Chevrolet 4500 HD 2023 Manual page 156

3. Run the engine at idle. Be sure the
accelerator pedal is not pressed and the
PTO switch (if equipped) is OFF.
4. Press and hold the DPF switch until the
amber checking PM Level indicator light
appears on the DIC.
5. If Selectable regeneration is available,
the selectable (switch) regeneration
required warning light (amber) will
appear on the DIC. If this indicator light
does not appear on the DIC, the PM level
in the DPF filter is OK and DPF
regeneration is not needed at this time.
6. Press and release the DPF switch to
begin regeneration.
7. The selectable (switch) regeneration
required warning light (amber) will
change to regeneration in progress
indicator light.
8. Do not leave the vehicle during the
regeneration. Regeneration normally
completes in about 20 minutes, if the
engine is at operating temperature.
Regeneration may take longer if the
engine is cold.
9. When the regeneration in progress
indicator light goes out, the Selectable
regeneration is complete.
If the Selectable regeneration is interrupted,
a selectable (switch) regeneration required
warning light (amber) will appear on the
Driving and Operating
DIC. You must complete the DPF
regeneration by performing the Switch
regeneration as soon as possible when
Selectable regeneration is interrupted.
If you continue driving too long with the
selectable (switch) regeneration required
warning light (amber) displayed on the DIC,
the warning light will change to red. The
selectable (switch) regeneration required
warning light (red) 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
selectable (switch) regeneration required
warning light (red) is displayed on the DIC.
Continued driving without performing DPF
regeneration will cause the check engine
malfunction indicator light and reduced
engine power indicator light to come on, an
engine power reduction, and may cause
damage to the DPF filter. See Vehicle
Messages 0 67.
The time needed to complete regeneration
differs depending on the outside
temperature.
The exhaust brake is activated during DPF
regeneration. The exhaust brake starting to
operate or being disengaged will produce a
sound, but this does not indicate a failure.
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