Same problem. Its time for another class action lawsuit.

Same thing with my 2023 3500 GMC AT4. I was on my way to Yellowstone from California and upon climbing HWY 80 by Donner Pass towing my 41ft 5th wheel, it did the exact same thing you explained in your video. The only difference was that when I bought a code reader at oreilys,(the good one) about 180$, it did not clear the codes. I had to physically disconnect the batteries to reset the codes. Then I could use it normally unless I was climbing up a hill. I figured out that if you let off the throttle right away when you feel it about to hesitate or shift hard from 6th to 7th it lets the RPM's go down and it shifts smoothly or put it in neutral , let the rpms go down and put back in gear. I did that alot. LMAO... I continued my vacation and didnt let our Yellowstone trip get ruined because of a bad Valve body. LOL The best thing to do is let the tranny rest or cool down to have better effectiveness of it delaying the code or symptom again. But its still under warranty as i have only 28k miles.

If you shift to neutral before it goes to limp mode and shift back to drive it will shift into the next gear. My truck does it 6-7 gear. I just shift to neutral and then back to drive and it will shift into next gears without issues. Hope this helps everyone with this junky valve body

It’s because it’s a Chevy transmission badged as a Allison

I'm having the same problem with my 2023 GMC2500 HD smh!! thanks for the great video my guy! now im gonna sound like i know what im talking about when i go to the dealer in the morning !

I have a 2024. Same problem… Just sold a Powerstroke with 228,000 miles and never had an issue.

I just experienced the same exact issue that you described here. I have a 2020 GMC Duramax daily, bone stock, which i bought new. I had the transmission fluid and filter changed less than 5 days ago and im now sharing in your frustration! Zero issues before now. Im starting to second guess my decision on preventative maintenance.

Same thing! 2020, 3500. No mods and it’s downshifting from a high gear to either park or 1st gear while going faster than 60 mph. It locked up and did this too me at 80 mph pulling a trailer. Here’s the thing, no codes and the dealer is refusing to fix it. It’s my business truck and my daily. I depend on this truck for my livelihood and I’ll never buy another one. I know all makes and models have their issues but I really believe I’m going to die in this truck and or other people with me.

Same thing on my 2023 2500HD. Replaced the valve body last month (31 days in the shop) and now doing it again.

Thanks for posting this. Mine did it with 26K miles. 1-1/2 Months on backorder, just got the call that the parts are coming in but now wondering if it will just do it again. Wish I had my 17 Ram Cummins back.

Same problem, 2023 Sierra 3500, 20k miles. Left family and cargo trailer stranded 500 miles from home the first time. Warranty covered the tow of the truck, but they said the trailer was my problem as was getting back to the dealer to pick up the truck. First dealer cleared code and said nothing wrong with it. Did it again 2 weeks later and it has been at the local dealer ever since, which will be 40 days ago tomorrow. Dealer said it would be "several weeks" and they had over 30 valve bodies already on back order!!

I’ve owned 3 in a row, over 700k miles total, towing some heavy trailers including a 42’ toy hauler. Never an issue. The only problems I’ve had were with the F’ed up DEF system

I have a 2023 Silverado 2500 custom 23k miles. Same issue. It’s been at the dealer ship for a month now and now parts yet. My brother has the 22 2500 and his truck is beside mine at the dealer ship waiting for a valve body. The dealer said they’re 2 more in front of ours waiting on valve body’s. This is my first Chevrolet. I switched from rams because of transmission issues and now I’m at the same point with Chevrolet.

I have a 2020 Duramax with the Ten Speed transmission. Had a limp mode issue all of a sudden while not pulling anything. Dealership replaced the TCM and fixed the issue. That was 80,000 miles. Now at 118,00 miles, today while pulling a 42 foot fifth wheel from Bangor ME headed for o KY, it did it again in NY state. I limped the camper into a campground and have a dealership set to look at it at 8am in the morning. Sure hoping they can get it going so I can get home. First time I have ever been dead in the water with a GM truck since 1995. I travel country wide and never had an issue with my 2017 Allison 1000.

I had the same issue 2024 2500HD only 17k miles and the check engine light came on codes came back as solenoid stuck open I’m like dang brand new truck and having issues already

I've been without my 2021 2500 for almost three months now. Started with a slight slip/hesitation between 2nd and 3rd. Then escalated to redline RPM's and no movement from a dead stop. Brought it to the dealer and they replaced a valve body in about 1 week. Pulled out of the dealer and within 10 miles I had to pull over on the highway because the truck lost forward movement at about 65 MPH. They took it back, "tore down" the transmission and said they had to order a part and a wiring harness, which took 2 months to come in. Got the truck back last week, drove about 8 miles, same thing. Back to the dealer. I opened a case with General Motors but they've been no help at all. Got a call two days ago that the truck was ready but the mechanic was going to take it home and drive it all weekend, which I thought was great idea. The dealership called me yesterday and said the mechanic experienced "a different issue" but thinks they were able to pinpoint the problem based on this new issue. From what I've been hearing and reading online, this new 10 speed is problematic. Your video is 8 months old, hopefully they were able to resolve your issue. If they were, and you know what the problem was, can you share it please?

My 2021 that I've had for 6 months now has 140k miles and is having a similar issue. I've lost reverse and only have 1st gear in drive. Dealer says valve body. Has anyone considered or know if one could swap these 10 speed junkers out for the old 6 speed like the previous l5p had?

2023 3500. 60k miles and it’s having a similar issue with second and third gear. Just had the valve body replaced and still having a hard shift. Bummer

We have 2 1500 with durmax engine and the both are having valve bodies replaced 29,000 and 12,000 miles. Seems like they have a problem

I have 2023 GMC 3500HD with 10 speed Allison, currently have the same issue, very frustrating! its been in the shop about 3 weeks now, and they are saying that they don't have parts..now this morning there's recall that saying there's recall about tailgate..

Same problem here 2021 duramax, replaced tranny 3 different times on a 55,000 mile pickup, does trans tuning cure this problem?

I’m having the same issue with my truck is there a class action law suits I can join?

Output speed sensor ???? I don’t have the 10 speed but was having issues and changed sensor it’s working 100% for past 60 days good luck

My ‘23 3500HD with only 15k miles just did this same thing this afternoon. We were getting ready to go camping for a long weekend. I pulled P0700 and P0747 codes. Looks to be the same issue as everyone else. Super frustrating for a 92k price tag.

5:36 PST yep same year here, same problem. I was told there is not even a valve body available. No idea when they will get the part. Ridiculous. Mine is also my work truck. No rack, no tools, how do I work. I am pure Chevy, got a bowtie tattoo. Seriously displeased. I am in Oregon. Sounds like it is happening everywhere. Bummer. My 2016 never has had a problem and I beat on it more than the new one. Ugh! At the almost 2 month mark they finally put a new transmission in it.

I just got a 2024 gas and it blew the transmission at 930 miles. No date from the dealer on when it will be fixed. Lost 5th-10th and reverse

We have been broke down in Smyrna Tennessee for 3 weeks with exact same problem and waiting for the dealership to work on it and ours is a Chevrolet 2022 with only 16,000 miles and we don’t know what the do cause it pulls our 5th wheel

Same thing happening if you wanna spend the money next gen drivetrain sells part hella expensive though but no wait time for valve body

I’m experiencing exactly the same 2023 GMC Sierra 2500 diesel 78,000 miles bought scanner OREILYS and clearing out code also neutral while rolling let rpm down put in drive and it relaxes the shift and performs normally

I’m in the same boat as everyone else. Truck has been in the shop waiting on parts for a month and a half. Has anyone out there gotten any compensation from GM for not having a truck for months??

When you obtained your banks IDash did you get the inline tuning module? If you did get this module what tune is it on? its got 5 presets. I had a very similar issue on my 2022 Duramax L5P. When you run higher levels of power on this transmission you need to also increase the transmission line pressure to avoid "Funny" shifting and behavior. Long story short mine would sputter really bad when trying to downshift from 10th to 9th on the highway to pass but would clear up as soon as i let off the throttle. The only thing you can do to increase line pressure is getting an aftermarket TCM with proper corresponding tunes.

I have a 2023 GMC 3500 with 35,000 miles and I am having the same issue. Brought it to the dealer and they told me 4-6 weeks for repair. Very frustrating

I’ve been experiencing this same issue in my 2022 3500at4 Duramax since about 12,000 miles. My truck will not throw a check engine light but had complete power loss and truck acted like it died when it downshifted when pulling a hill while towing. Transmission has minor slipping weekly since 12,000 miles. I’m currently suing GM in a Lemon Lawsuit because the dealership refuses to fix and GM denies fault. My truck currently has 37,000 miles on it and has had persistent transmission issues for over a year and a half. Frustrating to say the least.

Having same trouble with new body Escalade under warranty but cannot be fixed and no repair date available and Cadillac doesn’t care and will not call back and vehicle is sitting at dealership or 3 rd time in 3 weeks no rental offered just was told gm doesn’t give a shlt about you or your vehicle 100k and we walking! Thanks gm loving this Cadillac experience

I have the same truck , having the same issue , sticking in 3-4 only get to 45 mph, been waiting a month and half, according to gm the valve body was milled to small for the shift solonoids,under warranty 50,000 miles. You can shut off the truck open the door and restart and it will reset for a little bit. Good luck it will work a few times until it doesn’t . I’m out off commission until I get to my appt, 2 more weeks

Just had my 23 gmc 3500 srw towed to local dealership. 6.6 with the 10 spd. I’ve owned the truck for 2 weeks bought it used from gmc. When downshifting it will clunk horribly metal on metal and send it into limp mode. Reset the code and it runs fine for a week. P0700 code with no other code on the reader I have. I do 70k a year I’m about to buy a low mileage 7.3 again and wait until these spacetrucks get the technology caught up with the sales pitch. Dale problem I rely on it for my business and the only local gmc trans tech has been on the same vehicle for 3 months. Welcome to 2023

Sorry to hear about your truck. I have a 2022 GMC Sierra refresh 1500 duramax. My transmission is also experiencing a stuck valve and the dealer only has 1 transmission tech. So I’m waiting to take it in later this month. With that said, even if they fix the problem, have you heard that it will happen again? I really enjoy the truck, I went from a 2005 GMC Sierra with the 6.0 gas engine to this diesel. It’s my first time owning a diesel and I mainly chose the diesel because of the great gas mileage. I’m just hoping that this is not an ongoing issue. I Aside from wanting a new truck, my main reason was to avoid any major engine or mechanical issues. I just hope this isn’t a defect on the part of GM? Thanks again for the video.

My 2024 Duramax had trans fluid dripping in the first week. Havent seen anything since. At 6k miles now. I remember my father buying a new 2001 dodge with a 5 speed manual. Id rather have a manual. BUT. He then broke the transmission 3 times in first 60k miles. Last time in middle of Georgia. Lucky he had money to fix and time. He spent a week at a little shop. They installed a allison. And the truck went to 250k no problem. That was a REAL allison

This just happened to mines! WOW . 2023 gmc 2500 Denali

Dam same old shit!!!

So sorry man! I hate when something like this disrupts life. I have a 2022 Trail Boss Duramax half ton with the 10 speed transmission. It has been at the dealership for a month waiting on a valve body. I hope they figure it out. No ETA on when the part will be in from GM.

My first experience with an HD truck but my 2023 2500 GMC w/30k miles has been at the dealership for a month tomorrow, and I’m being told the valve body is on “indefinite backorder”. I was also told that they currently have 5 trucks waiting on the same part. Seriously, how does a product fail at this high of a rate?

Did gm replace your tranny? I just had this happen for the 2nd time and only 5000 miles on the truck. They did the valve body the first time, hoping they will replace the whole tranny

Dude holy crap. I was looking at trading in my 09 duramax for a newer duramax but after looking at and reading all of these comments its definitely starting to make me think i should just keep my 09. Hate to see the newer trucks having this many issues. My truck has been super reliable.

Is there any law firms that can help on this issue this is really upsetting that’s the reason we buy new truck so we have something reliable

2022 Hd 21000 miles! Happened to me day before yesterday! Driving down road at 55 then it down shifted to 2 or 3rd and went into limp home at 35 mph! Now I’m waiting on a valve body! No time given! Wasn’t even towing Anything!

Same thing is happening with my 24 2500 gasser, been at dealership for 3 weeks. They’ve been throwing parts at it but seems like they’re still having issues.

I have the 2023 DuraMax 3500 6.6 Hd and it’s doing the exact same thing you said yours is doing in this video. Check engine light comes on and then the transmission makes a noise and then it pops up on my screen “ speed has bee reduced “ and i can only do about 45mph

I have a 2022 GMC 1500 Denali 3.0 Diesel and my Transmission Body Valve went out. They had my truck for 3 weeks called me to tell me that a new Body Valve came in and I could pick up my truck the next day. They called me the next day to tell me that the part was defective and they had to order another. It’s been 5 weeks now with no word of when my truck will be fixed. The only good news is they gave me a brand new Elevation to drive which I have put about 1,400 miles on. However, it’s not my Denali!

How do we go about opening a a complaint against Chevy or a lawsuit

The issue on the GM 8 speeds was due to the wrong fluid. The original fluid grabbed too much moisture from the air. Mobil1 came up with a fix and they even slightly revised that one more time. With the proper fluid via a triple flush from the dealer, the 8 speeds eventually worked very well. I wonder if these 10 speeds need a better/different fluid? Have a Ford Super Duty Powerstroke on order and was looking to order a 24 Sierra 2500 HD AT4X diesel, I'm disappointed to see so many of these HD 10 speeds having issues that GM can't readily fix.

My 2023 is in the shop for the same exact issue.

On the same boat I wait for it to cool off then works trading mine in asap 23 2500 hd 25k miles dealership says will take months to get to it

So far, so good with truck. Tail gate was going down on itself when it was below freezing. For a recall notice about that, with no solution yet.. no big deal. Other than that, truck has been great so far... I’m sure something will fuck up though.. hope not. These trucks cost quite a bit. Got this to replace my 6.4l 2008 f350 with highish mileage.

Are you thinking about trading the truck in if they can’t fix the problem for good?

Have a 2023 3500. 20,700 miles drove from durango to pagosa and this exact same thing happened once I got into town. Very frustrating

I have a 2022 2500 Duramax ot has 145k on ot and just had to have the trans replaced at a cost of 9k. They replaced the whole trans. Only because they could not replace the valve body.

Does the 6.6 gas and Duramax use the same 10 speed tranny?

My 2020 denali trans gave out at 10,000 miles and it was stock just lift on 37s .

2023 2500 28000 miles was told bad valve body was bad same issue no parts a available and no can’t give me a date when it will be fixed

2023 GMC Denali 3500 HD 30,000 miles. the same problem, a New Valve body was needed, Took two weeks to the day to get it repaired,

Time we all get together and make them do something like they did for the 8 speed class action lawsuit

Maybe I should get the baby cake Colorado zr2 instead of the hd zr2. This GM starting to make me wonder if I should stay loyal. My 07’ Tahoe Ppv still strong but I want a nice (new) dailey in Houston. I’m sorry, brother. GM is really messing up lately

Wow... Just had this same issue on my 2020 2500HD LTZ(94k miles) about 3 weeks ago. Been sitting at the dealership for 3 weeks, no loaners vehicle, and they're trying to give me shit about my Edge Cts3 monitor saying they need to check the calibrations because I have a "tuner" on my truck. Its BONE STOCK, never been touched! I see from this video and the comments that im about to endure some bulls*** from the dealership. To add insult to injury, they're telling me a valve body is about 3 months out and a new transmission is about 6 months out. UNACCEPTABLE!!!!!!!!

With all the information on GMC quality it surprises me anyone buys these proven unreliable vehicles. I will say its a great looking truck.

Currently waiting on my 2023 Duramax 3500 with a valve body issue. Been 3 weeks. The part is in such demand due to failure GM cant make enough. Bought the truck new for almost 90k. Only 18k miles on it. GM is still manufacturing trucks that will have the same issue. Im about ready to sell it and get a Cummins.

How do we go about opening a lawsuit against Chevy

2022 with 19,000 miles too. Shouldn’t be having a problem

Did they ever come up with a fix? I have a 2020 sierra 1500 diesel with 52k that is having trans problems. They believe it is valve body.

My 22 trans went completely out at less than 12k miles

I HAVE A 2023 GMC AT4 3500 ON MY 2ND TRANSMISSION AND IT JUST WENT OUT AGAIN IN VEGAS AND I LIVE IN ARIZONA NOT HAPPY AT ALL WITH ONLY 40K MILES

Same thing happened to my 2023 Chevy Silverado 2500 28,000 miles truck is now at the dealer undergoing a total transmission replacement been there for 3 weeks now

Gmc 3500 gmc sierra 2023 just had the same issue they replaced the valve body also truck had 27000 miles

Mine just did the same thing today! Sucks!!!

I’m having the same issue 22 Yukon 5.3 50k miles

just happened today on my 23 gmc sierra 2500, 40,000kms trucks at the dealer

Let’s go Brandon You got my subscription

no problems so far 4 k miles 22 2500 ltz

Having same issue with a 2024 2500 he dramas with Allison

having the same problem.

Mine hard shifts on the 5-6

i just experience today de hard shifting on my 23 duramax 45 50 mph stock on 4 or 5 gear am desapointe now

2023 Denali 3500. Biggest piece of sh*t I’ve ever owned.

I’m having the same problem 2023 24,000

Shit I’m never selling my 2013 Dmax

GM is having real issues with transmissions, the 8 speeds are having even bigger problems. After having a problem myself, I've opted to trading them in every year or so. Remember on 8 speeds, the warranty is just 60,000 miles.

Buy a Cummins next time

My 22 GM 2500 20k miles has issues. Stays in low gear, hot trans warning..needs valve body. Prob is none in stock. On backorder. No end in sight. Going back to Ford. Learned my lesson

The new 10l1000 is gonna be the 68rfe of the 10 speeds. Better to buy a ford or dodge. Its a shame to bc the Duramax is solid

I have a 2012 Ram 3500 single rear wheel it has the 68 rfe also not the best trany to say the least. I’ve been using LE fluid which is by far the best fluid you can buy it runs alot cooler. I change yearly. 540,000 on it with trailers hooked to it daily still going strong. Stock mopar fluid i started getting a burnt smell to fluid and bits on dipstick switched to LE (lubrication engineers) burnt smell gone dipstick is clean no contamination.

Sorry to hear this but you said it yourself. Chevrolet transmission, not a true Allison. GM builds there own transmissions and slaps the Allison logo on it. Chevrolet has let down many customers by doing so. I have an 02 2500 8.1 Allison combo that pulls like a freight train and on the transmission is a Allison stamp..

That’s what happens when Chevy works with ford instead of Allison a real transmission company

I have a 22 gmc that has 30k miles and it completely grenaded the transmission and I’m in the same boat I use the truck everyday for work it’s my primary source of income and it sucks especially when it’s a new vehicle

So much for being a Proud Murican and giving your money to Ford, GM, and Chrysler. You get fawked without lube. Buy a Toyota and quit buying trash.

Problem is that Allison doesn’t actually make that transmission, GM does and Allison made the mistake of allowing GM to put the Allison name on it

All this drama. Why can’t we have a simple 6-7 speed manual with a good clutch. A lot more durable and simple for a truck that works hard.

If it sucks now just think once it goes out of warranty it is going to suck a whole lot more.

That's why I like lly, 5spd, you don't need anymore gears than 5 or 6 spds in a auto.

The 10 speed is NOT an Allison transmission, it's a GM tranny with their permission to use the name.

Every person I know that owns an American truck from new-15 years old has problems with them in some form or another then the warranties run out and they have huge out of pocket costs. Everything from touch screen and other electrical issues to engine and trans issues. Some of those costs are just insane ($4,000-$6,000). Then all the people I know that own a Toyota truck (4-Runner, Tacoma and Tundra's ) new-15 years old love their truck and have never had any issues with them other routine maintenance. They rave about just how great they are and will never again buy American. It's really sad the lack of quality in American vehicle manufacturing anymore. It actually angers me but I have done the same with my SUV's and past few car purchases. 2002 Honda CRV owned 5 years 211,000 mi no problems and 2008 Toyota Rav-4 160,000 no problems. These are all western PA vehicles that have seen every kind of weather they can dish up and they just don't quit.