Chevrolet Kodiak 2008 Owner's Manual page 115

4. Fully set the parking brake.
5. Shift the transmission to PARK (P) or
NEUTRAL (N).
6. Idle the engine. If you used the idling control knob
to increase the engine speed, restore it all the way
to the left to reduce the engine speed.
7. If the vehicle has Power Take Off (PTO), turn the
PTO off. See Power Take-Off (PTO) on page 2-32.
8. Press the DPF switch in the instrument panel
switchbank. See Instrument Panel Switchbank
on page 3-18. The green DPF indicator light comes
on, the exhaust gas control valve operates,
engine idle speed automatically increases, and DPF
regeneration begins. Do not leave the vehicle
unattended during manual regeneration.
9. When both the green and the yellow or red DPF
indicator lights go off, regeneration is completed.
Regeneration is normally completed in about
30 minutes.
Under certain operating conditions, manual regeneration
might not be able to be performed, even if the soot
level in the DPF requires regeneration. This can occur
because of low coolant temperature, low battery voltage,
or high exhaust temperature or immediately after
starting the vehicle. When manual regeneration is
requested, by pressing the DPF switch, when coolant
temperature is low, engine warm-up is started, the green
indicator light will come on, the exhaust gas control
valve operates, and engine rpm increases to help raise
engine coolant temperature. When operating conditions
allow, regeneration will start.
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