REGEn hasnt come up in almost a year

[ram2016]

2016 - dpf would not self clean and was stuck at 100% even after driving on highway for 45 minutes 75+mph. Chrysler repaired(new one). since then I have not seen a regen display pop up since? used to be almost twice a month. don't know if I had gotten a lemon because its custom ordered or this has happened to someone else.

 

[EDankievitch]

Depending on how you use your truck it will go into a passive regen cycle and you'll never know it. Enjoy it you'r not wasting fuel or contaminating your lube oil this way. When I do short trips as soon asI get on the highway it'll go into regen. When I drive highway a lot it'll never regen.

 

[kthaxton]

It sounds to me like they fixed it. You get no indication of a normal, active regen....you only get notification if the DPF has reached a critical point in being plugged.
Noteassive regen is really not a "regen" at all (i.e. the computer is NOT in regen mode), it is when the truck is being worked hard enough that it generates enough heat on its own to both produce little soot and burn out the soot in the DPF.

 

[EDankievitch]

If you'r running down the highway, towing or climbing a hill the exhaust temp will be high enough to light off the DPF and allow it to clean out aka regen. And if the DPF burns it self clean it will not trip the exhaust pressure sensor there for the computer will not ask for a regen or dump the extra fuel down the tailpipe. Passive REGEN.

 

[kthaxton]

Just for clarity:

https://cumminsengines.com/cummins-particulate-filter

What is passive regeneration?
Cummins engines are designed to maximize the use of passive self-regeneration. This occurs when operating conditions maintain sufficient exhaust temperature, therefore enabling continuous oxidation of the PM. Passive self-regeneration is completely transparent to the operator and does not affect the machine’s operation or performance. Cummins field test results have shown that most off-highway equipment operates at a high enough engine load factor for the Cummins Particulate Filter to self-regenerate in passive mode the majority of the time.

What is active regeneration?
Active self-regeneration occurs when there is not sufficient heat in the exhaust to convert the PM being collected in the DPF. Exhaust temperatures are raised by injecting a small amount of fuel upstream of the Cummins Particulate Filter. The resulting chemical reaction over the DOC raises exhaust gas temperatures high enough to oxidize the PM from the filter. This is all done without any operator intervention. Cummins Tier 4 Interim system is designed to minimize the need for active self-regeneration. The overall fuel consumption increase due to active regeneration of the particulate filter is barely measurable – approximately 0.1% for most applications. This minor increase resulting from active regeneration is included within Cummins overall Tier 4 fuel efficiency improvement of up to 5%. Cummins field tests have proven the majority of active regenerations will be less than 1% of the total operating time.

 

[AH64ID]

IIRC passive regen takes around 1200°, or higher, exhaust manifold temps to occur enough to clean the DPF. It's a much higher engine load than just running down the highway empty, or even towing most of the time.

Active regen will not actively indicate it's occurring, thou many can see it by watching the instantaneous mpg gauge,

 

[Newsa]

IIRC passive regen takes around 1200°, or higher, exhaust manifold temps to occur enough to clean the DPF. It's a much higher engine load than just running down the highway empty, or even towing most of the time.

Active regen will not actively indicate it's occurring, thou many can see it by watching the instantaneous mpg gauge,

Tech's on this forum have said it will go into active regen after a certain preprogrammed amount of time/miles even if the DOG pressure doesn't trip it.