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Old 05-24-2022, 08:41 AM   #1
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Anyone else have this message pop up?

I was on a short relocation trip in our 2018 Entegra Anthem, when a message came up on the DIC which said DPF REGEN ACTIVE. The coach didn't run any different, and the check engine light never came on. After a short while, it disappeared. After some research, it appears that the message is telling the operator that soot is building up due too low exhaust temperatures, and the computer will inject raw fuel to burn it off. Is this the correct interpretation of this message? It only seems to appear on short jaunts. Any help/imput is much appreciated, David
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Old 05-24-2022, 09:06 AM   #2
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You motor is doing a regen all by itself and only sharing that news with you. The computer had determined the DPF needed to be clean and temperatures got high enough during operation for the regen to start.

Normal - the only possible caution would be to make sure (as always) that the area around your exhaust pipe is clear of combustible materials as the exhaust will be hotter than normal - if you're driving - don't worry you're just burning soot off and expelling the resulting gas/dust.
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Old 05-24-2022, 09:29 AM   #3
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Quote:
Originally Posted by Gowenfast View Post
I was on a short relocation trip in our 2018 Entegra Anthem, when a message came up on the DIC which said DPF REGEN ACTIVE. The coach didn't run any different, and the check engine light never came on. After a short while, it disappeared. After some research, it appears that the message is telling the operator that soot is building up due too low exhaust temperatures, and the computer will inject raw fuel to burn it off. Is this the correct interpretation of this message? It only seems to appear on short jaunts. Any help/imput is much appreciated, David
YES, the DPF regen is an "automatic" thing, but it costs you $$$ in fuel used to burn off the soot that has built up inside the DPF. "Normally" the excessive soot is caused by extensive idling and / or not driving the chassis "hard enough" to elevate exhaust temps that would have helped keep the filter clean enough to prevent going into regen.
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Old 05-24-2022, 03:13 PM   #4
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Also when in regen do not turn off your engine.
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Old 05-24-2022, 03:30 PM   #5
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It's just doing a regen. It's nothing to worry about, there's nothing wrong with your rig or your driving. It's a normal process. It's safe to shut down while the regen is in progress, it will just pick up and start again next time it's needed. Just be careful of the exhaust because it will be hotter than normal.
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Old 05-24-2022, 06:34 PM   #6
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Gownfast may have miss understood just how the DPF actually works. It catches the soot as it leaves the exhaust side of the engine. If you look at a tail pipe on a pre emission engine vs. post emission, you can see the difference. Pre DPF engines have black soot built up on the inside of the tail pipe. Units with a DPF have clean exhaust pipes. The DPF catches the soot. As soot builds up in the DPF tubes, it raises the back pressure in the system. When it reaches a predetermined level, the computer calls for a Regen. If the unit is at operating temperature and in operation, the Regen starts passively, in some cases without any notification to the operator. Additional fuel is injected into the exhaust that ignites and raises the exhaust temperatures up above 1100 degrees. The higher temperatures causes the soot to burn off (pulverize) lowering the back pressure to a normal level. Depending on the unit’s condition, it can take 20-30 minutes for this process. During the passive regen, if your road speed gets under 30 mph., the HEST light may come on for a short period to let you know you have high exhaust system temperatures and to be cautious where you park the vehicle (on grass) or to let a mechanic know before he gets under the unit for service. I believe that is what your system was telling you when it showed DPF Regen Active meaning the exhaust system is hot. The DPF pressure got to the point where a Regen was needed. Regen will not occur without additional fuel being injected. Regular road speed or running a unit “hard” does not get the temperatures high enough or long enough for this process. If a Regen is called for and the unit is not in operation, then a light will illuminate letting the operator know to do a parked Regen or take the unit on the road for a passive Regen. Truck and engine manufacturers use different lights and symbols to identify the emission Regen steps, but in general, they are similar.

Excessive idling will increase the soot load slightly, but no matter how it is operated, you can not eliminate soot and the Regen process. It does require additional fuel, but not a significant amount. As mentioned earlier, you do not feel or hear anything while this process is running. By catching the soot, they have reduced one of the most significant pollutants from a diesel engine. In an engine seminar, it was explained to us that the amount of soot one 1996 road tractor generated in a year equals the same amount of soot as 4,000 - 2010 tractors today. A puff of black soot between gear shifts or a big cloud of soot as a bus pulls away from the curb were common place 20 years ago. But the systems designed to solve this are complex and expensive to maintain.

Now DEF is another matter !
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Old 05-25-2022, 07:15 AM   #7
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Thanks to all posters for the useful insight on this message. I really appreciate all the help, David
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