Chevrolet 4500HD Series 2019 Manual page 189

188 Driving and Operating
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 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