Loose Fuel Filler Cap Message; Refueling The Vehicle - Diesel Engine; Diesel Exhaust Fluid - RAM Commercial CHASSIS CAB 3500 2021 Owner's Manual

196 STARTING AND OPERATING
L F F C M
OOSE UEL ILLER AP
If the vehicle diagnostic system
determines that the fuel filler cap
is loose, improperly installed, or
damaged, a loose gASCAP indicator
will display in the instrument cluster telltale
display area Ú page 90. Tighten the fuel filler
cap properly and push the RIGHT button to turn
off the message. If the problem continues, the
message will appear the next time the vehicle is
started.
REFUELING THE VEHICLE — DIESEL ENGINE
CAUTION!
To avoid fuel spillage and overfilling, do not
"top off" the fuel tank after filling.
NOTE:
When the fuel nozzle "clicks" or shuts off, the

fuel tank is full.
Tighten the fuel filler cap until you hear a

"clicking" sound. This is an indication that the
fuel filler cap is properly tightened.
Make sure that the fuel filler cap is tightened

each time the vehicle is refueled.
ESSAGE
A fire may result if gasoline is pumped into a
portable container that is inside of a vehicle.
You could be burned. Always place gas
containers on the ground while filling.
D E
IESEL XHAUST
Your vehicle is equipped with a Selective
Catalytic Reduction (SCR) system to meet the
very stringent diesel emissions standards
required by the Environmental Protection
Agency.
The purpose of the SCR system is to reduce levels
of NOx (oxides of nitrogen emitted from engines)
that are harmful to our health and the
environment to a near-zero level. A small quantity
of Diesel Exhaust Fluid (DEF) is injected into the
exhaust upstream of a catalyst where, when
vaporized, it converts smog-forming nitrogen
oxides (NOx) into harmless nitrogen (N2) and
water vapor (H2O), two natural components of
the air we breathe. You can operate with the
comfort that your vehicle is contributing to a
cleaner, healthier world environment for this and
generations to come.
WARNING!
F
LUID
System Overview
This vehicle is equipped with a Diesel Exhaust
Fluid (DEF) injection system and a Selective
Catalytic Reduction (SCR) catalyst to meet the
emission requirements.
The DEF injection system consists of the
following components:
DEF tank

DEF pump

DEF injector

Electronically-heated DEF lines

DEF control module

NOx sensors

Temperature sensors

SCR catalyst

UQS Sensor

For system messages and warnings Ú page 90.