2021 RAM 1500 mileage

GETTING TO KNOW YOUR INSTRUMENT PANEL123
DISPLAYS
When the appropriate conditions exist, the
instrument cluster display displays the following
messages:
System Setup Unavailable – Vehicle Not in
Park
System Setup Unavailable – Vehicle in
Motion
Exhaust Filter Full Safely Drive at Highway
Speeds To Remedy
Exhaust Filter XX% Full – Power Reduced See
Dealer
Exhaust Service Required – See Dealer Now
Exhaust System – Filter XX% Full Service
Required See Dealer
Exhaust System – Regeneration In Process
Exhaust Filter XX% Full
Exhaust System – Regeneration Completed
Engine Will Not Restart in XXXX mi DEF Low
Refill Soon
Engine Will Not Restart in XXXX mi Refill DEF
Engine Will Not Restart Refill DEF
Service DEF System See Dealer
Incorrect DEF Detected See Dealer
Engine Will Not Restart in XXX mi Service DEF
See Dealer
Engine Will Not Restart Service DEF System
See Dealer
DIESEL EXHAUST FLUID (DEF)
W
ARNING MESSAGES
Your vehicle will begin displaying warning
messages when the DEF level reaches a driving
range of approximately 500 miles (800 km). If
the following warning message sequence is
ignored, your vehicle may not restart unless DEF
is added with in the displayed mileage shown in
the cluster message.
Engine Will Not Restart in XXXX mi DEF Low
Refill Soon — This message will display when
DEF driving range is less than 500 miles, DEF
fluid top off is required within the displayed
mileage. The message will be displayed in the
cluster during vehicle start up with the
current allowed mileage and accompanied by
a single chime. The remaining mileage can
be pulled up anytime in the “Messages” list
within the instrument cluster display.
Engine Will Not Restart in XXXX mi Refill DEF
— This message will display when DEF driving
range is less than 200 miles. It is also
displayed at 150 miles and 100 miles. DEF
fluid top off is required within the displayed
mileage. The message will be displayed in the
instrument cluster display during vehicle
start up with an updated distance mileage,
and it will be accompanied by a single chime.
Starting at 100 miles, remaining range will
be continuously displayed while operating
the vehicle. Chimes will also accompany the
75, 50 and 25 mile remaining distances. The
DEF Low telltale will be on continuously until
DEF fluid is topped off.
Engine Will Not Restart Refill DEF — This
message will display when the DEF driving
range is less than one mile, DEF fluid top off
is required or the engine will not restart. The
message will be displayed in the instrument
cluster display during vehicle start up, and it
will be accompanied by a single chime. The
DEF Low telltale will be illuminated continu -
ously until DEF fluid tank is filled with a
minimum of two gallons of DEF.
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124GETTING TO KNOW YOUR INSTRUMENT PANEL
DIESEL EXHAUST FLUID (DEF) FAULT
W
ARNING MESSAGES
There are 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.
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 and each time the vehicle is
started. The message will be accompanied by
a single chime and the Malfunction Indicator
Light. We recommend you drive to the
nearest authorized dealer and have your
vehicle serviced immediately. If not corrected
in 50 miles, vehicle will enter the “Engine Will
not restart in XXX mi Service DEF See dealer”
warning stage and message.
Incorrect DEF Detected See Dealer — This
message will display if the DEF system has
detected the incorrect fluid has been intro -
duced to the DEF tank. The message will be
accompanied by a single chime. We recom -
mend you drive to your nearest authorized dealer and have your vehicle serviced imme
-
diately. If not corrected in 30 miles, vehicle
will enter the “Engine Will not restart in XXX
mi Service DEF See dealer” warning stage
and message.
Engine Will Not Restart in XXX mi Service DEF
See Dealer — This message is first displayed
if the fault detected is not serviced after
50 miles of operation. It is also displayed at
150 miles, 125 miles and 100 miles. System
service is required within the displayed
mileage. The message will be displayed
during vehicle start up with an updated
distance mileage, and it will be accompanied
by a single chime. Starting at 100 miles,
remaining range will be continuously
displayed while operating the vehicle.
Chimes will also accompany the 75, 50 and
25 mile remaining distances. We recom -
mend you drive to the nearest authorized
dealer and have your vehicle serviced imme -
diately.
Engine Will Not Restart Service DEF System
See Dealer — This message will display if DEF
system issue detected is not serviced during
the allowed period. Your engine will not
restart unless your vehicle is serviced by an
authorized dealer. This message will be displayed when under 1 mile until engine will
not start and each time the vehicle is started,
and will be continuously displayed. The
message will be accompanied by a single
chime. Your Malfunction Indicator Light will
be continuously illumined. We highly recom-
mend you drive to the nearest authorized
dealer if the message appears while engine
is running.
Engine Will Not Start Service DEF System See
Dealer — This message will display when the
fault detected is not serviced after the Engine
will not restart Service DEF System See
Dealer message is displayed on the next
subsequent restart. Your engine will not start
unless your vehicle is serviced by an autho-
rized dealer. The message will be accompa
-
nied by a single chime. Your Malfunction
Indicator Light will be continuously illumi -
nated. If the message appears and you can
not start the engine, we recommend having
your vehicle towed to the nearest authorized
dealer immediately.

21_DT_OM_EN_USC_t.book Page 124

SERVICING AND MAINTENANCE397
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 XX XX
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 XXX
Inspect the brake linings, replace as
necessary. X
X X XX XX
Inspect transfer case fluid. X
Additional Maintenance
Replace cabin air filter. XX X XX XX
Replace engine air cleaner. XX XXX
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398SERVICING AND MAINTENANCE
If equipped with Stop/Start, replace
accessory drive belt with OEM grade
Mopar belt. X
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
Inspect the transfer case fluid, change
for any of the following: police, taxi,
fleet, or frequent trailer towing. X
X
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

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SERVICING AND MAINTENANCE401
Mileage or time passed (whichever comes first)
10,000
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: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
16,000
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
Completely fill the Diesel Exhaust Fluid tank. 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
Inspect front suspension, tie rod ends, and replace if
necessary. X X X X X X X
Inspect the front and rear axle fluid. 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. X
XXXX
Inspect the brake linings, parking brake function. X X X X X X X
Additional Maintenance
Replace cabin air filter X X X X X X X
Drain water from fuel filter assembly. X X X X X X X X X X X X X X X
Replace fuel filter and drain water from the fuel filter
assembly.
1Fuel filter replacement intervals should be every second oil change and must not exceed 20,000 miles (32,000 km) if using diesel fuel up to B5.
8

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402SERVICING AND MAINTENANCE
Replace engine air cleaner. XXXXX
Flush and replace the engine coolant at 10 years or
150,000 miles (240,000 km) whichever comes first. X
X
Replace accessory drive belt(s). X
Inspect the transfer case fluid, change for any of the
following: police, taxi, fleet, or frequent trailer towing. X
X
Change transfer case fluid. X
1. Under normal conditions the diesel fuel filter should be replaced every 20,000 miles (32,000 km) (every other oil change). If the vehicle is being used in severe operating conditions,
or In certain geographical areas of the country (Pennsylvania, New York, Ohio, Maryland, West Virginia, Arkansas, Oklahoma, Kansas, Iowa, Missouri and Nebraska) due to fuel
cleanliness issues, it’s recommended to replace the fuel filter every 10,000 miles (16,000 km).
Mileage or time passed (whichever comes first)
10,000
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: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
16,000
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

21_DT_OM_EN_USC_t.book Page 402

SERVICING AND MAINTENANCE403
ADDITIONAL MAINTENANCE — B6 TO
B20 B
IODIESEL
NOTE:
Under no circumstances should oil change
intervals exceed 8,000 miles (12,875 km) or
six months, whichever comes first when
using biodiesel blends greater than 5% (B5).
The owner is required to monitor mileage for
B6-B20 biodiesel, the automatic oil change
indicator system does not reflect the use of
biofuels.
Fuel filter change interval is maintained at
every second oil change. This is especially
important with biodiesel usage.
For more information on using biodiesel
Ú page 472.
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
malfunction and effect vehicle handling
and performance. This could cause an acci -
dent.
8

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424SERVICING AND MAINTENANCE

Coolant Reservoir Dipstick

3. Check the coolant level on the dipstick.
The radiator normally remains completely full,
so there is no need to remove the radiator cap
unless checking for engine coolant (antifreeze)
freeze point or replacing engine coolant. 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 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
(D
IESEL ENGINE)
The charge air cooler is positioned in front of 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

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