Jump to content

Valve Body Replacement - 2023 Silverado Custom Trail Boss

Michael Lung
 Share

Recommended Posts

66ss3964spd Enthusiast

66ss3964spd

Posted
Posted

I haven't read of anyone here that knows what is failing in the VB, but I have to guess GM engineering has done the forensics and knows what fails. If they do know they aren't making it public knowledge, natch. We do know the original VB P/N has been superseded by at least one new P/N.

 

The 10 speed VB has a bunch of solenoids, and associated rods/plungers and springs. Probably a check ball or two. If any of them don't or can't go where the TCM tells them to, for whatever reason, failure.

  • Replies 362
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Michael Lung
Michael Lung

Man, this thread really took off. Sorry to hear about everyone having similar issues as I did. I’m about 5000 miles into my new transmission and it’s still running fine *knocks on wood*. Keep pressuri

stan hopkins
stan hopkins

Quick update - Got GM customer care involved yesterday and advised them when this hits 30 days on 11-30 I will be looking to make a lemon law claim. They called me back today and advised me the valve

Michael Lung
Michael Lung

As the OG on this thread, first I’d like to start by saying I’m sorry for the people STILL getting dinged with this valve body issue. As far as for me, about 20K miles since the replacement and things

Posted Images

Michael Lung Enthusiast

Michael Lung

Posted
  • Author
Posted

As the OG on this thread, first I’d like to start by saying I’m sorry for the people STILL getting dinged with this valve body issue. As far as for me, about 20K miles since the replacement and things are running as they should *knocks on wood*. I’m hoping things will last, but it’s just hard to tell with GM these days. 

  • Like 1
  • Thanks 1
JustSomeDude Enthusiast

JustSomeDude

Posted
Posted
16 hours ago, Michael Lung said:

As the OG on this thread, first I’d like to start by saying I’m sorry for the people STILL getting dinged with this valve body issue. As far as for me, about 20K miles since the replacement and things are running as they should *knocks on wood*. I’m hoping things will last, but it’s just hard to tell with GM these days. 

Thank you for posting the update.  I'm nervous about it.  I have not had much driving on the redone one yet.  I have only driven a little bit and I can't tell if Im being paranoid or if it is searching a little bit to get from 1st to 3rd.  I have some driving to do after work and will be trying to keep radio off and pay attention for any sounds and see how it feels under some different conditions.  Will not be towing anything today, but in a couple of days I will be pulling my trailer around for a little while.  

But to your point, it does stink that people are still getting hit with this issue. I'm still trying to get some word from GM rep as to what (if anything) they are going to do to help with the peace of mind.  

Telum Pisces Enthusiast

Telum Pisces

Posted
Posted
On 2/8/2025 at 3:23 PM, Telum Pisces said:

Does anyone know what is actually failing in these valve bodies?   They are pretty simple parts with channels and valves to direct all the fluid! The Ford version seems to have a different valve body in it and I can't seem to find the same or similar problems on the Ford version of this transmission!

 

Update!

Got my truck back today.  I will say that contacting GM directly and voicing your displeasure at the back ordered valve body with no ETA given from the dealer seamed to help my case!  The dealer was very surprised when a valve body showed up for my truck on Friday afternoon of last week.  Total time from problem to fixed was 1.5 weeks!  

Here's to hoping I don't have a repeat problem.  

Dealer had hopes that GM would eventually do a recall on these transmissions to actually fix them before people get stranded!

66ss3964spd Enthusiast

66ss3964spd

Posted
Posted

Glad you got yours back so quickly.

 

The "trigger" for my repair seemed to be when I opened a case with the BBB. I got a call from a different customer service organization within GM the very next day after I opened the BBB case. Evidently those BBB cases get routed differently and, it appears, GM jumps on them. Mine got fixed about a week later.

JustSomeDude Enthusiast

JustSomeDude

Posted
Posted
1 hour ago, Telum Pisces said:

Update!

Got my truck back today.  I will say that contacting GM directly and voicing your displeasure at the back ordered valve body with no ETA given from the dealer seamed to help my case!  The dealer was very surprised when a valve body showed up for my truck on Friday afternoon of last week.  Total time from problem to fixed was 1.5 weeks!  

Here's to hoping I don't have a repeat problem.  

Dealer had hopes that GM would eventually do a recall on these transmissions to actually fix them before people get stranded!

Good deal.  Squeaky wheel and grease and all that, but I seriously was trying to make sure that they knew there are more people with this issue than is reasonable for a reputable company to have. 

I did get to a GM rep today but didn't really love the needle for my comfort level/confidence that the truck is actually fixed. Referred me to local dealers technician who could be able to find more info about the VB that was put on. My ticket had the same part # listed as the one that went bad.  Still don't know if I'm dealing with a legit fixed one or got one that was still from the old batch. Will have to try to call the dealer tomorrow 

  • Sad 1
Telum Pisces Enthusiast

Telum Pisces

Posted
Posted
13 hours ago, JustSomeDude said:

Good deal.  Squeaky wheel and grease and all that, but I seriously was trying to make sure that they knew there are more people with this issue than is reasonable for a reputable company to have. 

I did get to a GM rep today but didn't really love the needle for my comfort level/confidence that the truck is actually fixed. Referred me to local dealers technician who could be able to find more info about the VB that was put on. My ticket had the same part # listed as the one that went bad.  Still don't know if I'm dealing with a legit fixed one or got one that was still from the old batch. Will have to try to call the dealer tomorrow 

My part number was different than the one in it.  I made sure of at least that.  But I don't know if that means anything!  It's going to take time for me to trust it.  Mine gave me no warning!  I didn't have hard shifts or anything!   I pulled out of a gas station and it just went out.   I had made it to 3rd or 4th gear and all of a sudden, no more gears at all.  Then it would only get to second and reverse was gone!  

Going to take a lot of time to pass for me to fully trust it.

 

66ss3964spd Enthusiast

66ss3964spd

Posted
Posted

Your symptoms sound exactly the same as mind did; no warning, pulled out of a gas station, drove maybe a couple hundred feet, then got a bunch of DIC warnings, wouldn't up shift past maybe 4th. Still had reverse though, I think.

 

While mine now seems fine complete trust is still 1000's of miles away.

TBG New Member

TBG

Posted
Posted

I have a 2022 Chevy Trailboss bought in Oct 2022. I've got just under 30K on the 3.0L engine. On 1/31/25 I was getting on the highway and the transmission shifted very sluggish and got a check engine light. Got it to the dealer and found out today it's the transmission valve body. Part is suppose to be in dealers hands next week. We'll see.

Bobby Nicholl New Member

Bobby Nicholl

Posted
Posted

Hey, First time poster, 2nd time valve body cracker. First time my 2021 Trail Boss 6.2L had 60k on it. Now a couple weeks ago, it went again with 90k on it. Part has no ETA. Got a fully loaded 2024 AT4 for a loaner, so i am not worried about when i get it back. BUT, i only have 10k left to go before my warranty runs out. It will happen a 3rd time, due to the part construction material has not changed. Does a guy, trade it in and buy a new GM or should a guy cut their losses and switch brands? I see 2024's are having the same issue. Anyone know if the construction material changed for the 2025's or a redesign of some sort?

 

Thanks  

SilveradoRST Enthusiast

SilveradoRST

Posted
Posted
2 hours ago, Bobby Nicholl said:

Hey, First time poster, 2nd time valve body cracker. First time my 2021 Trail Boss 6.2L had 60k on it. Now a couple weeks ago, it went again with 90k on it. Part has no ETA. Got a fully loaded 2024 AT4 for a loaner, so i am not worried about when i get it back. BUT, i only have 10k left to go before my warranty runs out. It will happen a 3rd time, due to the part construction material has not changed. Does a guy, trade it in and buy a new GM or should a guy cut their losses and switch brands? I see 2024's are having the same issue. Anyone know if the construction material changed for the 2025's or a redesign of some sort?

 

Thanks  


I’d like to know is it poor material quality or design spec?  

Bobby Nicholl New Member

Bobby Nicholl

Posted
Posted

What I was told by a "service advisor" my first go around, was that it used to be made from a stronger material and now the new material keeps cracking or breaking. What that material is or if this is indeed the case I don't know. Metal to plastic maybe. No idea, but the first time this happened she was hoping GM would come up with a fix and issue a recall, but I see that has yet to happen. 

Tom73 Enthusiast

Tom73

Posted
Posted
On 2/9/2025 at 6:40 AM, Dan H 2023 HC said:

I haven't read of anyone here that knows what is failing in the VB, but I have to guess GM engineering has done the forensics and knows what fails. If they do know they aren't making it public knowledge, natch. We do know the original VB P/N has been superseded by at least one new P/N.

 

The 10 speed VB has a bunch of solenoids, and associated rods/plungers and springs. Probably a check ball or two. If any of them don't or can't go where the TCM tells them to, for whatever reason, failure.

I was told that it was the reverse solenoid in the valve body that went out. Said they do not replace solenoids in the valve body. They could not get a valve body so ended up with a new transmission. 

66ss3964spd Enthusiast

66ss3964spd

Posted
Posted

Doesn't appear that anyone outside of GM knows what the failure point in the valve body is, and there might be multiple failure points. Many people in this thread reported losing reverse but mine didn't.

 

Interesting that GM couldn't find a VB for yours, but could find an entire transmission. How long was your truck out of service?

Bobby Nicholl New Member

Bobby Nicholl

Posted
Posted

I lost reverse both times. First time I got a tow. The second time I drove it to the dealership in limp mode hoping to crater the thing. Been there almost 2 weeks. No word or eta on part yet. 

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

  • Latest Articles

  • Posts

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      tl; dr I've now reached the 6th floor of hell. I'm chronicling my journey for my morning readers.   Pulling the top of the intake apart was moderately easy but it involved a lot of parts, connections, and minutae. I was preparing for the new fuel lines to arrive ("nut and bolt kit" it's called). The fuel line connections are notched and held in place by the manifold and a metal plate with a T27 screw.   It's on the back of the intake, under the firewall, with little clearance, and two hard metal fuel lines in the way. I was using Franken-tools (weird combinations of 1/4 inch ratchet with/without an extension, with a bit holder for my T27) to get in there. One of my sockets and bits fell off and has yet to emerge on the floor. I lost a second setup and that's when I almost started throwing tools. But that was the point at which I had gotten traction on the Torx head, and it promptly stripped. No more traction.   I started humming "1-877-kars-4-kids" because I was about at that point. You know what? I'm $1500 into this thing and I can make it disappear just as quickly. This isn't fun anymore. I had spent a lot of time already "tidying" around the engine bay: Fixing all the "someone's been here before!" BS. The truck has been exclusively dealer- and shop- serviced and I'm reminded of why I never let other people work on my cars unless absolutely necessary.   Speaking of dealer service. This truck has a 1" stack of records going back to 1995. I put them all in an excel spreadsheet, date/mileage/description.   The CPI spider has been replaced 4 times in 85k miles. The EGR? Another 4. Multiple, multiple O2 sensors. One Cat. 4? Sets of plugs and wires, and I swear half the stack is diagnosis paperwork for "misfire, runs rough, extended crank, dies at stoplights".   GM was producing some proper crap back then. And it was still well within the era of brittle/crappy plastic. (Windows 95 was released the same month this truck was sold new, we HAD the technology!!)   There (was) a plastic shroud around the evaporator core and HVAC fan in the engine bay. I noticed a chunk of it missing so I poked at it some more and it literally shattered. Touched it some more and pieces were crumbling off. Had a good laugh. Clearly whatever plastic garbage they were using had broken down over 30 years and was literally turning to dust. That was a good half hour of using a shop vac to remove the rest of it.   Back to it.   I was going to give up for the evening but then decided I'm already level 10 pissed off at the stripped screw: G* D* it, give me my tools back -- and my JOY. We'll do this the hard way: The whole intake is coming off.   Blazer won Round II. After finally finding and accessing the 12 intake bolts and using a pry bar to unseat it from the heads, it popped loose in an explosion of gunk and grime raining down into open ports. Awesome.   6 times I reminded myself: Be careful of the temperature sender on the front of the intake.   YEAH, I forgot again and snapped it clean off in the removal. Add another $20 to the ever-growing list of new parts this thing is consuming.   The shame is, long before removing the intake, I had changed the oil in prep for Tuesday's momentous fuel line replacement that was going to be the magic fix and I'd have a running Blazer to tool around in this next weekend. The intake removal, including raining gunk, also gushed dirty coolant all over the valley. Of course it did. Welp, there goes another $35.   I now need an intake gasket set, bolt set, coolant temp sensor, another 5 quarts of oil, some RTV. Don't worry, I've already got 3 new jugs of Dexcool and a thermostat waiting. I'll fill it with clean water first to get it running, dump it, and then add the Dex later on in case... well, let's not go there. I'm only tearing this down once, next time the truck is going on Marketplace for FREE.   Oh, and I'm going to need vacuum hose for all the stupid connections placed at the rear of the engine which have since disintegrated. Come on, GM....tell me you don't do that anymore?   Oh, and the ears on the distributor where the cap screws down are both cracked. I mean, why not put a new distributor in it too. You get a distributor, YOU get a distributor, Everyone gets a new distributor!   This truck isn't out of the woods yet...I'm already questioning how much more time I'm willing to sink in.
    • William Aldrich
      Bent valve in 2025 GMC Canyon Denali - Requires engine swap at 14K miles

      By William Aldrich · Posted

      NewDude, thank you for the suggestions!    I did follow up and the dealer indicates he has an open CX case and is working with DPAC (Dealer Parts Assistance Center).   Per the dealer, GM has had a quality spill and is not providing an update for when a replacement engine will be available.
    • Silver Yeti
      Poll: Does your truck have the rear window leak?

      By Silver Yeti · Posted

      That's interesting.   There was a factory wire-hole in the back, top of the rear cab, which had a wire for the third brakelight assembly running through it, as well as several holes (10 of them I believe) for all of the studs coming off of the 3rd brakelight assembly itself.   I sealed all of those holes with RTV/silicone as well.   I found it kind of odd, that none of those holes, were sealed with any kind of sealant by the factory - if there was any there, it wasn't very much.   That said, I've been out in heavy rain and have ran the truck through high-pressure car-washes a few times now and she has been 100% water-tight to this point.   I feel very confident in the repair, we'll see how it holds up.
    • Jay-22-2500
      2024 Silverado 2500 HD with the 6.6 Gas (L8T) Engine

      By Jay-22-2500 · Posted

      I bought a used 2022 2500hd with 6.6L in February. In March took a 2200 mile trip towing our 6500 lb trailer. Changed the oil day before leaving and when we were arriving at our 1st destination, low oil light came on (roughly 1000 miles) it was 2 qts low. Now it towed like a dream, no issue there, and we did go through the mountains of TN, but still, 2 qts! Luckily I did purchase an extended warranty. Brought it to the dealership in April, oil change and consumption test. Brought it back last week, 1300 miles, no towing, and no oil showing on the dipstick. GM is reccomending a new engine (cheaper than them rebuilding), we'll see if the warranty company comes through. 
    • Donstar
      Navigating senior years.

      By Donstar · Posted

      T3's and Ibuprofen. I do have a cryotherapy unit (ice machine) and a lift chair that will allow me to raise my legs above my heart.  There are topicals that I can use once the wound is fully healed.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...