key RAM CHASSIS CAB 2021 Repair Manual

332SAFETY
(Continued)
PERIODIC SAFETY CHECKS YOU SHOULD
M
AKE OUTSIDE THE VEHICLE
Tires
Examine tires for excessive tread wear and
uneven wear patterns. Check for stones, nails,
glass, or other objects lodged in the tread or
sidewall. Inspect the tread for cuts and cracks.
Inspect sidewalls for cuts, cracks, and bulges.
Check the lug nuts/bolt torque for tightness.
Check the tires (including spare) for proper cold
inflation pressure.
Lights
Have someone observe the operation of brake
lights and exterior lights while you work the
controls. Check turn signal and high beam
indicator lights on the instrument panel.
Door Latches
Check for proper closing, latching, and locking.
Fluid Leaks
Check area under the vehicle after overnight
parking for fuel, coolant, oil, or other fluid leaks.
Also, if gasoline fumes are detected or if fuel or
brake fluid leaks are suspected, the cause
should be located and corrected immediately.
ONLY use the passenger’s side floor mat on
the passenger’s side floor area.

ALWAYS make sure objects cannot fall or
slide into the driver’s side floor area when the
vehicle is moving. Objects can become trapped
under accelerator, brake, or clutch pedals and
could cause a loss of vehicle control.

NEVER place any objects under the floor
mat (e.g., towels, keys, etc.). These objects
could change the position of the floor mat
and may cause interference with the accel -
erator, brake, or clutch pedals.

If the vehicle carpet has been removed and
re-installed, always properly attach carpet to
the floor and check the floor mat fasteners
are secure to the vehicle carpet. Fully
depress each pedal to check for interference
with the accelerator, brake, or clutch pedals
then re-install the floor mats.

WARNING! (Continued)
It is recommended to only use mild soap
and water to clean your floor mats. After
cleaning, always check your floor mat has
been properly installed and is secured to
your vehicle using the floor mat fasteners
by lightly pulling mat.
WARNING! (Continued)

21_DPF_OM_EN_USC_t.book Page 332

350IN CASE OF EMERGENCY
TOWING A DISABLED VEHICLE
This section describes procedures for towing a disabled vehicle using a commercial towing service. If the transmission and drivetrain are operable,
disabled vehicles may also be towed as described Ú page 215.
Proper towing or lifting equipment is required to
prevent damage to your vehicle. Use only tow
bars and other equipment designed for this
purpose, following equipment manufacturer’s
instructions. Use of safety chains is mandatory.
Attach a tow bar or other towing device to main
structural members of the vehicle, not to
fascia/bumpers or associated brackets. State
and local laws regarding vehicles under tow
must be observed. If you must use the accessories (wipers,
defrosters, etc.) while being towed, the ignition
must be in the ON/RUN mode, not the ACC
mode.
If the key fob is unavailable or the vehicle's
battery is discharged, Ú
page 348.
Towing Condition
Wheels OFF The
Ground 2WD Models
4WD Models
Flat Tow NONEIf transmission is operable:

• Transmission in NEUTRAL
• 30 mph (48 km/h) max speed
• 15 miles (24 km) max distance (6–speed transmission)
• 30 miles (48 km) max distance (8–speed transmission) Detailed instructions Ú
page 215
• Auto Transmission in PARK
• Transfer Case in NEUTRAL
• Tow in forward direction
Wheel Lift Or Dolly Tow Front
NOT ALLOWED
Rear OK NOT ALLOWED
Flatbed ALL BEST METHOD BEST METHOD
CAUTION!
Do not use sling type equipment when
towing. Vehicle damage may occur.
When securing the vehicle to a flat bed
truck, do not attach to front or rear suspen-
sion components. Damage to your vehicle
may result from improper towing.

21_DPF_OM_EN_USC_t.book Page 350

SERVICING AND MAINTENANCE379
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
S
TRATEGY — MESSAGE PROCESS FLOW
The Cummins diesel engine meets all
Environmental Protection Agency (EPA) Heavy
Duty Diesel Engine Emissions Standards,
resulting in one of the lowest emitting diesel
engines ever produced.

To achieve these emissions standards, your
vehicle is equipped with a state-of-the-art engine
and exhaust system. The engine and exhaust
after-treatment system work together to achieve
the EPA Heavy Duty Diesel Engine Emissions
Standards. These systems are seamlessly
integrated into your vehicle and managed by the Cummins Powertrain Control Module (PCM).
The PCM manages engine combustion to allow
the exhaust system’s catalyst to trap and burn
Particulate Matter (PM) pollutants, with no input
or interaction on your part.
If the engine is allowed to idle or the truck is
driven on low engine speed drive cycles for more
than two hours, the system will automatically
enter an emissions operating mode that will
increase the engine idle speed to 900 RPM
(1,050 RPM for Chassis Cab). While in this mode,
which is designed to help maintain the Diesel
Particulate Filter, the engine idle speed will return
to normal when the brake pedal is applied.
A small change in engine tone or a slight change
in engine performance while accelerating may
also be noticeable at speeds below 20 mph
(32 km/h). This operating mode may last for up
to an hour of idle time, or around 20 minutes of
driving time.

Additionally, your vehicle has the ability to alert
you to additional maintenance required on your
truck or engine Ú
page 90.
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
Úpage 440.
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)
WARNING!
A hot exhaust system can start a fire if you
park over materials that can burn. Such
materials might be grass or leaves coming
into contact with your exhaust system. Do not
park or operate your vehicle in areas where
your exhaust system can contact anything
that can burn.
8

21_DPF_OM_EN_USC_t.book Page 379

SERVICING AND MAINTENANCE397
F32– –Spare
F33 20 Amp Blue –Trans Control Module – If Equipped
F34 30 Amp Pink –Vehicle System Interface Module #2 – If Equipped
F35 30 Amp Pink –Sunroof – If Equipped
F36 30 Amp Pink –Electric Back Light – If Equipped
F37 30 Amp Pink –Diesel Frame / Fuel Heater #2– If Equipped
F38 30 Amp Pink –Integrated Trailer Brake Module – If Equipped
F39 – –Spare
F40 –10 Amp Red Ventilated Seats – If Equipped
F41 –10 Amp Red Active Grille Shutter / Active Air Dam – If Equipped
F42 –20 Amp Yellow Horn
F43 –15 Amp Blue Heated Steering Wheel – If Equipped
F44 –10 Amp Red Diagnostic Port
F46 –10 Amp Red Upfitters Relay Coil – If Equipped
F47 – –Spare
F48 – –Spare
F49 –10 Amp Red IP Cluster / CSG
F50 –20 Amp Yellow Air Suspension Control Module – If Equipped
F51 –10 Amp RedIgnition Node Module / Keyless Ignition Node Module, Radio Frequency
Hub Module / Electric Steering Column Lock - If Equipped
F52 –5 Amp Tan Battery Sensor
Cavity Cartridge Fuse Micro Fuse Description
8

21_DPF_OM_EN_USC_t.book Page 397

450
INDEX
 Pair (Link) Uconnect Phone To A Mobile
Phone............................................................ 260 WARRANTY INFORMATION...................... 447
A
Adaptive Cruise Control (ACC)
(Cruise Control)
.................................... 164, 166Adding Engine Coolant (Antifreeze)............... 384Adding Fuel.................................................... 196Additives, Fuel............................................... 434Adjust Down........................................................... 35Forward....................................................... 35Rearward..................................................... 35Up................................................................ 35Adjustable Pedals............................................ 40Advance Phone Connectivity......................... 266Air BagAir Bag Operation...................................... 305Air Bag Warning Light................................ 303Enhanced Accident Response......... 310, 352Event Data Recorder (EDR)....................... 352If Deployment Occurs................................ 309Knee Impact Bolsters................................ 305Maintaining Your Air Bag System.............. 311Maintenance............................................. 311
Redundant Air Bag Warning Light............. 303Transporting Pets..................................... 330Air Bag Light................................ 107, 303, 331Air Cleaner, Engine (Engine Air Cleaner
Filter)................................................... 369, 391Air Conditioner Maintenance........................ 371Air Conditioner Refrigerant.................. 371, 372Air Conditioner System................................. 371Air Conditioning................................................ 62Air Conditioning Filter....................................... 65Air Conditioning System................................... 64Air Conditioning, Operating Tips....................... 65Air Filter........................................................ 369Air PressureTires......................................................... 415AlarmSecurity Alarm....................................23, 108Alterations/ModificationsVehicle......................................................... 10Antifreeze (Engine Coolant).......................... 384Capacities................................................. 439Disposal................................................... 385Anti-Lock Brake System (ABS)...................... 273Anti-Lock Warning Light................................ 113Assist, Hill Start............................................. 280Audio Settings............................................... 253Audio Systems (Radio).................................. 220
Auto Down Power Windows..............................77Automatic Door Locks......................................28Automatic Headlights.......................................52Automatic Temperature Control (ATC)..............64Automatic Transmission....................... 141, 389Adding Fluid.............................................. 389Fluid And Filter Change............................. 389Fluid Change............................................. 389Fluid Level Check............................. 387, 388Fluid Type........................................ 390, 444Shifting..................................................... 146Special Additives...................................... 387Automatic Transmission Limp Home Mode... 145AutoPark....................................................... 120AUX Camera......................................... 188, 194Auxiliary Driving Systems.............................. 281Axle Fluid.....................................390, 391, 444Axle Lubrication................................... 390, 391
B
Back-Up......................................................... 186Back-Up Camera........................................... 186Battery................................................. 108, 366Blanket..................................................... 130Charging System Light.............................. 108Keyless Key Fob Replacement....................16Battery Saver Feature......................................54

21_DPF_OM_EN_USC_t.book Page 450

454 J
Jack Location
................................................. 339Jack Operation............................................... 339Jacking And Tire Changing............................. 339Jump Starting................................................ 344
K
Key Fob Programming Additional Key Fobs
.............. 17Key Fob Battery Service (Remote
Keyless Entry).................................................. 16Key Fob Programming (Remote
Keyless Entry).................................................. 17Keyless Enter-N-Go........................26, 118, 123Passive Entry............................................... 26Keys................................................................. 15
L
Lane Change And Turn Signals........................ 54Lane Change Assist......................................... 54LaneSense.................................................... 183Latches.......................................................... 332Hood........................................................... 79Lead Free Gasoline........................................ 433Leaks, Fluid................................................... 332Life Of Tires................................................... 417Light Bulbs........................................... 332, 401
Lights............................................................ 332Air Bag.................................... 107, 303, 331Automatic High Beam.................................. 52Brake Assist Warning............................... 277Brake Warning.......................................... 107Bulb Replacement.................................... 401Cab Top Clearance................................... 405Cargo........................................................... 54Center Mounted Stop............................... 405Courtesy/Reading....................................... 55Cruise....................................................... 115Daytime Running......................................... 51Electronic Stability Program(ESP) Indicator............................................... 108Exterior...............................................50, 332Fog........................................................... 404Four Wheel Drive Indicator....................... 162Hazard Warning Flasher........................... 334Headlights............................................ 50, 52High Beam................................................... 51Hill Descent Control Indicator................... 278Illuminated Entry......................................... 56Interior......................................................... 55Lights On Reminder..................................... 53Low Fuel................................................... 111Malfunction Indicator (Check Engine)....... 110Park.......................................................... 115Passing........................................................ 52
Seat Belt Reminder.................................. 107Security Alarm.......................................... 108Service...................................................... 401Traction Control........................................ 277Transfer Case........................................... 162Turn Signals..................... 54, 115, 332, 402Warning Instrument Cluster Descriptions................................ 108, 115Limited-Slip Differential....................... 162, 391Load Shed Battery Saver Mode..................... 105Load Shed Battery Saver On......................... 105Load Shed Electrical Load Reduction........... 105Load Shed Intelligent Battery Sensor............ 105Loading Vehicle............................................. 199Tires.......................................................... 411LocksAutomatic Door............................................28Child Protection...........................................28Power Door..................................................25Low Tire Pressure System............................. 284Lubrication, Body.......................................... 380Lug Nuts/Bolts..................................... 342, 432
M
Maintenance Free Battery............................ 366Maintenance Plan......................................... 359Maintenance Schedule............... 353, 357, 359Malfunction Indicator Light (Check Engine).. 110

21_DPF_OM_EN_USC_t.book Page 454

456 Power Steering Fluid
...................................... 444Pregnant Women And Seat Belts...................300Preparation For Jacking................................. 339Presets.......................................................... 253PTO (Power Take-Off)..................................... 163
R
Radial Ply Tires.............................................. 416Radiator Cap (Coolant Pressure Cap).. 384, 385Radio Presets...................................................... 253Radio Controls............................................... 247Radio Mode................................................... 247Radio Operation.................................. 247, 269Radio Remote Controls.................................. 247Rain Sensitive Wiper System........................... 58Rear Axle (Differential)......................... 390, 391Rear Camera................................................. 189Rear ParkSense System................................ 177Rear Window, Sliding....................................... 78Recreational Towing...................................... 214Shifting Into Transfer Case Neutral (N)..... 216Shifting Out Of Transfer Case Neutral (N).. 217Reformulated Gasoline.................................. 433Refrigerant.................................................... 372Release, Hood................................................. 79Reminder, Seat Belt...................................... 294Remote Keyless Entry...................................... 15Programming Additional Key Fobs.............. 17Remote Sound System (Radio) Control......... 247
Remote Start (Diesel)...................................... 22Remote Start (Gasoline).................................. 20Remote StartingExit Remote Start Mode.............................. 21Replacement Bulbs...................................... 401Replacement Tires........................................ 417Reporting Safety Defects.............................. 447Resetting Perform Service Indicator............. 358Restraints, Child........................................... 312Restraints, Head.............................................. 38Rotation, Tires.............................................. 424
S
Safety........................................................... 246Safety Checks Inside Vehicle........................ 330Safety Checks Outside Vehicle..................... 332Safety Defects, Reporting............................. 447Safety Features............................................. 246Safety Information, Tire................................ 406Safety Tips.................................................... 330Safety, Exhaust Gas...................................... 333Satellite Radio.............................................. 249Saved Radio Stations................................... 253Schedule, Maintenance................................ 353Seat BeltAutomatic Locking Retractor (ALR)........... 301Seat Belt Reminder....................................... 107Seat Belts............................................ 293, 330Adjustable Shoulder Belt.......................... 297
Adjustable Upper Shoulder Anchorage..... 297Adjustable Upper Shoulder Belt Anchorage............................................ 297Child Restraints........................................ 312Extender................................................... 299Front Seat........................................ 293, 296Inspection................................................. 330Lap/Shoulder Belt Operation.................... 296Lap/Shoulder Belt Untwisting................... 297Operating Instructions.............................. 296Pregnant Women...................................... 300Reminder.................................................. 294Seat Belt Extender.................................... 299Seat Belt Reminder.................................. 294Untwisting Procedure................................ 297Seat Belts Maintenance................................ 429Seats.................................................. 33, 34, 35Adjustment...........................................33, 35Easy Entry....................................................36Folding Floor................................................70Head Restraints...........................................38Memory.......................................................32Power...........................................................35Rear Folding................................................33Tilting...........................................................33Security Alarm........................................ 23, 108Selection Of Coolant (Antifreeze).................. 440Sentry Key (Immobilizer)..................................17Service Assistance........................................ 445Service Contract............................................ 446

21_DPF_OM_EN_USC_t.book Page 456

RAM CHASSIS CAB
2021 OWNER’S MANUAL
2021 RAM CHASSIS CAB
OWNERS.MOPAR.CACANADAMOPAR.COM/OM
U.S.
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