Chevrolet Low Cab Forward 2023 Manual page 150

Automatic Regeneration of DPF
The DPF will regenerate itself as part of
normal operation.
The Engine Control Module (ECM) controls
this function based on several factors
including hours of operation and mileage.
When automatic regeneration starts, the
high exhaust system temperature indicator
light comes on.
During regeneration the engine idle speed
will increase and the exhaust brake may
activate when the vehicle is idling while
stopped or parked. Regeneration is normally
completed in about 20 minutes. See Driver
Information Center (DIC) 0 59.
Warning
Exhaust parts and gases become very
hot when the DPF is being
regenerated. In order to avoid being
burned, do not touch the exhaust
parts or DPF or get too close to the
exhaust gases.
Do not leave the vehicle during the
regeneration.
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 no flammable
material (for example, grass, waste
paper, oil or old tires) on or near the
DPF or exhaust system.
Driving and Operating
The DPF performs regeneration
automatically when a certain quantity of PM
accumulates in the filter.
Depending upon running conditions,
however, the regeneration may sometimes
not be completed. In this case, the diesel
particulate filter (DPF) warning light will
come on, so promptly activate DPF
regeneration by performing the "Switch
Regeneration Procedure".
This operation recovers the function of the
DPF. It does not mean that a breakdown has
occurred.
The engine speed may increase and the
exhaust brake may activate while the
vehicle is stopped with the engine idling.
When this occurs, the DPF is automatically
regenerated. This does not indicate a failure.
The system generates a sound during the
automatic regeneration and its cancellation.
This does not indicate a failure.
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