Man sorry to hear about the failure, there are a few posts about this issue circulating around the forum. But for the most part those valve bodies are super hard to came across with none in stock anywhere. My buddy is a GM tech and on Friday he let me know he did one that week on a 21' and they were able to obtain the part. Don't know if they were just lucky or maybe parts are starting to get out to the dealers which I hope it's the case.

 

That stinks. How many miles on the truck? Did you have any symptoms leading up to this? Hopefully it’s a good dealership and they’ll work to find a valve body.

I’ve got the Chevy version of the same truck/year.

 

That stinks. How many miles on the truck? Did you have any symptoms leading up to this? Hopefully it’s a good dealership and they’ll work to find a valve body.

I’ve got the Chevy version of the same truck/year.

OP is at 35k miles, what's crazy about this Valvebody issue is I see more stories of it happening in 23-24 trucks vs the earlier years.

 

Crap just bought a ‘23 with 35,000. 😳

 

I just had mine fixed for the same thing. Mine is a 2023 1500 with the lzo. Year and a half old just over 30,000 mi. I was on my way to the airport when I got an error code + the truck went into limp mode. I had to work out the tow and all of that while I was scrambling to catch my flight .

The dealer had my truck for about a week and just called today to tell me that it was fixed. I've been out of town so I couldn't really deal with it and do all the research until I just got back yesterday. As I started doing all the research and seeing that this was a major problem in taking months for a back order, I see that it was not just me experiencing this. Now i also see why when she told me that it was fixed she sounded completely dumbfounded that it came in so quickly.

I did call GM customer service the other day and explain to them that I was not trying to get anything more out of them than what I expected. I paid that much money for a brand new truck, and told them that they need to consider what this does to their brand when I have to ask one of my friends (who drives a blue oval) to take me to go pick up a trailer that I purchased and was supposed to bring home when I got back from my trip. "Sure I'll help, but what about that expensive new truck you just bought?"

 

I just had mine fixed for the same thing. Mine is a 2023 1500 with the lzo. Year and a half old just over 30,000 mi. I was on my way to the airport when I got an error code + the truck went into limp mode. I had to work out the tow and all of that while I was scrambling to catch my flight .

The dealer had my truck for about a week and just called today to tell me that it was fixed. I've been out of town so I couldn't really deal with it and do all the research until I just got back yesterday. As I started doing all the research and seeing that this was a major problem in taking months for a back order, I see that it was not just me experiencing this. Now i also see why when she told me that it was fixed she sounded completely dumbfounded that it came in so quickly.

I did call GM customer service the other day and explain to them that I was not trying to get anything more out of them than what I expected. I paid that much money for a brand new truck, and told them that they need to consider what this does to their brand when I have to ask one of my friends (who drives a blue oval) to take me to go pick up a trailer that I purchased and was supposed to bring home when I got back from my trip. "Sure I'll help, but what about that expensive new truck you just bought?"

Did you get any info on if the replacement valve body is a new design or part #? That's been a mystery as well, no one knows if GM has actually fixed the issue.

For you 23-25 guys if you suffer the issue I would be requesting the 15yr/150k extended warranty on this that they have given to the 20-22 owners.

 

I know someone who just got a new unboxed VB from GM, it’s the ”old” model, wont fix the impending cracked VB issue. If you need it, send me a PM and I will connect you up with the transmission shop. I saw it today in the box from GM, unopened.

 

I have 2024 2500 Duramax with 32,000 on it. It went to the dealer on October 29th and was diagnosed as needing the valve body replaced. After waiting for 2.5 months for a valve body, with none available, the service manager escalated the case to replacing the entire transmission. They called today to say the truck is ready to go. Has been down for 3.5 months. Does anyone know if the new transmissions and/or valve body are a new design? Or will these also fail?

 

I dont know for sure yet. I just picked my truck up last week and have not been able to connect with my GM customer service advisor directly yet. That is one of the questions that I am trying to get an answer to. I'll try again today after work, and report back here if I find anything.

 

Alright my gm tech just messaged me today, 24065357 is the new part#, the old part# is discontinued and there is no core charge like they usually do.


He said they did 4 last week so far, he is seeing an uptick in the failures.

Hope this helps, I will pass on anymore info that I receive.

 

Alright my gm tech just messaged me today, 24065357 is the new part#, the old part# is discontinued and there is no core charge like they usually do.


He said they did 4 last week so far, he is seeing an uptick in the failures.

Hope this helps, I will pass on anymore info that I receive.

No core charge so they don’t want the old one back. Which does align with the report of cracked valve bodies in the old units.

 

https://www.reddit.com/r/Duramax/s/gUeGHOS3lb

Another thread with a guy that has a 24' with dealer confirmed valve body issue. Around 30k seems to be where most of them are failing from all the posts I see on this issue.

 

I saw the same thing on Reddit, a 24‘ with 30k miles they ended up swapping the entire transmission, but they at least had the new valve body part number installed.

 

Is this the part where I drive my truck hard to get a failure and new valve body?

 

I wonder the same thing, make sure it breaks under warranty. But that's assuming it's a failure do to a specific type of use, we're not sure what exactly is causing the issue yet.

 

OP any updates on your truck?

 

Still waiting for parts no ETA , been down for two weeks and counting now.

I am also still waiting to hear from a case manager from GM

 

I hear ya, my truck had to have the pump cover leak fixed on the trans and the whole trans out before I was even to 10k miles. That left me with some bad feelings about the truck, I'm 5k out from the repair and it seems to be holding so far. I have a buddy who is a GM tech and he tells me the rumor within GM is the new valvebody is designed for better durability so maybe the redesign will prove to be an improvement for us all with the 10l.

I agree with you on how GM handles things, poorly is an understatement. Trucks sitting months on end for an issue they knew about we could say late 22' because in 2023 those trucks already came with the new software to detect the valvebody issue. My buddy's dealer had a new part# VB arrive last week and they were able to get one of their sitting trucks on the road. So hopefully they are starting to trickle out and guys can get trucks back on the road. I still say GM should make this right and do a service campaign and replace all the VB's to make things right and boost customer morale. Most people bought these trucks to pull something and breaking down traveling pulling a trailer is no fun, we shouldn't be waiting for a failure to occur on a known issue.

Hopefully you can get your truck back on the road soon.

 

I hear ya, my truck had to have the pump cover leak fixed on the trans and the whole trans out before I was even to 10k miles. That left me with some bad feelings about the truck, I'm 5k out from the repair and it seems to be holding so far. I have a buddy who is a GM tech and he tells me the rumor within GM is the new valvebody is designed for better durability so maybe the redesign will prove to be an improvement for us all with the 10l.

I agree with you on how GM handles things, poorly is an understatement. Trucks sitting months on end for an issue they knew about we could say late 22' because in 2023 those trucks already came with the new software to detect the valvebody issue. My buddy's dealer had a new part# VB arrive last week and they were able to get one of their sitting trucks on the road. So hopefully they are starting to trickle out and guys can get trucks back on the road. I still say GM should make this right and do a service campaign and replace all the VB's to make things right and boost customer morale. Most people bought these trucks to pull something and breaking down traveling pulling a trailer is no fun, we shouldn't be waiting for a failure to occur on a known issue.

Hopefully you can get your truck back on the road soon.

Completely agree with this, my only rebuttal would be what other truck/brand/model would be better? It seems to me they all suck and are in a race to the bottom. US, EU or Asia builds they all have what I would consider to be an Achilles heel. Doesn’t matter how much they cost. Yes I have been looking, for several years….makes me more convinced it’s a race to the bottom with the consumer paying the price.

 

Quick update. Finally heard back from GMC customer care after its been "escalated" to the parts team.

"We are still experiencing a delay on the part(s) needed to repair your 2024 GMC Sierra 3500HD. We understand this is a significant inconvenience and we continue to work diligently to resolve the delay. If further information is made available, you will be contacted by your dealer or myself. Thank you again for your patience and please contact me to discuss any additional questions or concerns you may have."

Needless to say, not shocked by this one bit.....

 

Quick update. Finally heard back from GMC customer care after its been "escalated" to the parts team.

"We are still experiencing a delay on the part(s) needed to repair your 2024 GMC Sierra 3500HD. We understand this is a significant inconvenience and we continue to work diligently to resolve the delay. If further information is made available, you will be contacted by your dealer or myself. Thank you again for your patience and please contact me to discuss any additional questions or concerns you may have."

Needless to say, not shocked by this one bit.....

Just fluff to make it look good, I would want a timeline. What are they expecting next week or 6 months down the road? Gm needs to get production of these new valve bodies ramped up so guys can get trucks back on the road.

 

I was a big defender of the "Allison" branded transmission since 2020. Now I wonder if all the critics and skepticisms may have been on to something. Seems like we hear much more about these than we ever did the 6-speeds, even before this latest hiccup.

For the record, I had a 6-speed and 2 10-speeds, with no issues on any of them. Maybe it was luck or not enough miles, but they all performed great.

 

Mine was great too until it wasn't. Like i said it being "broken" is not the crux of the issue, stuff happens. GM is just handling this so poorly. I honestly don't understand how they continue to build trucks but cant or wont support the ones already sold, its maddening.

 

Yep and my response was very pointed asking that exact question. I also asked if an entire transmission could be authorized or if they would authorize/reimburse me for an aftermarket part since I could have a valve body from next gen here like tomorrow. I also asked what they are going to do about my expenses while my truck is down due to their defective design. I also informed them that if this is going to stretch beyond 30 days of downtime I intend to exercise my rights under the Florida lemon law. No response yet.....

Good, It will be interesting to see what their response is to you. I have seen guys get a whole transmission replacement when the valvebody took to long, but then again does the new trans have the updated Valvebody?

I was a big defender of the "Allison" branded transmission since 2020. Now I wonder if all the critics and skepticisms may have been on to something. Seems like we hear much more about these than we ever did the 6-speeds, even before this latest hiccup.

For the record, I had a 6-speed and 2 10-speeds, with no issues on any of them. Maybe it was luck or not enough miles, but they all performed great.

When I first bought my 23' and joined this forum I remember guys talking about a guy named Mike L that said these 10l1000 trans would incur valvebody issues. Not sure what the reasoning was behind his observations. What year were your 10spds? It seems like a lot more 23-up guys have the issue then the 20-22 guys lately and milage is all over some under 10k, and most seem like 30-50k range.

Completely agree with this, my only rebuttal would be what other truck/brand/model would be better? It seems to me they all suck and are in a race to the bottom. US, EU or Asia builds they all have what I would consider to be an Achilles heel. Doesn’t matter how much they cost. Yes I have been looking, for several years….makes me more convinced it’s a race to the bottom with the consumer paying the price.

I am not sure on that one yet, as you state they all have issues. It more so boils down to how the company is handling the issue and treating the customer. Gm has had VB failures for 4years that we know of so far, we don't know about the 25's yet. Thats a long time to let an issue linger on and then pretty much owners don't get a resolution until they suffer the failure. If they are prone to failure make it right and replace them, Toyota has an issue with the Tundra motors and instead of waiting for everyone to suffer an engine failure they are moving forward on replacing them all. That is pretty impressive, they could of played the numbers game like GM is doing but chose not to. Since we have HD trucks that vastly limits our choices...another GM, a Ram or a Superduty. For me I think my next truck is going to be the Superduty, but not a 6.7 as those are not as easy to work on like the dmax and have some issues. I would end up going to the 7.3 zilla. The Ram I am just unsure about Stellantis as a company therefore its at the bottom of my list, although I have two friends with Ram hd's...one gas and one diesel and both have been good without issue. When I am at the campgrounds last year I was taking notice at what trucks people had and the Superduty is an overwhelming majority..must be a reason.

 

When I first bought my 23' and joined this forum I remember guys talking about a guy named Mike L that said these 10l1000 trans would incur valvebody issues. Not sure what the reasoning was behind his observations. What year were your 10spds? It seems like a lot more 23-up guys have the issue then the 20-22 guys lately and milage is all over some under 10k, and most seem like 30-50k range.

When I am at the campgrounds last year I was taking notice at what trucks people had and the Superduty is an overwhelming majority..must be a reason.

Both mine were 21's. One was new and one was used a couple years.

Yes, I've noticed many at campgrounds are Ford, moreso recently. There are quite a few RAM trucks, too, but most say they got it due to the price.

 

2023 here with just under 23k. Mine started acting up while pulling out of a parking lot on to the road and lightly accelerating. Shuddering like it didn't know which gear to be in and then a bang, 5th gear I presume, warning on the DIC and 40 mph at 2300 rpm. When I got home, shut the truck off, restarted it, the CEL light was on, but the truck drove normally, shifted just like it should. Made an appointment with the dealer, took a few short trips around town to get some lumber and groceries that afternoon and parked it. Started it to drive it to the dealer a few days later for my scheduled appointment and there was no CEL and it drove normally. Dealer looked at it, said they couldn't find any codes stored, said to take it home and drive it. Next weekend running errands again and it puked on me again. Same scenario. However, after I started the truck (I didn't count, but it was more than 5 times) the CEL lamp went out and the truck drove and shifted normal. Made another appointment with the dealer, dropped it off with no CEL and they drove it around and fortunately it happened during their test drive. They called me up, said you need a valve body, we don't know when we'll get one in for you, you are basically in line behind the other guys who are waiting. I asked them what I should do and they said just drive it like everyone else is, until we can schedule you for a replacement.

My question is will I hurt the transmission by continuing to drive it? I'm not going to take it out of town for a long trip or anything, I can't trust it. I don't want to break anything either. What are the possibilities of other damage if the valve body doesn't do it's job?

I have towed what I would consider "heavy-ish" only twice. Both times were hauling a vehicle on a car trailer. I've just purchased a 5'er for camping, but it is waiting on parts before I can pick it up. Was planning on doing some camping this season, but that is on hold til further notice. Sorry for the novel.... Hopefully this helps someone else who is going to be dealing with this....

 

Not sure if you would damage it or not. Mine when it happened( and it did it twice) I was towing my 24000# trailer and the transmission temp went from its normal 145 when towing up to almost 200 pronto both times. I assume the temp was from slipping so I stopped to let it cool multiple times because I was afraid of it overheating the transmission and damaging it. The CEL light went out on mine too but it had a P0747 stored in the history multiple times. The dealers does not think I should be driving it so its sitting in their lot.....

 

This is beginning to sound more and more like a problem that will happen, sooner or later, on all these transmissions. GM is just praying more will survive past the warranty period to limit the hemorrhaging. If they wanted to repair their image on this, they should halt production on new trucks (if they are equipped with the new and improved valve body) until all the current warranty claims are taken care of. My 2 cents.

 

Of course that's what they are doing, dragging it out so they lessen the financial blow in themselves. The longer you stretch it out the more likely trucks get out of warranty, wrecked, natural disaster total etc. They either don't care about this issue, or it's an inherant design flaw that they cannot or refuse to fix and have decided it's in there best interest to fix it on the backside vs. taking care of the customer from the start. This isn't just a milage thing, there have been many reports of low mileage trucks having the failure.

 

I got a 2020 with 21k miles and ordered the nextgen rebuild kit. I have not had any issues with the transmission yet but all my reading leads me to believe its a ticking time bomb. We have a cross country trip coming up and figure I would not want to break down 2500 miles from home. I talked to nextgen and they said they are slammed with orders for the kit.

 

My 24 2500 did it last week same thing only 45k on it. Now I’m beating on a 25 1500 until they get the part . I do like the free warranty upgrade idea.

 

Did they give you a tiimeline?

Mine will have been there three weeks as of Monday and i still have no timeline on when a part will be available. No word from GM on my other queries either.

 

 

I dropped my 24 2500 duramax with the Allison off 2 weeks ago they told me value body is on back order and don’t have a time line. Mind u I am dealing with the dealer I ordered and bought my truck at and they can’t give me a loner vehicle which I think is ridiculous!!!!

 

That stinks that cant/wont give you a loaner. The dealer where i am stranded gave is a Silverado 1500 to drive which unfortunately lost a radiator today with only like 3500 miles on it. They were able to put us in another truck, this time a GMC 1500 AT4 with a 6.2l.

 

Has anybody heard some general estimates on the labor cost to have the NextGen full VB installed? Additionally, is it fairly straight forward or would it take a dedicated diesel performance shop vs a standard transmission shop?

I don’t know that I’d pull the trigger on this as the VB alone is a lot of coin, but it crosses my mind as I’d hate to have a long trip with my family interrupted by this. Would suck on a high level dealing with the logistics of storing/towing my trailer somewhere and leaving my truck at a dealership in BFE for who knows how long.

This is becoming more and more commonplace or at least we’re hearing about it more frequently. It’s not something you can prevent or see coming.

 

@dursmarook just went through this so he would be the best resource. He tried to do the kit himself not that didn't work out well so he went to the full valve body.


The only issue with all of us spending our coin to fix GM's shortfall is we are essentially bailing them out and taking them off the hook for this, thus why they play this game anyways.

 

I just got the recall in the mail today and it has a paper for submitting if you have had the issue fixed already for repayment. If they will approve it is anyone's guess but I am going to submit after the shop installs it next week. I'll report back on the cost for them to do the work, probably be in the about $400.

I watched the fabrats video on youtube and he made it look very simple but he has a lift and I don't honestly feel like laying on my back pumping in all the fluid and getting it all over my new driveway.

 

I just got the recall in the mail today and it has a paper for submitting if you have had the issue fixed already for repayment. If they will approve it is anyone's guess but I am going to submit after the shop installs it next week.

I watched the fabrats video on youtube and he made it look very simple but he has a lift and I don't honestly feel like laying on my back pumping in all the fluid and getting it all over my new driveway.

I think the fine print says, you must have already installed the fix before the letter. At least that’s what mine said? The fabrats video as well as the instructions from NextGen are not complete to properly install the kit. AFAIK the only ones who would know how to install the kit would be someone with experience in disassembly of the valve body.

 

Seems like the comment by @LRImport is what it feels like happening. I just posted the following in a different forum, but this one has been a great resource for me so wanted to share here too.

3 Weeks After Valve Body Replacement Update:
The code was for a solenoid that was stuck open. That is an internal part so there was nothing that the tech could actually see that might have caused it. The service was a straight swap of the whole valve body.
Part# was the same as the one they took off. I confirmed that the part # would switch if GM started using a different supplier. (So the part they put on at less than 35K miles, will be in the back of my mind until I get long past the 70K mark.)

I have noticed the lower gears seem to not be as smooth as it was before. Seems like it revs higher at times before the gear actually switches. To add some context to that though:

• I'm generally a pretty easy driver. (I'm one of those that likes seeing 30+mpg if I'm not pulling a trailer.) But when pulling out on the highway or something, I do give it more throttle to not be a pain in the a**. When I try to give it that get-on-it, i notice more of the searching.
• I dont hardly feel or hear a thing when going through the higher gears, but going over hills I kinda feel like it should maybe make the next shift up sometimes and it doesn't do it when it kinda seems to me it should be.
• It has been super cold here for the past couple of weeks. (single degree temps)
• There is apparently a "learning time" for the TCM of around 500-1000 miles, where it will learn your driving habits and program accordingly. I am around 250 miles at this point.
• I did not have the Banks iDash during my first few months with the truck and did not "see" when it was in what gear. Now I do have that displayed and perhaps I just notice it more because of that? Maybe I didnt notice it doing this during my first few months of owning the truck because I was distracted by the shiny new toy?

I have found this forum very helpful, so thank you to the folks sharing stuff here. I will try to keep updating periodically. My busy season for my business will hit in about a month and that is where my true test will begin. I'll be on the road with a trailer almost daily for about 10 weeks straight.

 

He's keeping the pressure on this... Newest video...

 

@jb882 I saw this in the comment section of one of those vids. Might be with a shot of it can get you moving again and no money out of your pocket.

 

@jb882 I saw this in the comment section of one of those vids. Might be with a shot of it can get you moving again and no money out of your pocket.

View attachment 1144863

I'm pretty sure GM is not paying for that kit, the dealers are to do right by their customers. I can't ask the dealer where i am at to do that, i did not buy my vehicle from them so i don't feel like they should pony up any money like that for me, i'm not their customer, just a guy that brought them a broken truck. They have already been super accommodating with now 2 loaner vehicles since my first one had a radiator leak and when that happened one of the guys from service came in on a Sunday to get me another vehicle.

That said i did ask GM this exact question and was told that was not an option from them, they would not even agree to reimburse me for the part if i bought it.