Kwagnerhvac

If the dealer doesn't come up with it themselves, I am going to provide the service bulletin that ddelallata was kind enough to provide to me. That is exactly the symptoms I am having.

Mike Campbell

I do have to smile when I read about the "bulletproof A6". The reason is I had a 2006 A6 Monterey Red coupe that I ordered and it was delivered in January 2006. I was driving in a local 4th of July parade going about 1 mph when to my utter embarrassment the tranny crapped out at the end of the parade. I managed to limp several miles of stop & go to the dealer's but they were closed since it was a holiday. So my buddy followed me and we left the wives there while he drove me home to get my other car. Meanwhile several people had been there and opened the door and pushed the car in. Later the following week they called and told me they'd put in a new trans along with the computer. Seemed the whole assembly is held in place with a snap ring which broke. Anyway they fixed it and paid for everything. But I can't tell you how many people said what a POS trans the 6 speed was and I should have never bought it. Well I kept that car until March 2014 and just so you know I ran mostly at Englishtown's Corvette Challenge along at Atco and at Maple Grove all told over 200 1/4 runs. Never had any other problems with that trans. My point is, there's thousands of A8's out there with out any problems that are getting hammered every day. I'm sure that GM's motivated to fix them all ! So do they need an overhaul or re design ? I don't know but would guess yes. However, to read some of these posts and speculations that are over the top doesn't really solve anything. If there's any that have been fixed, then you have to surmise that GM's on the right track.

NSC5

I sometimes think that the car could burst into flames in the service bay but some "technicians" would state it is OK since the CEL didn't come on. That illuminated CEL and the stored DTCs (Diagnostic Trouble Code) associated with it started out purely as part of the emissions requirements and have since greatly expanded to provide a lot of assistance to service personnel in identifying and solving issues but by no means is every drivability or operational issue going to result in a CEL and even when it does the DTC(s) set may not provide a direct path to the root problem.

Several years ago I had a CEL in my 2006 GMC Sierra that was illuminated prior to even starting the truck. It started and drove normally but once started the only way to shut off the diesel engine was to pull the ECM power relay. The only stored DTC was for loss of communications between the engine and transmission controllers and I traced the problem to rodent urine which created a leakage path between switched and permanently powered 12 volt buses when the humidity was high enough. In many cases an illuminated CEL is the ultimate example of an "idiot light" because it doesn't come on for every readily observable issue and when it does come on the stored DTC(s) can easily lead the repair person down the wrong path. DTC(s) are a tool and not a replacement for a competent individual who still needs to have a basic operational understanding of the vehicle and its component subsystems.

boraxman

If they can't diagnosis it do you really want this place working on it?

andy21

I think after reading this thread I'm going to buy me a Range AFM Disabler.

Guess I am lucky to not be experiencing the problems some of you are describing.

Maybe GM should just reprogram our cars so only Eco goes to V4. I wouldn't mind the recall at this point to correct this.

Kwagnerhvac

I will find out tomorrow if they can or can't diagnose it. If they can't, they won't be working on it.

Kwagnerhvac

I believe the car will not go into V4 mode if you put the gear shift in the M position. However, my car will still experience the issues in the V8 mode. Just not as quickly or severely.

iclick

It's almost too easy. All they would need to do is make a change in the TCM and/or ECM programming, so there must be a reason why they don't take this cheap approach. I suspect it relates to CAFE and EPA mileage ratings. Changes in EPA ratings have been done in the past after an audit revealed an error, but I believe all of those have been due to inaccuracies in manufacturers' ratings revealed after an EPA audit. In the present case they'd be changing the car's programming that will directly affect mileage. Maybe there would be penalties involved, higher than the costs of the TC repairs. Just speculating here.

RedC7AZ

More like YOU WISH any hits the A8 takes on resale trickle over to the A6 and M7.

Someday in the distant future when I sell my A6, if by some odd chance I run across and uneducated buyer I'm going to educate them real fast.

"Hey Mr. Buyer have you heard of a internet site called the Corvette forum?"

iclick

For one, the o-ring issues that cause delayed engagement (#16-NA-014). That isn't related to the TC and my car also had this problem. GM chose not to fix it while the tranny was already out for the TC job because I couldn't reproduce the problem at a dealer. It was sporadic, and because of this decision the problem persisted. After two years of this BS I punted. With three years left in the drivetrain warranty I was covered, but there was no way I would keep that car after five years without an extended warranty.

iclick

This is what I hate about the Corvette experience: Incompetent and/or careless dealers. There are four dealers within about 10 miles of my house, and if I need warranty work on my three-month-old GS I would be hard pressed to pick a dealer among them that I would trust to get the job done without damaging something or otherwise botching the job.

That particular dealer you cite is pathetically clueless and I would suggest going elsewhere. If that's not possible, insist that he read PIP5337E (or whatever the latest revision is, probably "H"), connect the car to a scan tool, and have a tech check it out.

iclick

Of those thousands I would suggest that many of those cars have the problem and the owner doesn't recognize it, or the problem will surface later. In the former example I can easily envision some owners thinking the shudder is caused by road imperfections, and the tach oscillations aren't noticed.

The problem is that many have been "fixed" for a while and the problems re-surface. Some have had their TC changed twice, and there are at least three revisions on the TC. Some 2017 cars are having TC problems, and that suggests to me they haven't gotten a grip on a fix yet, two years after these issues first started showing up.

fnbrowning

Tag for follow-up.

MichaelO

correction

andy21

Just ordered the Range Disabler. Didn't take too long to make that decision. I'll let everyone know what I think once its installed and I've been using it for a bit.

MichaelO

Maxie2U

Nope, not going to happen. The A10 will not fit into the C7 design due to space constraints.

Maxie2U

I disagree, buyers even Corvette buyers don't do a lot "issues" research we read many post that people didn't do basic research when they bought the car.

Foosh

I agree on all counts. I think there are a lot of A8s out there with owners who either don't recognize it as a problem, or are just living with it.

And as we all know, the percentage of garage queens in the Corvette population is staggeringly high.

Kent1999

Which is exactly the progression you would expect, isn't it? As the transmission ages, you get more examples of the problem.

2015's have the most examples of the problem because they are oldest and, on average, have more miles than a 2016.
2016's, on average, have more miles than 2017's, and show more of the issue than 2017's, etc.