tires RAM 1500 2021 Service Manual

SERVICING AND MAINTENANCE455
SPARE TIRES — IF EQUIPPED
NOTE:
For vehicles equipped with Tire Service Kit
instead of a spare tire, please refer to “Tire
Service Kit” in “In Case Of Emergency” for
further information.
For restrictions when towing with a spare tire
designated for temporary emergency use
Úpage 222.
Spare Tire Matching Original Equipped Tire
And Wheel — If Equipped
Your vehicle may be equipped with a spare tire
and wheel equivalent in look and function to the
original equipment tire and wheel found on the
front or rear axle of your vehicle. This spare tire
may be used in the tire rotation for your vehicle.
If your vehicle has this option, refer to an
authorized tire dealer for the recommended tire
rotation pattern.
Compact Spare Tire — If Equipped
The compact spare is for temporary emergency
use only. You can identify if your vehicle is
equipped with a compact spare by looking at
the spare tire description on the Tire and
Loading Information Placard located on the
driver’s side door opening or on the sidewall of
the tire. Compact spare tire descriptions begin
with the letter “T” or “S” preceding the size
designation. Example: T145/80D18 103M.
T, S = Temporary Spare Tire
Since this tire has limited tread life, the original
equipment tire should be repaired (or replaced)
and reinstalled on your vehicle at the first
opportunity.
Do not install a wheel cover or attempt to mount
a conventional tire on the compact spare wheel,
since the wheel is designed specifically for the
compact spare tire. Do not install more than
one compact spare tire and wheel on the
vehicle at any given time.
Collapsible Spare Tire — If Equipped
The collapsible spare is for temporary
emergency use only. You can identify if your
vehicle is equipped with a collapsible spare by
looking at the spare tire description on the Tire
and Loading Information Placard located on the
driver’s side door opening or on the sidewall of
the tire.
Collapsible spare tire description example:
165/80-17 101P.
Since this tire has limited tread life, the original
equipment tire should be repaired (or replaced)
and reinstalled on your vehicle at the first
opportunity.
CAUTION!
Because of the reduced ground clearance, do
not take your vehicle through an automatic car
wash with a compact or limited use temporary
spare installed. Damage to the vehicle may
result.
WARNING!
Compact and collapsible spares are for
temporary emergency use only. With these
spares, do not drive more than 50 mph
(80 km/h). Temporary use spares have
limited tread life. When the tread is worn to
the tread wear indicators, the temporary use
spare tire needs to be replaced. Be sure to
follow the warnings, which apply to your
spare. Failure to do so could result in spare
tire failure and loss of vehicle control.
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SERVICING AND MAINTENANCE459
(Continued)
(Continued)
4x4 (4WD)
Trim Level Axle
Tire/Wheel Size Snow Traction Device
(maximum projection beyond tire profile or equivalent)
Tradesman
Bighorn Lonestar Laramie Rear
275/65R18
275/55/R20 S Class
Longhorn Sport
Limited Rear
275/55R20 S Class
REBEL Not Chainable
WARNING!
Using tires of different size and type (M+S,
Snow) between front and rear axles can
cause unpredictable handling. You could lose
control and have a collision.
CAUTION!
To avoid damage to your vehicle or tires,
observe the following precautions:
Because of restricted traction device clear-
ance between tires and other suspension
components, it is important that only trac-
tion devices in good condition are used.
Broken devices can cause serious damage.
Stop the vehicle immediately if noise
occurs that could indicate device breakage.
Remove the damaged parts of the device
before further use.
Install device as tightly as possible and
then retighten after driving about ½ mile
(0.8 km). Autosock traction devices do not
require retightening.
Do not exceed 30 mph (48 km/h).
Drive cautiously and avoid severe turns and
large bumps, especially with a loaded
vehicle.
Do not drive for a prolonged period on dry
pavement.
CAUTION! (Continued)
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460SERVICING AND MAINTENANCE
TIRE ROTATION RECOMMENDATIONS
Tires on the front and rear axles of vehicles
operate at different loads and perform different
steering, driving, and braking functions. For
these reasons, they wear at unequal rates.
These effects can be reduced by timely rotation
of tires. The benefits of rotation are especially
worthwhile with aggressive tread designs such
as those on all season type tires. Rotation will
increase tread life, help to maintain mud, snow
and wet traction levels and contribute to a
smooth, quiet ride.
For the proper maintenance intervals
Úpage 395. More frequent rotation is
permissible if desired. The reasons for any rapid or unusual wear should be corrected prior to
rotation being performed.
The suggested rotation method is the “rearward
cross” shown in the following diagram. This
rotation pattern does not apply to some
directional tires that must not be reversed.

Tire Rotation (Rearward Cross)

DEPARTMENT OF TRANSPORTATION
UNIFORM TIRE QUALITY GRADES
The following tire grading categories
were established by the National
Highway Traffic Safety Administration.
The specific grade rating assigned by the
tire's manufacturer in each category is shown on the sidewall of the tires on
your vehicle.
All passenger vehicle tires must conform
to Federal safety requirements in
addition to these grades.
TREADWEAR
The Treadwear grade is a comparative
rating, based on the wear rate of the tire
when tested under controlled conditions
on a specified government test course.
For example, a tire graded 150 would
wear one and one-half times as well on
the government course as a tire graded
100. The relative performance of tires
depends upon the actual conditions of
their use, however, and may depart
significantly from the norm due to
variations in driving habits, service
practices, and differences in road
characteristics and climate.
Observe the traction device manufacturer’s
instructions on the method of installation,
operating speed, and conditions for use.
Always use the suggested operating speed
of the device manufacturer’s if it is less
than 30 mph (48 km/h).
Do not use traction devices on a compact
spare tire.
CAUTION!
(Continued)

21_DT_OM_EN_USC_t.book Page 460

SERVICING AND MAINTENANCE461
TRACTION GRADES
The Traction grades, from highest to
lowest, are AA, A, B, and C. These grades
represent the tire's ability to stop on wet
pavement, as measured under
controlled conditions on specified
government test surfaces of asphalt and
concrete. A tire marked C may have poor
traction performance.
TEMPERATURE GRADES
The Temperature grades are A (the
highest), B, and C, representing the tire's
resistance to the generation of heat and
its ability to dissipate heat, when tested
under controlled conditions on a
specified indoor laboratory test wheel. Sustained high temperature can cause
the material of the tire to degenerate
and reduce tire life, and excessive
temperature can lead to sudden tire
failure. The grade C corresponds to a
level of performance, which all
passenger vehicle tires must meet
under the Federal Motor Vehicle Safety
Standard No. 109. Grades B and A
represent higher levels of performance
on the laboratory test wheel, than the
minimum required by law.
STORING THE VEHICLE
If you are storing your vehicle for more than
three weeks, we recommend that you take the
following steps to minimize the drain on your
vehicle's battery:
Disconnect the negative cable from battery.
Any time you store your vehicle or keep it out
of service (i.e., vacation) for two weeks or
more, run the air conditioning system at idle
for about five minutes in the fresh air and
high blower setting. This will ensure
adequate system lubrication to minimize the
possibility of compressor damage when the
system is started again.
BODYWORK
PROTECTION FROM ATMOSPHERIC
A
GENTS
Vehicle body care requirements vary according
to geographic locations and usage. Chemicals
that make roads passable in snow and ice and
those that are sprayed on trees and road
surfaces during other seasons are highly
corrosive to the metal in your vehicle. Outside
parking, which exposes your vehicle to airborne
WARNING!
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration, cor -
nering, hydroplaning, or peak traction charac -
teristics.
WARNING!
The temperature grade for this tire is
established for a tire that is properly inflated
and not overloaded. Excessive speed,
underinflation, or excessive loading, either
separately or in combination, can cause heat
buildup and possible tire failure.
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483
INDEX
A
Adaptive Cruise Control (ACC) (Cruise
Control)
................................................ 177, 179Adding Engine Coolant (Antifreeze)............... 422Adding Fuel.......................................... 208, 210Additives, Fuel............................................... 469AdjustDown........................................................... 36Forward....................................................... 36Rearward..................................................... 36Up................................................................ 36Adjustable Pedals............................................ 43Advance Phone Connectivity......................... 279Air BagAir Bag Operation...................................... 344Air Bag Warning Light...................... 342, 345Enhanced Accident Response......... 353, 394Event Data Recorder (EDR)....................... 394Front Air Bag............................................. 345If Deployment Occurs................................ 352Knee Impact Bolsters................................ 349Maintaining Your Air Bag System.............. 354Maintenance............................................. 354Redundant Air Bag Warning Light.............343Transporting Pets...................................... 369Air Bag Light............................... 126, 342, 369
Air Cleaner, Engine (Engine Air Cleaner
Filter)............................................................ 411Air Conditioner Maintenance........................ 415Air Conditioner Refrigerant........................... 415Air Conditioner System................................. 415Air Conditioning................................................ 63Air Conditioning Filter..............................67, 415Air Conditioning System................................... 65Air Conditioning, Operating Tips....................... 66Air Filter........................................................ 411Air PressureTires......................................................... 450Air Suspension..................................... 165, 169AlarmSecurity Alarm....................................26, 127Alterations/ModificationsVehicle......................................................... 11Antifreeze (Engine Coolant)................. 422, 474Disposal................................................... 423Anti-Lock Brake System (ABS)...................... 310Anti-Lock Warning Light................................ 132Assist, Hill Start............................................. 317Audio Settings............................................... 266Audio Systems (Radio).................................. 236Auto Down Power Windows............................. 78Automatic Door Locks...................................... 30
Automatic Headlights.......................................54Automatic High Beams.....................................53Automatic Tailgate Release.............................85Automatic Temperature Control (ATC)..............65Automatic Transmission....................... 156, 426Adding Fluid.............................................. 426Fluid And Filter Change............................. 426Fluid Change............................................. 426Fluid Level Check...................................... 426Fluid Type........................................ 426, 478Special Additives...................................... 426Automatic Transmission Limp Home Mode... 159AutoPark....................................................... 141AUX Camera......................................... 204, 208Auxiliary Driving Systems.............................. 318Axle Fluid.............................................. 426, 478Axle Lubrication............................................ 426
B
Back-Up......................................................... 202Back-Up Camera........................................... 202Battery................................................. 128, 409Charging System Light.............................. 128Keyless Key Fob Replacement....................18Battery Saver Feature......................................57Belts, Seat.................................................... 369
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487
J
Jack Location
................................................. 377Jump Starting................................................ 386
K
Key Fob Programming Additional Key Fobs
.............. 20Key Fob Battery Service (Remote Keyless
Entry)............................................................... 18Key Fob Programming (Remote Keyless
Entry)............................................................... 20Keyless Enter-N-Go................................. 28, 143Passive Entry............................................... 28Keys................................................................. 17
L
Lane Change And Turn Signals........................ 55Lane Change Assist......................................... 55LaneSense.................................................... 199Lap/Shoulder Belts....................................... 336Latches.......................................................... 371Hood........................................................... 84Lead Free Gasoline........................................ 468Leaks, Fluid................................................... 371Life Of Tires................................................... 452Light Bulbs........................................... 371, 437
Lights............................................................ 371Air Bag.................................... 126, 342, 369Brake Assist Warning............................... 314Brake Warning.......................................... 126Bulb Replacement.................................... 437Cargo........................................................... 56Center Mounted Stop............................... 442Courtesy/Reading....................................... 57Cruise....................................................... 136Daytime Running......................................... 53Electronic Stability Program (ESP)Indicator............................................... 128Exterior...............................................52, 371Fog........................................................... 441Hazard Warning Flasher........................... 373Headlights............................................ 52, 54High Beam................................................... 53High Beam/Low Beam Select...................... 53Hill Descent Control Indicator................... 315Illuminated Entry......................................... 58Interior......................................................... 57Lights On Reminder..................................... 55Low Fuel................................................... 131Malfunction Indicator (Check Engine)....... 130Park.......................................................... 135Passing........................................................ 54
Seat Belt Reminder.................................. 126Security Alarm.......................................... 127Service...................................................... 437Traction Control........................................ 314Turn Signals............55, 136, 371, 439, 441Warning Instrument ClusterDescriptions................................ 128, 136Limited-Slip Differential....................... 174, 427Load Shed Battery Saver Mode..................... 125Load Shed Battery Saver On......................... 125Load Shed Electrical Load Reduction........... 125Load Shed Intelligent Battery Sensor............ 125Loading Vehicle............................................. 213Tires.......................................................... 447LocksAutomatic Door............................................30Child Protection...........................................31Power Door..................................................28Low Tire Pressure System............................. 327Lubrication, Body.......................................... 418Lug Nuts........................................................ 467Lug Nuts/Bolts.............................................. 467
M
Maintenance.............................................81, 84Maintenance Free Battery............................ 409Maintenance Schedule............... 395, 399, 40011

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489
R
Radial Ply Tires
.............................................. 451Radiator Cap (Coolant Pressure Cap).. 421, 423Radio Presets...................................................... 265Radio Controls............................................... 259Radio Mode................................................... 259Radio Operation.................................. 259, 309Radio Remote Controls.................................. 259Rain Sensitive Wiper System........................... 59Rear Axle (Differential)................................... 426Rear Camera................................................. 204Rear Cargo Area Utility Rails............................ 91Rear Cross Path............................................. 321Rear ParkSense System................................ 189Rear Window, Sliding....................................... 79Reclining Rear Seats....................................... 36Recreational Towing...................................... 230Shifting Into Transfer Case Neutral (N)..... 232Shifting Out Of Transfer Case Neutral (N).. 233Reformulated Gasoline.................................. 469Refrigerant.................................................... 415Registering SiriusXM Guardian...................... 283Release, Hood................................................. 84Release, Tailgate............................................. 85Reminder, Seat Belt...................................... 335Remote Features, Door Lock/Unlock.. 290, 302Remote Features, Horn And Lights................291Remote Features, Starting.................. 291, 303
Remote Keyless EntryProgramming Additional Key Fobs............... 20Remote Sound System (Radio) Control......... 259Remote Start (Diesel)...................................... 25Remote Start (Gasoline).................................. 22Remote StartingExit Remote Start Mode.............................. 23Remote Starting System........................... 22, 25Remove, Tailgate............................................. 86Replacement Bulbs...................................... 437Replacement Tires........................................ 453Reporting Safety Defects.............................. 481Restraints, Child........................................... 355Restraints, Head.............................................. 40Roadside Assistance............................ 292, 302Rotation, Tires.............................................. 460
S
Safety........................................................... 258Safety Checks Inside Vehicle........................ 369Safety Checks Outside Vehicle..................... 371Safety Defects, Reporting............................. 481Safety Features............................................. 258Safety Information, Tire................................ 443Safety Tips.................................................... 369Safety, Exhaust Gas...................................... 371Satellite Radio.............................................. 261Saved Radio Stations................................... 265
Schedule, Maintenance..............395, 399, 400Seat Belt Reminder....................................... 126Seat Belts............................................ 335, 369Adjustable Shoulder Belt.......................... 339Adjustable Upper Shoulder Anchorage..... 339Adjustable Upper Shoulder Belt Anchorage............................................ 339Automatic Locking Retractor (ALR)........... 341Child Restraints........................................ 355Energy Management Feature................... 340Extender................................................... 340Front Seat............................... 335, 336, 338Inspection................................................. 369Lap/Shoulder Belt Operation.................... 338Lap/Shoulder Belt Untwisting................... 339Lap/Shoulder Belts................................... 336Operating Instructions.............................. 338Pregnant Women...................................... 340Pretensioners........................................... 340Rear Seat.................................................. 336Reminder.................................................. 335Seat Belt Extender.................................... 340Seat Belt Pretensioner.............................. 340Seat Belt Reminder.................................. 335Untwisting Procedure................................ 339Seat Belts Maintenance................................ 465
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490
Seats
................................................. 34, 35, 36Adjustment........................................... 34, 36Easy Entry................................................... 37Head Restraints.......................................... 40Memory....................................................... 32Power.......................................................... 36Rear Folding................................................ 34Reclining Rear............................................. 36Tilting.......................................................... 34Security System...................................... 26, 127Selection Of Coolant (Antifreeze)...................475Send & Go........................................... 293, 302Sentry Key (Immobilizer).................................. 20Service Assistance......................................... 479Service Contract............................................ 480Service Manuals............................................ 482Settings, Audio.............................................. 266Shifting.......................................................... 154Automatic Transmission............................ 156Transfer Case, Shifting Into Transfer Case Neutral (N)................................... 232Transfer Case, Shifting Out Of TransferCase Neutral (N)................................... 233Shoulder Belts............................................... 336Side Steps, Power............................................ 28Signals, Turn..................................55, 136, 371Sirius Satellite Radio..................................... 261Favorites................................................... 264Replay....................................................... 262
SiriusXM Satellite RadioBrowse in SXM......................................... 264Favorites................................................... 264Replay...................................................... 262Sliding Rear Window, Power............................ 79Smart Watch................................................. 300Snow Chains (Tire Chains)............................ 458Snow Plow.................................................... 227Snow Tires.................................................... 454SOS Call............................................... 286, 301Spare Tires.......................................... 455, 456Spark Plugs................................................... 475Speed Control (Cruise Control)..................... 179Starting....................................... 140, 143, 144Automatic Transmission........................... 141Button......................................................... 21Cold Weather............................................ 146Engine Fails To Start................................. 144Starting And Operating......................... 143, 144Starting Procedures............................. 143, 144Starting Procedures (Gas Engines)............... 140SteeringPower....................................................... 174Tilt Column.................................................. 31Wheel, Heated...................................... 31, 32Wheel, Tilt.................................................... 31Steering Wheel Audio Controls..................... 259Steering Wheel Mounted Sound System...... 259
Steps, Power Side............................................28Stolen Vehicle Assistance.................... 297, 303Storage............................................................68Storage Compartment, Center Seat.................68Storage, Vehicle..................................... 66, 461Store Radio Presets...................................... 265Storing Your Vehicle...................................... 461Sun Roof..................................... 80, 81, 82, 84Sunglasses Storage.........................................70Sunshade Operation........................................81SuspensionAir.................................................... 165, 169Sway Control, Trailer..................................... 318Synthetic Engine Oil...................................... 410
T
Tailgate Removal.............................................86Tailgate, Electronic Lowering...........................85Telescoping Steering Column...........................31Temperature Control, Automatic (ATC).............65TiltDown...........................................................37Up................................................................37Tilt Steering Column.........................................31Tip Start........................................................ 143Tire And Loading Information Placard........... 447Tire Markings................................................ 443Tire Safety Information.................................. 443

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491
Tires
................................... 371, 449, 455, 460Aging (Life Of Tires)................................... 452Air Pressure............................................... 449Chains....................................................... 458Compact Spare......................................... 455Dual........................................................... 467General Information........................ 449, 455High Speed................................................ 451Inflation Pressure...................................... 450Life Of Tires............................................... 452Load Capacity............................................ 447Pressure Monitoring System (TPMS)........................................ 131, 327Quality Grading.......................................... 460Radial........................................................ 451Replacement............................................. 453Rotation.................................................... 460Safety.............................................. 443, 449Sizes.......................................................... 444Snow Tires................................................. 454Spare Tires...................................... 455, 456Spinning.................................................... 452Trailer Towing............................................ 222Tread Wear Indicators............................... 452Wheel Nut Torque..................................... 467To Open Hood.................................................. 84Tongue Weight/Trailer Weight....................... 219Tonneau Cover....................................... 97, 462Tonneau Cover Cleaning................................ 462
Towing................................................. 214, 392Disabled Vehicle....................................... 392Guide........................................................ 218Recreational............................................. 230Weight...................................................... 218Towing Behind A Motorhome........................ 230Traction......................................................... 234Traction Control............................................ 318Trailer Reverse Steering Control................... 219Trailer Sway Control (TSC)............................. 318Trailer Towing............................................... 214Hitches..................................................... 218Minimum Requirements........................... 221Mirrors......................................................... 48Tips........................................................... 227Trailer And Tongue Weight........................ 219Wiring....................................................... 225Trailer Towing Guide..................................... 218Trailer Weight................................................ 218Transfer Case............................................... 427Electronically Shifted....................... 161, 163Fluid......................................................... 478Transmission................................................ 156Automatic........................................ 156, 426Fluid......................................................... 478Maintenance............................................ 426Shifting..................................................... 154Transporting Pets.......................................... 369Tread Wear Indicators.................................. 452Turn Signals......................... 55, 136, 439, 441
U
UconnectPhone Call Features
................................. 276Things You Should Know About Your Uconnect Phone................................... 279Uconnect App................................................ 284Uconnect Phone................................... 272, 273Answer Or Ignore An Incoming Call — Call Currently In Progress..................... 278Answer Or Ignore An Incoming Call — No Call Currently In Progress................ 277Bluetooth Communication Link................ 281Call Continuation...................................... 279Call Controls............................................. 277Call Termination....................................... 279Cancel Command..................................... 273Connecting To A Particular Mobile Phone Or Audio Device After Pairing................ 275Help Command......................................... 273Join Calls.................................................. 279Making A Phone Or Audio Device AFavorite................................................ 275Making A Second Call While Current Call Is In Progress........................................ 278Managing Your Favorites.......................... 276Natural Speech......................................... 272Operation.................................................. 272Overview................................................... 27111

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