Jump to content

2023 Allison transmission valve assembly

Lars Ohrstrom
 Share

Recommended Posts

DBD1979 New Member

DBD1979

Posted
Posted

I am having the same issue now with my truck, shifting issue and going into power reduced mode. First time it happened I cleared it by disconnecting the batteries for some time. Second time I took it to the dealership, they flashed the computer and said they couldn't replicate the issue and to bring back if it happens again. Well last night it happened again, had the truck back for less than a week. Have not even used a full tank of fuel. I am dropping it back off today, I will update with outcome. Glad I seen this thread to see its an actual concern, I'm sorry for all those that are dealing with this. I paid 90K for a crap box, currently have 36.5K on the clock.

  • Replies 40
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Posted Images

Major Tom Enthusiast

Major Tom

Posted
Posted

Text below is from NHTSA Check for Recalls web page:

 

 

"Oct 24,2024
Manufacturer Recall Number N242454440
NHTSA Recall Number 24V797
Recall Status Recall Incomplete, remedy not yet available

Summary General Motors has decided that a defect which relates to motor vehicle safety may exist in certain: 2020 – 2022 Chevrolet Silverado1500/2500/3500 and GMC Sierra 1500/2500/3500 and 2021 model year Cadillac Escalade and Escalade ESV, Chevrolet Suburban and Tahoe, and GMC Yukon and Yukon XL vehicles equipped with diesel engines. A transmission control valve in some of these vehicles may be susceptible to excess wear over time, resulting in a gradual loss of pressure within the valve that can cause harsh shifting. In rare cases, the rear wheels may experience a momentary lock up. If the rear wheels lock-up momentarily while driving, there is increased risk of a crash."

 

Yes, my truck is on the list.  Had some bad sensors replace on the truck last week and the dealer said they (GMC) did not currently have a fix!

hksegers New Member

hksegers

Posted
Posted

Same here, 2023 Silverado 2500 10 spd Allison 63k miles. Truck clunked real hard and now I’m waiting on a Valve Body replacement. Truck broke down in Minnesota and I live in Missouri and used it for my work truck. Never had a Silverado Duramax and was enjoying it for a solid 4 weeks till this happened. Haven’t even made the first payment and already stranded. 

Rick_ Enthusiast

Rick_

Posted
Posted

Has anybody installed a Nextgen VB kit or VB and remedied the issue? 

Since the kit is only $800 and is available, it seems it would be a viable alternative to letting trucks sit at dealerships for weeks or months hoping that they have engineered a a permanent fix.

My 3500HD trans is working fine at 30k miles but my 2022 1500 Baby Dmax 10spd might get a little preventative maintenance...

LocoS1 Enthusiast

LocoS1

Posted
Posted
On 12/18/2024 at 10:58 AM, Rick_ said:

Has anybody installed a Nextgen VB kit or VB and remedied the issue? 

Since the kit is only $800 and is available, it seems it would be a viable alternative to letting trucks sit at dealerships for weeks or months hoping that they have engineered a a permanent fix.

My 3500HD trans is working fine at 30k miles but my 2022 1500 Baby Dmax 10spd might get a little preventative maintenance...

I've had many buddies who have had to go nextgen and solved the issues prior to the fab rats video being released. If you have seen it. 

 

nparker76 Enthusiast

nparker76

Posted
Posted

I had this same issue back in May. 2023 2500 with 21k miles. I was on a 31-day camping trip pulling a 5th wheel camper. I was only on day 4 of the trip and 1000 miles from home and the CEL and reduced power message came on. Dealership diagnosis was it needed a new valve body. Parts on nationwide backorder and any dealership that did have the part wouldn’t let it go because they had trucks lined up waiting on the same thing. I was forced to trade in the truck, or cancel our big vacation and figure out how to get my camper and fam back home. GM was no help. Like another post mentioned, they were still rolling out new trucks which means parts are available on the assembly line. But GM seems to prioritize new sales over keeping existing sales road worthy. I lost $27k in the deal in order to get back to a similar monthly payment due to a crappy trade in value and no discounts. GM gave me $500 in GM reward points and like $250 worth of on-star package extensions “for my inconvenience”. They could have offered new trucks which means rebates, loaner vehicle, or found the parts. It was a disappointment. I wrote a complaint letter the GM as well, but never received a response. I will likely swap away from GM on my next truck because of this crap, which generally happens every 2-3 years. My new 24 model gets worse mileage. I mean it’s a big diesel so I’m not expecting high mpg, but geez it gets lower and lower with every new design. That’s completely backwards on how it should be. I’m getting 13.5 mpg in my ‘24 where I was getting around 16 mpg in my ‘23…same route to work. And was getting even better in my 2018. Regens every 150-170 miles. It’s crap. Do better GM. 

  • 1 month later...
GLong New Member

GLong

Posted
Posted

Having the EXACT same issue with my 2023 AT4 3.0. with 30,000 miles.

The "transmission" specialist relayed it was #1 & #4 solenoids sticking..."common problem". The Service Manager relayed there were none available in the US, factory backordered. Apologetic added, I have no idea when we will get them could be 2 weeks, 2 months or 10 months. 

Is there a class action suit on lemon law protection? My fear is, they fix these then 2 more fault in 6mos and so on. 

I went with the diesel for long term use with limited issues. 

vucelick Enthusiast

vucelick

Posted
Posted (edited)

The half-tons use a completely different 10 speed transmission than the HD trucks.  So looks like it covers both transmissions

Edited by vucelick
  • 1 month later...
Okanagan Jerry New Member

Okanagan Jerry

Posted
Posted

I have got the exact same issue @30 on my 3500

 

Dealer had diagnosed problem, ordered part but has idea when it will arrive? 


if this is a none issue a) Has Allison / GMC come up with a permanent fix ? b) I need my truck I have been given a small GMC suv loaner but it won’t pull my trailer.

 

Sounds to me like a faulty casting or ?

 

 

Elite130 Enthusiast

Elite130

Posted
Posted

I just had the valve body take a $hit on my 2022 Silverado 2500. I just turned over 40k miles. No warning at all. I was pulling out of a shopping center parking lot onto a main road and as I was accelerating, the truck hesitated and jerked about 4 times. Then the truck lost all power and then got a check engine light and reduced engine power warning on the DIC. I pulled over at the next shopping center. Put the truck in park. Ran codes on my iDash and got a P0700 "lost communication with transmission BCM" code. I didn't reset the codes. Turned the truck off for about 15 min and restarted it. Put it in gear and started driving again. The transmission was stuck in 5th gear. I could drive the truck normally (still in reduced power mode). My house was 3 miles away, so I limped it home so I could get all my work gear out of it knowing I would be without my pickup for weeks. An hour goes by, I get back in and proceed to drive it to the dealership. Truck is shifting normally, but still in reduced power mode.

 

Diagnosis - Bad valve body, transmission fluid appeared to be burned with signs of metal flakes. New VB is on order and full rebuild may be necessary. All work covered under warranty. 

 

The item I do not understand is the burnt transmission fluid. I watch my tranny temps when I haul all the time. Never have I gotten the tranny temp hot nor did I ever receive warnings. Thoughts?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,759
    Total Members
    8,960
    Most Online
    DM22
    Newest Member
    DM22
    Joined

  • Who's Online   2 Members, 0 Anonymous, 2,507 Guests (See full list)

  • Latest Articles

  • Posts

    • B14Sierra
      Cam chain tensioner question

      By B14Sierra · Posted

      So I'm in the middle of a DOD AFM delete on my 6.2 L86 Sierra. I had a pick holding the tensioner but after I got the Cam phaser gear off I was cleaning off all the rtv and apparently I didn't have the pick seated far enough in. I bumped it and the tensioner sprang forward.  I think everything is good but I want a second opinion. The top of the tensioner is just a looped piece of plastic that rides in that channel right? There is no spring or anything is there? I got the gear and chain back on and it seems tight and everything looks right. I'm hoping nothing fell out.
    • dna9656
      No low range 4 x 4

      By dna9656 · Posted

      My 2015 1500 LTZ Silverado suddenly won't go into 4 x 4 low. It will go into 4 x 4 high.
    • asilverblazer
      Transmission Woes :-(

      By asilverblazer · Posted

      Yep, just a quick reference point.    My main point being I’d do a thousand other things before I’d pay 10k for a transmission.    Speaking in ignorance cause I don’t look at these trucks, what is it worth? 20k?
    • asilverblazer
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By asilverblazer · Posted

      I think users are going to want to pick their monitored parameters, which parameters they want to see first.    It should probably start with baseline at a minimum and adjust to learned, but be able to overlay baseline for comparison.   A simple severity level would be able to determine what type of alerting is appropriate or user selectable.    Why not use the OBD port though?   I think a phone connection would be a good idea, push notifications type deal.   Number 1 issue is having data is useless if you don’t know what the data should be under normal conditions. 
    • Chuck FB
      summer road trips in the 2026 2500HD

      By Chuck FB · Posted

      I thought I would use your thread and add to it as I just did my first longer drive with my truck in the last couple of days. I drove from the Grande Prairie area of Alberta down to Edmonton and most of where I drove in the city was the ring road so fairly free flowing but a bit of stop and go as well in the city. Stayed the night and returned home and not too many stops along the way each way but every restart and certainly every cold start sets it back for fuel mileage. Why I say that is I see some people will cherry pick a fuel mileage leg after the vehicle had been warmed up driveline wise before hand and its a forgiving ( easy rolling drive leg for example ) and call that their fuel mileage which can give a false perception of reality. I was not heavily loaded at all but never the less the flip bak cover, rubber bed mat, various tools etc and extra jerry cans of fuel all way up to a few hundred pounds of dead weight so its not an empty truck. The cold inflation tire pressures are set more near the freezing point so once they are warmed up driving I was showing 45 front and over 40 rear and realize high inflation pressures would help a little in fuel mileage but certainly not the ride on our crap sections of highway. The weather was good so was not raining as that can really drag mileage down, in fact I had a bit of a tail wind on average driving home. Most people on here would never have driven on that freeway to visualize it but its got a fair bit of rolling type of landscape with numerous river valleys. For the most part I had it on cruise set to 62 although kicking it off if I caught it in time before it started down shifting and self braking going down the grades. Most of the more substantial grades its shifting into 7th I believe as 8th just doesn't have it. Total distance round trip was 643 miles and my overall average and I did refuel three times in all, figured out to 17.65 miles per US gallon. My best fuel mileage section refuel within all of this figured out to 18.46 and these are all hand calculated figures. I find if anything that the trucks computer can be over optimistic, sometimes its pretty close but other times its stretching it. On paper persay in theory the truck would have just about made it on fumes for that whole drive without refueling once.    Which made me think of the topic thread of the wonder if these trucks could do 20 mpg and that is a good question, certainly would have to be on an easy going flat highway, no head wind, the right temperature, not packing around a bunch of dead weight and puttering along even slower than I was I would suspect and going steady and not stopping to smell the flowers or take a piss !. It probably is possible but not without effort to attain that with the wind resistance and weight of these trucks. Of course on my drive most people are passing me if they have the power as per loaded highway tractors, never mind a lot of speedy vehicles but the speed limit is 68 and most are at or well over that. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...