–115 Volt AC electrical outlet with a
grounded, three-wire extension cord. Its use is
recommended for environments that routinely fall below
-10°F (-23°C). It should be used when the vehicle has not
been running overnight or longer periods and should be
plugged in for two hours prior to start. Its use is required
for cold starts with temperatures under -20°F (-28°C).
NOTE:The engine block heater and heater cord are
factory-installed options. If your vehicle is not equipped,
heater and heater cords are available from an authorized
Mopar® dealer.
A 12 Volt heater built into the fuel filter housing aids in
preventing fuel gelling. It is controlled by a built-in ther -
mostat.
 A Diesel Pre-Heat system both improves engine
starting and reduces the amount of white smoke
generated by a warming engine.
WARNING!
Before exiting a vehicle, always come to a complete
stop, then shift the automatic transmission into
PARK and apply the parking brake.
 Always make sure the ignition is in the OFF position,
key fob is removed from the vehicle and vehicle is
locked.
 Never leave children alone in a vehicle, or with
access to an unlocked vehicle. Leaving children in a
vehicle unattended is dangerous for a number of
reasons. A child or others could be seriously or fatally
injured. Children should be warned not to touch the
parking brake, brake pedal or the gear selector.
Do not leave the key fob in or near the vehicle, or in
a location accessible to children, and do not leave
the ignition of a vehicle equipped with Keyless
Enter ‘n Go™ in the ACC or ON/RUN position. A child
could operate power windows, other controls, or
move the vehicle.
 Do not leave children or animals inside parked vehi -
cles in hot weather. Interior heat buildup may cause
serious injury or death.
CAUTION!
 The engine is allowed to crank as long as
25 seconds. If the engine fails to start during this
period, please wait at least two minutes for the
starter to cool before repeating start procedure.
 If the Water in Fuel Indicator Light remains on, DO
NOT START engine before you drain the water from
the fuel filters to avoid engine damage
Úpage 321.
WARNING!
4

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STARTING AND OPERATING131
COLD WEATHER PRECAUTIONS
Operation in ambient temperature below 32°F (0°C) may
require special considerations. The following charts
suggest these options:
Fuel Operating Range
NOTE:Use Ultra Low Sulfur Diesel (ULSD) Fuels ONLY.

Fuel Operating Range Chart

*Number 1 ULSD Fuel should only be used where extended arctic
conditions 0°F (-18°C) exist.
NOTE:
Use of Climatized ULSD Fuel or Number 1 ULSD Fuel
results in a noticeable decrease in fuel economy.
 Climatized ULSD Fuel is a blend of Number 2 ULSD
Fuel and Number 1 ULSD Fuel which reduces the
temperature at which wax crystals form in fuel.
 The fuel grade should be clearly marked on the pump
at the fuel station.
 The engine requires the use of Ultra Low Sulfur Diesel
Fuel . Use of incorrect fuel could result in engine and
exhaust system damage
Úpage 371.
 If climatized or Number 1 ULSD Fuel is not available,
and you are operating below 20°F (-6°C), in sustained
arctic conditions, Mopar® Premium Diesel Fuel Treat -
ment (or equivalent) is recommended to avoid gelling
(see Fuel Operating Range Chart).
Engine Oil Usage
See Engine Fluids and Lubricants for the correct engine oil
viscosity Úpage 374.
Winter Front Cover
A Winter front or cold weather cover can be used in
ambient temperatures below 32°F (0°C), especially
during extended idle conditions. This cover is equipped
with four flaps for managing total grille opening in varying
ambient temperatures. If a Winter front or cold weather
cover is to be used, the flaps should be in the full open
position to allow air flow to the cooling module and automatic transmission oil cooler. When ambient
temperatures drop below 0°F (-17°C) the four flaps need
to be closed. A suitable cold weather cover is available
from a Mopar® dealer.
Engine Warm-Up
Avoid full throttle operation when the engine is cold. When
starting a cold engine, bring the engine up to operating
speed slowly to allow the oil pressure to stabilize as the
engine warms up.
If temperatures are below 32°F (0°C), operate the engine
at moderate speeds for five minutes before full loads are
applied.
ENGINE IDLING
Avoid prolonged idling. Long periods of idling may be
harmful to your engine because combustion chamber
temperatures can drop so low that the fuel may not burn
completely. Incomplete combustion allows carbon and
varnish to form on piston rings, cylinder head valves, and
injector nozzles. Also, the unburned fuel can enter the
crankcase, diluting the oil and causing rapid wear to the
engine.
4

23_JL_OM_EN_USC_t.book Page 131

132STARTING AND OPERATING
STOPPING THE ENGINE
After full load operation, idle the engine for a few minutes before shutting it down. This idle period will allow the lubricating oil and coolant to carry excess heat away from the
turbocharger.
NOTE:Refer to the following chart for proper engine shutdown.
NOTE:Under certain conditions the engine fan will run after the
engine is turned off. These conditions are under high load
and high temperature conditions.
COOLING SYSTEM TIPS — AUTOMATIC
T
RANSMISSION
To reduce the potential for engine and transmission
overheating in high ambient temperature conditions, take
the following actions:
 City Driving — When stopped, shift the transmission
into NEUTRAL (N) and increase engine idle speed.
 Highway Driving — Reduce your speed. 
Up Steep Hills — Select a lower transmission gear.
 Air Conditioning — Turn it off temporarily.
NOTE:If the coolant temperature is too high, the A/C will auto -
matically turn off.
Do Not Operate The Engine With Low Oil
Pressure
If the Oil Pressure Warning Light turns on while driving,
stop the vehicle and shut down the engine as soon as
possible. A chime will sound when the light turns on. After
the vehicle is safely stopped, restart the engine and
monitor the Oil Pressure Warning Light. If the Oil Pressure
Warning Light is still illuminated, turn the engine OFF and contact an authorized dealer for further assistance. If the
lamp is no longer illuminated, the engine can be operated
but it is recommended to take the vehicle to an authorized
dealer as soon as possible.
NOTE:Do not operate the vehicle until the cause is corrected.
This light does not show how much oil is in the engine. The
engine oil level must be checked under the hood.
Driving Condition Load Turbocharger Temperature Idle Time (min.) Before Engine Shutdown
Stop and Go EmptyCoolNone
Stop and Go Medium 0.5
Highway Speeds MediumWarm 1.0
City Traffic Maximum GCWR 1.5
Highway Speeds Maximum GCWR 2.0
Uphill Grade Maximum GCWR Hot2.5
CAUTION!
If oil pressure falls to less than normal readings, shut
the engine off immediately. Failure to do so could result
in immediate and severe engine damage.

23_JL_OM_EN_USC_t.book Page 132

STARTING AND OPERATING133
Do Not Operate The Engine With Failed
Parts
All engine failures give some warning before the parts fail.
Be on the alert for changes in performance, sounds, and
visual evidence that the engine requires service. Some
important clues are:
Engine misfiring or vibrating severely
 Sudden loss of power
 Unusual engine noises
 Fuel, oil or coolant leaks
 Sudden change, outside the normal operating range, in
the engine operating temperature
 Excessive smoke
 Oil pressure drop
ENGINE BREAK-IN RECOMMENDATIONS —
GASOLINE ENGINE (IF EQUIPPED)
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration within the
limits of local traffic laws contributes to a good break-in.
Wide-open throttle acceleration in low gear can be
detrimental and should be avoided.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil changes
should be consistent with anticipated climate conditions
under which vehicle operations will occur. For the recommended viscosity and quality grades
Úpage 374.
NOTE:A new engine may consume some oil during its first few
thousand miles (kilometers) of operation. This should be
considered a normal part of the break-in and not inter
-
preted as a problem.
ENGINE BREAK-IN RECOMMENDATIONS —
DIESEL ENGINE (IF EQUIPPED)
The diesel engine does not require a break-in period due
to its construction. Normal operation is allowed, providing
the following recommendations are followed:
 Warm up the engine before placing it under load.
 Do not operate the engine at idle for prolonged periods.
 Use the appropriate transmission gear to prevent
engine lugging.
 Observe vehicle oil pressure and temperature indica -
tors.
 Check the coolant and oil levels frequently.
 Vary throttle position at highway speeds when carrying
or towing significant weight.
NOTE:Light duty operation such as light trailer towing or no load
operation will extend the time before the engine is at full
efficiency. Reduced fuel economy and power may be seen
at this time.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil changes
should be consistent with anticipated climate conditions
under which vehicle operations will occur. For
recommended viscosity and quality grades see
Úpage 374. NON-DETERGENT OR STRAIGHT MINERAL
OILS MUST NEVER BE USED.
PARKING BRAKE
Before exiting the vehicle, make sure that the parking
brake is fully applied. Also, be certain to leave an
automatic transmission in PARK, or manual transmission
in REVERSE or FIRST gear.
The parking brake lever is located in the center console.
To apply the parking brake, pull the lever up as firmly as
possible. To release the parking brake, pull the lever up
slightly, push the center button, then lower the lever
completely.
CAUTION!
Never use Non-Detergent Oil or Straight Mineral Oil in
the engine or damage may result.
4

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134STARTING AND OPERATING
(Continued)

Parking Brake Lever

When the parking brake is applied with the ignition switch
ON, the Brake Warning Light in the instrument cluster will
illuminate.
NOTE:
When the parking brake is applied and the automatic
transmission is placed in gear, the Brake Warning Light
will flash. If vehicle speed is detected, a chime will
sound to alert the driver. Fully release the parking
brake before attempting to move the vehicle.
 This light only shows that the parking brake is applied.
It does not show the degree of brake application.
When parking on a hill, it is important to turn the front
wheels toward the curb on a downhill grade and away from
the curb on an uphill grade. For vehicles equipped with an
automatic transmission, apply the parking brake before
placing the gear selector in PARK, otherwise the load on
the transmission locking mechanism may make it difficult
to move the gear selector out of PARK.
MANUAL TRANSMISSION — IF EQUIPPED
WARNING!
 Never use the PARK position on an automatic trans -
mission as a substitute for the parking brake. Always
apply the parking brake fully when parked to guard
against vehicle movement and possible injury or
damage.
 When exiting the vehicle, always remove the key fob
from the ignition and lock your vehicle.
 Never leave children alone in a vehicle, or with
access to an unlocked vehicle. Allowing children to
be in a vehicle unattended is dangerous for a
number of reasons. A child or others could be seri -
ously or fatally injured. Children should be warned
not to touch the parking brake, brake pedal or the
gear selector.
 Do not leave the key fob in or near the vehicle, or in
a location accessible to children. A child could
operate power windows, other controls, or move the
vehicle.
 Be sure the parking brake is fully disengaged before
driving; failure to do so can lead to brake failure and
a collision.
 Always fully apply the parking brake when leaving
your vehicle or it may roll and cause damage or
injury. Also, be certain to leave an automatic trans -
mission in PARK, a manual transmission in REVERSE
or FIRST gear. Failure to do so may cause the vehicle
to roll and cause damage or injury.
CAUTION!
If the Brake Warning Light remains on with the parking
brake released, a brake system malfunction is
indicated. Have the brake system serviced by an
authorized dealer immediately.
WARNING!
You or others could be injured if you leave the vehicle
unattended without having the parking brake fully
applied. The parking brake should always be applied
when the driver is not in the vehicle, especially on an
incline.
CAUTION!
 Never drive with your foot resting on or partially
depressing the clutch pedal. Never attempt to hold
the vehicle on a hill with the clutch pedal partially
engaged. Operating vehicle in this manner may
cause the clutch to overheat and cause permanent
damage to the clutch. If you continue to operate the
vehicle in this manner, the “CLUTCH HOT” message
or Transmission Temperature Warning Light will be
displayed in the instrument cluster. For more infor -
mation
Úpage 116.

23_JL_OM_EN_USC_t.book Page 134

STARTING AND OPERATING135
NOTE:During cold weather, you may experience increased effort
in shifting until the transmission fluid warms up. This is
normal.

Transmission Gear Selector

To shift the gears, fully press the clutch pedal and place
the gear selector into the desired gear position (the
diagram for the engagement of the gears is displayed on
the handle of the selector). The engaged gear will be
displayed in the instrument cluster.
To engage REVERSE gear from the NEUTRAL position, lift
the REVERSE ring, located below the knob and move the
gear selector all the way left and then forward.
SHIFTING
Fully press the clutch pedal before shifting gears. As you
release the clutch pedal, lightly press the accelerator
pedal.
You should always use FIRST gear when starting from a
standing position.
NOTE:A certain amount of noise from the transmission is normal.
This noise can be most noticeable when the vehicle is
idling in NEUTRAL with the clutch engaged (clutch pedal
released), but it may also be heard when driving. The noise
may also be more noticeable when the transmission is
warm. This noise is normal and is not an indication of a
problem with your clutch or transmission.
Recommended Vehicle Shift Speeds
To utilize your manual transmission efficiently for both fuel
economy and performance, it should be upshifted as
listed in recommended shift speed chart. Shift at the
vehicle speeds listed for acceleration. When heavily
loaded or pulling a trailer, these recommended up-shift
speeds may not apply.
NOTE:Vehicle speeds shown in the chart above are for 2H and 4H only. Vehicle speeds in 4L would be significantly less.
Do not drive with your hand resting on the gear
selector as the force exerted, even if slight, over time
could lead to premature wear of the gearbox internal
components.
CAUTION!
Manual Transmission Shift Speeds in MPH (KM/H)
Engine Speeds 1 to 22 to 33 to 44 to 55 to 6
3.6L Accel.
15 (24) 24 (39)50 (80)65 (104) 70 (112)
Cruise 10 (16) 19 (31)40 (64)55 (88)65 (105)
4

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136STARTING AND OPERATING
(Continued)
DOWNSHIFTING
Moving from a high gear down to a lower gear is
recommended to preserve brakes when driving down
steep hills. In addition, downshifting at the right time
provides better acceleration when you desire to resume
speed. Downshift progressively. Do not skip gears to avoid
overspeeding the engine and clutch.
NOTE:The manual transmission shift system is equipped with
gear blockers, which will prevent downshifts into FIRST or
SECOND gear above certain vehicle speeds.
Maximum Recommended Downshift Speeds
NOTE:Vehicle speeds shown in the chart above are for 2H and 4H only, vehicle speeds in 4L would be significantly less.
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their grip,
and the vehicle could skid.
CAUTION!
Skipping gears and downshifting into lower gears at
higher vehicle speeds can damage the engine and
clutch systems. Any attempt to shift into lower gear
with clutch pedal pressed may result damage to the
clutch system. Shifting into lower gear and releasing
the clutch may result in engine damage.
 When descending a hill, be very careful to downshift
one gear at a time to prevent overspeeding the
engine which can cause engine damage, and/or
clutch damage, even if the clutch pedal is pressed. If
transfer case is in low range the vehicle speeds to
cause engine and clutch damage are significantly
lower.Failure to follow the maximum recommended down-
shifting speeds may cause the engine damage and/
or damage the clutch, even if the clutch pedal is
pressed.
 Descending a hill in low range with clutch pedal
pressed could result in clutch damage.
CAUTION!
CAUTION!
Failure to follow the maximum recommended downshifting speeds may cause the engine to overspeed and/or damage the clutch disc, even if the clutch pedal is pressed.
Manual Transmission Downshift Speeds in MPH (KM/H)
Gear Selection 6 to 55 to 44 to 33 to 22 to 1
Maximum Speed 80 (129)70 (113) 50 (81)30 (48)15 (24)

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