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A8 Transmission failure tracking

Old 06-09-2017, 03:36 PM
  #21  
newskatercat
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Sadly the problem still exists in 2017.
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Old 06-09-2017, 04:25 PM
  #22  
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I updated the Model column (Z06) I have about 6200 miles with no issues. I drive the car in auto mode and paddle shift mode depending on the type of driving I am doing. If in auto mode I will down shift with the paddles when going into a tight curve to hold the gear I want through the curve. Again no issues with any modes. When driving in traffic going up a steep grade (mountain driving) I use paddle shift mode to keep the transmission from searching for the right gear depending on load. I would say this is the biggest problem with the A8 for me personally...But can be avoided if you use the paddles.
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Old 06-09-2017, 04:47 PM
  #23  
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I also updated the model and added a comment in the "No Failure" cell indicating that I'm currently at 12.7K miles error free. Current Mileage might also be helpful for those that aren't seeing any problems.
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Old 06-09-2017, 04:52 PM
  #24  
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Should there be a choice for shudder and if the transmission fluid triple flush fixed it or not? That's the problem I have and it goes in next Friday to see what they say about it. I don't guess it's a failure, but man is it annoying!
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Old 06-09-2017, 04:52 PM
  #25  
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2016 Z51 Convertible 4,800 miles no failure stills works great
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Old 06-09-2017, 05:07 PM
  #26  
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2015 Z51 A8 11,800 miles still runs fantastic.
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Old 06-09-2017, 05:08 PM
  #27  
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I would suggest that rather than posting, "mine's great" or "mine sucks," just update your info in the OP's spreadsheet. If you're not there, add yourself.

We don't need to go through endless posts here as we have in the past. The only interest here is in a large data pool, not individual testimonials.

Last edited by Foosh; 06-09-2017 at 05:09 PM.
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Old 06-09-2017, 06:36 PM
  #28  
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I agree Foosh, but I think if there was a column for current mileage with NO problems it would be helpful. This is what people are adding in these recent posts. Along with those additional comments.....
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Old 06-09-2017, 06:41 PM
  #29  
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Originally Posted by OzarkCorvetteGuy View Post
I'm on an iPad and looks like it's prompting me to download an app to respond to the spreadsheet. I doubt I'll do that so I'll just add that I've got a 2015 with 7,800 miles A8 and when it's cold I always use paddles till it warms up but no failure yet.
It's Google Sheets. You want that app no matter anyway.
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Old 06-09-2017, 09:05 PM
  #30  
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Updated mine at 4K miles to TC replacement (preventative: shudder/150rpm fluctuation in V4) at 6K miles. Replaced/fluid flush. Currently 10K miles, 30rpm fluctuation and no shudder in V4.
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Old 06-09-2017, 11:12 PM
  #31  
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Originally Posted by \Boost Monkey/ View Post
FYI iclick, an o-ring issue is not necessarily the problem with the delayed engagement.
Okay. At some point in my two-year A8 tribulation I recall mention of defective or missing o-ring(s) being a factor in the delayed engagement issues, but the doc cited earlier doesn't corroborate that.

I'll hold off on reporting that in case a change is made to the structure. It would also be good to have a way to report repair dates and part numbers. I think the latter is important because there have been so many revisions on the TC, and I would like to know if the newest one or the flush-only procedure has had any failures.

Last edited by iclick; 06-09-2017 at 11:16 PM.
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Old 06-10-2017, 12:04 AM
  #32  
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I must have made the Corvette gods happy in some way. Over 25k on my bought in Aug '16 Z and no issues.
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Old 06-10-2017, 02:35 AM
  #33  
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Is there a list of definitive dates for the new Torque converter or transmission and fluid revisions? If build date and current mileage was added to the spreadsheet, it might provide helpful info.
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Old 06-10-2017, 02:46 AM
  #34  
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I've been gone all day, lots of activity and comments to go thorough. I'll do that tomorrow and make some changes to the spreadsheet as there are some great suggestions that will make this more helpful. Stay tuned!

Last edited by mountainears; 06-10-2017 at 11:36 AM.
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Old 06-10-2017, 09:33 AM
  #35  
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Originally Posted by STINGmole View Post
Is there a list of definitive dates for the new Torque converter or transmission and fluid revisions? If build date and current mileage was added to the spreadsheet, it might provide helpful info.
I can only tell you that the TC Rev. 3 (#24280631) was available in Dec. 2016, as that was when I first brought my car in for service where this was verified. Some early 2017 cars had the Rev. 2 TC (#24279495) and some of them have already reported problems. My 2015 car (built 12/16/14) had #24273061. I don't know how many times they've revised the fluid, but the new fluid is Mobil 1 HD Low-Viscosity ATF #19353429, or at least that is what was used in my car in early Feb. 2017 for its TC/fluid job.

Last edited by iclick; 06-10-2017 at 09:34 AM.
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Old 06-10-2017, 11:36 AM
  #36  
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OK, I made some changes to the spreadsheet and I'm starting to go through all the comments and the PM's I have. Some folks can't update the sheet themselves, I will do those updates for those that have sent me messages (hopefully today).

In order for the charts to work, in some cases you have to enter the data in the exact choices that I give you in the drop down lists in each cell or use dates formatted the right way, etc.

I've highlighted a couple cells in yellow, if you see that, please correct.

In some cases this may be difficult. For example, HISVETTE put in Re-Flash Trans 3 times in the Failure column. That needs to be either No Failure, Torque Converter or Transmission.

The assumption here is that if you had an issue, something was done (torque converter replacement / flush or transmission work) so there was an identified failure component by the servicing department.

I know there is a warble / shudder issue as well going on and in that case it seems to be rear-end related. I haven't added that to this sheet, but I guess I can. I thought I would initially focus though on transmission related failures, not necessarily issues in general. So for now, if you have not had a transmission or torque converter issue, say no failure.
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Old 06-10-2017, 12:25 PM
  #37  
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Originally Posted by NSC5 View Post
You might also consider including engine type (LT1 or LT4) since the torque converter failures aren't showing up in quantity in the Z06 forum.
I've added a column for model, that should give us essentially that info. Thanks!

Originally Posted by iclick View Post
Yes, good idea. I showed "Date of Failure" as the date in shop, not when first symptom noticed. Symptoms were sporadic at first, then in Nov. 2016 started to get worse and could be demonstrated at any time.
I've added some additional date/mileage columns. Failure, Repair and Current.
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Old 06-10-2017, 12:26 PM
  #38  
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No worries, I have you updated.
What model is yours and I'll update that as well.

Originally Posted by OzarkCorvetteGuy View Post
I'm on an iPad and looks like it's prompting me to download an app to respond to the spreadsheet. I doubt I'll do that so I'll just add that I've got a 2015 with 7,800 miles A8 and when it's cold I always use paddles till it warms up but no failure yet.
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Old 06-10-2017, 12:32 PM
  #39  
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Originally Posted by \Boost Monkey/ View Post
There needs to be the following change to the overall structure IMHO:

1. Failure is a strong word, and can be interpreted quite differently. For example, some may interpret as a complete replacement of the Torque converter or transmission. I would reword to "Issue'' or "problem", and define as a dealer acknowledged issue, not just "i think there is an issue".

2. Although my TC is failing as well, my main issue at this current moment is the delayed engagement as mentioned above. It's hard to classify as a failure of either as the exact issue has not even been identified by GM yet (the current fixes do not work). At best it's an issue related to the transmission, not the TC as previously thought by the braintrust.
I was starting with the poll data of course to get some sort of graphing out of the results. And with that my "assumptions" going into this are that there hadn't been an issue, or there was and now it's been resolved by either servicing the torque converter or the transmission.

For those that have an issue but have not serviced it yet, or it's in process, etc., the format doesn't really work. But this is looking at it more as a problem resolution tracking as opposed to a symptom / issue tracking.

The data has to be normalized in some way, especially with having mass amounts of people all updating this sheet, so there is some consistency in the results. Tried to do this a little by narrowing choices with drop downs.

Open to suggestions on how to modify the structure to help capture this. I was thinking about adding to the "Failure" column other choices like "X Issue - not resolved" where X could be "shudder, warble, or whatever number of options". But we'd need to define what those are so it could be charted.

Not sure, throwing out ideas.
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Old 06-10-2017, 12:33 PM
  #40  
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Originally Posted by newskatercat View Post
Sadly the problem still exists in 2017.
Sounds like it, but from the charting at least it is at a much lower frequency. So one could conclude that things are better, but of course it is far from comprehensive data :-)
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