Chevrolet 4500 HD 2023 Manual page 152

The system generates a sound during the
automatic regeneration and its cancellation.
This does not indicate a failure.
DPF Switch
The DPF switch is used to burn PM
(regenerate the filter). You can initiate
regeneration when the regeneration
required warning light or selectable (switch)
regeneration required warning light turns on
with short repeated beeps.
Continuing driving without performing the
regeneration will cause the check engine
malfunction indicator light and reduced
engine power indicator light to come on.
The DPF then must be repaired at the
nearest dealer.
Emergency Regeneration Procedure
If the regeneration required warning light
(amber) or selectable (switch) regeneration
required warning light (amber) turns on the
DIC, the DPF could not satisfactorily
complete automatic regeneration and driver
action is required. If the regeneration
required warning light (Not selectable
(switch) regeneration warning light) is
Driving and Operating
turned on, you can choose from Running
regeneration or Switch regeneration in order
to complete the DPF regeneration.
If the selectable (switch) regeneration
required warning light turns on, you have to
perform Switch regeneration in order to
complete the DPF regeneration. If you
continue driving too long with the
regeneration required warning light (amber)
or selectable (switch) regeneration required
warning light (amber) displayed on the DIC
without performing one of the possible
regenerations, the message will change to
red Regeneration Required warning light or
selectable (switch) regeneration required
warning light.
The red regeneration required warning light
or selectable (switch) regeneration required
warning light indicates the DPF filter is
nearly full of PM, a condition which may be
damaging to the filter.
DPF regeneration should be completed
immediately if the red regeneration required
warning light or selectable (switch)
regeneration required warning light is
displayed on the DIC.
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