Completely disagree. It's too much of a lopsided viewpoint when the only people that post are the ones with problems. It makes everyone think that every car has issues. They do not.

 

Year, and mileage please.

 

It's quite possible that this isn't related to a mechanical problem with the DCT but a software problem or something that can be fixed without replacing the DCT. Please report back on what the dealer says.

 

Do a search online of C8's for sale, click on a Carfax link when it's provided and look at all the times C8's have been at a dealership for service other than oil changes. It's not pretty, I have and I don't want that for my next new to me or new off the showroom car, until GM/Tremec fixes the DCT issues once and for all.

 

I'm on my fourth DCT and so far they only show up as "transmission service" on the Carfax report, so a lot must depend on how the dealer sends in their report. Personally, I think GM/Tremec has gone as far as they plan to go with issues on the pre-2024 DCT's.

Two of my DCT failures were, as far as I am concerned, were a 100% failure of any QA process either at GM or Tremec. The very original DCT had a porous case and just a visual inspection was enough to have said that this was a bad casting and should never had been used. The third unit had a physical crack in the DCT casting that was visually leaking oil when the shipping crate was opened. Despite endless pictures from myself and the dealer no one from GM could ever produce anything saying that the unit had ever been inspected, tested or signed off as ok before shipping.

The second one that had an issue was because the differential would scream like a banshee at certain rpms. On a "normal" transmission I would have said it was a failing pinion bearing. GM tech listened to a recording and didn't hesitate to approve a new DCT.

As a side-bar. On the last replacement I had hoped that the latest and greatest 2024 DCT version would be used but there is no (easy) reverse compatibility between the 2024 trans and the earlier models. Different cooling scheme, different piping routing, revised software, etc.

 

I'm at #2, maybe #3 soon as I also have that whistling which the first did not.
Why the fluck would I logically think buying a z06 is worth it at this rate?

 

There have been 143,000+ C8s built according to the Internet. I'm in the camp that feels bad for the owners that suffer through a transmission failure but because I've owned one of every generation since the C4 over the last 30 years and only two of them went to the dealer for minor repairs I think the percentage of complete DCT failures is very, very low. I don't consider anything other than replacing the DCT a failure if they only flush it or replace one part to get it back on the road.

 

You're preaching to the choir here. Nobody takes into consideration the volume of vehicles built in relation to the failures. But I've given up on the subject. People will keep screaming "The sky is falling!"

 

Here’s a different perspective: check out the forums for other car brands and objectively by the percentage of the posts, you’ll notice items/issues bubbling up. I know the percentage of these posts depends on how many members the forum has, how many are posting and other variables but if you take a step back you can observe a trend. In our case, it’s clear and accepted by all of us (I think &#128512 that a significant number of posts have shown transmission failures, sometimes multiple for a single customer which, in the automotive industry, indicates very poor quality. The big problem is that GM replaces a bad transmission with another bad transmission without trying to fix the root cause. It’s a total lottery. I applaud the positive attitude of “everything is peachy” expressed by some of the folks here but we’re really fooling ourselves by not looking objectively at this phenomenon.

 

Your definition of "objectively" is very subjective.

 

Interesting article on Corvette Blogger that Chevrolet Corvette scores first place in J.D. Power's 2025 dependability study.

 

ETC123…I agree and well stated..the fact is that the C8 is the first rear engine DCT platform for Chevrolet and it’s a shame that Chevrolet and tremmec allowed the bad castings and poor tranny components to enter the assy line and they need to own up to it….but the car is an amazing performance machine for the money.. that doesn’t lessen the pain that CF members feel everytime we see a post about the tranny problems … and so all I can say is I’m sorry for the folks who are getting a bad tranny in their c8s but would encourage them to stay the course or look into the dealer buying back the car and get another one if that’s an option because when you get one that is problem free..you’ll appreciate what the car is capable of doing… so try and stay the course
🤙😎

 

It's been that way for many, many years. My C5's rear smog pump check valve would fail every few years. The dealership had to remove the intake to do the job. Why wasn't the design improved? My guess is that the engineers were working on the C6. The Quality department obviously did not think that SP check valves, diff seals, column locks, and EBCMs were worth fixing on a more permanent basis. It seemed to me that many owners had other GM vehicles that were also not very reliable. They had no basis of comparison, so proclaimed that all sportscars have plenty of problems.

 

Robb ...you must really love your c8

 

The C8's do have problems: My experience with a 2021
3 transmissions
4 dashboards
HTC electrical failure
HTC mechanical failures
Definitely my last corvette!

 

I think your's was definitely the outlier and not the norm - bum luck.

 

My experience with problems with a 2021:

 

This thread is called "C8 Problems." If you want to share a positive experience with your Corvette, feel free to start a separate one. Right now, it's mostly fanboys dismissing issues and acting smug toward anyone sharing their problems.

 

Nope. I'm going to sit here and debunk. If people can make blanket judgements here, I will argue. If you want to simply post the problem and discuss it, fine. But when people condemn GM as a whole because they had a problem, I cannot sit here and let them spew misinformation. Smug fanboys? Who are you? Your profile doesn't hold much water. I've seen too many trolls create accounts just to trash a brand. So again, who are you? From what I see you fit that profile.

 

Truly GM's strongest warrior