mileage RAM CHASSIS CAB 2021 Owners Manual

104GETTING TO KNOW YOUR INSTRUMENT PANEL

refill the tank when this message is initially
displayed on pickup applications, and approxi-
mately 7 gallons (26 Liters) are required on
chassis-cab applications.
Speed Limited to 5 MPH in XXX mi Refill DEF —
This message will continuously display if the
“DEF Low Refill Soon” message is ignored, and
the frequency of occurrence of the chime will
increase unless up to 2 gallons (7.5 Liters) of
DEF is added to the tank.
5 MPH Max Speed on Restart, Long Idle or
Refuel Refill DEF — This message will continu -
ously display when the counter reaches zero,
and will be accompanied by a periodic chime.

The vehicle will only be capable of a
maximum speed of 5 mph upon the first of
the following conditions to occur:
If the vehicle is shutoff and restarted.

If the vehicle is idled for an extended period
of time, approximately one hour or greater.

If the system detects that the level of fuel
in the tank has increased.

Add a minimum of 2 gallons (7.5 Liters) of DEF
to the tank in order to avoid vehicle operation
at a maximum speed of 5 mph (8 km/h).
NOTE:
A minimum of 2 gallons (7.5 Liters) may be
required to restore normal vehicle operation.
Although the vehicle will start normally and can
be placed in gear after this message has been
initially displayed, extreme caution should be
utilized since the vehicle will only be capable of
maneuvering at a maximum speed of 5 mph
(8 km/h).
Diesel Exhaust Fluid (DEF) Fault Warning
Messages
There are five different messages which are
displayed if the vehicle detects that the DEF
system has been filled with a fluid other than
DEF, has experienced component failures, or
when tampering has been detected. The vehicle
may be limited to a maximum speed of 5 mph
(8 km/h) if the DEF system is not serviced
within less than 200 miles (322 km) of the fault
being detected.
When the DEF system needs to be serviced the
following warnings will display:
Service DEF System See Dealer
— This
message will display when the fault is initially
detected, each time the vehicle is started,
and periodically during driving. The message will be accompanied by a single chime. We
recommend you drive to the nearest autho
-
rized dealer and have your vehicle serviced
as soon as possible.

5 MPH Max Speed in 150 mi Service DEF
System See Dealer — This message will display
if the DEF system has not been serviced after
the “Service DEF System – See Dealer”
message is displayed. This message will
continuously display until the mileage counter
reaches zero, and will be accompanied by a
periodic chime. The message will continue to
countdown until it reaches zero unless the
vehicle is serviced. We recommend you drive
to your nearest authorized dealer and have
your vehicle serviced immediately.

NOTE:
Under some circumstances this mileage
counter may start with a value of less than
150 miles (241 km). For example, if recurring faults are detected in a time interval of less
than 40 hours, the counter may restart at the
value where it stopped when a previous fault
was temporarily remedied, or at a minimum of
50 miles (80 km).

21_DPF_OM_EN_USC_t.book Page 104

GETTING TO KNOW YOUR INSTRUMENT PANEL105
5 MPH Max Speed on Restart, Long Idle
or Refuel Service DEF See Dealer — This
message will continuously display when the
mileage counter reaches zero, and will be
accompanied by a periodic chime.
The vehicle will only be capable of a
maximum speed of 5 mph upon the first of
the following conditions to occur:
If the vehicle is shutoff and restarted.
If the vehicle is idled for an extended
period of time, approximately one hour
or greater.
If the system detects that the level of fuel
in the tank has increased.
5 MPH Max Speed Service DEF System See
Dealer — This message will continuously
display, and will be accompanied by a peri -
odic chime. Although the vehicle can be
started and placed in gear, the vehicle will
only operate at a maximum speed of 5 mph.
Your vehicle will require towing, see an
authorized dealer for service.
NOTE:
When this message is displayed, the engine can
still be started. However, the vehicle will only
operate at a maximum speed of 5 mph.
Incorrect DEF Detected See Dealer — This
message will display when the fault is initially
detected, each time the vehicle is started,
and periodically during driving. The message
will be accompanied by a single chime.
We recommend you drive to the nearest
authorized dealer and have your vehicle
serviced as soon as possible.
RAM Active Air System

Your vehicle is equipped with an advanced
Ram Active Air system that provides enhanced
performance, especially when towing under
demanding hot or high altitude conditions. If the
instrument cluster display displays the message
“Active Airbox Service Required See Dealer”, vehicle
performance may be reduced until service is
performed by an authorized RAM dealer.

BATTERY SAVER ON/BATTERY SAVER
M
ODE MESSAGE — ELECTRICAL LOAD
R
EDUCTION ACTIONS — IF EQUIPPED
This vehicle is equipped with an Intelligent
Battery Sensor (IBS) to perform additional
monitoring of the electrical system and status
of the vehicle battery. In cases when the IBS detects charging system
failure, or the vehicle battery conditions are
deteriorating, electrical load reduction actions
will take place to extend the driving time and
distance of the vehicle. This is done by reducing
power to or turning off non-essential electrical
loads.
Load reduction is only active when the engine is
running. It will display a message if there is a
risk of battery depletion to the point where the
vehicle may stall due to lack of electrical supply,
or will not restart after the current drive cycle.
When load reduction is activated, the message
“Battery Saver On Some Systems May Have
Reduced Power” will appear in the instrument
cluster.
These messages indicate the vehicle battery
has a low state of charge and continues to lose
electrical charge at a rate that the charging
system cannot sustain.
3

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SERVICING AND MAINTENANCE355
Mileage or time passed (whichever comes first)
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
110,000
120,000
130,000
140,000
150,000
Or Years: 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
32,000
48,000
64,000
80,000
96,000
112,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000
Additional Inspections
Inspect the CV/Universal joints. X X X X X X X X X X X X X X
Inspect front suspension, tie rod ends, and replace if necessary. X X X X X X X
Inspect the front and rear axle surfaces. If gear oil leakage is
suspected, check the fluid level. If using your vehicle for police,
taxi, fleet, off-road or frequent trailer towing, change axle fluid. X X X X X X X
Inspect the brake linings, parking brake function. X X X X X X X
Additional Maintenance
Replace the cabin air filter. X X X X X X X
Replace the engine air cleaner filter. XXXXX
Replace spark plugs.
1X
Flush and replace the engine coolant at 10 years or
150,000 miles (240,000 km) whichever comes first. X
X

Change the automatic transmission fluid (AS66RC Transmission Only).
XXX
8

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356SERVICING AND MAINTENANCE
(Continued)
Change the automatic transmission fluid and sump filter
(AS66RC Transmission Only). X
X
Inspect the transfer case fluid, change for any of the following:
police, taxi, fleet, or frequent trailer towing. X
XXXX
Change the transfer case fluid. X
Inspect and replace PCV valve if necessary. X
1. The spark plug change interval is mileage based only, yearly intervals do not apply.
Mileage or time passed (whichever comes first)
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
110,000
120,000
130,000
140,000
150,000
Or Years: 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
32,000
48,000
64,000
80,000
96,000
112,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000
WARNING!
You can be badly injured working on or
around a motor vehicle. Do only service
work for which you have the knowledge and
the right equipment. If you have any doubt
about your ability to perform a service job,
take your vehicle to a competent mechanic.
Failure to properly inspect and maintain your
vehicle could result in a component malfunc -
tion and effect vehicle handling and perfor -
mance. This could cause an accident.

WARNING! (Continued)

21_DPF_OM_EN_USC_t.book Page 356

SERVICING AND MAINTENANCE359
MAINTENANCE PLAN — CUMMINS DIESEL ENGINE
Mileage or time passed
(whichever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114
120

Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
Change engine oil every
15,000 miles (24,000 km) or
12 months or 500 hours or
sooner if prompted by the oil
change indicator system,
whichever comes first.
1
X X X X X X X X X X
Additional Inspections
Check the Diesel Exhaust Fluid
(DEF) tank, refill if necessary. X X X X X X X X X X X X X X X X X X X X
Rotate the tires. X X X X X X X X X X X X X X X X X X X X

Inspect the CV/Universal joints.
X X X X X X X X X X X X X X X
X X X X X
Insp e

ct front end, and
lubricate — If equipped with
serviceable fittings. X X X X X X X X X X X X X X X X X X X X
8

21_DPF_OM_EN_USC_t.book Page 359

360SERVICING AND MAINTENANCE
Inspect engine air cleaner
filter, replace if necessary. 2X X X X X X X X X X
Inspect the front suspension,
tie rod ends and boot seals for
cracks or leaks and all parts
for damage, wear, improper
looseness or end play; replace
if necessary. X X X X X X X X X
X
Inspect the brake linings. XXXXX X
Inspect and adjust parking
brake. X
XXXX X
Inspect drive belt; replace as
necessary. X
XXXX X
Inspect wheel bearings. XXXX X
Additional Maintenance
Replace the cabin air filter. XXXXX X
Mileage or time passed
(whichever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114
120

Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000

21_DPF_OM_EN_USC_t.book Page 360

SERVICING AND MAINTENANCE361
Replace the engine fuel filter. X X X X X X X X X X
Replace the chassis mounted
fuel filter. X X X X X X X X X
X
Inspect the front and rear axle
surfaces. If gear oil leakage is
suspected, check the fluid
level. If using your vehicle for
police, taxi, fleet, off-road or
frequent trailer towing change
the axle fluid.
3
Inspect the transfer case fluid
(4x4), change for any of the
following: police, taxi, fleet, or
frequent trailer towing. X
XXX X
Change the transfer case fluid
(4x4). X
X
Mileage or time passed
(whichever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114
120

Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
8

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362SERVICING AND MAINTENANCE
Change automatic
transmission fluid (AS69RC
transmission only). X
XXX X

Change the automatic
transmission fluid and sump filter
(AS69RC transmission only).
X
X
Change automatic
transmission fluid and filter(s)
(AS69RC transmission only). X
Replace Crankcase Ventilation
Filter (CCV). X
X
Flush and replace power
steering fluid. X
Mileage or time passed
(whichever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114
120

Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000

21_DPF_OM_EN_USC_t.book Page 362

SERVICING AND MAINTENANCE363
(Continued)

Inspection and service should also be performed
anytime a malfunction is observed or suspected.
Retain all receipts.
Flush and replace engine
coolant. ***

X
1. Under no circumstances should oil change intervals exceed 15,000 miles (24,000 km) or 12 months or 500 Hours, whichever comes first.
2. Under no circumstances should the engine air cleaner filter exceed 30,000 miles (48,000 km) or 24 months, whichever comes first.
3. Inspect the front and rear axle surfaces every 20,000 miles (32,000 km). If gear oil leakage is suspected, check the fluid level. If using your vehicle for police, taxi, fleet, off-road or
frequent trailer towing change the axle fluid every 20,000 miles (32,000 km).
Mileage or time passed
(whichever comes first):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114
120

Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
WARNING!
You can be badly injured working on or
around a motor vehicle. Do only service
work for which you have the knowledge and
the right equipment. If you have any doubt
about your ability to perform a service job,
take your vehicle to a competent mechanic.

Failure to properly inspect and maintain your
vehicle could result in a component malfunc -
tion and effect vehicle handling and perfor -
mance. This could cause an accident.

WARNING! (Continued)CAUTION!

***The manufacturer highly recommends that
all cooling system service, maintenance, and
repairs be performed by an authorized dealer.
8

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386SERVICING AND MAINTENANCE
Checking Coolant Level — 6.4L Engine
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.

Cooling System Notes
NOTE:
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 (antifreeze) 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.

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