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An 83 page Class action lawsuit requesting Jury trial was initiated Dec 18, 2018 for A8 woes in Florida Southern district.
Duffy et al v. General Motors, Inc.
Hard to tell how this will actually proceed as the lawyers joust, banter, and collect fees. However, I am anxious to hear the GM 'Magic Mouse Milk Defense Strategy'!
Fortunately, I am not yet affected by shudder, only the small burps/hesitations caused by AFM.
Last edited by kensredvette2; 01-01-2019 at 09:54 AM.
Lawsuit is the way to go. They wont recall it, but, they could at least extend the warranty on it.
I'm really confused on what to do because my C7 GS has a stick shift but I feel like the clutch is already worn down at 4000 miles. Its 3500 to replace apparently. I thought of trading in a getting a Automatic but that doesnt seem to make sense either if it fails.
I wonder when GM refers to the 'NEW' Mobil 1 LV ATF HP fluid if it the same formulation as the the original Mobil 1 LV ATF HP fluid and GM is only referring to it as 'NEW' to designate it from the older original Dextros HP fluid that they used in earlier A8 transmissions? Any thoughts?
Lawsuit is the way to go. They wont recall it, but, they could at least extend the warranty on it.
I'm really confused on what to do because my C7 GS has a stick shift but I feel like the clutch is already worn down at 4000 miles. Its 3500 to replace apparently. I thought of trading in a getting a Automatic but that doesnt seem to make sense either if it fails.
What do you mean by "worn down", it's slipping? It shouldn't have these issues that the auto has.
A8 shudders may have another contributing problem source.
I remember when Tadge was filmed in the Corvette factory, standing by the power-train assembly, which included the motor, drive-line assembly and rear transmission and differential.
He mentioned something in that video about how the AFM sets up harmonic problems in the drive-line and how the drive-line assembly, in which the prop shaft spins, had to be made over 300% stiffer to handle those vibrations:
Look at or about 1:20; he talks about the vibrations caused by the four cylinder mode.
I often wondered about that when I hear about the A8 shuddering problems. Maybe those big bearings at either end of the drive line assembly contribute to the shuddering, not just the A8 itself.
I'm lucky enough to not have that problem in my M6, but I AM considering buying an A8.
What do you mean by "worn down", it's slipping? It shouldn't have these issues that the auto has.
Well the bite point for the clutch rose again and its getting fairly high. I feel like there is some minor slippage though passed the clutch tests I found online (when the vehicle stalls quickly instead of slowly fading). Going to take it to the dealership and see what they say. I love the stick but I confess I've slipped it a few times on hills by accident in the city. Its just hard for me to balance it right.
I'm lucky enough to not have that problem in my M6, but I AM considering buying an A8.
Why would you do that? I have an A8 with issues and am considering getting out of it. lol Playing GM's game about changing oil, putting miles on it instead of just fixing the problem is getting old really quickly. If I wanted a car to constantly take back for service I would have purchased something with 300K miles on it.
My 2016 2LT Z51 with 35,000 miles just got the transmission replaced under SB 16-NA-364. I had the shudder, 3-5 second delay when putting into reverse while cold and 1-2 seconds on all warm shifts, I could stop on a down hill incline and put into reverse and the car would roll forward 3 to 5 feet before going into reverse, and I had extremely hard shifts from 1-2-3-4-5th gears. I hope this re-manufactured unit fixes my problems but I will not be holding my breath. Its a shame a car as fun to drive as this one is can be such a downer to own. This is probably my first and last Vette (at least with an A-8). I have an artificial right leg and can not drive a M-7. My car was in the shop from Dec 5th 2018 until Jan 2nd 2019. I bought it new in June of 2016. Build date of late Nov 2015. The car has never been tracked and honestly is not driven hard at all. The flex plate was replaced at 7500 miles.
Picture of service order is below:
Last edited by tnbirdieman; 01-04-2019 at 10:26 AM.
Same here, Flush at 4,500 miles... its been 200 miles everything seems to be fine. Was told the wrong flued was used originally, Ate away at some components. New flued has new properties in it... Was told
if problem doesn't go away it requires a torque converter replacement… Rick Conti has a video on the subject. One other thing, if you encounter the shudder problem place it in manual mode it will go away. For some reason the shudder doesn't do it in manual mode. FYI
Manual mode turns off the V4 operation of your engine. I will never understand why they would ever want this in any vehicle! I have made exhaustive tests over the years and have never seen any increase in mileage....the internal rotational friction of the engine goes way up and the available torque is very much reduced. It is amazing they are wanting this to be fixed with snake oil changes to the transmission
.
I traded in my 2017 GS and ordered a 2019 GS figuring they might have the problem rectified as they have known about the problem for 3 years!
See GM Bulletin 18-NA-355 for the latest go round on this. Every A8 2015-2019 should be recalled. Every Cadillac, Chevrolet & GMC that they have made since 2015 included. I also am very sad that I traded my 2012 GS A6 for this mess.It did not have AFM and with an A6.......all the gears you would ever need !
Last year I have had the flush done, torque converter replaced and the transmission valve body replaced. I run the Range device plugged in all the time.
This weekend I had an opportunity to drive the car on a trip of about 300 miles.... the shudder is still there! The wheels has been checked and are OK. If the problem was the torque tube would the vibrations be constant instead of intermittent?
Why would you do that? I have an A8 with issues and am considering getting out of it. lol Playing GM's game about changing oil, putting miles on it instead of just fixing the problem is getting old really quickly. If I wanted a car to constantly take back for service I would have purchased something with 300K miles on it.
because I would buy a 2019 A8, which is likely to have solved many of the problems inherent in the older version; the M7, with its crowded gates, is very uncomfortable to drive. there are no other choices if I'm to have a new Corvette.
because I would buy a 2019 A8, which is likely to have solved many of the problems inherent in the older version; the M7, with its crowded gates, is very uncomfortable to drive. there are no other choices if I'm to have a new Corvette.
I would think long and hard about that. I just got a call from the dealership doing a second oil change in mine. We're gonna have a talk before i leave with it and I am certain I am done with GM's faulty vehicles after this whole episode. Too many good cars out there do deal with overpriced junk.
That's interesting, do you know the date of that video?
On our 2017 Z51 with the big tranny cooler, the highest trans temperature I've ever seen was about 160'F after multiple autocross runs.
They'd need to pre-heat the fluid before dumping in, or put a blowtorch against the tranny to get our temp up to desired.
Or maybe there's an easy way to bypass the cooler...
My 2016 Z51 is the same, I have NEVER seen the 8 speed transmission temp above 125 degree even in very hot Florida weather under normal driving conditions. I did have my fluid changed to the new style in October to solve the shudder problem and the service report said NOTHING aside from changing the fluid. I wonder if the new procedure coming out will be to change the fluid (to ANOTHER new style) and do the relearn? The shudder has come back in mine so I WILL have the new procedure done once it is formally released.
A8 owners with the "shudder" problem. I have had the fluid (triple) flush with fluid type change, torque converter replaced, transmission valve body replaced and set to learn mode.
I have put on about 500 miles or so since the last fix and still have a noticeable shudder. Mostly noticed when in cruse and pulling a slight uphill grade (or more) I fell a repetitive shudder sequence. I am not sure if the shudder will lead to some catastrophic failure in the future but with my OCD it is hard to live with this problem on a $100K car.
So with that said GM is going to have something different planed if they have a "New" fix for 2019.
For you AFM haters I have the Range device and no change. It works as advertised and it will stay, but not the fix.
Has the tech driven your car at the speed/load where the shudder is being felt with the torque converter lockup clutch commanded to locked mode using the GDS2 tool? GM calls for this step in their various TSBs but I expect a lot of dealer techs are shortcutting this part of the procedure and going directly to the fluid flush procedure.
If shudder continues with the lockup clutch manually locked and manually unlocked (via GSD2 tool command) then the lockup clutch isn't the issue. Your car could have an underlying engine issue in addition to the typical 8L90 issue. Typically the new fluid will mask the symptoms for a short time.
I agree that GM needs to quit playing games with the magic fluid of the month and addressing the root cause of torque converter clutch shudder.
01-01-2019, 09:42 AM
