Vettenincam

Hi there folks,

My intro could be really long but I’m gonna spare you that.

Bad luck with C7s.

I bought a 20,000 mile 2018 GS 2LT from Carvana (I know, no point in being stupid if ya can’t show it.) Lots wrong n it went back.

So, the search starts again and I find a 2019 GS LT2 LB Red-Kalahari with 2502 miles, yes 2502 not as typo. Test drive went well. Nothing acting up. Made a deal with the owner n bought it. On my way home it started shuddering. Didn’t do that on the test run. I’ve read many reports about trans fluid flush being needed to fix the issue and/or a Range OBD 2 plugin to fix it. What is your recommendation for fixing this issue?

Problem #2 I stopped for gas and the rear deck lid popped open. Pushed down on it lightly and it closed. Get home and it pops open again. This time it’s terminal. It will not close and/or latch.

Major frustration now wanting to drive my new to me (now 2600 mile) car and can’t because of the rear deck lid not closing.

Any and all suggestions will be greatly appreciated.

Bill

76-Vetteman

I hear what you are saying and the frustration you experience with your new 2019. Yes, shudder can be expected, especially with the low mileage on the vehicle.

The rear deck lid can be as simple as an adjustment.

These problems can be easily resolved at a good dealership nearby. Again, I understand the frustration, but you've probably got a near perfect C7, especially with the low mileage. It just takes a little time to work through these small problems.

Soon You'll be rolling miles with smiles.

449er

Welcome to the forum! You have come to the right place to ask all questions Corvette related, I'm assuming that you have an auto trans? You may be experiencing the shudder that some C7's have, the fix was (is) to have a triple flush performed by your dealer to add the newer trans fluid to stop the issue....at some point in 2019, GM transitioned to the newer fluid so your car might have been built before or after that switch over

Squeaky Wheel

I believe the switch to the new fluid was on transmissions (not necessarily cars) assembled after February of 2019. So you’ll need to know the build date of the transmission. Hopefully, with that few of miles, no serious damage has occurred. Does the shudder occur if you are using the manual paddle shifters? If not, I’d suggest using them or install a Range device until the triple flush is performed. Actually, even after the flush, I’d still recommend keeping a Range device plugged in to prevent the AFM from cycling between 4 and 8 cylinders.

DGA3

I like your positive attitude.

Vetteman Jack

Good advice above. Hope you can get the problem areas cleared up with minimal cost and then get to enjoy your car.

BAT

If the shudder isn't from the auto transmission, it *may* be from the GS wheels, assuming you have the OEM Speedline wheels and not an aftermarket set.

The hatch lid.... are you noticing you're hitting your knee on the lower dash area as you exit? If so, you may be hitting the hatch release button while exiting. It not latching after the second time, may just be the locking mechanism was engaged (before the latch fully closed).

Rabbi

If the car still has factory warranty the trans flush is covered otherwise it's about $700 at the dealer.

JasonR2021

I have a 2019 Stingray and I have had the rear hatch pop while driving as well as the passenger door pop open with my wife in the passenger seat! My issue was a weak battery as it had been a few weeks between drives. My issue was fixed by putting a charger on it overnight. As is mentioned on this board often, these cars are sensitive to battery issues. I have also had rough transmission shifting while the battery was weak. This also cleared up after a good charge on my maintainer. Hope this helps.

Vettenincam

1-29-2024

Thanks for the replies folks.

Still looking but haven’t found anything yet on the rear deck issue. I did find out there is a fuse block under the back deck cover that has a fuse for the pull-down motor. Gonna check that later today.

Unfortunately for me it’s out of warranty so I will get to pay for the trans flush if the Range bypass doesn’t work.

Please continue with problem solving ideas. They are much appreciated.

kaplana08

The C7 A8 Transmission is a dud. There have been problems with the transmission for years. The Shudder is a well known defect along with Torque Tube defects. Some have had luck with the triple flush some have not. Many people unknowing through no fault of their own continue to buy a C7 with the A8 transmission. There are some who will continue to defend the A8 but the facts are the facts. In reality GM should have eaten every vehicle that came with the shudder but being GM who they are that never happened. Its a shame that people buy their first C7 Corvette used and have to have this problem. You are far from the only one. Try The Triple Flush if the shudder is the cause You probably will have luck with that, PS.. I doubt that it was the first time that shudder was detected. Just my opinion.

Pktrusty

I would change the filter in addition to a flush. I am not saying it is it, but seeing the filter will help determine if it could be the culprit. If you drain the pan, you don’t get it out of the torque converter. Just a heads up.

As far as the rear latch. Did you make sure it was in the open position? When I put mine on the trickle charger, I flip the latch so I can keep it open without the light on. Hit the rear trunk button and then see if it closes.

best of luck.

Vettenincam

Thanks Kaplana08Ya, I heard and read about the issue but had no signs of problems during the 15 minute test drive. Unfortunately, it seemed ok when I drove it. Notice it about 20 minutes into my drive home. Pretty sad a car with 2500 miles has issues like that and is out of warranty.

I’m going to get the flush done at Rydell Chevy in Northridge and if it doesn’t fix it I know of an attorney that specializes in this type of stuff.
Wish me luck!!

unclecookie

I have had the same problem with the hatch not closing properly. As JasonR2021 said, a weak battery can cause that. If the car will start, try closing the hatch with the engine running. When I had the problem with my hatch, it would close with the engine running but not with it shut off. But at least make sure the battery is in good condition and fully charged.

kaplana08

Many have had success with the triple flush. So hopefully you will also. Not sure but I think after the flush you have to give it a short time to work. Good luck. and enjoy the car.

Vette Ski

Are you sure you aren't hitting the hatch release with your knee as you exit the car. I did that a few times myself.
Good luck with solving these issues !!!!
Rich

JasonR2021

Don't give on it just yet. I bought my 2019 used in 2021 and had the shudder so bad I thought it a tire was flat! I also had the infamous warble. I printed out the TSB's for the shudder and the warble and took the car to my dealer. A week later I got my car back with those issues resolved. It did take little time for the transmission to fully work out all the shudders. It's not the smoothest transmission by any means as I still have some weird, clunky shifts when it's cold and my downshifts are very harsh but mostly it's been okay. I would also highly recommend a Range DOD afm disabler. It's not cheap but worth every penny.

JasonR2021

I also had this happen a few times and someone here recommend the little carbon fiber trim piece on Amazon that fits around it. That fixed that issue as it slightly recesses the button.

Punisher44

The A8 is not a dud their is actually nothing wrong with the A8 it's what they did to make some not all of them fail. Wrong fluid was a big issue and the AFM is very hard on the trans. I have a 2019 GS the correct fluid from the factory, it was built April 2019. I have had a range device since new. I just passed 10000 miles and have not had any issues with the trans or cracked wheels. I believe some of the tq tube issues are also the AFMs fault. V4 mode and the vibration it causes is one of the issues for the drive train.

fuzzy03cls

Before you go all out.......Check the date on your battery. If's it original, or more then 3 years old, replace it. Your problems may go away.