2021 RAM CHASSIS CAB brake light

92GETTING TO KNOW YOUR INSTRUMENT PANEL
4. Push and hold the right arrow button to
select “Reset”.
5. Push and release the down arrow button
to select “Yes,” then push and release the
right arrow button to reset the Oil Life to
100%.
6. Push and release the up arrow button to
exit the instrument cluster display screen.
Secondary Method Of Resetting Engine Oil Life

1. Without pressing the brake pedal, push the ENGINE START/STOP button and place the
ignition to the ON/RUN position (do not
start the engine).

2. Fully press the accelerator pedal, slowly, three times within ten seconds.
3. Without pushing the brake pedal, push the ENGINE START/STOP button once to return
the ignition to the OFF/LOCK position.
NOTE:
If the indicator message illuminates when
you start the vehicle, the oil change indicator
system did not reset. If necessary, repeat this
procedure.DISPLAY MENU ITEMS
Push and release the up or down arrow
button until the desired selectable menu icon is
highlighted in the instrument cluster display.
Speedometer
Push and release the up or down arrow
button until the speedometer menu item is
highlighted in the instrument cluster display.
Push and release the right arrow button to
cycle the display between mph and km/h.
Vehicle Info
Push and release the up or down arrow
button until the Vehicle Info menu item is
highlighted in the instrument cluster display.
Push and release the right arrow button to
enter the submenus items of Vehicle Info.
Follow the directional prompts to access or
reset any of the following Vehicle Info submenu
items:
Tire Pressure
Coolant Temperature
Transmission Temperature — If Equipped
Oil Temperature
Oil Pressure
Exhaust Brake — If Equipped
Boost Pressure — If Equipped
Diesel Particulate Filter (DPF) — If Equipped
Oil Life
Fuel Filter Life — If Equipped
Battery Voltage
Gauge Summary
Engine Hours
Off-Road
Push and release the up or down arrow
button until the Off-Road menu icon is displayed
in the instrument cluster display. Push and
release the left or right arrow button to
scroll through the information submenus.
Drivetrain
Front Wheel Angle: displays the graphical
and numerical value of calculated
average front wheel angle from the
steering wheel orientation.

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94GETTING TO KNOW YOUR INSTRUMENT PANEL
Fuel Economy
Push and release the up or down arrow
button until the Fuel Economy menu item is
highlighted in the instrument cluster display.
Push and Hold the right arrow button to reset
Average Fuel Economy.
Current Fuel Economy Gauge
Average Fuel Economy Value
Range To Empty
Fuel Tank Levels — If Equipped
Trip A/Trip B
Push and release the up or down arrow
button until the Trip menu item is highlighted
in the instrument cluster display. Push and
release the right arrow button to enter the
submenus of Trip A and Trip B. The Trip A or Trip
B information will display the following:
Distance
Average Fuel Economy
Elapsed Time
Push and hold right arrow button to reset all
information.
Trailer Tow
Push and release the up or down arrow
button until the Trailer Tow menu item is
highlighted in the instrument cluster display.
Push and release the right or left arrow
button to cycle through the following trailer tow
information:
Trip (trailer specific) Distance: Push and hold
the OK button to reset the distance.
Integrated Trailer Brake Module (ITBM):
Braking Output
Trailer Type
ITBM Gain
Trailer Light Check: Push and hold the
OK button to begin the Trailer Light Test
sequence Ú page 209.
Trailer Tire Pressure Monitoring: The Instru-
ment Cluster Display will display the Trailer
Tire Pressure for a connected trailer with
sensors that match the active trailer profile.
When a low tire is present, the low tire value
will be displayed in red, and the affected low tire will have a red glow. “Trailer Tire Low“ will
be displayed on the center bottom of the
Instrument Cluster Display screen.
Audio
Push and release the
up or down arrow
button until the Audio Menu icon/title is
highlighted in the instrument cluster display.
This menu will display the audio source
information, including the Song name, Artist
name, and audio source with an accompanying
graphic.
Phone Call Status
When a call is incoming, a Phone Call Status
pop-up will display on the screen. The pop-up
will remain until the phone is answered or
ignored.
NOTE:
The call status will temporarily replace the
previous media source information displayed
on the screen. When the pop-up is no longer
displayed, the display will return to the last used
screen.

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GETTING TO KNOW YOUR INSTRUMENT PANEL95
Stored Messages
Push and release the up or down arrow
button until the Messages Menu item is
highlighted. This feature shows the number of
stored warning messages. Push and release the
right or left arrow button to cycle through
stored messages.
Screen Setup Menu Item
Push and release the up or down arrow
button until the Screen Setup menu item is
highlighted in the instrument cluster display.
Push and release the right arrow button to
enter the Screen Setup submenu. The Screen
Setup feature allows you to change what
information is displayed in the instrument
cluster as well as the location that information
is displayed.
Current Gear — If Equipped
Off
On
Odometer
Unit Without Decimal
Unit With Decimal Favorite Menu
Speedometer
Vehicle Info
Driver Assist (Show/Hide) — If Equipped
Fuel Economy (Show/Hide)
Trip Info (Show/Hide)
Trailer Tow (Show/Hide)
Audio (Show/Hide)
Messages
Screen Setup
Vehicle Settings — If Equipped
Commercial Settings — If Equipped
NOTE:
Menus with (Show/Hide) can push the right
arrow button to choose whether to show or hide
this menu in the instrument cluster display. Upper Left — If Equipped
None
Compass — If Equipped
Outside Temp — If Equipped
Time
Range To Empty
Average Econ
Current Econ
Trip A Distance
Trip B Distance
Trailer Trip — If Equipped
Trailer Brake — If Equipped
Oil Pressure — If Equipped
Coolant Temperature — If Equipped
Oil Temperature — If Equipped
Battery Voltage — If Equipped
Transmission Temperature — If Equipped
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100GETTING TO KNOW YOUR INSTRUMENT PANEL
Brake TypeBrake Type Light Electric; Heavy Electric; Light EOH; Heavy EOH
Trailer Name Trailer Name
Trailer # (# is equal to slot position)
Boat
Car
Cargo
Dump
Equipment
Flatbed
Gooseneck
Horse
Livestock
Motorcycle
Snowmobile
Travel
Utility
5th Wheel
Compass Variance Compass Var 1-15 increments of 1
Setting NamesSetting Names Abbreviated
(Left Submenu Layer) Submenus (Right Submenu Layer)

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GETTING TO KNOW YOUR INSTRUMENT PANEL107
WARNING LIGHTS AND MESSAGES

The warning/indicator lights will illuminate in the
instrument panel together with a dedicated
message and/or acoustic signal when
applicable. These indications are indicative
and precautionary and as such must not be
considered as exhaustive. Always refer to the
information in this chapter in the event of a
failure indication. All active telltales will display
first if applicable. The system check menu may
appear different based upon equipment options
and current vehicle status. Some telltales are
optional and may not appear.

RED WARNING LIGHTS
Seat Belt Reminder Warning Light

This warning light indicates when
the driver or passenger seat belt is
unbuckled. When the ignition is first
placed in the ON/RUN or ACC/ON/RUN
position and if the driver’s seat belt is unbuckled,
a chime will sound and the light will turn on.
When driving, if the driver or front passenger seat
belt remains unbuckled, the Seat Belt Reminder
Light will flash or remain on continuously and a
chime will sound
Ú
page 292.

Air Bag Warning Light
This warning light will illuminate to
indicate a fault with the air bag, and
will turn on for four to eight seconds
as a bulb check when the ignition
is placed in the ON/RUN or ACC/ON/RUN
position. This light will illuminate with a single
chime when a fault with the air bag has been
detected, it will stay on until the fault is cleared.
If the light is not on during startup, stays on,
or turns on while driving, have the system
inspected at an authorized dealer as soon as
possible.
Brake Warning Light
This warning light monitors various
brake functions, including brake fluid
level and parking brake application.
If the brake light turns on it may
indicate that the parking brake is applied, that
the brake fluid level is low, or that there is a
problem with the Anti-Lock Brake System
reservoir.
If the light remains on when the parking brake
has been disengaged, and the fluid level is at
the full mark on the master cylinder reservoir,
it indicates a possible brake hydraulic system
malfunction or that a problem with the Brake Booster has been detected by the Anti-Lock
Brake System (ABS) / Electronic Stability
Control (ESC) system. In this case, the light
will remain on until the condition has been
corrected. If the problem is related to the brake
booster, the ABS pump will run when applying
the brake, and a brake pedal pulsation may be
felt during each stop.
The dual brake system provides a reserve
braking capacity in the event of a failure to a
portion of the hydraulic system. A leak in either
half of the dual brake system is indicated by the
Brake Warning Light, which will turn on when
the brake fluid level in the master cylinder has
dropped below a specified level.
The light will remain on until the cause is
corrected.
NOTE:
The light may flash momentarily during sharp
cornering maneuvers, which change fluid level
conditions. The vehicle should have service
performed, and the brake fluid level checked.
If brake failure is indicated, immediate repair is
necessary.
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108GETTING TO KNOW YOUR INSTRUMENT PANEL
Vehicles equipped with the Anti-Lock Brake
System (ABS) are also equipped with Electronic
Brake Force Distribution (EBD). In the event of
an EBD failure, the Brake Warning Light will turn
on along with the ABS Light. Immediate repair to
the ABS system is required.

Operation of the Brake Warning Light can be
checked by turning the ignition switch from the
OFF position to the ON/RUN position. The light
should illuminate for approximately two seconds.
The light should then turn off unless the parking
brake is applied or a brake fault is detected. If the
light does not illuminate, have the light inspected
by an authorized dealer.

The light also will turn on when the parking
brake is applied with the ignition switch in the
ON/RUN position. NOTE:
This light shows only that the parking brake is
applied. It does not show the degree of brake
application.
Hood Open Warning Light
This warning light will illuminate when
the hood is ajar/open and not fully
closed.
NOTE:
If the vehicle is moving, there will also be a
single chime.
Vehicle Security Warning Light — If
Equipped
This light will flash at a fast rate for
approximately 15 seconds when the
vehicle security alarm is arming, and
then will flash slowly until the vehicle
is disarmed.
Engine Coolant Temperature Warning
Light
This warning light warns of an
overheated engine condition. If the
engine coolant temperature is too
high, this indicator will illuminate and
a single chime will sound. If the temperature reaches the upper limit, a continuous chime will
sound for four minutes or until the engine is
able to cool, whichever comes first.
If the light turns on while driving, safely pull over
and stop the vehicle. If the Air Conditioning
(A/C) system is on, turn it off. Also, shift the
transmission into NEUTRAL and idle the vehicle.
If the temperature reading does not return to
normal, turn the engine off immediately and call
for service Ú
page 346.
Battery Charge Warning Light
This warning light will illuminate when
the battery is not charging properly.
If it stays on while the engine is
running, there may be a malfunction
with the charging system. Contact an
authorized dealer as soon as possible.
This indicates a possible problem with the
electrical system or a related component.
Oil Pressure Warning Light
This warning light will illuminate to
indicate low engine oil pressure. If the
light turns on while driving, stop the
vehicle, shut off the engine as soon as
possible, and contact an authorized dealer.
A chime will sound when this light turns on.
WARNING!
Driving a vehicle with the red brake light on is
dangerous. Part of the brake system may
have failed. It will take longer to stop the
vehicle. You could have a collision. Have the
vehicle checked immediately.

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GETTING TO KNOW YOUR INSTRUMENT PANEL109
Do not operate the vehicle until the cause is
corrected. This light does not indicate how
much oil is in the engine. The engine oil level
must be checked under the hood.
Oil Temperature Warning Light
This warning light will illuminate to
indicate the engine oil temperature is
high. If the light turns on while driving,
stop the vehicle and shut off the
engine as soon as possible. Wait for oil
temperature to return to normal levels.
Electronic Throttle Control (ETC) Warning
Light
This warning light will illuminate to
indicate a problem with the ETC
system. If a problem is detected while
the vehicle is running, the light will
either stay on or flash depending on the nature
of the problem. Cycle the ignition when the
vehicle is safely and completely stopped and
the transmission is placed in the PARK position.
The light should turn off. If the light remains
on with the vehicle running, your vehicle will
usually be drivable; however, see an authorized
dealer for service as soon as possible. NOTE:
This light may turn on if the accelerator and
brake pedals are pressed at the same time.
If the light continues to flash when the vehicle is
running, immediate service is required and you
may experience reduced performance, an
elevated/rough idle, or engine stall and your
vehicle may require towing. The light will come
on when the ignition is placed in the ON/RUN or
ACC/ON/RUN position and remain on briefly as
a bulb check. If the light does not come on
during starting, have the system checked by an
authorized dealer.Electric Power Steering (EPS) Fault
Warning Light
This warning light will turn on when
there's a fault with the EPS system
Ú
page 163.
Trailer Brake Disconnected Warning Light
This warning light will illuminate when
the Trailer Brake has been
disconnected Ú page 200.
Transmission Temperature Warning
Light — If Equipped
This warning light will illuminate to
warn of a high transmission fluid
temperature. This may occur with
strenuous usage such as trailer
towing. If this light turns on, stop the vehicle and
run the engine at idle or slightly faster, with the
transmission in PARK or NEUTRAL, until the
light turns off. Once the light turns off, you may
continue to drive normally.
WARNING!
Continued operation with reduced assist
could pose a safety risk to yourself and
others. Service should be obtained as soon
as possible.
WARNING!
If you continue operating the vehicle when
the Transmission Temperature Warning Light
is illuminated you could cause the fluid to boil
over, come in contact with hot engine or
exhaust components and cause a fire.
3

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GETTING TO KNOW YOUR INSTRUMENT PANEL113
Anti-Lock Brake System (ABS) Warning
Light

This warning light monitors the ABS.
The light will turn on when the ignition is
placed in the ON/RUN or ACC/ON/RUN
position and may stay on for as long as
four seconds.

If the ABS light remains on or turns on while
driving, then the Anti-Lock portion of the brake
system is not functioning and service is required
as soon as possible. However, the conventional
brake system will continue to operate normally,
assuming the Brake Warning Light is not also on.

If the ABS light does not turn on when the ignition is
placed in the ON/RUN or ACC/ON/RUN position,
have the brake system inspected by an authorized
dealer.

Service Forward Collision Warning (FCW)
Light — If Equipped

This warning light will illuminate to
indicate a fault in the Forward Collision
Warning System. Contact an authorized
dealer for service
Ú
page 281.

Service 4WD Warning Light — If Equipped
This warning light will illuminate to
signal a fault with the 4WD system.
If the light stays on or comes on
during driving, it means that the 4WD
system is not functioning properly and that
service is required. We recommend you drive to
the nearest service center and have the vehicle
serviced immediately.
Cruise Control Fault Warning Light

This warning light will illuminate to
indicate the Cruise Control System is
not functioning properly and service is
required. Contact an authorized dealer.

YELLOW INDICATOR LIGHTS
Forward Collision Warning (FCW) Off
Indicator Light — If Equipped
This indicator light illuminates to
indicate that Forward Collision
Warning is off Ú page 281.
TOW/HAUL Indicator Light
This indicator light will illuminate
when TOW/HAUL mode is selected.
Trailer Merge Assist Indicator Light — If
Equipped
This indicator light will illuminate to
indicate when Trailer Merge Assist
has been activated.
Cargo Light — If Equipped
This indicator light will illuminate
when the cargo light is activated by
pushing the cargo light button on the
headlight switch.
Snowplow Mode Indicator Light — If
Equipped
This indicator light will illuminate
when Snowplow Mode has been
activated Úpage 212.
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