Trouble Shifting (shuddering/drops power) around 45mph on light acceleration

uh33nowit · March 6

I have seen some other posts but not sure if there has been a resolution on this topic. I have a 2024 Chevy silverado 2500HD duramax. At about 12k miles my truck started having a hard time shifting at around 45 mph during light acceleration. It loses power and shudders while trying to shift into the next gear (typically a violent jerk). Sometimes it does it 3 times in a row before actually shifting. I took it to the original dealer the first time and they said it was a software update but when I got it back, it still occurred. I took it a month later to a closer GMC dealership and they said they couldn't recreate the situation but ironically, it did it as soon as I left the dealership. I took it back to the original dealership a month after that and they said it had low transmission fluid from the factory and they filled it up and it was good. That helped for a few days but after that it started doing it again. It doesn't always do it but it does it enough to be bothersome. Has anyone else experienced this and if so, did was anyone able to fix it? I called GM customer service and they advised me to take it back in. I am so sick of having to take it in (it'll be #4 and I am pretty sure they won't fix it). Any feedback on this would be greatly appreciated.

Capt Bob · March 6

Well I’m the last guy to diagnose your problem but if you were holding a gun to my head, I’d guess you are experiencing the infamous “valve body syndrome”.

Please remember, I’m making this guess based on threads I’ve read on this Forum.

Edited March 6 by Capt Bob

Chevyfan3 · March 7

Sounds like the valve body issue and you have a 24' model which seems like that year is starting to become really bad for these. Be prepared for a long wait as no parts are available for this and I would stop driving the truck as you can further damage the transmission.

uh33nowit · March 7

Thanks Chevyfan3. Just spoke to the dealer and will bring it in again. They didn't have an optimistic view of what the outcome could be.

Chevyfan3 · March 11

No problem. I camped with a buddy of mine over the weekend who is a GM tech and he said the parts are becoming more readily available now and the backlog of trucks waiting for this repair at his dealership she now all gone. The new part # is 24065357.