10 Speed Valve Body Issues

[Diabel1969]

Fords also have the same issue, I know of two people with F-150's who are part of a Class Action Lawsuit over it. Honestly I had no idea both Ford and GM used the same Valve Body until after I purchased my truck. I was specifically avoiding Fords for that, so hopefully mine holds together long enough to upgrade it.

They both shared technology on this transmission after the 8 speed disaster..

 

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[Purple MF]

3.0 Diesel has been in the dealer 1 week now with the bad valve. Have a rental .. a Ford Bronco sport lol . Me and my 5 year old daughter drive it to preschool and pretend its a Mariokart. GM told me they will reimburse for a rental if I rent a GM . I said there were none available , they must all be getting repaired.

 

[grover]

How many miles did it have on it when it did it??

 

[EVADtech]

How many miles did it have on it when it did it??

32,000 it’s under warranty but they only want to replace the valve body. Clutches have to be abused after the lock up and wear from the valve body going bad.

 

[Craneman1]

I have a 2023 Yukon 3.0 and recently experienced a rear wheel lock-up. A week later, the vehicle went into limp mode. Initially, I thought the collision detection system malfunctioned and applied the brakes while driving on the highway. However, after extensive research, I discovered it was a transmission issue that thousands of others are facing. This is a significant safety concern, and I am shocked that GM has not addressed it.

My Yukon has been in the shop for five weeks now with no resolution in sight. The dealership claims they do not have the valve body needed for the repair. I have insisted that I do not want the vehicle back unless they install a new transmission and an upgrade kit from NextGen Transmission with their valve body upgrade. I suspect that the rear wheel lock-up at 75 mph damaged both the transmission and the valve body. I am currently waiting for GM to make a decision. It is disheartening that they allow these vehicles on the road despite knowing about this major malfunction that can cause serious harm. Their supposed fix is a software update in older models to detect when the valve body is failing and switch to limp mode before a lock-up occurs. Clearly, this is not working.

Additionally, I recently purchased a 2025 GMC 3500 AT4, which has the same valve body design. I know that models from 2021-2024 have been experiencing similar issues. Does anyone know if the 2025 model has the same problem? I am considering installing the upgrade kit preemptively to avoid any issues. Towing a 5th wheel toy hauler with this concern is terrifying, as the problem can occur without warning and is very frightening.

What are everyone's thoughts on this issue? I have been researching extensively online, and it seems very apparent, but there is not much information on the 2025 models yet.

 

[Craneman1]

This is long but contains a lot of great info.

If I had recently purchased a 3500 AT4 and I liked the truck and plan to keep it long term I would call Dimitri at No Zone Transmission 801- 637-4593 and have them fix the problem before it happens. No Zone installs the Nextgen Kit in your valve body and ships it back to you with a PPE deep pan. The deep pan holds 2.5 extra quarts.

Also add the PPE thermal bypass valve (assuming they sell one for the 3500) and drop the trans temps 60 degrees.

 

[mandalorian]

I have a relative in Florida that has a 21 GMC half ton with that diesel engine, and his transmission shifts pretty erratically. Makes me wonder if it's more a diesel trait?

definitely not diesel specific...its all to do with the 10L80 transmission valve bodies having weak internals. @2SHOES is correct about the fords which also have the same tranny.

https://nextgendiesel.com has some some videos on the UTube which go over all the issues in depth along with aftermarket kits to bulletproof your trans.

 

[DoubleDeuce]

Unfortunately, my 23 GMC 3.0L is in the shop due to a valve body problem. It has 21K miles, and the dealership isn't sure how long the backordered part will take. Best guess is two weeks to two months. Yikes!!

 

[RebelDS]

I’ve got a 2024 with 3.0 and my transmission is fine right now. But wondered about these valve body kits. Does installing one void the warranty? I guess if I put a kit in, I might be better off than a having a dependable valve body without a warranty than having a bad valve body that has a warranty

 

[gemarsh]

I’ve got a 2024 with 3.0 and my transmission is fine right now. But wondered about these valve body kits. Does installing one void the warranty? I guess if I put a kit in, I might be better off than a having a dependable valve body without a warranty than having a bad valve body that has a warranty

Honestly the dealer won't know if the kit has been installed. They will just remove and install new/reman.

I'd bet GM won't be inspecting these valve body's for why they are failing. Unless gm is going to reman these, nobody will be the wiser.