I have a 2022 C8 Convertible which is now on its 3rd transmission. Love the car, but would be more comfortable if GM would come clean regarding the root cause of the transmission failure. I have asked several times but no answer. They did extend the warranty on the transmission by 4 years, but in my mind that is the very least they should do. With the first failure they replaced the valve body, the second failure I got a new transmission. The third failure I got another new transmission. I was lobbying for a new car, but at the end of the day I like the car I have and GM wasn't going to pony up a new car for me. This is a safety issue, the last time the transmission went the car just stopped in the middle of 5 lanes of highway traffic. I used the paddles and bumped along to an exit. I parked the car and took some deep breaths, put it in reverse and it wouldn't move. Tried again after 5 minutes and It moved enough for me to clear the parking space. All the time the check engine light was mocking me. Took it to the dealership and got a loaner. My car which was always garaged and covered sat in the dealership lot for 3 weeks awaiting a new transmission. I paid $128K for this car, the most I ever paid for any car, they still can't or won't identify a root cause. I've learned more from reading these posts then I ever got from either the dealer or GM.

 

Agreed. My '23 non-Z51 has 3300 mi. on it. Noticed a whine last week from the back that varied with RPM's. My dealer tells me it's the trans. Ordering me a new one. Still drivable so, at least I can keep it home until the replacement is done.

 

Transmissions have failed for several reasons.

Some have been fixed.

 

I can't say that I would keep ANY car after 2 transmission replacements.

 

I can’t imagine you being unlucky enough to have a 3rd go on you. Frankly I’m not sure that I trust your service department to properly diagnose issues, they sound swap happy.

 

9 years of transmission warranty is pretty incredible! Nice gesture from GM, and good peace of mind for you.

 

How could it be fun to drive a car when you have to worry when it will break. If it's not fun to own why own one?

 

I'm on my second transmission and warranty or not, the absolute nightmare experience and being without my car for three months is not something I want to endure again.

 

I don't think the dealer makes the decision for a trans swap without GM approval first.

 

Dealerships know what to say and how to say it to get the warranty outcome they want and/or if the tech sucks executing diag steps they could end up with innocently wrong information. Either way the service department absolutely factors into how a situation works out.

 

I don't agree with this on something like a $20K transmission. GM will require the diagnostics it needs to validate a warranty claim.

 

As someone who has actually been there done that, that is so untrue as to be someone's made-up BS. It simply doesn't work that way. Those of us who have actually paid warranty charge-backs can attest to the real facts. Are there potential mistakes made as in any other job...absolutely! But, if you actually had any idea how the process works, you would realize you don't pull those kind of things on a regular basis and get by with it.

 

C8 transmission is my biggest worry. I will be buying a Lotus Emira when I sell C8 before the powertrain warranty runs out.
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Currently own:
2019 Mustang GT Premium 6MT Daily Driver
2023 Corvette Stingray 2LT (Ron Fellows Corvette Performance Driving School Graduate)
2017 Porsche 718 Cayman
2009 Jeep Wrangler Rubicon

 

Oh yeah you caught me I’m just making stuff up. Its not my fault you never figured out how the world works but it’s never too late…most things aren’t black and white and there is a very big spectrum of gray. Competent service writer/managers/warranty admins know how to work the system to do what is right for there customers (and sometimes their own bottom line), bad ones will screw up and get claims denied.

 

Yes and those diagnostics are fill out this form and tell us what you did and what was the outcome. Even if they are looking for specific computer readings that doesn’t mean the tech doesn’t screw up the process.

I certainly not claiming that this was absolutely the case here but I would get a second opinion if the same dealer told me twice that my transmission needed to be replaced.

 

That is a good one. I spent 40 years owning and operating new car dealerships doing hundreds of millions of dollars of warranty work and never "figured out" how it works! If only I had listened to the drunk failed mechanic at the bar and discovered the real world!

 

Bad trasmission from C7 to C8... no more words but GM don't want invest to new transmission because they already sell the car with bad transmission

The automatic transmission made to be a problem for user and good chance to earn for cars constructors!

 

In my case I had PDR recordings totalling almost two hours of the tech and service manager driving around with a laptop attempting to get the data GM "needed" to make a determination. They wanted to swap it out but the data had to "prove" a problem worthy of replacement. That data was uploaded in to the system and reviewed by GM. Based on my experience there was no cheat or way around it, my dealer was just as frustrated.

 

Fair enough, I have no doubt that some claims get a lot more scrutiny than others. I’m still skeptical of two failed transmissions without personal witnessing the diag/data myself, this certainly could be without merit though as I have no reason to assume they aren’t competent.

 

Owning and operating might explain why you don’t actually know how your boots on the ground really get their jobs done. Like I said the world is just not black and white.

This transmission issue might be a big enough issue that multiple eye are on it and all i are dotted and t crossed but if you really believe there is zero wiggle room in the warranty claims process in general and the techs and service admins have no effect on outcomes then I believe you’re being naive.