I mentioned issues I was having with my A8 in my Z51 coupe vin 6623 in another thread where I was announcing that I had picked the car up and was loving it except for a little weirdness in the transmission. Figured it was time to start a dedicated thread for the rest of the story.

With 79 miles on the car as I was coming to a stop on a busy freeway off ramp yesterday the car felt like it downshifted really hard and refused to move another inch. Tried all the driving modes, manual shift and paddles with no help. I was in the left lane of a 4 lane off ramp and cars were going around me on both sides. My left side was just large gravel. I was waiting for some to hit the car but luckily none did. The highway patrol finally showed up and hand pushed me in neutral off to the side of the road. Rollback picked up the car about 30 minutes later. All of this coordinated through OnStar.

Of course this was in 90+ degree weather as well. Fortunately the engine was still running so we had AC.

Got the call today that GM is shipping a new transmission from the vendor in Ohio. Service guy says he thinks the Engineers know what is wrong but they wouldn't say. There were no codes but they couldn't get any of the shift solenoids to work. He did say they could get it to go into reverse in any shift position including drive. That's more than it would do for me yesterday. Guess it could have actually gone into reverse when I stopped and that was the violent shift I felt.

I'm really disappointed and at this point my sense of confidence in the car is shattered.

Oh, the weirdness that I reported in the other thread before this happened was like the transmission was coming out of gear while driving about 45 mph in ECO mode. The engine would rev up then come back down without any difference in feel to the car. It did this a few times then I switched to Touring and it stopped. About 5 miles before getting to the off ramp I noticed the same thing again.

I'll try to get autopsy results but I have a feeling those will be privileged information.

 

I don't understand why everything has to be controlled by electronics and computers. Going into reverse when the stick is in drive? Damn I hate technology sometimes.

 

It happens, you'll be fixed up shortly. Must have been a nice ego hit when your new C7 is getting pushed off the highway...

 

For someone getting a Z06 with the A8, I am not happy to hear about this!
Is this an isolated incident so far or have there been many others with issues?
I normally spend time on the Z06 forum, but haven't seen any reports here except this one.

Good luck with the new A8.

 

Ouch, that sucks.

 

I don't suppose it could be one of the ones with a cracked case, could it?

 

Wow. Lots of sympathy from me for your troubles. No sympathy for the heat though

 

Yea felt like crawling under a rock. I did wonder how many C7 sales were getting killed by the sight.

 

I have not seen any other reports of A8 failures on the forums I visit so hopefully there is no pattern. I was surprised as well since I know the A8 has to have undergone a lot to be allowed sit behind a Z06 motor but S**t does happen.

 

I hadn't heard about that one. Was it A8 transmissions?

 

This is exactly why i got a 2014 A6 and did not wait for the A8. Everybody was talking about waiting for the second year to avoid issues, but in reality, the A8 is really the first year of something new. The A6 has been proven for years. I would have waited for a 2016 if i had to wait. This sucks, but hopefully it gets figured out.

 

Check post #11

https://www.corvetteforum.com/forums/c7-general-discussion/3537804-shipping-hold-update.html

 

I have 15k on my 14 C7 with zero issues and still as fun as the day I pulled it off the lot a year ago. You'll be in good shape soon, theyll take care of you. Lots of fun ahead.

 

 

LOL you bought a first year car where everything was different but the reason why was because you wanted to avoid a car where only the transmission different?

 

Don't you honestly think that a new transmission is a hell of a lot more serious then a new body style? The A6 has been proven. A new transmission is a lot more serious...

 

Sorry for your troubles. A new Tranny in a Car w/ 79 miles? Some scary stories coming from this new generation. Good Luck w/ the fix.

 

That's what warranties are for.its normal to have something like this happen and consider this perspective...

It's cool gm stepped right up and is replacing the entire transmission.

If your really concerned.....about the future of the vehicle. I always felt the GMEPPwarranty purchased off a forum vendor....

They are so inexpensive when shopped on this forum...it's chump change for peace of mind.

Sorry to hear of your getting stuck on the side of the road.

Had a similar occurence with my manual transmission z06 on a four lane highway and it was a drag until I had it towed to a dealership and had it fixed.

You re car will be as good as new.

 

You are talking about a total new frame and engine with cylinder deactivation and direct injection and electric assist steering. Transmission would be the last mechanical component I would be concerned about...

 

The problem you describe above is what happens if the engine decides to get into deceleration fuel cutoff while the torque converter on the transmission is UNLOCKED, engine speed will drop really quick and then shoot back up. This is assuming this was happening while coasting down.