Chevrolet 4500 HD 2023 Manual page 160

Warning
Do not warm up the DEF tank using a
burner, heater, etc. You and others could
be seriously injured.
DEF Storage
Seal the container and store it in an indoor
place with good ventilation avoiding direct
sunlight.
When storing DEF, the shelf life varies
depending on the room temperature of the
storage place. For details, please contact the
distributor of the DEF.
For storage of DEF, seal the container to
prevent the moisture from evaporating.
Even when DEF has been frozen, its quality
is maintained when it is thawed. It can be
used as it is.
To store or carry DEF, use the original
container in which the DEF was kept at the
time of purchase. Also, if other containers
are used, prepare a clean container for
exclusive use, which can be a polyethylene
resin tank (PE) or stainless steel container,
and do not introduce foreign matter such as
water or contamination.
DEF Disposal
Do not dispose of DEF and the empty
container into lakes, marine areas, rivers,
etc. DEF must be disposed of in a method
conforming to the regulatory requirements
in your state.
Selective Catalytic Reduction (SCR) System
The Selective Catalytic Reduction (SCR)
system reduces nitrogen oxide (NOx)
emissions emitted from a diesel engine. The
SCR system reduces NOx by adding
(injecting) Diesel Exhaust Fluid (DEF) into the
exhaust system and inducing a reaction
converting NOx into water vapor and
nitrogen.
The SCR system consists of the DEF tank,
DEF Control Unit, DEF Supply Pump and
Injector, and the SCR Catalyst. It is
important to keep a good supply of DEF in
the DEF tank at all times. Monitor the DEF
gauge to be sure the DEF tank level does
not become too low.
If the DEF level becomes too low or
incorrect fluid is added to the DEF tank, the
warning buzzer will sound, warning and
indicator lights will come on and engine
power will be reduced. If you see these
Driving and Operating
warning and indicator lights, add DEF as
soon as possible or have your vehicle
serviced as soon as possible.
Continuing to drive for too long after these
lights come on will result in additional
warnings, more engine power reduction and
will eventually result in a severe vehicle
speed limitation. See Diesel Exhaust
Fluid (DEF) Low Level Warning and
Incorrect Diesel Exhaust Fluid (DEF)/SCR
System Malfunction Warnings later in this
section.
Warning
Do not touch the water that comes out
from the muffler. The water is mildly
acidified due to the action of oxidation
catalyst inside the muffler. In the event
that the fluid does come into contact
with your skin, completely wash it off
with water. You and others could be
seriously injured.
Do not relocate or modify the exhaust pipe,
muffler, DPF, SCR, or DEF tank, which may
affect the exhaust gas cleaning performance.
If any relocation or modification is
necessary, consult your dealer.
159