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2025 Cummins Regen Observations
- Thread starter scdo
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Mopar73340
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“DPF Stat” just means weather it’s in regen or not
ZF.Transmission.Guy
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So I found this gentlemen saying at the 8:45 mark, "This truck does lock up first gear on exhaust brake. ...on decel it definitely locks up on first gear and slows you down."
My apologies for not knowing 100% if the torque converter would lock in this situation. However, trust but verify. See if you can do it in your truck how I described earlier in the thread, or with a load on a hill with ERS locked into 1st gear.
My apologies for not knowing 100% if the torque converter would lock in this situation. However, trust but verify. See if you can do it in your truck how I described earlier in the thread, or with a load on a hill with ERS locked into 1st gear.
Agree this option had to be enabled via AlfaOBD/JScan on older trucks (as I saw on my 23). On my 25, the option was available in settings without having to tweak anything.
At 4996 miles got the message to see dealer was at the end of 500 mile camping trip pulling a 12k 5 er didn’t make sense made it the last 180 miles building up soot unloaded the trailer went to take to storage. Started up no more dealer message but the don’t turn off drive doing a regeneration message. Hour of mostly 75-80 mph need to stop for gas went from 75% full to 50% bye time got to dealership it was done. They did recall tested trl brakes set on heavy electric but trl not braking good and dash said light electric supposed nothing wrong
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PyroJoe
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Mine finally went into another regen around 1650 miles at a pretty terrible time. Truck had been parked in the shop as I was outfitting it. I'd pull it outside to work on it and pull it back in. Lots of starts/stops the past 2 weeks, and I noticed it started going into elevated idle almost immediately after startup. I wish it'd let you postpone until you're ready to go hop on the road.
Anyway, yesterday was time to start the towing break-in. I hooked up the empty 20' car trailer and hit the highway. Regen was done in <60 miles. About 30 miles in, I stopped to visit with someone and left truck running. You cook a hotdog from the tailpipe it was so frickin hot. I noticed with the OBD MX+ that it'd change status from 0 to 1 when in regen. I also noticed during cold startup, when in park it'd change to 1 and go to regen, but when I put my foot on the brake, it'd go back to 0. I'm not sure when it actually started back up once I started driving. I checked all of the dash gauges when the MX+ indicated I was in regen, but there were no indicators anywhere I could find telling me I was. Again, 7" cluster which others have mentioned used to show regen status.
Anyway, yesterday was time to start the towing break-in. I hooked up the empty 20' car trailer and hit the highway. Regen was done in <60 miles. About 30 miles in, I stopped to visit with someone and left truck running. You cook a hotdog from the tailpipe it was so frickin hot. I noticed with the OBD MX+ that it'd change status from 0 to 1 when in regen. I also noticed during cold startup, when in park it'd change to 1 and go to regen, but when I put my foot on the brake, it'd go back to 0. I'm not sure when it actually started back up once I started driving. I checked all of the dash gauges when the MX+ indicated I was in regen, but there were no indicators anywhere I could find telling me I was. Again, 7" cluster which others have mentioned used to show regen status.
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Cowboyshea
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My 25 just did its first regen last night at 675 miles , 23 total hours of run time . I use a scan gauge to monitor . Regen started immediately ( went active) on a coms engine start after truck was parked couple days . Didn’t even wait for it to warm up. EGT quickly went over 1000 degrees and it took 40 minutes / 51 miles of driving to complete . My DPF was at 22% when it started and dropped to zero near the end of the cycle. I stopped for fuel 35 miles into the cycle and it resumed immediately on start up after my stop. If you don’t like to stop the truck until it completes the regen plan on driving for about an hour!
Cowboyshea
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Correct!! My 25 just did its first regen and I was seeing EGTs well over 1000
PyroJoe
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Nope, even with all this weight behind me, it still wouldn't automatically downshift into 1st to trans-brake when coming to a stop.
Edit: While editing my video of towing this load, I was able to see/hear it appear to remain locked in 1st and slow the truck from ~11mph down to ~7mph before it appeared to unlock and coast. It happened in the blink of an eye. I didn't tow up any hills, so I wasn't able to play with trying to get it to lock in 1st while accelerating.
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Could you tell how many miles/hrs/idle hrs you've done to this first regen point?
Cowboyshea
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675 miles, 23 hours and 4 idle.
After ~ 4,000 miles, my regens continue to trigger around the 24 hour mark. Interestingly, driving behavior (short tripping vs long haul) makes less of a difference on the DPF guage. Either way I've been making it the full 24 hours. Regens for sure are taking much longer than the older design though I'm not sure that really matters.
Also, I do agree with prior comments that the DPF gets up to around 1,000 degrees during active regen. I was monitoring a different EGT that was lower (previously showed 1,000 on the older truck).
Also, I do agree with prior comments that the DPF gets up to around 1,000 degrees during active regen. I was monitoring a different EGT that was lower (previously showed 1,000 on the older truck).
m.stephen.miller
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I agree and have been finding the same. I also tried running with some Archoil AR6500 in the tank and the DPF (EVIC) stayed at 0% for the full 24 hours, with a mix of towing, highway, and short-trip.
It's a bit strange that using AR6500 could cause DPF calculated load to be at 0% for 24hrs.
Maybe someone could verify if AR6500 has some impact on exhaust temperatures?
From what I understand - it should increase temperature just like the DOC does to allow for passive regeneration.
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PyroJoe
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Went on vacation and was finally able to really put this to the test, pulling a load down an incredibly steep & winding hill into the campsite. The 1st gear lock-up is freaking awesome.
Another observation on the regens - mine seems to do some type of regen when the DPF gauge is reading 0% full. This is just based off the smell and intense heat of the exhaust. I haven't plugged the CTS3 back in since it killed my batteries, so I don't have any technical specs to contribute. Waiting for Edge to offer official 2025 support before I attempt that again. They said they're diligently working on it.
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24 hour regen?
PyroJoe
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It happened right around 82 engine hours.
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If you’ve had any soot based regens or possibly an ECM update it can reset the clock. The clock starts over at the completion of an active regen.