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A8 shudder, stutter, warble, rumble strips

 
Old 11-22-2016, 11:41 AM
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joe44va
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Default A8 shudder, stutter, warble, rumble strips

My 2015 Stingray 3LT had been at the dealer since October 18. Got it back last night. They replaced the torque converter after a service engineer came to the dealership and drove it. Works fine now. Service Bulletin 5337F.
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Old 11-22-2016, 09:39 PM
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Please keep us posted periodically and especially after you drive it for a few thousand miles. Very curious if the fix remains the fix.
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Old 11-24-2016, 12:30 PM
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Originally Posted by joe44va View Post
My 2015 Stingray 3LT had been at the dealer since October 18. Got it back last night. They replaced the torque converter after a service engineer came to the dealership and drove it. Works fine now. Service Bulletin 5337F.
what specifically was the bulletin for? My dealership says they have replaced alot of torque converters. Did yours have the warble sound?

Last edited by S'vette; 11-24-2016 at 12:31 PM.
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Old 11-24-2016, 12:41 PM
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No sound, just vibration (stuttering in V4) and some shifting issues.
I never read the actual bulletin but the paperwork they gave me referenced it.
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Old 05-12-2019, 05:51 AM
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Originally Posted by joe44va View Post
My 2015 Stingray 3LT had been at the dealer since October 18. Got it back last night. They replaced the torque converter after a service engineer came to the dealership and drove it. Works fine now. Service Bulletin 5337F.
I was wondering if this was ever an issue after the repair. I just got my 2015 3LT with Z51 and have been able to isolate this issue to the transition between V4 and V8. Seems like it definitely could be this issue after reading the bulletin.

I donít know if the previous owner ever did the Service Bulletin and if not, Iím wondering if it would be covered under my GM extended warranty. Thanks for any insight!

I also found this bulletin which looks like itís from December 2018 and has specific instructions for the tech:
https://www.midenginecorvetteforum.c...ission-shudder

Last edited by Steven Bell; 05-21-2019 at 03:00 PM. Reason: Merged Posts
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Old 05-14-2019, 09:25 AM
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Originally Posted by S'vette View Post
what specifically was the bulletin for? My dealership says they have replaced alot of torque converters. Did yours have the warble sound?
Differential service got rid of the warble noise for me.
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Old 05-19-2019, 12:22 PM
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Originally Posted by Citizenworld View Post
I also found this bulletin which looks like itís from December 2018 and has specific instructions for the tech:
https://www.midenginecorvetteforum.c...ission-shudder
perfect.
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Old 05-19-2019, 07:00 PM
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Do the 2019's have this auto trans. problem too?
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Old 05-19-2019, 08:13 PM
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Originally Posted by gkvetteuno View Post
Do the 2019's have this auto trans. problem too?
The bulletin specifies two models of the A8 transmission (8L45 and 8L90). Iím not sure what years those apply to, but I know it does apply to my 2015 Z51. The OP on the site I linked to mentioned that ď90% of users with A8s donít have yeh issue...Ē which I suppose is good news. Iím going to check in with the dealership this week and see one this applies, specifically with my GM extended warranty.
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Old 05-19-2019, 08:14 PM
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Originally Posted by us3rname View Post
Differential service got rid of the warble noise for me.
Great news!
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Old 05-20-2019, 08:37 PM
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Anyone in norcal recommend a good dealer for this?
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Old 05-21-2019, 09:31 AM
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Quick update that I scheduled the service for tomorrow and upon calling in, they knew exactly what I was talking about. The SA told me that they used the replace the torque converter but were still getting a portion of those customers back with the issue.

They said that now they flush the system with a new formula of transmission fluid and that resolves the issue. This is the solution referenced in the Dec 18 service bulletin I linked to above. I was glad to hear that they recognized this issue immediately over the phone and have a solution.

Iíll report back after I pickup the car and drive it a few hundred miles.

FYI itís Greenacres Chevrolet in Lake Worth, FL. My SA is Mike Fox.
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Old 05-21-2019, 01:14 PM
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Had mine done yesterday, so far the shudder is gone. New SB, same number as the one released in Jan 2019 is now dated March 2019 with no change to the process.

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Old 05-21-2019, 01:31 PM
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Originally Posted by The T-man View Post
Anyone in norcal recommend a good dealer for this?
We'd be happy to confirm the issue and proceed with the repairs if the shudder meets GM's criteria. The newest version of the bulletin requires a snap shot of the data showing the vibration is above a certain threshold. If it is, we're good to go.

With that being said, 80% of the vehicles we road test (Camaro, Corvette, Cadillac, Truck and SUV's) do not meet the minimum threshold to perform the flush. We literally see at least one vehicle per day for this "issue" so it's nothing new to us, but we have to be able to verify (with data) that it's severe enough to warrant repairs. Many of the people coming in have a slight shudder, but they read on the forums about it and more or less just want a free fluid flush.

If the vehicle is under bumper to bumper warranty, GM will pay us the 3/10ths of an hour diagnostic time even if we can't prove the level of shudder is above GM's limit. If the car is outside the 3/36 bumper to bumper, GM does not allow us to submit the diagnostic time if the car is not severe enough so that time is the customer's responsibility. If the shudder is excessive and we can obtain the snap shot, all costs are paid by GM and the customer is not responsible for anything.
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Old 05-21-2019, 02:10 PM
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Originally Posted by RichieRichZ06 View Post
We'd be happy to confirm the issue and proceed with the repairs if the shudder meets GM's criteria. The newest version of the bulletin requires a snap shot of the data showing the vibration is above a certain threshold. If it is, we're good to go.

With that being said, 80% of the vehicles we road test (Camaro, Corvette, Cadillac, Truck and SUV's) do not meet the minimum threshold to perform the flush. We literally see at least one vehicle per day for this "issue" so it's nothing new to us, but we have to be able to verify (with data) that it's severe enough to warrant repairs. Many of the people coming in have a slight shudder, but they read on the forums about it and more or less just want a free fluid flush.

If the vehicle is under bumper to bumper warranty, GM will pay us the 3/10ths of an hour diagnostic time even if we can't prove the level of shudder is above GM's limit. If the car is outside the 3/36 bumper to bumper, GM does not allow us to submit the diagnostic time if the car is not severe enough so that time is the customer's responsibility. If the shudder is excessive and we can obtain the snap shot, all costs are paid by GM and the customer is not responsible for anything.
Thanks, this is helpful.

Originally Posted by Ammo View Post

Had mine done yesterday, so far the shudder is gone. New SB, same number as the one released in Jan 2019 is now dated March 2019 with no change to the process.
How long did the service take start to finish?

Last edited by Steven Bell; 05-21-2019 at 03:02 PM. Reason: Merged Posts
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Old 05-22-2019, 10:35 PM
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2 to 3 hours, I’m not sure, was not in a hurry, just wanted it done right.
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Old 05-23-2019, 01:08 AM
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http://gmauthority.com/blog/2019/04/...ission-defect/

GM Hit With Class-Action Lawsuit Over 8-Speed Transmission Defect
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Old 05-26-2019, 01:14 AM
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Originally Posted by 06MonteSS View Post
http://gmauthority.com/blog/2019/04/...ission-defect/

GM Hit With Class-Action Lawsuit Over 8-Speed Transmission Defect
Interesting - thanks for sharing!
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Old 05-26-2019, 02:10 AM
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I am pleased to report that after the service on Wednesday, Iíve driven ~150 miles and itís like a completely different car! Not only is the shudder problem gone, but my shifts in M mode are completely smooth as are general shifts in automatic. This is specifically evident in Touring mode where I had just assumed since getting the car that it was jerky in Touring mode all the time.

Iíve also noticed less of a lag in shifting between reverse and drive, and no shaking/shudder when switching between V4 and V8.

The service took a full day.
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