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Discussion Starter · #1 ·
Hi all,

Last day of warranty and truck throws a P1478 code, bad soot sensor in tail pipe. Install latest update, still throwing code. Sensor breaks when tech trying to remove.I get a new exhaust, DPF pressure sensor, 2 EGT’s and a soot sensor all under warranty.
Dropped truck off with soot level at 28% and 75 miles since last regen. Pick it up and soot level at 76% and 80 miles since last regen. I take the truck on straight highway drive of 400 miles. First regen with new DPF at 387 miles. I get to my destination off highway and DPF at 60% and I’ve driven 116 miles. Before I was getting 550+ between regens on the highway and about 250-300 between regens with city and light highway driving. We’ll see what happens on the 400 mile highway trip home
Just very strange a new DPF would get worse regens than the old one with 28K on it. There doesn’t seem to be a calibration. With truck off the DPF delta pressure is zero so I think it’s at least calibrated for zero. I want to make sure everything is OK and then the truck gets a tune but not before I know the crazy emissions system is working properly otherwise it’s going back to GM again.
 

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You may have to let it go through a few cycles to see where it actually settles out. I would hate to think that one of the sensors is not giving the proper range causing more frequent regens.
 

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Discussion Starter · #3 ·
You may have to let it go through a few cycles to see where it actually settles out. I would hate to think that one of the sensors is not giving the proper range causing more frequent regens.
Yeah me too. I have another 400 mile drive home so I'll see how that goes. It seems to be giving strange readings. As mentioned above it was at 60% after 116 miles. I drove around Akron a little, maybe 20 miles and didn't have OBD Fusion running and when I plugged in next it was reading 38%. So either it did a regen and I didn't know it or somehow it started ticking backwards with around town driving. I don't think I drove enough continual miles for it to complete a regen so I think it actually started ticking backwards. We'll se on the ride home.
 

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Yeah me too. I have another 400 mile drive home so I'll see how that goes. It seems to be giving strange readings. As mentioned above it was at 60% after 116 miles. I drove around Akron a little, maybe 20 miles and didn't have OBD Fusion running and when I plugged in next it was reading 38%. So either it did a regen and I didn't know it or somehow it started ticking backwards with around town driving. I don't think I drove enough continual miles for it to complete a regen so I think it actually started ticking backwards. We'll se on the ride home.
My truck shows soot buildup really fast when not on the hyway. But once on the byway you can watch it drop like a rock. Then I pull off the hyway and it builds fast. Then back on the hyway and it drops again.
My concerns are how quickly it plugs up when not on the hyway.....
 

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Discussion Starter · #6 ·
So got back from 850 round trip to Akron. When DPF was replaced the tech reset the DPF life in the computer. Way out it did a regen on highway at about 400 mile (first regen for new DPF). My "miles since last regen" in the computer said like 450 which was more than the first regen. I got to Akron and in about 116 miles it showed 60%. I drove two 10 mile trips (half local, half highway) then I noticed the DPF was at 38% and the miles since last regen was 208 which I thought was very strange like it had done a regen within 130 miles, at least 75% of which was on the highway. Then on the way back home on the highway it did another regen at either 468 miles or about 330 miles depending if it did a regen while I was out in Akron. The miles since last regen now shows 408. I pulled into the driveway and the DPF is showing 8%. I'm going to need to monitor the DPF % very closely to see if it's doing a regen with city miles like every 100 miles or so which would be a problem. Maybe I need to do another cleaning with Hot Shots Diesel Extreme which seemed to double my miles between city regens after I did the cleaning. Prior to Hot Shots I was going about 150 miles between city driving regens. After I was getting about 250-300 between city regens. I'll post an update when I know more.
 

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This is why I like my I-dash from Banks. It let me set up to 8 settings on up to 5 pages. If you look you can see I have the bottom left set to regen. It will show "OFF" or "ACT" if active. It's interesting to watch because different things will interrupt the regen and then when conditions are back to where it's happy it will continue.
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What I like is how I set the bottom two on this page, the left is how many mile I have driven since the last regen and the right is how far I went on the prior cycle before a regen. Great little gauge, plus It data logs how can you hate that!

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