Diesel Particulate Filter - Chevrolet 4500 HD 2023 Manual

148 Driving and Operating

Diesel Particulate Filter

Diesel Particulate Filter (DPF)
The DPF purifies diesel exhaust gases of
particulate matter (PM). PM is filtered from
the exhaust gas and collected in the DPF.
When PM is collected to the predetermined
level by the engine control module, the DPF
automatically burns the PM in a process
called regeneration.
Regeneration may not be completed under
certain driving conditions. If this occurs, the
Driver Information Center (DIC) will provide
prompts to properly complete DPF
regeneration.
The following sections will provide details on
DPF regeneration. Follow the steps carefully
to keep the DPF in good working order. See
Driver Information Center (DIC) 0 64,
Recommended Fluids and Lubricants 0 330,
and Engine Oil 0 242.
Warning
Exhaust parts and gases become very hot
when the DPF is being regenerated.
Parking over flammable items could allow
them to touch hot exhaust parts under
your vehicle and cause them to ignite. Do
not park over papers, leaves, grass or
other things that can burn. Make sure
there is not flammable material (for
example, grass, waste paper, oil or old
tires) on or near the DPF or exhaust
system. You and others could be
seriously injured.
This content is to restore the function of the
DPF and it is not a malfunction. However,
the check engine malfunction indicator light
and reduced engine power indicator light
may come on and the power output may be
limited if driving or power take-off (PTO)
operation is continued for a long time with
the regeneration required warning light or
selectable (switch) regeneration required
warning light (amber/red) on.
This is to prevent the DPF from being
damaged. When operating PTO during
parking, check to ensure that the
regeneration required warning light or
selectable (switch) regeneration required
warning light (amber/red) on the DIC is
not on.
Engine oil that supports DPF (low ash oil) is
recommended. Use of low ash oil extends
the maintenance interval of the DPF filter.
Do not modify the DPF or exhaust pipe.
Changing the alignment, length or diameter
of the exhaust pipe would adversely affect
the exhaust system's exhaust emission
reduction function. If any modification is
necessary to install a component to the rear
of the vehicle, consult your dealer.
Although the DPF filter automatically
undergoes regeneration (burning of the
accumulated PM) when a certain amount of
PM has accumulated, driving conditions can
prevent completion of regeneration.
The selectable (switch) regeneration required
warning light (amber) will turn on when
regeneration cannot be completed
automatically. Perform Running or Switch
regeneration in accordance with the proper
procedure. This is to restore DPF function
and is normal.