Transmission valve body-no parts to be found

jfoj · Thursday at 9:02 AM

Something tells me that GM is working on some form of updates or modification to the orignal valve body design there may be a new valve body part numbers? This is probably why there are delays in getting parts in the distrubution system.

Installing an exact duplicate of what is in these vehicles may fix the problem for the short term, but the exact same failure will likely happen sometime in the future.

For the money, if I was spending it, I would consider the NextGen upgrade kit. The NextGen update kit is slighty more than a reman valve body from GM. With my experience with automatic transmissions over the years, many of the OE problems have been cured by the aftermarket using more robust parts and materials.

I think part of the problem with the OE system may be the pressures the transmission is operating at are rather high and causing valve body seperator plate leakage and paper gasket blow out along with valve and bore wear. With the different metals and different expansion rates I can see how the paper gaskets on the steel seperator plate will deteriorate with temperature changes over time.

Just my $0.02.

blanchard7684 · Thursday at 9:28 AM

At some point GM removed the latch valves in the valve body and went to using only the input valves to control line pressures and clutch activation.

Staceyr72 · Thursday at 9:40 AM

You guys are awesome!
I should have been on here awhile ago.
Thank you so much

jfoj · Thursday at 9:53 AM

@Staceyr72

Only the Diesel trucks/SUV's were officially recalled for the TCM software update initially. I feel that the reason the Diesel was recalled is these trucks tend to haul heavier loads and are used for towing on a regular basis. Also many of the commercial use trucks probably have higher mileage than personal vehicles. This probably caused the transmission temps to operate higher and caused more thermal cycling, so the rear wheel lock up and harsh shifts showed up earlier.

Mark my work, the gasoline trucks and SUV's with these 10 speed transmissions will be recalled as well for the TCM update. They clearly have an Extended Warranty Bulletin at this point. With the 90,000 Cadillac and Camero's being Recalled for the same problem, this is a BIG problem.

Suggest you fill out a NHTSA complaint form for your problem. Maybe you did not have the rear wheels lock up, but maybe harsh shifting?? This will hopefully help others and force this issue to be looked into in a more serious manner.

Based on what I am finding, I will likely proactively update my valve body in my 2024 with the NextGen kit before 25,000 miles in my truck. Even if if the vehicle is under warranty and I could wait for a failure, for me $1000 spent is worth it to me because when I start my Yukon, my typical drive is 2 1/2 - 6 hours or more. So I do not need to have problems, if I am stranded during a trip, it will cost me more than $1000 for delays, hotel etc.

I added some more links and videos in my earlier post you should check out.

I hope you can talk your dealer into getting a NextGen valve body kit, if they go this route, you should be back on the road next week!

wbsi · 2025-03-31T11:42:08-0400

I have a 2023 Yukon xl with the Duramax diesel and just had the valve body replaced a month ago at around 34500 miles. Took a few days to get the part.

Davefan · 2025-03-31T12:17:52-0400

Staceyr72 said:
I'm so curious to how many 2021 Tahoes are having this issue?
I have a high country, 2021, my dealership has had it for over 2 months, can't get the part to fix it - valve body-
They have another one there, that's been there for 5 months, can't get the part.
So, 2 Tahoes at same dealership, same problem, and can't get the part to fix.
I have escalated to chevy, have a case number, chevy themselves can't get the part to fix my truck. But I still have to pay for it-big payment for something, I can't drive, isn't worth anything for trade and useless- I am furious. I have been a lifetime chevy owner-and this is changing my mind.

Last nights communication with chevy escalation please read:
Dear STACEY,

We have the following update for your 2021 Chevrolet Tahoe, case number 9-14734770575.

We are still experiencing a delay on the part(s) needed to repair your 2021 Chevrolet Tahoe. 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.

I can be reached at the number listed below or emailed at [email protected] (please reply with history to this email for fastest response).

AND MY RESPONSE:

Thank you for the update.
However Janet, if you can not find the part. I want my truck fixed asap. If that means a new transmission then that means a new transmission. This is a Chevy problem and Chevy knows it. Otherwise, payoff my truck. Give me full value so I can trade it I owe $54k.
Not to be a complete rude person. But if my truck doesn’t get fixed fast. I’m going to start escalating this to who ever will listen
I know this isn’t your fault. But it’s not mine either. And I have a $1300 a month payment for something I can’t drive. And Chevy can’t fix!

2024 Yukon Denali with 6k miles. Valve body needs to be replaced and they have had it a month already with no parts in sight. Few more weeks and I will be forced to take legal action. They knew this car had the problem and didn’t disclose it. Furious!!

rswaug · 2025-03-31T12:20:30-0400

Ask your dealership's service manager about getting your payments reimbursed. GM has a dealer empowerment tool that the service manager would have access to. Assuming that you're still in the GM powertrain warranty, they'll reimburse your payments while the vehicle is down, especially in a situation like this where it's an extended timeframe. Generally, GM's guideline is up to $1000 per month but it's certainly better than nothing. The dealership will need to submit a copy of your purchase agreement and finance contract to GM. The dealership will cut you the check and submit a warranty claim to get their reimbursement from GM.

Blanch44 · 2025-03-31T12:47:47-0400

I had the Same problem, "22 Tahie with 41,000 miles Bad Valve Body was without a Vehicle for 3 weeks contacted Chevy/GM and 2 days later the dealer had a '25 chevy Silverado. Dealer had my Tahoe for 2 Months before getting Valve Body Replacement. I was getting the same message from chevy couple times a week until fixed they gave me 20,000 chevy points ! Thats like $200 ! Big Deal 2 months paying for something I couldn't drive . Keep bugging Chevy /gm . My brakes are now pulsating because of sitting for 2 months I'm working on them covering the cost of new brakes .

Blackcar · 2025-03-31T12:48:29-0400

I would think that if someone didn't have vehicle payments on their new vehicle would also be owed a monthly payment for not having use of their vehicle also.

89Suburban · 2025-03-31T12:54:58-0400

@NickTransmissions any input on this?

Transmission valve body-no parts to be found

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