PEC017
5/3/2018 Page 89 of 105
All Manual HC Desorb and Auto HC Desorb notifications refer to HC Desorb as a
“Regeneration” or “Regen”.
If PTO is active, Auto HC Desorbs may occur but will not change engine speed.
Engine speed needs to be greater than 900 rpm for Auto HC Desorbs to be enabled
with PTO active.
HC Desorb differs from DPF Regenerations in that there is no additional fuel dosing
during an HC Desorb. As a result, tailpipe temperatures will remain below 500 °F (260
°C).
Desorb Notifications on the Driver Display
Figure 20.1 shows an example of the notification displayed while an Auto HC Desorb
is in progress. This applies to both Peterbilt and Kenworth on non-VECU, NAMUX 2 &
3 trucks.
Figure 20.1 – NAMUX 2 & 3 Auto HC Desorb Occuring Notification; Left: Kenworth, Right: Peterbilt
Figure 20.2 shows an example of the countdown timer notification before an Auto HC
Desorb is started, counting down from 120 seconds. The Auto Desorb will start when
the timer reaches 0 seconds. This applies to both Peterbilt and Kenworth on non-
VECU, NAMUX 2 & 3 trucks.
Figure 20.2 – NAMUX 2 & 3 Auto HC Desorb Pending Notification; Left: Kenworth, Right: Peterbilt
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