What is TSB for A8 transmission shudder?
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Sep 18, 2019, 02:45 PM
Advanced
Joined: Aug 2015
Posts: 97
Likes: 77
From: Mineola, NY
The latest TSB 18NA355 revised July 29,2019
Race Director
Joined: Apr 2017
Posts: 13,602
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From: Virginia
Burning Brakes
Joined: Apr 2004
Posts: 1,029
Likes: 114
From: Sarasota FL
St. Jude Donor '13
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.
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.
Safety Car
Joined: Dec 2017
Posts: 3,532
Likes: 2,060
From: Columbus Ohio
I had mine performed last fall, but as we know, there is now a better, non-hydroscopic, fluid - Mobile 1 Synthetic - recommended (that I didn't get).
Since I have already had the TC service, am I now required to pay if I want the old (last fall) fluid drained and replaced with the Mobile 1?
Seems like it should still be covered under warranty or a recall.
Since I have already had the TC service, am I now required to pay if I want the old (last fall) fluid drained and replaced with the Mobile 1?
Seems like it should still be covered under warranty or a recall.
Racer
Joined: Nov 2008
Posts: 276
Likes: 76
From: Florida
I had mine performed last fall, but as we know, there is now a better, non-hydroscopic, fluid - Mobile 1 Synthetic - recommended (that I didn't get).
Since I have already had the TC service, am I now required to pay if I want the old (last fall) fluid drained and replaced with the Mobile 1?
Seems like it should still be covered under warranty or a recall.
Since I have already had the TC service, am I now required to pay if I want the old (last fall) fluid drained and replaced with the Mobile 1?
Seems like it should still be covered under warranty or a recall.
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From: NJ
i just had my car done and i had it done last year with the older fluid.. no issues all warranty.
on a side note, i always tip the service manager, service writer (if i end up dealing with them instead) and the Tech.. i HOPE you guys are doing this... "grease" keeps the machine running smoothly lol.. I have the service manager's and tech's cell phone number.. like i said, we pay a lot of money for these cars, the people that fix and watch over them should have that extra incentive to care for them like they're their own...
As for the new fluid? with the LAST fluid change i didn't notice a shudder but figured might as well have the newest CORRECT fluid put in.
on a side note, i always tip the service manager, service writer (if i end up dealing with them instead) and the Tech.. i HOPE you guys are doing this... "grease" keeps the machine running smoothly lol.. I have the service manager's and tech's cell phone number.. like i said, we pay a lot of money for these cars, the people that fix and watch over them should have that extra incentive to care for them like they're their own...
As for the new fluid? with the LAST fluid change i didn't notice a shudder but figured might as well have the newest CORRECT fluid put in.
Last edited by 24/Eray; Jul 31, 2019 at 09:47 AM.
Safety Car
Joined: Jun 2003
Posts: 4,250
Likes: 656
From: San Diego Ca
I don't have a copy of the revised TSB, but did mention it to my Service Writer and he confirmed it, ordered the new correct fluid and it was done yesterday. I do feel for the folks that had it done last year with the old fluid. Hopefully GM will allow one flush with the corrected fluid per car. But I suppose that is yet to be determined. Keep us posted on that those of you that had it done before the new fluid came out.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,865
From: Virginia
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.
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.
Drifting
Joined: Apr 2013
Posts: 1,743
Likes: 453
From: Saint Clair Shores Mi
i just had my car done and i had it done last year with the older fluid.. no issues all warranty.
on a side note, i always tip the service manager, service writer (if i end up dealing with them instead) and the Tech.. i HOPE you guys are doing this... "grease" keeps the machine running smoothly lol.. I have the service manager's and tech's cell phone number.. like i said, we pay a lot of money for these cars, the people that fix and watch over them should have that extra incentive to care for them like they're their own...
As for the new fluid? with the LAST fluid change i didn't notice a shudder but figured might as well have the newest CORRECT fluid put in.
on a side note, i always tip the service manager, service writer (if i end up dealing with them instead) and the Tech.. i HOPE you guys are doing this... "grease" keeps the machine running smoothly lol.. I have the service manager's and tech's cell phone number.. like i said, we pay a lot of money for these cars, the people that fix and watch over them should have that extra incentive to care for them like they're their own...
As for the new fluid? with the LAST fluid change i didn't notice a shudder but figured might as well have the newest CORRECT fluid put in.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,865
From: Virginia
i just had my car done and i had it done last year with the older fluid.. no issues all warranty.
on a side note, i always tip the service manager, service writer (if i end up dealing with them instead) and the Tech.. i HOPE you guys are doing this... "grease" keeps the machine running smoothly lol.. I have the service manager's and tech's cell phone number.. like i said, we pay a lot of money for these cars, the people that fix and watch over them should have that extra incentive to care for them like they're their own...
As for the new fluid? with the LAST fluid change i didn't notice a shudder but figured might as well have the newest CORRECT fluid put in.
on a side note, i always tip the service manager, service writer (if i end up dealing with them instead) and the Tech.. i HOPE you guys are doing this... "grease" keeps the machine running smoothly lol.. I have the service manager's and tech's cell phone number.. like i said, we pay a lot of money for these cars, the people that fix and watch over them should have that extra incentive to care for them like they're their own...
As for the new fluid? with the LAST fluid change i didn't notice a shudder but figured might as well have the newest CORRECT fluid put in.
Waiters/waitresses/valet attendants etc wages in most cases are based on their income being greatly supplemented by tips. However this is not the case for service writers, service managers and even techs who are typically fully compensated for the work they do or are supposed to be doing.
Like I said, I will tip a tech/SM/SW it they go above and beyond for me, however I won't just tip for normal service that I should be receiving as a paying customer. Experience has taught me that too casual tipping practices results too often in tips being expected and can lead to a negative impact on service received.
Instructor
Joined: Sep 2016
Posts: 176
Likes: 43
Trying dealership roulette and seeing if other dealerships have a different stance - but I'm worried that if they're unable to replicate the problem, they won't do it: Did Chevy change their stance to not do the PICO test first now?
Last edited by ensignlee; Jul 31, 2019 at 10:14 PM.
Drifting
Joined: Apr 2013
Posts: 1,743
Likes: 453
From: Saint Clair Shores Mi
I consider myself good tipper for services that are typically tipped, restaurant staff for example. However, I have mixed-feelings on the non-typically tip thing in general, however have/will give an unexpected tip for service above and beyond.
Waiters/waitresses/valet attendants etc wages in most cases are based on their income being greatly supplemented by tips. However this is not the case for service writers, service managers and even techs who are typically fully compensated for the work they do or are supposed to be doing.
Like I said, I will tip a tech/SM/SW it they go above and beyond for me, however I won't just tip for normal service that I should be receiving as a paying customer. Experience has taught me that too casual tipping practices results too often in tips being expected and can lead to a negative impact on service received.
Waiters/waitresses/valet attendants etc wages in most cases are based on their income being greatly supplemented by tips. However this is not the case for service writers, service managers and even techs who are typically fully compensated for the work they do or are supposed to be doing.
Like I said, I will tip a tech/SM/SW it they go above and beyond for me, however I won't just tip for normal service that I should be receiving as a paying customer. Experience has taught me that too casual tipping practices results too often in tips being expected and can lead to a negative impact on service received.
Race Director
Joined: Sep 2011
Posts: 10,742
Likes: 211
From: Marana, Arizona
I just got off the phone talking to a Chevrolet Customer Service rep and then her supervisor. My local dealer insists they need to do a diagnostic at a cost of $147 to confirm the issue before they will do the flush under warranty. I read to them - from the August TSB - "Vehicles that are presented with TCC shudder should have the appropriate fluid exchange procedure completed. Diagnosis beyond the customer compliant is not required". Customer service still insists the diagnostic needs to be done first. Any recommendations as to where to go next? TIA