Scott O. Miller

I have a 2016 Z51 3LT, 5800 miles. At low sustained speed when I slightly depress the accelerator, the entire car feels like I am driving over rumble strips. Same at high sustained speed when I give it a little more gas. Car has to be at full op temperature. Thoughts before I take it to shop for diagnoses?

FastC7GS

Oh no diagnosis needed you have a bad torque converter. They will first try to pull the wool over your eyes by doing a triple flush of the trans fluid. Then when that fails they will have to tear the whole rear end out of your beautiful car including body panels, and replace the T/C. PM me and I will send you the brand quality mgr. of Corvette business card. You keep calling him and give him my name. He will have to help you and my name will make him all warm and fuzzy inside like drinking a gallon of bleach!

Pisswilly

Wow, another A8 horror story!

G8ME

Had mine replaced in my 2015 no flush, straight TC replacement. My dealership is great, when I told my service advisor another advisor heard me talking and immediately stated you need a new TC. So far so good.

Dif

Are you saying it only does it's at full operating Temperature ?

Ernest_T

Yes, the car won't go into V4 mode until it reaches operating temp.

AORoads

I hope your shop knows about this problem. If not, tho slightly out of your locale, Criswell does know about it in Gaithersburg.

rmorin1249

Threads like this are going to encourage folks to either dump their car or buy an extended warranty. It's a real shame. GM should bite the bullet and send dealers a way to permanently disengage V4 mode. If Range can do it there must be an easy way to reprogram the tranny permanently.

ddelallata

Here's the bulletin in case your local dealer pretends they've never heard of this problem.
The triple flush remedied the problem on my 2017 A8. I use the Range module now 100% of the time.
http://www.corvetteactioncenter.com/...tate-1324.html

MRCOUPE5

My 2016 Z51Coupe 12,000 miles Long Beach Red is going into the shop at Criswell in Gaithersburg
Monday morning .. I can be going 37 MPH and it is in V4 .. Been driving it in manual
mode for the last 3 weeks . Have shutter problems at highway speeds while i Auto 8th
gear .. Getting the flush , will let all know of the results . Still have 18 months on the
warrantee ..

Zymurgy

Chevy can't do it without re-qualifying EPA gas mileage, CAFE, etc. https://www.corvetteforum.com/forums...post1594912034

kitesurfer

your guess! haha

bjones7131

following this post, good luck

NSC5

GM will either extend the warranty on the TC or face a large class action lawsuit; either is dumb compared to actually fixing the problem.

IF GM disabled torque converter modulation during V4 mode the A8 would have the same level of engine vibration as the M7 in V4 mode and fuel mileage should show a slight but not significant increase because the torque converter would no longer have slippage.

I will be ordering a new GMC Sierra pickup but it is the HD model with diesel power thus no AFM. My Z06 is the last GM product I will buy with AFM and torque converter issues aren't the only long term issue with using AFM. I have been highly brand loyal for years but flawed technology is flawed technology and continuing to use it doesn't change the basic fact that it is flawed.

Jmcdude

I'm just biding my time. I'm half way through my 3yr/36k BtoB warranty period and have 12,000 miles on it. Hoping GM will either do a recall or TSB before my 5 year/100k drive train period is up. If not I'll have to purchase an extended warranty at that time.

rmorin1249

Then they should do what is required. I predict a lot of unhappy owners when their TC fails out of warranty.

CP

Oh the humanity!!!

spinkick

There is a TSB on something like this. Could this be what you are experiencing?

http://www.stingrayforums.com/forum/...tml#post524633

23/C8Z

fluid viscosity. And type. Jeff strausser told us at Carlisle this is the fix. The triple flush with new type fluid. Hope that helps a little.