2020 Ram 2500 check engine light

260STARTING AND OPERATING
Driving Through Water
Extreme care should be taken crossing any type
of water. Water crossings should be avoided if
possible and only be attempted when neces -
sary, in a safe responsible manner. You should
only drive through areas which are designated
and approved. You should tread lightly and
avoid damage to the environment. You should
know your vehicle's abilities and be able to
recover it if something goes wrong. You should
never stop or shut a vehicle off when crossing
deep water unless you ingested water into the
engine air intake. If the engine stalls do not
attempt to restart it. Determine if it has ingested
water first. The key to any crossing is low and
slow. You want to use FIRST gear in 4WD LOW
and proceed very slowly with a constant slow
speed (3-5 mph [5–8 km/h] maximum) and
light throttle. Keep the vehicle moving; do not
try to accelerate through the crossing. After
crossing any water higher than the bottom of
the axle differentials, you should inspect all of
the vehicle fluids for signs of water ingestion.
Before You Cross Any Type Of Water – As you
approach any type of water you need to
determine if you can cross it safely and
responsibly. If necessary, get out and walk
through the water or probe it with a stick. You
need to be sure of its depth, approach angle,
current and bottom condition. Be careful of
murky or muddy waters, check for hidden
obstacles. Make sure you will not be
intruding on any wildlife and you can recover
the vehicle if necessary. The key to a safe
crossing is the water depth, current and
bottom conditions. On soft bottoms the
vehicle will sink in, effectively increasing the
water level on the vehicle. Be sure to
consider this when determining the depth
and the ability to safely cross.
Crossing Puddles, Pools, Flooded Areas Or
Other Standing Water – Puddles, pools,
flooded or other standing water areas
normally contain murky or muddy waters.
These water types normally contain hidden
obstacles and make it difficult to determine
an accurate water depth, approach angle,
and bottom condition. Murky or muddy water
holes are where you want to hook up tow
straps prior to entering. This makes for a
faster, cleaner and easier vehicle recovery. If
you are able to determine you can safely
cross, than proceed using the low and slow
method.
Crossing Ditches, Streams, Shallow Rivers Or
Other Flowing Water – Flowing water can be
extremely dangerous. Never attempt to cross
a fast running stream or river even in shallow
water. Fast moving water can easily push
your vehicle downstream sweeping it out of
control. Even in very shallow water, a high
current can still wash the dirt out from
CAUTION!
Water ingestion into the axles, transmission,
transfer case, engine or vehicle interior can
occur if you drive too fast or through too deep
of water. Water can cause permanent
damage to engine, driveline or other vehicle
components and your brakes will be less
effective once wet and/or muddy.
CAUTION!
Muddy waters can reduce the cooling system
effectiveness by depositing debris onto the
radiator.

20_DJD2_OM_EN_USC_t.book Page 260

264STARTING AND OPERATING
Check threaded fasteners for looseness,
particularly on the chassis, drivetrain compo -
nents, steering, and suspension. Retighten
them, if required, and torque to the values
specified in the Service Manual.
Check for accumulations of plants or brush.
These things could be a fire hazard. They
might hide damage to fuel lines, brake hoses,
axle pinion seals, and propeller shafts.
After extended operation in mud, sand,
water, or similar dirty conditions, have the
radiator, fan, brake rotors, wheels, brake
linings, and axle yokes inspected and
cleaned as soon as possible.
If you experience unusual vibration after
driving in mud, slush or similar conditions,
check the wheels for impacted material.
Impacted material can cause a wheel imbal-
ance and freeing the wheels of it will correct
the situation.
LIMITED-SLIP DIFFERENTIAL
The limited-slip differential provides additional
traction on snow, ice, mud, sand and gravel,
particularly when there is a difference between
the traction characteristics of the surface under
the right and left rear wheels. During normal
driving and cornering, the limited-slip unit
performs similarly to a conventional differential.
On slippery surfaces, however, the differential
delivers more of the driving effort to the rear
wheel having the better traction.
The limited-slip differential is especially helpful
during slippery driving conditions. With both
rear wheels on a slippery surface, a slight appli -
cation of the accelerator will supply maximum
traction. When starting with only one rear wheel
on an excessively slippery surface, slight
momentary application of the parking brake
may be necessary to gain maximum traction. Care should be taken to avoid sudden accelera-
tions when both rear wheels are on a slippery
surface. This could cause both rear wheels to
spin, and allow the vehicle to slide sideways on
the crowned surface of a road or in a turn.
WINCH USAGE — POWER WAGON ONLY (IF
EQUIPPED)
Things To Know Before Using Your Winch
General Winch Information
Your vehicle is equipped with an electric vehicle
recovery winch. This winch uses the electrical
power from the vehicle charging system to
power a motor that winds the winch rope onto
the winch drum via planetary gear reduction. By
nature, a winch is capable of generating very
high forces and should be used with care. Do
WARNING!
Abrasive material in any part of the brakes
may cause excessive wear or unpredictable
braking. You might not have full braking
power when you need it to prevent a collision.
If you have been operating your vehicle in
dirty conditions, get your brakes checked and
cleaned as necessary.
WARNING!
On vehicles equipped with a limited-slip
differential never run the engine with one rear
wheel off the ground since the vehicle may
drive through the rear wheel remaining on the
ground. You could lose control of the vehicle.

20_DJD2_OM_EN_USC_t.book Page 264

STARTING AND OPERATING329
Speed Control — If Equipped
Do not use on hilly terrain or with heavy
loads.
When using the Speed Control, if you experi -
ence speed drops greater than 10 mph
(16 km/h), disengage until you can get back
to cruising speed.
Use Speed Control in flat terrain and with
light loads to maximize fuel efficiency.
Cooling System
To reduce potential for engine and transmission
overheating, take the following actions:
City Driving
In city traffic — while stopped, place the trans -
mission in NEUTRAL, but do not increase
engine idle speed.
Highway Driving
Reduce speed.
Temporarily turn off air conditioning.
Air Suspension System
To aid in attaching/detaching the trailer from
the vehicle, the air suspension system can be
used. Refer to “Air Suspension System” in “Starting And Operating” for further informa
-
tion.
NOTE:
The vehicle must remain in the engine running
position while attaching a trailer for proper
leveling of the air suspension system.
SNOWPLOW
Snowplow Prep Packages are available as a
factory installed option. These packages
include components necessary to equip your
vehicle with a snowplow.
NOTE:
Before installation of a snowplow it is highly
recommended that the owner/installer obtain
and follow the recommendations contained
within the current Body Builders Guide. See
your authorized dealer, installer or snowplow
manufacturer for this information. There are
unique electrical systems that must be
connected to properly ensure operator safety
and prevent overloading vehicle systems.
Before Plowing
Check the hydraulic system for leaks and
proper fluid level.
Check the mounting bolts and nuts for proper
tightness.
Check the runners and cutting edge for
excessive wear. The cutting edge should be
¼ to ½ inches (6 cm to 1.2 cm) above ground
in snow plowing position.
Check that snowplow lighting is connected
and functioning properly.
WARNING!
Attaching a snowplow to this vehicle could
adversely affect performance of the airbag
system in a collision. Do not expect that the
airbag will perform as described earlier in this
manual.
CAUTION!
The “Lamp Out” indicator could illuminate if
exterior lamps are not properly installed.
5

20_DJD2_OM_EN_USC_t.book Page 329

336STARTING AND OPERATING
(Continued)
Off-Road Driving Tips
Care should be taken when attempting to climb
steep hills or driving diagonally across a hill or
slope. If natural obstacles force you to travel
diagonally up or down a hill, choose a mild angle
and keep as little side tilt as possible. Keep the
vehicle moving and make turns slowly and
cautiously. If you must back down a hill, back straight down
using REVERSE gear. Never back down in
NEUTRAL or diagonally across the hill.
When driving over sand, mud, and other soft
terrain, shift to low gear and drive steadily.
Apply the accelerator slowly to avoid spinning
the wheels.
Do not reduce the tire pressures for this type of
driving.
After Driving Off-Road
Off-road operation puts more stress on your
vehicle than does most on-road driving. After
going off-road, it is always a good idea to check
for damage. That way you can get any problems
taken care of right away and have your vehicle
ready when you need it.
Completely inspect the underbody of your
vehicle. Check tires, body structure, steering,
suspension, and exhaust system for damage.
Inspect the radiator for mud and debris and
clean as required.
Driving through standing water limits your
vehicle’s braking capabilities, which
increases stopping distances. Therefore,
after driving through standing water, drive
slowly and lightly press on the brake pedal
several times to dry the brakes.
Failure to follow these warnings may result
in injuries that are serious or fatal to you,
your passengers, and others around you.
CAUTION!
Always check the depth of the standing
water before driving through it. Never drive
through standing water that is deeper than
the bottom of the tire rims mounted on the
vehicle.
Determine the condition of the road or the
path that is under water and if there are any
obstacles in the way before driving through
the standing water.
Do not exceed 5 mph (8 km/h) when
driving through standing water. This will
minimize wave effects.
WARNING!
(Continued)
Driving through standing water may cause
damage to your vehicle’s drivetrain compo -
nents. Always inspect your vehicle’s fluids
(i.e., engine oil, transmission, axle, etc.) for
signs of contamination (i.e., fluid that is
milky or foamy in appearance) after driving
through standing water. Do not continue to
operate the vehicle if any fluid appears
contaminated, as this may result in further
damage. Such damage is not covered by
the New Vehicle Limited Warranty.
Getting water inside your vehicle’s engine
can cause it to lock up and stall out, and
cause serious internal damage to the
engine. Such damage is not covered by the
New Vehicle Limited Warranty.
CAUTION! (Continued)

20_DJD2_OM_EN_USC_t.book Page 336

380
SERVICING AND MAINTENANCE
SCHEDULED SERVICING — GAS ENGINE
Your vehicle is equipped with an automatic oil
change indicator system. The oil change indi-
cator system will remind you that it is time to
take your vehicle in for scheduled maintenance.
Based on engine operation conditions, the oil
change indicator message will illuminate. This
means that service is required for your vehicle.
Operating conditions such as frequent
short-trips, trailer tow, extremely hot or cold
ambient temperatures, and E85 fuel usage will
influence when the “Oil Change Required”
message is displayed. Severe Operating Condi-
tions can cause the change oil message to illu -
minate as early as 3,500 miles (5,600 km)
since last reset. Have your vehicle serviced as
soon as possible, within the next 500 miles
(805 km).
Your authorized dealer will reset the oil change
indicator message after completing the sched -
uled oil change.
If a scheduled oil change is performed by
someone other than your authorized dealer, the
message can be reset by referring to the steps described under “Instrument Cluster Display” in
“Getting To Know Your Instrument Panel”.
NOTE:
Under no circumstances should oil change
intervals exceed 8,000 miles (13,000 km),
12 months or 350 hours of engine run time,
whichever comes first. The 350 hours of engine
run or idle time is generally only a concern for
fleet customers.
Severe Duty All Models
NOTE:
Change Engine Oil at 4,000 miles (6,500 km) or
350 hours of engine run time if the vehicle is
operated in a dusty and off road environment or
is operated predominantly at idle, or only very
low engine RPM. This type of vehicle use is
considered Severe Duty.
Once A Month Or Before A Long Trip:
Check engine oil level
Check windshield washer fluid level
Check tire pressure and look for unusual
wear or damage. Rotate tires at the first sign
of irregular wear, even if it occurs before the
oil indicator system turns on.
Check the fluid levels of the coolant reservoir,
brake master cylinder, power steering and
automatic transmission (six-speed only) and
fill as needed
Check function of all interior and exterior
lights
Maintenance Plan — Gasoline Engine
Required Maintenance
Refer to the Maintenance Plan on the following
pages for required maintenance. More frequent
maintenance may be needed in severe condi
-
tions, such as dusty areas and very short trip
driving. In some extreme conditions, additional
maintenance not specified in the maintenance
schedule may be required.

20_DJD2_OM_EN_USC_t.book Page 380

MULTIMEDIA459
NOTE:
FCA US LLC or your dealer may contact you
directly regarding software updates.
To help further improve vehicle security and
minimize the potential risk of a security
breach, vehicle owners should:
Routinely check www.driveuconnect.com
(US Residents) or www.driveuconnect.ca
(Canadian Residents) to learn about
available Uconnect software updates.
Only connect and use trusted media devices (e.g. personal mobile phones,
USBs, CDs).
Privacy of any wireless and wired communica -
tions cannot be assured. Third parties may
unlawfully intercept information and private
communications without your consent. For
further information, refer to “Data Collection &
Privacy” in your Uconnect Owner’s Manual
Supplement or “Onboard Diagnostic System
(OBD II) Cybersecurity” in “Getting To Know Your
Instrument Panel”.
UCONNECT SETTINGS
The Uconnect system uses a combination of
buttons on the touchscreen and buttons on the
faceplate located on the center of the instru -
ment panel. These buttons allow you to access
and change the customer programmable
features. Many features can vary by vehicle.
Buttons on the faceplate are located below
and/or beside the Uconnect system in the
center of the instrument panel. In addition,
there is a Scroll/Enter control knob located on
the right side. Turn the control knob to scroll
through menus and change settings. Push the
center of the control knob one or more times to
select or change a setting.
Your Uconnect system may also have Screen
Off and Mute buttons on the faceplate.
Push the Screen Off button on the faceplate to
turn off the Uconnect screen. Push the button
again or tap the screen to turn the screen on.
Push the Back Arrow button to exit out of a
Menu or certain option on the Uconnect system.
Uconnect 3 Settings

Uconnect 3 With 5-inch Display Buttons On The Touch -
screen And Buttons On The Faceplate

Push the SETTINGS button, then press the
Settings button on the touchscreen (if
equipped) to display the settings menu screen.
In this mode the Uconnect system allows you to
access programmable features that may be
equipped such as Display, Units, Voice, Clock,
Safety & Driving Assistance, Lights, Doors &
Locks, Power Side Steps, Auto-On Comfort (if
equipped), Engine Off Options, Suspension,
Trailer Brake, Audio, Phone/Bluetooth®, Siri -
usXM® Setup (if equipped), Restore Settings,
Clear Personal Data, and System Information.
1 — Uconnect Buttons On The Touchscreen
2 — Uconnect Buttons On The Faceplate
9

20_DJD2_OM_EN_USC_t.book Page 459

MULTIMEDIA473
Uconnect 4/4C/4C NAV Settings

Uconnect 4/4C/4C NAV With 8.4-inch Display Buttons
On The Touchscreen And Buttons On The Faceplate
Press the Apps button on the touchscreen then
press the Settings button on the touchscreen to
display the settings menu screen. In this mode
the Uconnect system allows you to access
programmable features that may be equipped
such as Language, Display, Units, Voice, Clock,
Safety & Driving Assistance, Mirrors & Wipers,
Lights, Doors & Locks, Power Side Steps (if
equipped), Auto-On Comfort (if equipped),
Engine Off Options, Suspension, Trailer, Audio,
Phone/Bluetooth®, SiriusXM® Setup (if
equipped), Restore Settings, and System Infor
-
mation.
When making a selection, press the button on
the touchscreen to enter the desired menu. Once in the desired menu, press and release
the preferred setting until a check-mark
appears next to the setting, showing that setting
has been selected. Once the setting is
complete, press the Back Arrow button on the
touchscreen to return to the previous menu or
press the X button on the touchscreen to close
out of the settings screen. Pressing the Up or
Down Arrow buttons on the touchscreen on the
right side of the screen will allow you to toggle
up or down through the list of available settings.
NOTE:
All settings should be changed with the ignition
in the ON/RUN position.
Language
After pressing the Set Language button on the touchscreen, the following settings will be available:
1 — Uconnect Buttons On The Touchscreen
2 — Uconnect Buttons On The Faceplate
Setting Name
Selectable Options
Set LanguageEnglishFrançais Español
NOTE:
When the “Set Language” feature is selected, you may select one of multiple languages (English / Français / Español) for all display nomenclature,
including the trip functions and the navigation system (if equipped). Press the Set Language button on the touchscreen, then press the desired
language button on the touchscreen until a check-mark appears next to the language, showing that setting has been selected.9

20_DJD2_OM_EN_USC_t.book Page 473

MULTIMEDIA493
Uconnect 4C NAV With 12-inch Display
Settings

Uconnect 4C NAV With 12-inch Display Buttons On The
Touchscreen And Buttons On The Faceplate
Press the Settings button on the touchscreen to
display the settings menu screen. In this mode,
the Uconnect system allows you to access
programmable features that may be equipped
such as Language, Display, Units, Voice
Settings, Clock & Date, Camera, Safety &
Driving Assistance, Mirrors and Wipers, Lights,
Doors & Locks, Auto-On Comfort & Remote Start
(if equipped), Engine Off Options, Suspension,
Trailer Brake, Audio Settings, Bluetooth®, Siri-
usXM® Setup (if equipped), and Reset.
When making a selection, press the button on
the touchscreen to enter the desired menu.
Once in the desired menu, press and release
the preferred setting until a check-mark
appears next to the setting, showing that setting
has been selected. Once the setting is
complete, press the Back Arrow button on the
touchscreen to return to the previous menu or
press the X button on the touchscreen to close
out of the settings screen. Pressing the Up or
Down Arrow buttons on the touchscreen on the
right side of the screen will allow you to toggle
up or down through the list of available settings.
NOTE:
All settings should be changed with the ignition
in the ON/RUN position.
1 — Uconnect Buttons On The Touchscreen
2 — Uconnect Buttons On The Faceplate
9

20_DJD2_OM_EN_USC_t.book Page 493