Chevrolet 4500 HD 2023 Manual page 151

150 Driving and Operating
As PM accumulation increases inside the
DPF, the DIC will display additional bars
increasing from L to H to show the
approximate level of PM accumulation. See
Driver Information Center (DIC) 0 64.
DPF Regeneration Status
This amber display indicates the DPF is
regenerating. During DPF regeneration, the
DIC can display the status of PM reduction
in amber. The highest accumulation level bar
will be flashing as indication of the
regeneration process.
As PM levels decrease in the DPF during the
regeneration process, the DIC will decrease
the number of bars from H to L. See Driver
Information Center (DIC) 0 64.
Automatic Regeneration of DPF
The DPF will regenerate itself as part of
normal operation. If this light comes on
while driving, there is no fault. Continue
normal driving.
The engine control module (ECM) controls
this function based on several factors
including hours of operation and mileage.
When automatic regeneration starts, the
regeneration in progress indicator light
(amber) is displayed on the DIC.
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 64.
Warning
To prevent fire, ensure that there is no
combustible material near the muffler,
the DPF or the exhaust pipe. Also, be
careful not to burn yourself on the hot
exhaust gas. You and others could be
seriously injured.
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
regeneration required warning light (amber)
will come on, so promptly operate the
emergency regeneration according to the
Emergency 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.