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A8 Transmission failure tracking

 
Old 06-13-2019, 11:39 AM
  #1201  
faninc
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Default Thanks for sharing

Can someone share and describe the shutter on A8? What speed and was is feeling encountered? Why do some A8 do this many do not? I have not had the feeling as far as I can tell. Thanks!!
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Old 06-13-2019, 11:58 AM
  #1202  
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Originally Posted by faninc View Post
Can someone share and describe the shutter on A8? What speed and was is feeling encountered? Why do some A8 do this many do not? I have not had the feeling as far as I can tell. Thanks!!
It is a shake or shudder feel. Something like going over rumble strips. It usually occurs giving light throttle acceleration between 25 and 80 mph. It will vary a little between each car with the affliction.
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Old 06-13-2019, 11:59 AM
  #1203  
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Originally Posted by faninc View Post
Can someone share and describe the shutter on A8? What speed and was is feeling encountered? Why do some A8 do this many do not? I have not had the feeling as far as I can tell. Thanks!!
For mine, even if you didnít know this problem existed you still would have thought something was up with the trans. Hard shifts, lurching, when maintaining constant speeds at roughly 40-60ish it would feel like going over tiny speed bumps at times.
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Old 06-14-2019, 08:42 AM
  #1204  
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Default Is it the V4 to V8 AFM affecting?

Hi,

Could it be the AFM switching in and out of 4 and 8 cylinder? Using Range and not having issue? Also interesting if it is a common defect why every A8 owner is not experiencing this issue. They all have same internals and same factory fluid?
How is it GM did not load up 2019 A8 with new fluid from the factory given known problem? They will pay more under warranty repairs and fluid swaps?
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Old 06-14-2019, 01:30 PM
  #1205  
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Originally Posted by faninc View Post
Hi,

Could it be the AFM switching in and out of 4 and 8 cylinder? Using Range and not having issue? Also interesting if it is a common defect why every A8 owner is not experiencing this issue. They all have same internals and same factory fluid?
How is it GM did not load up 2019 A8 with new fluid from the factory given known problem? They will pay more under warranty repairs and fluid swaps?
I believe that they started the latest and greatest fluid on the new ones in February some time.
I could never understand why some fail and most don't. It is the same parts. Even though the torque converters have three different parts numbers, my understanding is they are all the same. The reason for the different parts number is because of different manufacturing lots. They ran several batches of them for extended periods of time. And then when they started to manufacture more at a later date the just gave them a different lot and batch number.
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Old 06-21-2019, 04:51 PM
  #1206  
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My 2015 has 30,000 miles now and I have had many of the A8 problems reported. It looks like there are more the one reason for these failures. I live near Hilo Hawaii. Our Chevy dealer does not sell or work on Corvettes so I have had to work around the fix's myself. The best fix I have found was to reprogram the computer.
I turned off the fuel management control. That stopped the shuddering and the tranny worked well for a year or so. Then the slow to engage popped up. I found this only happened when it was cold or the car had not used for awhile. If the car was warmed up for a few minuets, it worked. Only one more year on the warranty. I was hoping that there would be a recall on these transmissions. I have owned nine Corvettes over the last 45 years and this is the first one that I have not been able to repair myself.

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Old 06-24-2019, 11:11 PM
  #1207  
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Originally Posted by colin mciver View Post
My 2015 has 30,000 miles now and I have had many of the A8 problems reported. It looks like there are more the one reason for these failures. I live near Hilo Hawaii. Our Chevy dealer does not sell or work on Corvettes so I have had to work around the fix's myself. The best fix I have found was to reprogram the computer.
I turned off the fuel management control. That stopped the shuddering and the tranny worked well for a year or so. Then the slow to engage popped up. I found this only happened when it was cold or the car had not used for awhile. If the car was warmed up for a few minuets, it worked. Only one more year on the warranty. I was hoping that there would be a recall on these transmissions. I have owned nine Corvettes over the last 45 years and this is the first one that I have not been able to repair myself.
Sorry for your troubles, I like your dog though! Have a red one myself (albeit not the hand held version).
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Old 07-17-2019, 05:10 PM
  #1208  
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So my recently purchased 2015 has the dreaded shudder. I bring it to my local chevy dealer who did everything but help. I asked about the triple flush and their faces looked like deer in headlights. When I asked about getting it done on a Saturday since it is my daily driver they said they don't have the update fluid. I asked them to call me( the adviser knows me because there aren't too many Yellow Corvettes that come rolling thru. Bottom line is they were of no help and I have yet to hear back. This past Friday I called the dealer that I bought the car from, Rick Hendrick in Duluth Ga. They not only got back to me but learned that my transmission was replaced 2 years ago in 2017. They told me to bring it in Saturday after next, drop it off and they will give me a loaner. Now THAT'S service. It also explains why they are #6 on the allocation list for the C8. The local dealer is John Miles. Unless your Malibu or Impala needs an oil change I would steer clear of them for Vette work. They even tried to bill me for the gas leak TSB.

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Old 07-17-2019, 06:07 PM
  #1209  
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Default A8 Shudder

2015 Z51 with 11,500 miles that developed significant shudder especially at speeds between 60 to 70 mph. Brought to dealership (MacMulkin) who diagnosed the problem and performed transmission triple flush at no cost. 40 mile ride home without further problem.
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Old 07-17-2019, 06:55 PM
  #1210  
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Originally Posted by [email protected] View Post
2015 Z51 with 11,500 miles that developed significant shudder especially at speeds between 60 to 70 mph. Brought to dealership (MacMulkin) who diagnosed the problem and performed transmission triple flush at no cost. 40 mile ride home without further problem.
I am hoping that's all mine needs.....
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Old 07-17-2019, 07:55 PM
  #1211  
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Default Carfax

Did the carfax report not pick up the dealer replacing the transmission ?
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Old 07-18-2019, 07:11 AM
  #1212  
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I found the information below in red on another forum and it states that TSB 18-NA-355 was updated again in July 2019. They will no longer require a pico test to confirm the shudder but they will only allow one flush per car. (see below)

18-NA-355 and 19-NA-121 have been updated effective July 9, 2019 to eliminate the diagnostics portion within the TSB's and the labor times have been updated to reflect the removal of the diagnostic procedures. Vehicles presented with suspected shudder within the published build dates should have the prescribed fluid exchange procedure performed. The fluid exchange procedure has been very effective at permanently eliminating Torque Converter Shudder.

The published labor operations will pay once per VIN as the fluid exchange has been very effective at permanently at eliminating shudder. Any vehicle that returns with suspect shudder should be diagnosed utilizing using published diagnostics, GDS, PICO Scope or other diagnostic tools. Sometimes shudder is not caused by the torque converter clutch (TCC). In some instances, shudder is fish bite, chuggle, surge or vibration. We have seen cases of suspected TCC shudder turn out to be engine performance, tire/wheel vibration or a driveline vibration.
Thank you for your cooperation.


I couldn't find a copy of the complete TSB from July 2019 but I did find a copy of the TSB updated in May 2019 that I have attached. It shows on the May 2019 update that all Corvettes built after February 1st, 2019 had the new style fluid installed at the factory.
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File Type: pdf
TSB 18 NA 355 May 2019.pdf (4.02 MB, 12 views)

Last edited by MA ZO6; Yesterday at 08:04 AM.
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Old 07-18-2019, 07:52 AM
  #1213  
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Sometimes "bean counting" works in the favor of the customer. I view this as GM accepting this problem is so widespread that extensive diagnostics are a waste of time and GM money, sort of like running an EKG on a corpse covered with flies and buzzards..
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Old 07-18-2019, 12:59 PM
  #1214  
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^^^ Read the above while eating lunch.
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Old 07-18-2019, 01:35 PM
  #1215  
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Originally Posted by MikeyTX View Post
^^^ Read the above while eating lunch.
Sorry Mikey... but you can thank me later for helping with your new diet plan

That image came to mind because a few days ago I went for a 6 mile run in the heat and when I got home there was a Turkey Vulture perched on the barn. I am not sure if it was a comment on my aroma after running or if he expected me to soon be on his menu from running in the high heat and humidity.
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Old 07-18-2019, 04:00 PM
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Great info and the recognition that they think "the fix" works. Given that they apparently are willing to flush 100% of the A8s once and be done with it. I am in for an oil change on the Corvette next week. I will add the flush to the work order and likely will take the ATS-V in for OIl in a month or two and will do the same thing then. And apparently after that the "shudder" will be a problem of the past. Really appreciate this update.
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Old 07-18-2019, 07:02 PM
  #1217  
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Originally Posted by NSC5 View Post
Sorry Mikey... but you can thank me later for helping with your new diet plan

That image came to mind because a few days ago I went for a 6 mile run in the heat and when I got home there was a Turkey Vulture perched on the barn. I am not sure if it was a comment on my aroma after running or if he expected me to soon be on his menu from running in the high heat and humidity.
..........
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Old 07-18-2019, 07:35 PM
  #1218  
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Originally Posted by faninc View Post
Did the carfax report not pick up the dealer replacing the transmission ?
Buyer beware...It did but I didn't read it before buying........
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