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Exhaust Treatment DGC-2020ES
DPF Status and Pre-Alarms
The DGC-2020ES receives DPF status information which is broadcast from the engine ECU in various
Parameter Group Numbers (PGN) and Suspect Parameter Numbers (SPN). The DGC-2020ES displays
this information on the front panel, and in BESTCOMSPlus, via DPF related pre-alarms. The J1939
parameters and the resulting DGC-2020ES pre-alarms are summarized in the following paragraphs.
• PGN 64892 (0xFD7C) Diesel Particulate Filter Control 1
o SPN 3697, Diesel Particulate Filter Lamp Command
DPF REGEN REQUIRED Pre-Alarm: When SPN 3697 has a
value of 1 or 4 indicating the DPF lamp is on, the DGC-2020ES
will annunciate a pre-alarm with text of DPF REGEN REQUIRED.
The DPF symbol, shown to the right, will accompany the text
when the pre-alarm appears on the DGC-2020ES front panel.
o SPN 3698, Exhaust System High Temperature Lamp Command
HIGH EXHAUST TEMP Pre-Alarm: When SPN 3698 has a value
of 1 indicating the high exhaust temperature lamp is on, the DGC-
2020ES will annunciate a pre-alarm with text of HIGH EXHAUST
TEMP. The high exhaust temperature symbol, shown to the right,
will accompany the text when the pre-alarm appears on the DGC-
2020ES front panel.
o SPN 3701 Diesel Particulate Filter Status
SPN 3701 indicates that regeneration is required at the lowest level, moderate level, or most
severe level. The DGC-2020ES uses this parameter for DPF Soot Level Pre-alarms which
are described in the following paragraphs.
o SPN 3703 Diesel Particulate Filter Active Regeneration Inhibited Due to Inhibit Switch
DPF REGEN INHIBITED Pre-Alarm: When SPN 3703 has a value
of 1 indicating the DPF Regeneration is inhibited due to the inhibit
switch being set, the DGC-2020ES will annunciate a pre-alarm
with text of DPF REGEN INHBTD. The DPF regeneration inhibited
symbol, shown to the right, will accompany the text when the pre-
alarm appears on the DGC-2020ES front panel.
• DPF Soot Level Annunciation
The DGC-2020ES annunciates DPF Soot Level pre-alarms which are described in the following
paragraphs.
o SOOT LEVEL HIGH Pre-Alarm
This pre-alarm is annunciated when one of the following occurs.
A DTC is received with SPN 3719 (Diesel Particulate Filter Soot Load Percent) with
FMI = 15 (Data Valid But Above Normal Operating Range Least Severe Level)
SPN 3701 (Diesel Particulate Filter Status) is received with a value of 001
(regeneration is needed – lowest level)
The pre-alarm text is SOOT LVL HI.
The DPF symbol, shown to the right, accompanies the text when the pre-alarm
appears on the DGC-2020ES front panel.
o SOOT LEVEL MODERATELY HIGH Pre-Alarm
This pre-alarm is annunciated when one of the following occurs.
A DTC is received with SPN 3719 (Diesel Particulate Filter Soot Load Percent) with
FMI = 16 (Data Valid But Above Normal Operating Range Moderately Severe Level)
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