2021 RAM PROMASTER brake light

3
GETTING TO KNOW YOUR
INSTRUMENT PANEL
INSTRUMENT CLUSTER........................................42Instrument Cluster Descriptions ................. 43
INSTRUMENT CLUSTER DISPLAY .......................44
Location And Controls ................................. 44
Change Engine Oil — If Equipped................ 45
Display Setup Menu .................................... 46
Values Displayed ......................................... 46
Personal Settings
(Customer-Programmable Features) .......... 47
TRIP COMPUTER ...................................................47
Trip Button.................................................... 47
Trip Functions .............................................. 48
WARNING LIGHTS AND MESSAGES ..................48
Red Warning Lights...................................... 48
Yellow Warning Lights ................................. 50
Yellow Indicator Lights................................. 53
Green Indicator Lights ................................. 54
Blue Indicator Lights .................................... 54
ONBOARD DIAGNOSTIC SYSTEM — OBD II ......55
Onboard Diagnostic System (OBD II)
Cybersecurity................................................ 55
EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS ...........................................................56
STARTING AND OPERATING
STARTING THE ENGINE ...................................... 57
Automatic Transmission.............................. 57
Normal Starting............................................ 57
Cold Weather Operation
(Below –22°F Or −30°C) ........................... 57 If Engine Fails To Start ................................ 57
After Starting ................................................ 58
ENGINE BLOCK HEATER — IF EQUIPPED ......... 58
ENGINE BREAK-IN RECOMMENDATIONS ........ 58
PARKING BRAKE ................................................. 59
AUTOMATIC TRANSMISSION ............................. 60 Key Ignition Park Interlock .......................... 60
Brake/Transmission Shift Interlock
System ......................................................... 60 Six-Speed Automatic Transmission ............ 61
POWER STEERING .............................................. 66
Power Steering Fluid Check ....................... 67
CRUISE CONTROL — IF EQUIPPED .................... 67
To Activate.................................................... 68
To Set A Desired Speed............................... 68
To Vary The Speed Setting .......................... 68
To Accelerate For Passing ........................... 69
To Resume Speed ....................................... 69
To Deactivate ............................................... 69
PARKSENSE REAR PARK ASSIST —
IF EQUIPPED ......................................................... 69
ParkSense Rear Park Assist Sensors ......... 70
ParkSense Rear Park Assist Alerts ............. 70 ParkSense Rear Park Assist Failure
Indications.................................................... 72 Cleaning The ParkSense System................ 72
ParkSense Rear Park Assist System
Usage Precautions ...................................... 72
PARKVIEW REAR BACK UP CAMERA ...............73
REFUELING THE VEHICLE ....................................75
Loose Fuel Filler Cap Message................... 76
VEHICLE LOADING ................................................76
Vehicle Certification Label .......................... 76
Gross Vehicle Weight Rating (GVWR) ......... 76
Gross Axle Weight Rating (GAWR) ............. 76
Tire Size ........................................................ 77
Rim Size ....................................................... 77
Inflation Pressure ........................................ 77
Curb Weight ................................................. 77
Overloading .................................................. 77
Loading ........................................................ 77
TRAILER TOWING .................................................78
Common Towing Definitions ....................... 78
Trailer Hitch Classification .......................... 80
Trailer Towing Weights
(Maximum Trailer Weight Ratings) ............ 81 Trailer And Tongue Weight ......................... 81
Towing Requirements ................................ 81
Towing Tips ................................................. 84
RECREATIONAL TOWING
(BEHIND MOTORHOME) ......................................85
Towing This Vehicle Behind Another
Vehicle .......................................................... 85 Recreational Towing .................................... 85

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8
SYMBOL GLOSSARY
Some car components have colored labels with symbols indicating
precautions to be observed when using this component. It is important to
follow all warnings when operating your vehicle. See below for the
definition of each symbol Úpage 42.
Red Warning Lights
Seat Belt Reminder Warning Light
Úpage 48
Air Bag Warning Light Úpage 48
Battery Charge Warning Light Úpage 48
Door Open Warning Light Úpage 49
Electronic Throttle Control (ETC) Warning Light Úpage 49
Transmission Fault Warning Light Úpage 49
Engine Temperature Warning Light
Úpage 49
Brake Warning Light Úpage 49
Oil Pressure Warning Light Úpage 50
Vehicle Security Warning Light — If Equipped Úpage 50
Yellow Warning Lights
Immobilizer Fail / VPS Electrical Alarm
Indicator Light
Ú page 50
Tire Pressure Monitoring System (TPMS) Warning Light
Ú page 51
Electronic Stability Control (ESC) Warning Light Úpage 52
Red Warning Lights

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9
Electronic Stability Control (ESC) OFF Warning Light
Ú page 52
Engine Check/Malfunction Indicator Warning Light (MIL)
Úpage 52
Anti-Lock Brake System (ABS) Warning Light Úpage 53
Generic Warning Light Úpage 53
Yellow Indicator Lights
Forward Collision Warning (FCW) OFF Indicator
Light — If Equipped
Úpage 53
Service Forward Collision Warning (FCW) Light — If Equipped
Ú page 53

Yellow Warning Lights
TOW/HAUL Indicator Light Úpage 53
Green Indicator Lights
Turn Signal Indicator Lights
Úpage 54
Front Fog Indicator Light — If Equipped Úpage 54
Park/Headlight On Indicator Light Úpage 54
Cruise Control Indicator Light — If Equipped Úpage 54
Blue Indicator Lights
High Beam Indicator Light
Úpage 54
Yellow Indicator Lights
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12GETTING TO KNOW YOUR VEHICLE
(Continued)
SENTRY KEY
The Sentry Key Immobilizer System prevents
unauthorized vehicle operation by disabling the
engine. The system does not need to be armed
or activated. Operation is automatic, regardless
of whether the vehicle is locked or unlocked.
The system uses ignition keys which have an
embedded electronic chip (transponder) to
prevent unauthorized vehicle operation.
Therefore, only keys that are programmed to
the vehicle can be used to start and operate the
vehicle.
If the vehicle security light is on after the key is
turned to the MAR (ACC/ON/RUN) position, it
indicates that there is a problem with the
electronics.All of the keys provided with your new vehicle
have been programmed to the vehicle
electronics.
NOTE:
A key which has not been programmed is also
considered an invalid key, even if it is cut to fit
the ignition switch lock cylinder for that vehicle
Ú
page 274.
IGNITION SWITCH

1. Place the gear selector in PARK.

2. Rotate the key to the STOP (OFF/LOCK)
position.
3. Remove the key from the mechanical ignition switch.
Mechanical Ignition Switch Positions

CAUTION!
The Sentry Key Immobilizer system is not
compatible with some aftermarket remote
starting systems. Use of these systems may
result in vehicle starting problems and loss of
security protection.
1 — AVV (START)
2 — MAR (ACC/ON/RUN)
3 — STOP (OFF/LOCK)
WARNING!
Before exiting a vehicle, always shift the
automatic transmission into PARK, apply
the parking brake, turn the vehicle OFF,
remove the key fobs from vehicle, and lock
your vehicle.
Never leave children alone in a vehicle, or
with access to an unlocked vehicle.

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GETTING TO KNOW YOUR VEHICLE13
NOTE:
Opening the driver's door when the key is in the
ignition and the ignition switch position is STOP
(OFF/LOCK) sounds a signal to remove the key.
VEHICLE SECURITY SYSTEM — IF EQUIPPED
The Vehicle Security system monitors the
vehicle doors and ignition for unauthorized
operation. When the Vehicle Security system is
activated, interior switches for door locks are
disabled. The system provides both audible and
visible signals. For the first three minutes, the
horn will sound, and the turn signal lights will
flash. For an additional 15 minutes, only the
turn signal lights will flash.
TO ARM THE SYSTEM
To arm the system, the Vehicle Security system
will set when you use the key fob to lock the
doors. If a door or the hood is not properly shut,
the system will not be armed.
TO DISARM THE SYSTEM
Use the key fob to unlock the door and disarm
the system.
The Vehicle Security system will also disarm if a
programmed Sentry Key is inserted into the
ignition switch. To exit the alarming mode,
push the key fob unlock button, or insert a
programmed Sentry Key into the ignition switch. The Vehicle Security system is designed to
protect your vehicle. However, you can create
conditions where the system will give you a false
alarm. If one of the previously described arming
sequences has occurred, the Vehicle Security
system will arm regardless of whether you are in
the vehicle or not. If you remain in the vehicle
and open a door, the alarm will sound. If this
occurs, disarm the Vehicle Security system.
REARMING OF THE SYSTEM
If the system has not been disabled, the Vehicle
Security system will rearm itself after the 15
additional minutes of turn lamps flashing. If the
condition which initiated the alarm is still
present, the system will ignore that condition
and monitor the remaining doors and ignition.
SECURITY SYSTEM MANUAL OVERRIDE
The Vehicle Security system will not arm/disarm
if you lock/unlock the doors using the manual
door lock.
Allowing children to be in a vehicle unat
-
tended is dangerous for a number of
reasons. A child or others could be seriously
or fatally injured. Children should be
warned not to touch the parking brake,
brake pedal or the gear selector.
Do not leave the key fob in or near the
vehicle, or in a location accessible to chil-
dren. A child could operate power windows,
other controls, or move the vehicle.
Do not leave children or animals inside
parked vehicles in hot weather. Interior
heat build-up may cause serious injury or
death.
CAUTION!

An unlocked vehicle is an invitation. Always
remove the key from the ignition and lock all
the doors when leaving the vehicle unattended.

WARNING! (Continued)
2

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GETTING TO KNOW YOUR INSTRUMENT PANEL49
Door Open Warning Light
This indicator will illuminate when one
or more door(s) are not fully closed.
NOTE:
If the vehicle is moving and a door is opened,
there will also be a single chime.
Electronic Throttle Control Warning Light
This warning light will illuminate to
inform of a problem with the
Electronic Throttle Control (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 (P) 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.
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
MAR/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.
Transmission Fault Warning Light
This light will illuminate (together with
a message in the instrument cluster
display and a buzzer) to indicate a
transmission fault. Contact an
authorized dealer if the message remains after
restarting the engine.
Engine Temperature Warning Light
This 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 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 206.

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
3

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50GETTING TO KNOW YOUR INSTRUMENT PANEL
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.
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.
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.
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.
Vehicle Security Warning Light — If
Equipped
This light will flash at a fast rate for
approximately 15 seconds when the
vehicle security system is arming, and
then will flash slowly until the vehicle
is disarmed.
YELLOW WARNING LIGHTS
Immobilizer Fail / VPS Electrical Alarm
Indicator Light
This telltale will illuminate when the
vehicle security system system has
detected an attempt to break into the
vehicle.
NOTE:
After cycling the ignition to the ON/RUN posi -
tion, the Vehicle Security Warning Light could
illuminate if a problem with the system is
detected. This condition will result in the engine
being shut off after two seconds.
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 PANEL53
Anti-Lock Brake System (ABS) Warning
Light
This light monitors the ABS. The light
will turn on when the ignition is placed
in the ON/RUN or MAR/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. However, the conventional brake
system will continue to operate normally if the
brake warning light is not on.
If the ABS light is on, the brake system should
be serviced as soon as possible to restore the
benefits of Anti-Lock Brakes. If the ABS light
does not turn on when the ignition is placed in
the ON/RUN or MAR/ON/RUN position, have
the light inspected by an authorized dealer.
Generic Warning Light
The Generic Warning Light will
illuminate if any of the following
conditions occur: Engine Oil Pressure
Sensor Failure, External Light Failure,
Fuel Cut-Off intervention or fail, Parking Sensor
Failure, Dynamic Steering Torque System
Failure.
The telltale will remain on fixed in case of swivel
seat failure and on blinking in case of Air Bag
Warning Light Failure. Contact an authorized
dealer immediately for service.
YELLOW INDICATOR LIGHTS
Forward Collision Warning Off Indicator
Light — If Equipped
This indicator light illuminates to
indicate that Forward Collision
Warning is off.
Service Forward Collision Warning (FCW)
Light — If Equipped

This warning light will illuminate to
indicate a fault in the FCW System.
Contact an authorized dealer for service.

TOW/HAUL Indicator Light
This indicator light will illuminate
when TOW/HAUL mode is selected
Ú page 78.
WARNING!
A malfunctioning catalytic converter, as
referenced above, can reach higher
temperatures than in normal operating
conditions. This can cause a fire if you drive
slowly or park over flammable substances
such as dry plants, wood, cardboard, etc. This
could result in death or serious injury to the
driver, occupants or others.
CAUTION!
Prolonged driving with the Malfunction
Indicator Light (MIL) on could cause damage
to the vehicle control system. It also could
affect fuel economy and driveability. If the
MIL is flashing, severe catalytic converter
damage and power loss will soon occur.
Immediate service is required.
3

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