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2021 RAM 2500 Owners Manual - VEHICLE MAINTENANCE



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.

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

For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends engine oils that are API Certified and meet the requirements of the manufacturer Material Standard MS-12633.

Hemi engines (6.4L) at times can tick right after startup and then quiet down after approxi- mately 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 experi- ence 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.

For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends engine oils that are API CK-4 certified and meet the requirements of the manufacturer. Use Mopar® or an equivalent oil meeting the manufacturer Material Standard MS-10902. Products meeting Cummins® CES 20081 may also be used. The identification of these engine oils are typically located on the back of the oil container.

This symbol means that the oil has been certified by the American Petroleum Institute (API). The manufacturer only recommends API Certified engine oils.

This symbol certifies 0W-20, 5W-20, 0W-30, 5W-30 and 10W-30 engine oils.

 

For diesel engines, oils with a high ash content may produce damaging deposits on cylinder head valves and/or after treatment system damage. A maximum sulfated ash content of

1.00 mass % is recommended for all oil used in the engine.

The same oil change interval is to be followed for synthetic oil as for petroleum-based oil. Also, synthetic oil must meet the same performance specifications as petroleum oil.

 

You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recommended maintenance intervals for oil and filter changes are followed.

Synthetic engine oils which do not have both the engine oil certification mark and the correct SAE viscosity grade number should not be used.

The manufacturer strongly recommends against the addition of any additives (other than leak detection dyes) to the engine oil. Engine oil is an engineered product and its performance may be impaired by supplemental additives.

Care should be taken in disposing of used engine oil and oil filters from your vehicle. Used oil and oil filters, indiscriminately discarded, can present a problem to the environment. Contact an authorized dealer, service station or governmental agency for advice on how and where used oil and oil filters can be safely discarded in your area.

ENGINE OIL FILTER

The engine oil filter should be replaced with a new filter at every engine oil change.

A full-flow type disposable oil filter should be used for replacement. The quality of replacement filters varies considerably. Only high quality Mopar® certified filters should be used.

ENGINE AIR CLEANER FILTER

For the proper maintenance intervals

page 394.

 

The quality of replacement engine air cleaner filters varies considerably. Only high quality filters should be used to ensure most efficient service. Mopar® engine air cleaners are a high quality filter and are recommended.

Inspect engine air cleaner filter for dirt and or debris, if you find evidence of either dirt or

 

debris you should change your engine air cleaner filter.

When replacing the engine air cleaner filter on vehicles equipped with a 6.4L gasoline engine, replace with a dry (non-oiled) filter only.

With suitable tool fully loosen (six) fasteners on engine air cleaner filter.

— Fasteners
— Air Hose Clamp
— Engine Air Cleaner Filter Cover

 

 

Lift the engine air cleaner filter cover to access the engine air cleaner filter.
Remove the engine air cleaner filter from the housing assembly.

1 — Engine Air Cleaner Filter Cover 2 — Engine Air Cleaner Filter

 

Inspect and clean the housing if dirt or debris is present before replacing the engine air cleaner filter.

Install the engine air cleaner filter into the housing assembly with the engine air cleaner filter inspection surface facing downward.
Install the engine air cleaner filter cover onto the housing assembly.
Tighten the fasteners (six) on the engine air cleaner filter assembly

Inspect engine air cleaner filter for dirt and or debris, if you find evidence of either dirt or debris you should change your engine air cleaner filter.

 

Remove the screws from the engine air cleaner filter cover.

1 — Engine Air Cleaner Filter Cover 2 — Screws

 

Lift the engine air cleaner filter cover to access the engine air cleaner filter.
Remove the engine air cleaner filter from the housing assembly.

 

— Engine Air Cleaner Filter
— Engine Air Cleaner Filter Inspection Surface

 

Inspect and clean the housing if dirt or debris is present before replacing the engine air cleaner

filter. 8

Install the engine air cleaner into the housing assembly with the engine air cleaner filter inspection surface facing downward.
Install the engine air cleaner filter cover onto the housing assembly locating tabs.
Install screws to secure the engine air cleaner filter cover to the housing assembly.

AIR CONDITIONER MAINTENANCE

For best possible performance, your air conditioner should be checked and serviced by an authorized dealer at the start of each warm season. This service should include cleaning of the condenser fins and a performance test.

Drive belt tension should also be checked at

this time.

R-134a — (If Equipped)

R-134a Air Conditioning Refrigerant is a hydrofluorocarbon (HFC) that is an

ozone-friendly substance. The manufacturer recommends that air conditioning service be performed by an authorized dealer or other service facilities using recovery and recycling equipment.

Use only manufacturer approved A/C system PAG compressor oil and refrigerants.

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.

Use only manufacturer approved A/C system PAG compressor oil, and refrigerants.

For the proper maintenance intervals

page 394.

 

The cabin air filter is located in the fresh air inlet behind the glove compartment. Perform the following procedure to replace the filter:

Open the glove compartment and remove all contents.
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.

1 — Glove Compartment Door

 

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 disengage 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 Travel Stop
— Glove Compartment Tension Tether

 

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

 

— Glove Compartment Tension Tether
— Glove Compartment Door 1 — Finger Tabs

 

Remove the cabin air filter by pulling it straight out of the housing.

Install the cabin air filter with the arrow on the filter pointing toward the floor. When installing the filter cover, press on each end until you hear an audible click.

 

 

Reinstall the glove compartment on the hinges.
Pull the tension tether outward and reinstall the glove compartment past the travel stops by pushing in on the glove compartment sides.

— Glove Compartment Travel Stop
— Glove Compartment Tension Tether 3 — Glove Compartment Door

 

Ensure the glove compartment door hinges and glove compartment travel stops are fully engaged.

 

Reattach the glove compartment tension tether by inserting the tether clip in the glove compartment and sliding the clip away from the face of the glove compartment door.

ACCESSORY DRIVE BELT INSPECTION

 

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.

Conditions that would require replacement:

Rib chunking (one or more ribs has sepa- rated from belt body)

 

“Groove jumping" (belt does not maintain correct position on pulley)
Belt broken (note: 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 FILTER — DIESEL ENGINE

There are two fuel filter assemblies. One is located on the driver's side of the engine. The

 

 

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” remains

on, DO NOT START the engine before you 8

drain water from the fuel filters to avoid

engine damage.

Rib or belt wear

best access to this water drain valve is from

under the hood. The second one is on the under

Longitudinal belt cracking (cracks between two ribs)
Belt slips

body, located in front of the rear axle above the drive shaft on pick-up models. The Chassis Cab models 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 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.

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.

Care should be taken in disposing of used fluids from your vehicle. Used fluids, indiscriminately discarded, can present a problem to the environ- ment. 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 1/4 turn, and turn the under body mounted filter drain valve (located on the bottom of the filter assembly) counterclockwise 1 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:

Rotate the drain clockwise to close until you feel resistance from the internal seal.
Continue turning the drain 1/2 of a turn to properly compress the seal.

Over-compression of the seal due to over-tight- ening of the drain will damage the seal, cause a leak, and require the entire sensor to be replaced.

Turn the ignition switch to OFF.

The sensor drain should not be over-tightened 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 for “Priming If The Engine Has Run Out Of Fuel.”

ENGINE MOUNTED FUEL FILTER REPLACEMENT — DIESEL ENGINE

Using a fuel filter that does not meet the manufacturer's filtration and water sepa- rating 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.

1 — Drain Valve

Ensure engine is turned off.
Place drain pan under the fuel filter drain hose.
Open the water drain valve a quarter turn counterclockwise and completely drain fuel and water into the approved container.
Close the water drain valve.
Remove lid using a socket or strap wrench. Rotate counterclockwise for removal. Remove used o-ring and discard it.
Remove the used filter cartridge from the housing and dispose of according to your local regulations.
Wipe clean the sealing surfaces of the lid and housing.
Install new o-ring back into ring groove on the filter housing and lubricate with clean engine oil.
Remove new filter cartridge from plastic bag and install into housing.

 

Do not remove cartridge from bag until you reach this step in order to keep cartridge clean.

Push down on the cartridge to ensure it is properly seated. Do not pre-fill the filter housing with fuel.
Install lid onto housing and tighten to

22.5 ft lbs (30.5 N.m). Do not overtighten the lid.

Prime the engine, then start the engine and confirm there are no leaks page 418.

UNDERBODY MOUNTED FUEL FILTER REPLACEMENT — DIESEL ENGINE

Using a fuel filter that does not meet the manufacturer's filtration and water sepa- rating requirements can severely impact fuel system life and reliability.
The underbody mounted filter housing will cause the engine not to run if:
No filter is installed.

1 — Drain Valve

 

 

 

Ensure engine is turned off.
Place drain pan under the fuel filter drain hose.
Open the water drain valve one full turn counterclockwise and completely drain fuel and water into the approved container.
Close the water drain valve.
Remove lid using a socket or strap wrench. Rotate counterclockwise for removal. Remove used o-ring and discard it.
Remove the used filter cartridge from the housing and dispose of according to your local regulations.
Wipe clean the sealing surfaces of the lid and housing.
Install new o-ring back into ring groove on the filter housing and lubricate with clean engine oil.

Water In Fuel (WIF) sensor is re-usable. Service kit comes with new o-ring for filter canister and WIF sensor.

PRIMING IF THE ENGINE HAS RUN OUT OF FUEL — DIESEL ENGINE

 

Add a substantial amount of fuel to the tank, approximately 2 to 5 gal (8L to 19L).
Three priming cycles must be completed. Turn ignition to the RUN position and wait approximately 30 seconds. This will activate the in tank fuel pump. Turn the ignition switch to the off position, and leave off for at least 30 seconds. Repeat this procedure three times before cranking the engine.
Start the engine using the “Normal Starting” procedure page 140.
Once the engine starts, allow the engine to idle for a minimum of 30 seconds.

 

The engine may run rough until the air is forced from all the fuel lines.

 

 

A maximum blend of 5% biodiesel, meeting ASTM specification D-975 may be used with your Cummins® diesel engine. (Chassis Cab models not configured with B20 capability.)

 

A maximum blend of 20% biodiesel, meeting ASTM specification D-7467 may be used with your Cummins® diesel engine. (Pickup models and Chassis Cab models configured with B20 capability.)
Use of biodiesel mixture in excess of 20% can negatively impact the fuel filter's ability to separate water from the fuel, resulting in high pressure 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 opera- tion of your Cummins® diesel engine.

INTERVENTION REGENERATION STRATEGY — 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 900 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 page 111.

 

DIESEL EXHAUST FLUID

Diesel Exhaust Fluid (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

page 481.

 

You can receive assistance in locating DEF in the United States by calling 866-RAM-INFO (866-726-4636). In Canada call 1–800–465–2001 (English) or

1–800–387–9983 (French)

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 White Lube to ensure quiet, easy operation and to protect against rust and wear. Prior to the application of any lubricant, the parts concerned should be wiped clean to remove dust and grit; after lubricating, excess oil and grease should be removed. Particular attention should also be given to hood latching components to ensure proper function. When performing other underhood services, the hood latch, release mechanism and safety catch should be cleaned and lubricated.

 

The external lock cylinders should be lubricated twice a year, preferably in the Autumn and Spring. Apply a small amount of a high quality lubricant, such as Mopar® Lock Cylinder Lubricant directly into the lock cylinder.

WINDSHIELD WIPER BLADES

Clean the rubber edges of the wiper blades and the windshield periodically with a sponge or soft cloth and a mild nonabrasive cleaner. This will remove accumulations of salt or road film.

Operation of the wipers on dry glass for long periods may cause deterioration of the wiper blades. Always use washer fluid when using the wipers to remove salt or dirt from a dry windshield.

Avoid using the wiper blades to remove frost or ice from the windshield. Keep the blade rubber out of contact with petroleum products such as engine oil, gasoline, etc.

Life expectancy of wiper blades varies depending on geographical area and frequency of use. Poor performance of blades may be present with chattering, marks, water lines or

wet spots. If any of these conditions are present, clean the wiper blades or replace as necessary.

The wiper blades and wiper arms should be inspected periodically, not just when wiper performance problems are experienced. This inspection should include the following points:

Wear or uneven edges
Foreign material
Hardening or cracking
Deformation or fatigue

If a wiper blade or wiper arm is damaged, replace the affected wiper arm or blade with a new unit. Do not attempt to repair a wiper arm or blade that is damaged.

 

Lift the wiper arm to raise the wiper blade off of the glass, until the wiper arm is in the full up position.

— Wiper
— Locking Tab 3 — Wiper Arm

 

 

To disengage the wiper blade from the wiper arm, flip up the locking tab.

— Wiper
— Locking Tab

 

8

 

Tilt the lower end of the wiper blade away from the arm and use one finger to push the release tab toward the wiper arm.

1 — Locking Tab 2 — Wiper

3 — Release Tab

 

Slide the wiper blade down towards the base of the wiper arm.
With the wiper blade disengaged, remove the wiper blade from the wiper arm by holding the wiper arm with one hand and separating the wiper blade from the wiper arm with the other hand (move the wiper

 

blade down toward the base of the wiper arm and away from the J hook in the end of the wiper arm).

— Wiper
— Locking Tab
— Wiper Arm J Hook

 

Gently lower the wiper arm onto the glass.
Lift the wiper arm off of the glass, until the wiper arm is in the full up position.
Position the wiper blade under the hook on the tip of the wiper arm with the wiper locking tab open.

 

Insert the receiver bracket on the wiper assembly into the hook on the tip of the arm through the opening in the wiper blade under the locking tab.
Slide the wiper blade up into the hook on the wiper arm until it is latched (engagement will be accompanied by an audible click). Fold down the latch release tab and snap it into its locked position.
Gently lower the wiper blade onto the glass.

EXHAUST SYSTEM

The best protection against carbon monoxide entry into the vehicle body is a properly maintained engine exhaust system.

If you notice a change in the sound of the exhaust system; or if the exhaust fumes can be detected inside the vehicle; or when the underside or rear of the vehicle is damaged; have an authorized technician inspect the complete exhaust system and adjacent body areas for broken, damaged, deteriorated, or mispositioned parts. Open seams or loose connections could permit exhaust fumes to seep into the passenger compartment. In

addition, have the exhaust system inspected each time the vehicle is raised for lubrication or oil change. Replace as required.

 

 

Under normal operating conditions, the catalytic converter will not require maintenance. However, it is important to keep the engine properly tuned to ensure proper catalyst operation and prevent possible catalyst damage.

Intentional tampering with emissions control systems can result in civil penalties being assessed against you.

 

In unusual situations involving grossly malfunctioning engine operation, a scorching odor may suggest severe and abnormal catalyst overheating. If this occurs, stop the vehicle, turn off the engine and allow it to cool. Service, including a tune-up to manufacturer's specifications, should be obtained immediately.

To minimize the possibility of catalytic converter damage:

Do not interrupt the ignition when the trans- mission is in gear and the vehicle is in motion.
Do not try to start the vehicle by pushing or towing the vehicle.
Do not idle the engine with any ignition components disconnected or removed, such as when diagnostic testing, or for prolonged

periods during very rough idle or malfunc- 8

tioning operating conditions.

(Continued)

COOLING SYSTEM

 

Check the engine coolant (antifreeze) protection every 12 months (before the onset of freezing weather, where applicable). If the engine coolant is dirty or rusty in appearance,

 

the system should be drained, flushed and refilled with fresh coolant. Check the front of the A/C condenser or radiator for any accumulation of bugs, leaves, etc. If dirty, clean by gently spraying water from a garden hose vertically down the face of the A/C condenser or the back of the radiator core.

Check the engine cooling system hoses for brittle rubber, cracking, tears, cuts and tightness of the connection at the coolant recovery bottle and radiator. Inspect the entire system for leaks.

DO NOT REMOVE THE COOLANT PRESSURE CAP WHEN THE COOLING SYSTEM IS HOT.

Some vehicles require special tools to add coolant properly. Failure to fill these systems properly could lead to severe internal engine damage. If any coolant is needed to be added to the system please contact an authorized dealer.

If the engine coolant (antifreeze) is dirty or contains visible sediment, have an authorized dealer clean and flush with Organic Additive

 

Technology (OAT) coolant (conforming to MS.90032).

For the proper maintenance intervals

page 394.

For further information page 481. NOTE:

Mixing of engine coolant (antifreeze) other than specified Organic Additive Technology (OAT) engine coolant, may result in engine damage and may decrease corrosion protec- tion. OAT engine coolant is different and should not be mixed with Hybrid Organic Additive Technology (HOAT) engine coolant or any “globally compatible” coolant. If a

non-OAT engine coolant is introduced into the cooling system in an emergency, the cooling system will need to be drained, flushed, and refilled with fresh OAT coolant (conforming to MS.90032), by an authorized dealer as soon as possible.

Do not use water alone or alcohol-based engine coolant products. Do not use addi- tional rust inhibitors or antirust products, as they may not be compatible with the radiator engine coolant and may plug the radiator.
This vehicle has not been designed for use with propylene glycol-based engine coolant. Use of propylene glycol-based engine coolant is not recommended.
Some vehicles require special tools to add coolant properly. Failure to fill these systems properly could lead to severe internal engine damage. If any coolant is needed to be added to the system please contact an authorized dealer.

Your vehicle has been built with an improved engine coolant (OAT coolant conforming to MS.90032) that allows extended maintenance intervals. This engine coolant (antifreeze) can be used up to ten years or 150,000 miles (240,000 km) before replacement. To prevent reducing this extended maintenance period, it is important that you use the same engine coolant (OAT coolant conforming to MS.90032) throughout the life of your vehicle.

Please review these recommendations for using Organic Additive Technology (OAT) engine coolant that meets the requirements of the manufacturer Material Standard MS.90032. When adding engine coolant:

 

We recommend using Mopar® Antifreeze/ Coolant 10 Year/150,000 Mile (240,000 km) Formula OAT that meets the requirements of the manufacturer Material Standard MS.90032.
Mix a minimum solution of 50% OAT engine coolant that meets the requirements of the manufacturer Material Standard MS.90032 and distilled water. Use higher concentra- tions (not to exceed 70%) if temperatures below −34°F (−37°C) are anticipated. Please contact an authorized dealer for assistance.
Use only high purity water such as distilled or deionized water when mixing the water/ engine coolant (antifreeze) solution. The use of lower quality water will reduce the amount of corrosion protection in the engine cooling system.
It is the owner's responsibility to maintain the proper level of protection against freezing according to the temperatures occurring in the area where the vehicle is operated.

 

Some vehicles require special tools to add coolant properly. Failure to fill these systems properly could lead to severe internal engine damage. If any coolant is needed to be added to the system, please contact a local autho- rized dealer.
Mixing engine coolant types is not recom- mended and can result in cooling system damage. If HOAT and OAT coolant are mixed in an emergency, have an authorized dealer drain, flush, and refill with OAT coolant (conforming to MS.90032) as soon as possible.

The cap must be fully tightened to prevent loss of engine coolant (antifreeze), and to ensure that engine coolant will return to the radiator

from the coolant expansion bottle/recovery 8

tank if so equipped.

The cap should be inspected and cleaned if there is any accumulation of foreign material on the sealing surfaces.

 

Used ethylene glycol-based coolant (antifreeze) is a regulated substance requiring proper disposal. Check with your local authorities to determine the disposal rules for your community. To prevent ingestion by animals or children, do not store ethylene glycol-based coolant in open containers or allow it to remain in puddles on the ground. If ingested by a child or pet, seek emergency assistance immediately. Clean up any ground spills immediately.

The level of the coolant in the pressurized coolant bottle should be between the “MIN” and “MAX” range on the bottle when the engine is cold.

The radiator normally remains completely full, so there is no need to remove the cap unless checking for coolant freeze point or replacing engine coolant (antifreeze). Advise your service attendant of this. As long as the engine operating temperature is satisfactory, the coolant bottle need only be checked once a month. When additional engine coolant is needed to maintain the proper level, it should be added to the coolant bottle. Do not overfill.

When the vehicle is stopped after a few miles/ kilometers of operation, you may observe vapor coming from the front of the engine compart- ment. This is normally a result of moisture from rain, snow, or high humidity accumulating on the radiator and being vaporized when the ther- mostat opens, allowing hot engine coolant (anti- freeze) to enter the radiator.

 

If an examination of your engine compartment shows no evidence of radiator or hose leaks, the vehicle may be safely driven. The vapor will soon dissipate.

Do not overfill the coolant expansion bottle.
Check the coolant freeze point in the radiator and in the coolant expansion bottle. If engine coolant needs to be added, the contents of the coolant expansion bottle must also be protected against freezing.
If frequent engine coolant additions are required, the cooling system should be pres- sure tested for leaks.
Maintain engine coolant concentration at a minimum of 50% OAT coolant (conforming to MS.90032) and distilled water for proper corrosion protection of your engine which contains aluminum components.
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

necessary, install ONLY the correct type ther- mostat. Other designs may result in unsatis- factory engine cooling performance, poor gas mileage, and increased emissions.

CHARGE AIR COOLER — INTER-COOLER

The charge air cooler is positioned below the radiator and the air conditioner condenser. Air enters the engine through the air cleaner and passes through the turbocharger, where it is pressurized. This pressurized air rapidly reaches high temperature. The air is then directed through a hose to the charge air cooler and through another hose to the intake manifold of the engine. The air entering the engine has been cooled by about 50° to 100°F (10° to 38°C). This cooling process enables more efficient burning of fuel resulting in fewer emissions.

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 page 394.

 

The fluid level of the master cylinder should be checked when performing under the hood service or immediately if the brake system warning lamp 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 page 485.

8

(Continued)

transmissions. Avoid using transmission sealers as they may adversely affect seals.

AUTOMATIC TRANSMISSION

The manufacturer strongly recommends against using any special additives in the transmission. Automatic Transmission Fluid (ATF) is an engineered product and its performance may be impaired by supplemental additives. Therefore, do not add any fluid additives to the transmission. The only exception to this policy is the use of special dyes for diagnosing fluid leaks in six-speed

 

The fluid level is preset at the factory and does not require adjustment under normal operating conditions. Routine fluid level checks are not required, therefore the transmission has no dipstick. An authorized dealer can check your transmission fluid level using special service tools.

If you notice fluid leakage or transmission malfunction, visit an authorized dealer immediately to have the transmission fluid level checked. Operating the vehicle with an improper fluid level can cause severe transmission damage.

It is best to check the fluid level when the transmission is at normal operating temperature (158-176°F / 70-80°C). This normally occurs after at least 15 miles (25 km) of driving. At normal operating temperature the fluid cannot be held comfortably between the fingertips. You can read the transmission sump temperature in the instrument cluster screen page 111.

Use the following procedure to check the transmission fluid level properly:

Monitor the transmission temperature using the instrument cluster display, and operate the vehicle as required to reach the normal operating temperature. If the transmission is not functioning properly, or

the vehicle cannot be driven, see the NOTE and CAUTION below about checking the fluid level at colder temperatures.

Park the vehicle on level ground.
Run the engine at normal idle speed for at least 60 seconds, and leave the engine running for the rest of this procedure.
Fully apply the parking brake, and press the brake pedal.
Place the gear selector momentarily into each gear position (allowing time for the transmission to fully engage in each position), ending with the transmission in PARK.
Remove the dipstick, wipe it clean and reinsert it until seated.
Remove the dipstick again and note the fluid level on both sides. The fluid level reading is only valid if there is a solid coating of oil on both sides of the dipstick. Note that the holes in the dipstick will be full of fluid if the actual level is at or above the hole. The fluid level should be between the “HOT” (upper) reference holes on the dipstick at normal operating temperature. If

 

the fluid level is low, add fluid through the dipstick tube to bring it to the proper level. Do not overfill. Use ONLY the specified fluid page 485. After adding any quantity of oil through the dipstick tube, wait a minimum of two minutes for the oil to fully drain into the transmission before rechecking the fluid level.

If it is necessary to check the transmission below the operating temperature, the fluid level should be between the two “COLD” (lower) holes on the dipstick with the fluid at 60-70°F / 16-21°C. Only use the COLD region of the dipstick as a rough reference when setting the fluid level after a transmission service or fluid change. Re-check the fluid level, and adjust as required, once the transmission reaches normal operating temperature.

 

 

Reinsert the dipstick. Check for leaks. Release the parking brake.

If it is necessary to check the transmission below the operating temperature, the fluid level should be between the two COLD (lower) holes on the dipstick with the fluid at 68-86°F /

20-30°C. Only use the COLD region of the dipstick as a rough reference when setting the fluid level after a transmission service or fluid change. Re-check the fluid level, and adjust as required, once the transmission reaches normal operating temperature.

8

Under normal operating conditions, the fluid installed at the factory will provide satisfactory lubrication for the life of the vehicle.

Routine fluid and filter changes are not required. However, change the fluid and filter if the fluid becomes contaminated (with water, etc.), or if the transmission is disassembled for any reason.

For the proper maintenance intervals

page 394.

In addition, change the fluid and filters if the fluid becomes contaminated (with water, etc.), or if the transmission is disassembled for any reason.

It is important to use the proper transmission fluid to ensure optimum transmission performance and life. Use only the manufacturer’s specified transmission fluid page 485. It is important to maintain the

transmission fluid at the correct level using the

 

recommended fluid. No chemical flushes should be used in any transmission; only the approved lubricant should be used.

 

REAR AXLE AND 4X4 FRONT DRIVING AXLE 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

page 485. This inspection should be made

with the vehicle in a level position.

To check the axle fluid, park the vehicle on a level surface. Take a piece of wire (or zip tie) and make a 90 degree bend two inches from the end of the wire. Insert the wire into the fill

 

plug hole and use it like a dipstick. Remove the wire and measure from the 90 degree bend to the oil level.

For the 2500 (Non-Power Wagon) axles, the fluid level should be 4/5 in ± 1/4 in (20.3 mm

± 6.4 mm) below the fill hole for the rear axle and it should be 1/4 in ± 1/4 in (6.4 mm ±

6.4 mm) below the fill hole on the front axle.

For the 2500 Power Wagon and all 3500 model axles, the fluid level should be 1/4 in ± 1/4 in (6.4 mm ± 6.4 mm) below the fill hole on the

in front, 11.5 in rear axle, and 12.0 in rear axle.

For the proper maintenance intervals

page 394.

For further information page 485.

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).

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 opera- tion of the limited slip differential.

TRANSFER CASE

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.

For the proper maintenance intervals

page 394.

Use only the manufacturer's recommended fluid page 485.

NOISE CONTROL SYSTEM REQUIRED MAINTENANCE & WARRANTY

All vehicles built over 10,000 lbs. (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.

The following maintenance services must be performed every six months or 7,500 miles (12,000 km) whichever comes first, to ensure proper operation of the noise control systems.

 

In addition, inspection and service should be performed anytime a malfunction is observed or suspected. Proper maintenance of the entire vehicle will help the effectiveness of the noise control systems.

Inspect the entire exhaust system for leaks and damaged parts. Devices such as hangers, clamps, and U-bolts should be tight and in good condition. Damaged components, burned or blown out mufflers, burned or rusted out exhaust pipes should be replaced according to the procedures and specifications outlined in the appropriate service manual.

Inspect air cleaner housing for proper assembly and fit. Make certain that the air cleaner is

properly positioned and that the cover is tight. 8

Check all hoses leading to the air cleaner for

tightness. The air filter element must also be clean and serviced according to the instructions outlined in the Scheduled Maintenance section of this manual.

Federal law prohibits the following acts or the causing thereof: (1) the removal or rendering inoperative by any person, other than for purposes of maintenance, repair, or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control prior to its sale or delivery to the ultimate purchaser or while it is in use, or (2) the use of the vehicle after such device or element of design has been removed or rendered inoperative by any person.

Among those acts presumed to constitute tampering are the acts listed below.

 

Removal of the air cleaner.
Removal of the air cleaner filter element from the air cleaner housing.
Removal of the air ducting. EXHAUST SYSTEM
Removal or rendering inoperative exhaust

system components including the muffler or tailpipe.

Removal or rendering inoperative the fan clutch.
Removal of the fan shroud.

The manufacturer warrants that this vehicle as manufactured by the manufacturer, was designed, built and equipped to conform at the time it left the manufacturer's control with all applicable U.S. EPA Noise Control Regulations.

This warranty covers this vehicle as designed, built and equipped by the manufacturer, and is not limited to any particular part, component or system of the vehicle manufactured by the manufacturer. Defects in design, assembly or in any part, component or system of the vehicle as manufactured by the manufacturer, which, at the time it left the manufacturer's control, caused noise emissions to exceed Federal standards, are covered by this warranty for the life of the vehicle.

Maintenance Log and Service Chart (Diesel Engines)

8

FUSES

 

Also, please be aware that when using power outlets for extended periods of time with the engine off may result in vehicle battery discharge.

(Continued)

 

The fuses protect electrical systems against excessive current.

When a device does not work, you must check the fuse element inside the blade fuse for a break/melt.

— Fuse Element
— Blade Fuse with a good/functional fuse element
— Blade fuse with a bad/not functional fuse element (blown fuse)

 

The Power Distribution Center is located in the engine compartment near the battery. This center contains cartridge fuses, micro fuses, relays, and circuit breakers. A description of each fuse and component may be stamped on the inside cover, otherwise the cavity number of each fuse is stamped on the inside cover that corresponds to the following chart.

 

Cavity

Cartridge Fuse

Micro Fuse

Description

F01

Spare

F02

60 Amp Yellow

ABS Pump Motor (HD Only)

F03

60 Amp Yellow

Rad Fan *

F04

50 Amp Red

 

400W Inverter *

Cavity

Cartridge Fuse

Micro Fuse

Description

F05

40 Amp Green

Compressor For Air Suspension *

F06

40 Amp Green

Steering Torque Overlay Module (STOM)

F07

40 Amp Green

Starter Solenoid

F08

20 Amp Blue

NOX Sensor*

F09

40 Amp Green

Diesel / Fuel Heater *

F09

30 Amp Pink

Gas / Brake Vacuum Pump *

F10

40 Amp Green

CBC #2 / Ext Lights

F11

40 Amp Green

Brake System Module (ECU and Valves)

F12

40 Amp Green

CBC #3 / Pwr Locks

F13

40 Amp Green

Blower Motor

F14

40 Amp Green

CBC #4 / Ext Lights

F15

30 Amp Pink

Power Side Steps *

F16

30 Amp Pink

Smart-Bar Module *

F17

30 Amp Pink

Winch Control Module *

F19

30 Amp Pink

Diesel SCR Feed *

F20

30 Amp Pink

Passenger Door Module

F21

30 Amp Pink

Drive Train Control Module

F22

20 Amp Blue

Gas / ECM *

F22

25 Amp White

Diesel PCM *

F23

30 Amp Pink

CBC #1 / Int Light

 

 

Cavity

Cartridge Fuse

Micro Fuse

Description

F44

10 Amp Red

Diagnostic Port

F46

10 Amp Red

Upfitters Relay Coil *

F47

Spare

F48

Spare

F49

10 Amp Red

IP Cluster / CSG

F50

20 Amp Yellow

Air Suspension Control Module *

F51

10 Amp Red

Ignition Node Module / Keyless Ignition Node Module, Radio Frequency Hub Module / Electric Steering Column Lock *

F52

5 Amp Tan

Battery Sensor

F53

20 Amp Yellow

Trailer Tow – Left Turn/Stop Lights *

F54

20 Amp Yellow

Non Memory Adjustable Pedals *

F55

Spare

F56

10 Amp Red

Fuel Vapor Blocker Valve *

F57

20 Amp Yellow

TCM / PCM / Solenoid Trans Pressure SW (RFE Trans Only) *

F58

10 Amp Red

Bed Lighting (LED) *

F60

Spare

F61

10 Amp Red

NH3 Sensor / PM Sensor *

F62

10 Amp Red

Air Conditioning Clutch

F63

20 Amp Yellow

Ignition Coils / CAPS

 

 

Cavity

Cartridge Fuse

Micro Fuse

Description

F83

Spare

F84

15 Amp Blue

ASBM / HVAC / ICS / Rear Heated Seat Switches

F85

10 Amp Red

Airbag Module

F86

10 Amp Red

Airbag Module

F87

10 Amp Red

Air Suspension / ITBM / Steering Column Control Module / MOD Gateway CAN-C Trailer TPM

F88

15 Amp Blue

Instrument Panel Cluster

F90/F91

20 Amp Yellow

Power Outlet / Batt

Power Outlet / Acc

F92

Spare

F93

Spare

F94

10 Amp Red

Shift-By-Wire / Transfer Case Switch / Module TPM Trailer / Module Gateway Can-C Trailer TPM

F95

10 Amp Red

Rearview Camera / Park Assist / CHMSL Camera / Blind Spot Sensor / Surround View Camera

F96

10 Amp Red

Trailer Camera *

F97

20 Amp Yellow

Front Heated Seat Passenger *

F98

20 Amp Yellow

Front Heated Seat Driver *

F99

10 Amp Red

HVAC / In-Car Temperature Sensor / CSG MOD

F100

10 Amp Red

Upfitters Box Feed *

F101

20 Amp Yellow

Rear Heated Seat Right *

Cavity

Cartridge Fuse

Micro Fuse

Description

F102

20 Amp Yellow

Rear Heated Seat Left / Run RLY #3 Coil *

F103

10 Amp Red

HeadLamp AFLS *

F104

20 Amp Yellow

UCI Port / USB Rear

* If Equipped

CAUTION!

When installing the power distribution center cover, it is important to ensure the cover is properly positioned and fully latched. Failure to do so may allow water to get into the power distribution center and possibly result in an electrical system failure.
When replacing a blown fuse, it is important to use only a fuse having the correct amperage rating. The use of a fuse with a rating other than indi- cated may result in a dangerous electrical system overload. If a properly rated fuse continues to blow, it indicates a problem in the circuit that must be corrected.

 

See an authorized dealer for LED bulb replacement.

All of the inside bulbs are brass or glass-wedge base. Aluminum base bulbs are not approved.

Interior Bulbs

Bulb Name

Bulb Number

Overhead Console Lamps

TS 212–9

Dome Lamp

7679

For lighted switches, see an authorized dealer for replacement instructions.

Exterior Bulbs

Bulb Name

Bulb Number

Low Beam (Halogen Reflector Headlamp)

H11LL

High Beam (Halogen Reflector Headlamp)

9005LL

Low & High Beam (LED Reflector Headlamp)

LED (Serviced at an authorized dealer)

Low & High Beam (LED Projector Headlamp)

LED (Serviced at an authorized dealer)

Turn Signal / Front Position (Halogen Reflector Headlamp)

7444NA

Turn Signal (LED Projector Headlamp)

LED (Serviced at an authorized dealer)

Front Position (LED Headlamps)

LED (Serviced at an authorized dealer)

 

Base Quad: Low Beam Headlamp, High Beam Headlamp, Front Park And Turn — If Equipped

Low Beam

See below steps to replace:

Open the hood.
Disconnect and isolate the negative battery cable.
Reach into the front wheel house ahead of the front wheel, remove the fastener, and lift the cover over the access hole in the front of the wheel house splash shield. Access to the rear of the lamp can be gained through this access hole.

 

Reach through the access hole of the wheel house splash shield and disengage the bulb access cover by rotating counterclockwise.

Disconnect the internal lamp wiring harness connector from the low beam bulb.

 

Rotate the bulb counterclockwise a quarter turn to unlock the bulb from the lamp.
Pull the bulb straight out from the housing.
Reverse the procedure for installation of new bulb and covers.

See below steps to replace:

Open the hood.
Disconnect and isolate the negative battery cable.

Look under the hood and behind the headlamp to find the high beam bulb access cover.
Reach behind the headlamp and disengage the access cover by rotating counter- clockwise.
Disconnect the internal lamp wiring harness connector from the high beam bulb.

 

Rotate the bulb counterclockwise a quarter turn to unlock the bulb from the lamp.
Pull the bulb straight out from the housing.
Reverse the procedure for installation of new bulb and covers.

 

Outer Front Park And Turn See below steps to replace:

Open the hood.
Disconnect and isolate the negative battery cable.
Reach into the front wheel house ahead of the front wheel, remove the fastener, and lift the cover over the access hole in the front of the wheel house splash shield. Access to the rear of the lamp can be gained through this access hole.

 

Reach through the access hole of the wheel house splash shield and disengage the side marker socket by rotating counterclockwise a quarter turn.

Pull the socket and bulb straight out from the housing.
Separate the bulb from the socket without 8

twisting.

Reverse the procedure for installation of new bulb and covers.

Fog Lamps — If Equipped

Please see an authorized dealer for service on LED and Halogen front fog lamps.

See below steps to replace:

Reach under and behind the front fascia/ bumper to access the back of the front fog lamp housing.
Disconnect the fog lamp wiring harness connector from the fog lamp bulb.
Rotate the bulb counterclockwise a quarter turn to unlock the bulb from the housing.

 

 

Rear Tail/Stop, Turn Signal And Backup Lamps See below steps to replace:

Remove the two screws and push pins that pass through the bed sheet metal.

 

Pull the outboard side of the lamp rearward far enough to unsnap the two receptacles on the outboard side of the lamp housing from the two plastic snap post retainers in the outer box side panel.

Disconnect the wiring harness connectors from the bulb socket.
Rotate the bulb socket counterclockwise a quarter turn to unlock it from the housing.
Pull the bulb straight out of the socket.

4. Pull the bulb straight out from the housing.

1 — Tail Lamp 2 — Screws

3 — Fasteners

 

 

6. Reverse the procedure to install the bulb and housing.

Center High Mounted Stop Lamp (CHMSL) With Cargo Lamp

See below steps to replace:

Remove the two screws holding the housing/lens to the body as shown.

 

Separate the connector holding the housing and wiring harness to the body.
Turn the desired bulb socket a quarter turn and remove the socket and bulb from housing.
Pull the desired bulb straight from the socket.

 

 

Outside Bulbs: Cargo Lamps
Inside Bulb: Center High Mounted Stop Lamp
Reverse the procedure for installation of bulbs and housing.

Cab Top Clearance Lamps — If Equipped See below steps to replace:

Remove the screws from the top of the lamp.

8

Rotate the bulb socket a quarter turn and pull it from the lamp assembly.

Pull the bulb straight from it's socket and replace.

 

Rear Lamp Bar ID Marker (Dual Rear Wheels)

— If Equipped

See below steps to replace:

Loosen the two screws and the housing to gain access to the bulb sockets.

Turn the socket a quarter turn counter- clockwise to access the bulb.
Pull the bulb straight out from the socket.
Reverse the procedure for installation of the bulbs and housing.

 

Side Marker Lamps (Dual Rear Wheels) — If Equipped

See below steps to replace:

Push rearward on the side marker lamp assembly.
Pull the entire assembly from the fender.
Turn the socket a quarter turn counter- clockwise and remove from assembly to access the bulb.
Pull the bulb straight out from socket.
Reverse the procedure for installation of the bulbs and housing.

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