My 2020 HTC has been a great running car at 10,600 miles. Drive it also in the winter on dry days in the NE. You will be fine. If any issue, the dealership will take care of it.
Do not fear… enjoy the journey

 

The best answer to your question will probably be found at Ron Fellows Corvette Owner’s School. I was there in late June and we beat the hell out of those cars. Granted they get more TLC than a C8 sitting in someone’s garage but the instructors reported very limited failures taking into account how hard they get driven during classes.

Like you, I’ve always had good experiences with Chevy’s - except my first one: a 72 Vega GT. I’ve got three GM products in my garages now with just normal maintenance including my C8.

 

I think one of the reasons for concern (at least it is for me) is the effect of the transmission failures. Most transmission issues in the past can usually be fixed by a short trip to the dealer. In the case of this DCT, it seems that if you get a CEL and the car can still move, the flush might fix it, but if not, its replace the transmission time. And from reading a bunch of threads, it looks like it could happen at any time, with cars less than 100 miles and cars with thousands of miles on them. The odds are definitely with you that you won't have a problem, but if you do, it pretty much sucks big time. Other than the transmission, any of the other issues with the car are pretty run of the mill issues that can be resolved fairly quickly.

 

Not entirely true. I've had two different DCT issues/CEL's. Both times they tried the flush first which did not fix the issue. However, the car could still be driven. In both cases the fixed the issue by replacing the valve body in the transmission (this also includes internal and external filter replacement and fluid replacement). It was just a mild inconvenience on my part. The first time I waiting for the car, and the entire procedure only took about 2 hours.

As the tech explained it to me, the passageways in the valve bodies are extremely small. He told me it can take as little as a microscopic particle to plug a sensor or solenoid in the valve body. If the flush doesn't free the debris, they have to replace the valve body. Hopefully they redesign the valve body so as not to be so susceptible to plugging.

 

I love my C8 but the engine died at 19.5K miles. Six of eight burnt valves, not sure why. Car has been in the shop for 45+ days now sent the lemon law paperwork yesterday requesting a new replacement vehicle.

Hope to prevail and that the next one is better.

Hope I win and the next one is better.

 

GregF do you mind sharing what dealer has the car?

 

It is Hendricks of Duluth but IT IS NOT the dealer’s fault! They have been awesome but they can not get two parts they need to install the new engine. They have scoured the entire country but parts are on national back order.

I can’t say enough how great Hendricks has been. They have been in constant contact, doing everything they can.

IMO it’s a matter of GM opting to put resources into new vehicles vs building a parts supply. Could be they’ve experienced more mechanical failures than expected, as well.

 

absolutely I didnt hear you blaming a dealer at all and I have heard many stories about how hard it is for them to get parts for these cars, as an atlanta C8 owner I was just wondering who you were using, I live on the south side in henry county and have no dealer qualified to go to, I work in Marietta and I have heard Days Chevy is ok, I used Steve Rayman for simple things and they were very slow and didnt seem to know what they were doing........Im at 1400 miles, still considering who I will go to should I have any issues (NONE so far)

 

OK, cool. Sometimes the message or even the time of the message gets screwed up and just wanted to make sure I wasn’t implying it was the dealer.

Not familiar with south side dealers. Hopefully someone on the forum can point you in the right direction. And that you don’t have any problems.

 

In addition to the tranny issues, the problems with failed components on the HTC are pretty disturbing.

 

Im not sure of the general failure rate for the C8 relative to other cars but when it’s your car it’s significant. I had 19K good miles then not so much.

But I still love the car and intent is to get another one.

 

I was going to use Day's Chevrolet at the suggestion of Classic Glass Corvette Club in Marietta. I also bought my C7 from Day's. My son-in-law used to be a mechanic there years ago and he and my daughter bought a Tahoe from them last year. My daughter went to middle school with the owner's son who is now running the place. When I needed my one year service last September on my C8 I couldn't get anyone to answer the phone in Day's Service department. I went to pick up my daughter's Tahoe this past February because she had it serviced while she was out of town and when I got there they couldn't find it! It took me 30 minutes to get her Tahoe. Not being able to get them on the phone was one thing but when they couldn't find my daughter's Tahoe that sealed the deal for me: no service at Day's.

Believe it or not Hardy Chevrolet/Ford/GMC in Dallas has been my go-to dealer for service on all of our vehicles - even my C8. It's there right now getting my free two year service and they said when I come to pick it up it will probably be sitting indoors in their shop. I saw one C7 parked outside today but it was away from the other cars they had serviced.

Since you live in Henry County maybe Thornton Chevrolet in Lithia Springs might not be too far out of your way. I know a forum member who uses them for service and has been happy.

 

Well, after nine months GM has still not been able to figure out why my alarm randomly goes off when the car is locked. First time it happened was when I picked up the car at the dealer. I had locked the car while doing paperwork, and the horn went off. I assumed I had inadvertently hit the panic alarm on the fob in my pocket.

Since then, the alarm has gone off a couple of times a week by itself. The other day, while locked in my garage, the horn started blaring at 10:30 at night. Thankfully, it shuts itself off after 30 seconds.

Both GM and my dealer have been on this constantly, have downloaded all the logs, and replaced modules. It was even referred to the GM engineering group in Detroit. They were 90% sure they came up with a fix, sent out a new calibrated module, and had it installed at the dealer by an area service tech they sent in. A day later the alarm went off again. They even installed a module with a transmitter that would send live data to the engineers as the alarm went off. For the ten days that part was installed the alarm never went off once. The random nature of these events is what makes it so difficult to nail down what the actual cause is. It has happened at several different locations, so nothing in my home is causing it.

i was away from home for three months, the module was removed, and the car was left on a tender. Got back two weeks ago and the alarm already went off on three different occasions . I sent another email to my GM representative at the executive resolution team, and got a phone call the next day. They want another shot at installing the transmitter to see if they can finally isolate the trigger. If not, they said they will consider a buy back option for me. I still love this car, and would reorder the exact same spec. So, at this point I am waiting for the delivery of that new module and hope it catches the alarm going off.

What a pain. My car was held for five weeks in QC, and I wonder if this was the issue.

 

My guess is RF noise problem caused by the OnStar module. There isn't much else that should be running periodically when it is hibernating.
Either that, or the Universe is sending you a message to GET OUT OF THAT CAR NOW!!!

Seriously though, I haven't heard of too many people with this issue. I have an electrical gremlin with my C8 that looks more like a software bug. When I switch on my parking cameras I sometimes get a strange 1cm chevron of sorts that flashes through all the colors of the rainbow just off center in the infotainment screen. I posted about it and thought it was just me because nobody else had seen it. Well, I now know that there is at least one other vehicle out there doing this flashing chevron issue. It's so intermittent though that when I have had it at the dealer they aren't able to reproduce it and send me along my way. Frustrating.

 

I know this sounds nuts, but how old is the battery in both of your key fobs? The reason I ask is about a month ago we drove my wife's 2020 GMC Yukon Denali to Florida. I noticed that the automatic running boards started working sporadically when I used my key fob with a three year old battery. Stupid me pulled the battery out to see what kind it needed, went to the store a few days later and bought a couple, and then left it out of the fob long enough when I finally put it back in the Denali no longer recognized it and now I have to reprogram it. In fact I'm going to do that this afternoon because my wife's key fob - with the three year old battery - is starting to cause some electronic issues. I took it to a car wash today and the rear hatch wouldn't operate normally. I got it home and everything was fine. I can't have two key fobs that don't work!

Just a stab in the dark.

 

You'd think the software log from the ECU would have shown if the alarm trigger event was via the fob button press, etc.
One thing I noticed is that when I am working on my car up on a lift, if I manually turn the wheels it will cause the alarm to go off, so there is clearly more than one sensor being looked at. Not just the interior motion detector.
When turning the front wheel rotors I didn't jar the vehicle or anything, just really smoothly applied pressure and got them to start turning at that tripped the alarm. You'd think that would be logged too though.

 

This is the first time I read about an engine failure. Did you track the car? And which 6 out of 8 valves: intake or exhaust? It'd be awesome if you hear what was the culprit, and share it here, to be aware of that.

Yeah, if it happens to you, the failure rate is 100%. Ha ha.

At any rate, really wish GM had put a proven DCT on the C8, like the ZF (or even Getrag). Or just use a regular ZF tranny, like BMW is doing even with M cars now, since they shift as quick as DCTs, and are super reliable. But no, let's use a first-time DCT manufacturer, save a few bucks, and let customers deal with the issues... and also the insane service requirements. I might pass on the C8 just for that tranny, and in good part because I'd have to take it to a dealer for 'hydraulic flushes'. But I'm also tired of mechanical reliability issues on my vehicles. Had to sell both of my ex-Vettes early on due to that (severe piston-slap on the C5, and a defective Tremec 6MT on the C6). Don't have use for a sports car until Jan, so will keep researching the C8, to see if the newly revamped DCT is any better. Or maybe it was just the case, which now doesn't require an extra 2 quarts to avoid sucking air. We'll see.

 

Let's be fair:

https://www.sae.org/news/2020/01/gm-...-collaboration

 

Understanding that it's off topic but I have a low mileage 2019 Yukon Denali and I had to replace the complete Driver's side running board. It as you said with yours, started working sporadically. The FOB has little if anything to do with running board operation. It's all initiated buy a door switch opening and closing. I went through s detailed troubleshooting process prior to engaging the dealer. Also, PM me if you're having any FOB range issues, a common problem with them too. Just a heads up in case...

 

Thanks for posting this link that gives a very different picture that the JCTx post.

The above post gives a very one-opinion view of this excellent trannyaxle. These guys literally have decades of experience in building these things and it shows. Yes, the corvette provided challenges to the trannyaxle needs and designs to fit everything into a such a compact unit that delivers well. It was NEVER before done this small this many gears, this smoothness, and the ability to handle over 500HP/FtLbs.
The accomplishments of GM and their partners in this trannyaxle is beyond expectations. Can it be improved? Hell yes. As all engineering can. Can it be stronger and fit in the current space? How? Maybe with a stronger metal casing and bracing. Maybe with titanium, which greatly increases the cost. I for one have had 3 C8s so far. And not one single problem with anything at all. Not one. It is a dream tranny that will improve with the modifications to the current tranny and the redesign of the C9 tranny, now fully underway. A big congratulations to GM for giving us a super car at a Chevy price with a new-world efficient trannyaxle. What is not to like about that?