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I'm at 4500 to 5100 feet all the time. In town is lower elevation at 4500. It is actually less frequent now but I've noticed the truck starting to do it when i'm slowing down with my foot off the accelerator and no brakes applied. Feels just like a toque converter lock up issue.
 

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It sounds like there may be a fix??

Hello all, last night the service manager from the dealership I 5163482)purchased my 19' Silverado Duramax came by and gave me a copy of a bulletin (#18-NA-334: Information on perceived longer crank, hesitation feel and / or surge - dated Feb 2, 2019 - document #5163482). It appears to me that there are three sections that may apply to my / our issue(s) (Transmission Torque Request Override, Transmission Adapt Learns and Change in Torque Converter Lock Up Strategy). He told me that he was not accepting what the bulletin was saying because he didn't feel he could go to his customers (three more complaining just last week) and tell them this is how it is and to keep driving their truck and it should eventually correct itself. So, he asked me to drop my truck off this week for a day or two and they have a procedure to perform that he believes may solve the issue. He said they have a test procedure from the GM field reps that they will perform which will probably result in from one to three sensors needing to be replaced as well as a re-flash of the computer which will reset the Adapt Learning of the transmission all over again. I will report how this goes.
 

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No the beginning of video is going over a cattle guard. It's near the end of the video. That's my video I posted to YouTube
 

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Ah, I see the cattle guard now. It sounded just like my lane departure seat vibration. Thanks for the clarification.

So at what mark in the video does the chugging begin? Is it at 10 seconds, or some other point. It's hard to hear without knowing where to really pinpoint. Thanks.
 

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Just to keep everyone in the loop.
My dealer had me bring my truck (2019 Chev Duramax High Country) in. They replaced a sensor (EGR) and "reprogrammed" the computer. The truck didn't display the problem for about 3 weeks but it has come back and chugged three times in the last 10 days. This time it has been the low-speed chugging (right at about 30 mph). I haven't had the 50 mph chugging since the re-program.
While in Idaho (southern) with my son purchasing a duramax or himself I talked to one of the salesmen who told me that he has had a new 2017, 18 and 19 and all three have had the problem. He said his dealership put the computer on and had him drive for quite some time. He insisted that the truck displayed the problem so they have it on the computer and can identify what is happening. He said that they did the same thing (replaced one or two sensors and reprogrammed the computer) and it still hasn't fixed the problem.
I am sorry but at this point I don't have much hope at all that GM has any intention of fixing the problem. I have also heard that the new Duramax is putting out more hp and GM is a little worried about the transmission which is why they short shift the transmission (which they say is causing the problem).
 

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Yup, that's it. I also get it at 30 mph. The last time it did it, it kept doing it until I let my foot off the throttle for a couple of seconds.
 

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I have also heard that the new Duramax is putting out more hp and GM is a little worried about the transmission which is why they short shift the transmission (which they say is causing the problem).
From the spec's I've seen the 2020 looks to have the same HP and torque, but the Allison is now 10 speeds instead of 6. They probably beefed it up as well. I wonder if part of the reason GM locked the ECM so it can't be programmed was the current transmission would struggle to survive if you pushed over 1000 lb ft.
 

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From the spec's I've seen the 2020 looks to have the same HP and torque, but the Allison is now 10 speeds instead of 6. They probably beefed it up as well. I wonder if part of the reason GM locked the ECM so it can't be programmed was the current transmission would struggle to survive if you pushed over 1000 lb ft.
Jman, I am sorry if I am doing this wrong but...
I think you are right on the money. The sales person pretty much said the same about the increased hp and GM not wanting to put that hp to the existing transmission. That's why they are short-shifting the transmission (I complained that the trans shifts up too fast and that's what he told me. I guess I should have waited for the 10-speed.
 

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What would the cost be to up grade to the new 10 speed? That is once it’s out and available to the public.


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Every brand has their problems, at least the GM isn't going into limp mode due to a computer/ABS sensor glitch that can't be troubleshooted because it goes away if you restart. So far knock on wood my 2019 GMC 3500 does not have any issues, I would think that forcing a transmission relearn would help with the shifts. Makes me wonder what the troubleshooting process is at these dealers.
 

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Every brand has their problems
I totally agree, but isn't it sad how we've all begun to rationalize the multitude of problems? For what these trucks cost issues should be the exception to the rule, not the rule itself. It's as though there's an arms race to release the newest gee-whiz feature but in the process quality engineering has taken a back seat.
 

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I whole heartedly believe they cost way too much, that is another factor I want to see with the 2020 GM trucks... I want to see what pricing they are at. Ford and Ram at the moment are completely insane price wise. If GM would raise their pricing from the mid seventies to high seventies for their top of the line trimmed trucks, I really do think GM could cut into the HD truck shares. I suppose "discounts" are always a factor, but I totally agree, a $75,000 truck should not have some of these problems.

Relatively speaking the biggest issue I've had with any of my diesel trucks has been a 2008 Ram that had a turbo/fuel system blow up at 16000 miles and they tried to pin it on me. They ended up fixing it and voiding my warranty. The day i got it back i traded it in for a GMC diesel... and its been 12 years since I last drove a cummins.
 

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The 2019 Sierra 3500hd I drive work does this same thing it has 2800 miles on it. The first time I felt it was 980 miles. I was told that I was imagining things, that I wasnt used to a brand new truck. Thank you for reassuring me that I'm not crazy, I really do wonder about it sometimes.
 

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What was the problem? I have the same issue while hauling on a long trip this weekend. Truck runs fine then a chug did it a few times. Need to know what the fix is before calling the local dealer since they seem to be less than on top of things. Thank you
 

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Just to keep everyone in the loop.
My dealer had me bring my truck (2019 Chev Duramax High Country) in. They replaced a sensor (EGR) and "reprogrammed" the computer. The truck didn't display the problem for about 3 weeks but it has come back and chugged three times in the last 10 days. This time it has been the low-speed chugging (right at about 30 mph). I haven't had the 50 mph chugging since the re-program.
While in Idaho (southern) with my son purchasing a duramax or himself I talked to one of the salesmen who told me that he has had a new 2017, 18 and 19 and all three have had the problem. He said his dealership put the computer on and had him drive for quite some time. He insisted that the truck displayed the problem so they have it on the computer and can identify what is happening. He said that they did the same thing (replaced one or two sensors and reprogrammed the computer) and it still hasn't fixed the problem.
I am sorry but at this point I don't have much hope at all that GM has any intention of fixing the problem. I have also heard that the new Duramax is putting out more hp and GM is a little worried about the transmission which is why they short shift the transmission (which they say is causing the problem).
I was having this issue on my 2019 duramax at 40,000 mi. I was frustrated with the “chugging” mostly because I didn’t know how to explain it in detail to service dept. then 2 weeks ago it went from mild chug to full butt chug. Check engine and safe mode. Barely made it to the dealership. After 2 weeks of them having it service says they are sending GM techs to change all the Injectors. I really hope the actually fix the problem and not band aid it til the warrenty expires. Very disappointing for a 72,000$ truck. The EPA has been ruining vehicles lately, especially diesels. I’ll post update after the surgery.
 
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