light RAM CHASSIS CAB 2023 Owners Manual

SERVICING AND MAINTENANCE353
PRESSURE WASHING
Cleaning the engine compartment with a high
pressure washer is not recommended.
VEHICLE MAINTENANCE
An authorized dealer has the qualified service
personnel, special tools, and equipment to
perform all service operations in an expert
manner. Service Manuals are available which
include detailed service information for your
vehicle. Refer to these Service Manuals before
attempting any procedure yourself.
NOTE:Intentional tampering with emissions control
systems may void your warranty and could result in
civil penalties being assessed against you.
ENGINE OIL
Engine Oil Selection— Gasoline Engine
Use only the manufacturer's recommended fluid
Úpage 419.
NOTE:Hemi engines (6.4L) at times can tick right after
startup and then quiet down after approximately
30 seconds. This is normal and will not harm the
engine. This characteristic can be caused by short
drive cycles. For example, if the vehicle is started
then shut off after driving a short distance. Upon
restarting, you may experience a ticking sound.
Other causes could be if the vehicle is unused for
an extended period of time, incorrect oil, extended
oil changes or extended idling. If the engine
continues to tick or if the Malfunction Indicator
Light (MIL) comes on, see the nearest authorized
dealer.
Battery gas is flammable and explosive. Keep
flame or sparks away from the battery. Do not
use a booster battery or any other booster
source with an output greater than 12 Volts.
Do not allow cable clamps to touch each
other.
Battery posts, terminals, and related accesso -
ries contain lead and lead compounds. Wash
hands after handling.
CAUTION!
It is essential when replacing the cables on
the battery that the positive cable is attached
to the positive post and the negative cable is
attached to the negative post. Battery posts
are marked positive (+) and negative (-) and
are identified on the battery case. Cable
clamps should be tight on the terminal posts
and free of corrosion.
If a “fast charger” is used while the battery is
in the vehicle, disconnect both vehicle battery
cables before connecting the charger to the
battery. Do not use a “fast charger” to provide
starting voltage.
WARNING!
CAUTION!
Precautions have been taken to safeguard all
parts and connections however, the pressures
generated by these machines is such that
complete protection against water ingress
cannot be guaranteed.
WARNING!
You can be badly injured working on or around a
motor vehicle. Only do service work for which
you have the knowledge and the proper
equipment. If you have any doubt about your
ability to perform a service job, take your vehicle
to a competent mechanic.
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358SERVICING AND MAINTENANCE
Cabin Air Filter Replacement
For the proper maintenance intervals Úpage 344.
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. With the glove compartment door open, remove the glove compartment tension tether
and tether clip by sliding the clip toward the
face of the glove compartment door. Lift the
clip out of glove compartment door and
release into dash panel.
Right Side Of Glove Compartment

3. There are travel stops on both sides of the glove compartment. Push inward on right side
of the glove compartment travel stop to
disengage the stop. Then pull the right of the
glove compartment outward (away from the
hinge) to disengaging the right side of the
compartment from the hinge. Continue by
removing the left side from the hinge by slightly
lowering the compartment while pulling
outward until it is completely disengaged from
the hinge.
Glove Compartment

4. Remove the filter cover by pushing in on the finger tabs on each end of the filter cover.

Filter Cover

WARNING!
Do not remove the cabin air filter while the
vehicle is running, or while the ignition is in the
ACC or 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 Door
2 — Glove Compartment Tension Tether1 — Glove Compartment Travel Stop
2 — Glove Compartment Tension Tether
3 — Glove Compartment Door

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360SERVICING AND MAINTENANCE
When inspecting accessory drive belts, small
cracks that run across ribbed surface of belt from
rib to rib, are considered normal. These are not a
reason to replace belt. However, cracks running
along a rib (not across) are not normal. Any belt
with cracks running along a rib must be replaced.
Also have the belt replaced if it has excessive wear,
frayed cords or severe glazing.

Accessory Belt (Serpentine Belt)

Conditions that would require replacement:
Rib chunking (one or more ribs has separated
from belt body)
Rib or belt wear
Longitudinal belt cracking (cracks between two
ribs)
Belt slips
Groove jumping (belt does not maintain correct
position on pulley)
Belt broken (identify and correct problem before
new belt is installed)
Noise (objectionable squeal, squeak, or rumble
is heard or felt while drive belt is in operation)
Some conditions can be caused by a faulty
component such as a belt pulley. Belt pulleys
should be carefully inspected for damage and
proper alignment.
Belt replacement on some models requires the
use of special tools, we recommend having your
vehicle serviced at an authorized dealer.
DRAINING FUEL/WATER SEPARATOR
F
ILTER
There are two fuel filter assemblies. One is located
on the driver's side of the engine. The best access
to this water drain valve is from under the hood.
The second one is on the under body, located in
front of the rear axle above the drive shaft on
pick-up models. The second filter location is on the
frame behind the front axle. The best access to this
water drain valve is from under the vehicle. If water is detected in the water separator while the
engine is running, or while the ignition switch is in
the ON position, the Water In Fuel Indicator Light
will illuminate and an audible chime will be heard
five times. At this point you should stop the engine
and drain the water from both of the filters.
If the Water In Fuel Indicator Light comes on and a
single chime is heard while you are driving, or with
the ignition switch in the ON position, there may be
a problem with your water separator wiring or
sensor. See an authorized dealer for service.
CAUTION!
Do not drain the fuel/water separator filter
when the engine is running.
Diesel fuel will damage blacktop paving
surfaces. Drain the filter into an appropriate
container.
CAUTION!
If the Water In Fuel Indicator Light remains on,
DO NOT START the engine before you drain water
from the fuel filters to avoid engine damage.

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SERVICING AND MAINTENANCE361
(Continued)
Upon proper draining of the water from both fuel
filters, the Water In Fuel Indicator Light will remain
illuminated for approximately 10 seconds. If the
water was drained while the engine was running,
the Water In Fuel Indicator Light may remain on for
approximately three minutes.
NOTE:Care should be taken in disposing of used fluids
from your vehicle. Used fluids, indiscriminately
discarded, can present a problem to the envi
-
ronment. Contact an authorized dealer, service
station, or government agency for advice on recy -
cling programs and for where used fluids and
filters can be properly disposed of in your area.
Drain the fuel/water separator filters when the
Water In Fuel Indicator Light is ON. Within
10 minutes of vehicle shutdown, turn the engine
mounted filter drain valve (located on the side of
the filter assembly) counterclockwise a quarter
turn, and turn the under body mounted filter drain
valve (located on the bottom of the filter assembly)
counterclockwise one full turn. Then turn the
ignition switch to the ON position, and allow any
accumulated water to drain. Leave the drain valve
open until all water and contaminants have been
removed. When clean fuel is visible, close the drain
valve following these guidelines:
1. Rotate the drain clockwise to close until you
feel resistance from the internal seal.

2. Continue turning the drain half of a turn to properly compress the seal.
NOTE:Over-compression of the seal due to overtightening
of the drain will damage the seal, cause a leak, and
require the entire sensor to be replaced.
3. Turn the ignition switch to OFF.
The sensor drain should not be overtightened
during normal service operations to avoid internal
damage and future fuel leaks. The drain should be
closed and secured without the use of tools.
If more than a couple ounces/milliliters of fuel
have been drained, follow the directions
Úpage 363
ENGINE MOUNTED FUEL FILTER
R
EPLACEMENT
NOTE:
Using a fuel filter that does not meet the manu -
facturer's filtration and water separating
requirements can severely impact fuel system
life and reliability.
The engine mounted filter housing is equipped
with a No-Filter-No-Run (NFNR) feature. Engine
will not run if:
No filter is installed.
Inferior/Non-approved filter is used. Use of
OEM filter is required to ensure vehicle will
run.

Engine Mounted Fuel Filter Assembly

1 — Drain Valve
CAUTION!
Diesel fuel will damage blacktop paving
surfaces. Drain the filter into an appropriate
container.
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364SERVICING AND MAINTENANCE
NOTE:
A maximum blend of 5% biodiesel, meeting
ASTM specification D-975 may be used with
your Cummins® diesel engine.
A maximum blend of 20% biodiesel, meeting
ASTM specification D-7467 may be used with
your Cummins® diesel engine.
Use of biodiesel mixture in excess of 20% can
negatively impact the fuel filter's ability to sepa -
rate water from the fuel, resulting in high pres -
sure fuel system corrosion or damage.
Ethanol blends are not recommended or
approved for use with your Cummins® diesel
engine.
In addition, commercially available fuel addi -
tives are not necessary for the proper operation
of your Cummins® diesel engine.
INTERVENTION REGENERATION
S
TRATEGY — MESSAGE PROCESS FLOW
The Cummins® diesel engine meets all
Environmental Protection Agency (EPA) Heavy Duty
Diesel Engine Emissions Standards, resulting in
one of the lowest emitting diesel engines ever
produced. To achieve these emissions standards, your
vehicle is equipped with a state-of-the-art engine
and exhaust system. The engine and exhaust
after-treatment system work together to achieve
the EPA Heavy Duty Diesel Engine Emissions
Standards. These systems are seamlessly
integrated into your vehicle and managed by the
Cummins® Powertrain Control Module (PCM). The
PCM manages engine combustion to allow the
exhaust system’s catalyst to trap and burn
Particulate Matter (PM) pollutants, with no input or
interaction on your part.
If the engine is allowed to idle or the truck is driven
on low engine speed drive cycles for more than two
hours, the system will automatically enter an
emissions operating mode that will increase the
engine idle speed to 1,050 RPM. While in this
mode, which is designed to help maintain the
Diesel Particulate Filter, the engine idle speed will
return to normal when the brake pedal is applied.
A small change in engine tone or a slight change in
engine performance while accelerating may also
be noticeable at speeds below 20 mph (32 km/h).
This operating mode may last for up to an hour of
idle time, or around 20 minutes of driving time.
Additionally, your vehicle has the ability to alert you
to additional maintenance required on your truck
or engine Ú
page 89.
DIESEL EXHAUST FLUID (DEF)
DEF sometimes known simply by the name of its
active component, UREA—is a key component of
Selective Catalytic Reduction (SCR) systems, which
help diesel vehicles meet stringent emission
regulations. DEF is a liquid reducing agent that
reacts with engine exhaust in the presence of a
catalyst to convert smog-forming nitrogen oxides
(NOx) into harmless nitrogen and water vapor
Úpage 419.
You can receive assistance in locating DEF by
contacting an authorized dealer.
BODY LUBRICATION
Locks and all body pivot points, including such
items as seat tracks, door hinge pivot points and
rollers, liftgate, tailgate, decklid, sliding doors and
hood hinges, should be lubricated periodically with
a lithium-based grease, such as Mopar® Spray
WARNING!
A hot exhaust system can start a fire if you park
over materials that can burn. Such materials
might be grass or leaves coming into contact
with your exhaust system. Do not park or
operate your vehicle in areas where your
exhaust system can contact anything that can
burn.

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SERVICING AND MAINTENANCE371
(Continued)
To guarantee optimum performance of the system,
keep the surfaces of the charge air cooler,
condenser and radiator clean and free of debris.
Periodically check the hoses leading to and from
the charge air cooler for cracks or loose clamps
resulting in loss of pressure and reduced engine
performance.
BRAKE SYSTEM
In order to ensure brake system performance, all
brake system components should be inspected
periodically Ú
page 344.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should be
checked when performing under the hood service
or immediately if the Brake System Warning Light
indicates system failure.
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 the fluid level can be expected to
fall as the brake linings wear. However, an
unexpected drop in fluid level may be caused by a
leak and a system check should be conducted.
For further information Ú page 421.
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 Úpage 421. 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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374SERVICING AND MAINTENANCE
REAR AXLE AND 4X4 FRONT DRIVING
A
XLE FLUID LEVEL
For normal service, periodic fluid level checks are
not required. When the vehicle is serviced for other
reasons the exterior surfaces of the axle assembly
should be inspected. If gear oil leakage is
suspected, inspect the fluid level with the vehicle
in a level position.
When checking the fluid level, the vehicle should
be in a level position. The fluid level at room
temperature should be as follows:
3500 Front Axle: ¼ inch ± ¼ inch (6.4 mm ±
6.4 mm) below the bottom of the fill hole.
3500 Rear Axle: ¼ inch ± ¼ inch (6.4 mm ±
6.4 mm) below the bottom of the fill hole.
4500/5500 Front Axle: ¼ inch +/- ¼ inch
(6.4 mm ± 6.4 mm) below the bottom of the fill
hole.
4500/5500 Rear Axle: 1/8 inch +/- 1/8 inch (3.2 mm +/- 3.2 mm) below the bottom of the fill
hole.
Drain And Refill
On 4500/5500 vehicles, remove the lower bolt to
drain the axle fluid.
4500/5500 Rear Axle Plugs

For the proper maintenance intervals Úpage 344.
Lubricant Selection
For further information Ú page 421.
NOTE:The presence of water in the gear lubricant will
result in corrosion and possible failure of differ -
ential components. Operation of the vehicle in
water, as may be encountered in some off-highway
types of service, will require draining and refilling
the axle to avoid damage.
Limited-Slip Differentials DO REQUIRE limited slip
oil additive (friction modifiers).
NOTE:Slight noise and mild shuddering may be evident
while turning a vehicle with limited slip differential
on concrete or dry pavement. These conditions
should be considered normal operation of the
limited slip differential.
TRANSFER CASE
Fluid Level Check
This fluid level can be checked by removing the
filler plug. The fluid level should be to the bottom
edge of the filler plug hole with the vehicle in a level
position.
Drain And Refill
For the proper maintenance intervals Úpage 344.
Selection Of Lubricant
Use only the manufacturer's recommended fluid
Úpage 421.
NOISE CONTROL SYSTEM REQUIRED
M
AINTENANCE & WARRANTY
All vehicles built over 10,000 lb (4,535 kg) Gross
Vehicle Weight Rating and manufactured for sale
and use in the United States are required to
comply with the Federal Government's Exterior
Noise Regulations. These vehicles can be
identified by the Noise Emission Control Label
located in the operator's compartment.
1 — 4500/5500 Rear Axle Fluid Fill Plug
2 — 4500/5500 Rear Axle Fluid Drain Plug

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SERVICING AND MAINTENANCE379
F04 50 Amp Red –400W Inverter
F05 50 Amp Red –Air Suspension Comp
F06 40 Amp Green –STOM
F07 40 Amp Green –Starter Solenoid
F08 20 Amp Blue –NOX Sensor *
F09 30 Amp Pink
–Gas – Brake Vacuum Pump *
40 Amp Green Diesel – Fuel Heater *
F10 40 Amp Green –CBC #2 / Ext Lights
F11 40 Amp Green –Brake SYS MOD ECU & Valves
F12 40 Amp Green –CBC #3 / Pwr Locks
F13 40 Amp Green –HVAC Blwr Mtr
F14 40 Amp Green –CBC #4 / Ext Light
F15 30 Amp Pink –Power Side Step *
F16 30 Amp Pink –Smart - Bar Module *
F17 30 Amp Pink –Winch *
F18 ––Spare
F19 30 Amp Pink –Diesel SCR Feed *
F20 30 Amp Pink –Passenger Door Mod
F21 30 Amp Pink –DTCM
Cavity Cartridge Fuse Micro FuseDescription
* If Equipped
8

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380SERVICING AND MAINTENANCE
F22 20 Amp Blue
–Gas – ECM *
25 Amp White Diesel – PCM *
F23 30 Amp Pink –CBC #1 / Int Light
F24 30 Amp Pink –Driver Door Mod
F25 30 Amp Pink –FT Wiper
F26 ––Spare
F27 ––Spare
F28 20 Amp Blue –TRLR Tow B / U
F29 20 Amp Blue –TRLR TOW PARK
F30 30 Amp Pink –TRLR Tow
F31 ––Spare
F32 ––Spare
F33 20 Amp Blue –Trans Control Mod *
F34 30 Amp Pink –VSIM #2 *
F35 30 Amp Pink –Sunroof *
F36 30 Amp Pink –Rear Defroster (EBL) *
F37 30 Amp Pink –Diesel Frame / Fuel HTR *
F38 30 Amp Pink –ITBM *
F39 ––Spare
F40 –10 Amp RedVented Seats *
Cavity Cartridge Fuse Micro FuseDescription
* If Equipped

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SERVICING AND MAINTENANCE381
F41 –10 Amp RedAct Grille Shutter / Dam *
F42 –20 Amp YellowHorn
F43 –15 Amp BlueHeated Strng Wheel *
F44 –10 Amp RedDiagnostic Port
F45 ––Spare
F46 –10 Amp RedUpfitters Relay Coils *
F47 ––Spare
F48 ––Spare
F49 –15 Amp BlueIP Cluster / CSG
F50 –20 Amp YellowAir Suspension Mod *
F51 –10 Amp RedIGN Mod / KINMod / RFHub
F52 –5 Amp TanBatt Snsr
F53 –20 Amp YellowTrlr Tow – Lt Turn/Stop
F54 –20 Amp YellowNon-Memory Adj Pedals *
F55 –10 Amp RedFwd Utility Lamps
F56 –10 Amp RedVBV
F57 –20 Amp YellowTCM / PCM / Trans PRSR SW
F58 –10 Amp RedBed Lighting
F59 ––Spare
F60 ––Spare
Cavity Cartridge Fuse Micro FuseDescription
* If Equipped
8

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