A8 shudder update
The following 2 users liked this post by pkincy:
joemessman (11-22-2018),
Nghia Vu (11-21-2018)
11-21-2018, 09:57 PM
#62
It depends on how bad the problem is. Generally, they will go for the triple flush first and see if it cures it. That's what we did with mine but it didn't fix the problem. I went back to them with a complete written description of what was happening along with a copy of the TSB that describes the conditions for the TC change and exactly what the procedure is. I made sure the tech got all of the paperwork and my description of the problem. Let them do the triple flush and see what happens. If it comes back, do as I advised above. It's more of a situation of telling them what they have to do as opposed to asking them.
How many miles on the car? What year is it? Did you get it from the dealer that's servicing it?
How many miles on the car? What year is it? Did you get it from the dealer that's servicing it?
11-21-2018, 10:05 PM
#63
Pro
Mine was serviced by my local dealer (I bought the car from out of state). Yours is still under the B to B warranty so there should be no issue. As noted in a previous post, the TSB was updated on 10/18/18 and the triple flush is no longer done. They will do a flush and clean filter but “the fix” is supposed to arrive the 1st quarter of 2019.
11-21-2018, 10:09 PM
#64
Pro
In accordance with the TSB, they will drive the vehicle to determine if the condition exists. The new TSB says to NOT change the TC so it will not be changed because you requested it. The dealer will follow the latest TSB (10/18/18) and do as it directs.
11-21-2018, 10:26 PM
#65
It depends on how bad the problem is. Generally, they will go for the triple flush first and see if it cures it. That's what we did with mine but it didn't fix the problem. I went back to them with a complete written description of what was happening along with a copy of the TSB that describes the conditions for the TC change and exactly what the procedure is. I made sure the tech got all of the paperwork and my description of the problem. Let them do the triple flush and see what happens. If it comes back, do as I advised above. It's more of a situation of telling them what they have to do as opposed to asking them.
How many miles on the car? What year is it? Did you get it from the dealer that's servicing it?
How many miles on the car? What year is it? Did you get it from the dealer that's servicing it?
11-21-2018, 10:47 PM
#66
Burning Brakes
Thread Starter
The following users liked this post:
MMD (11-21-2018)
11-21-2018, 11:17 PM
#67
If Mode B Result is:
Vibration Shudder is Present with TCC Disabled
and Mode C Result is:
or Vibration Shudder is Present with TCC Enabled
Then the Shudder root cause is not TCC related.
The TSB offers "No Proposed solution" by GM. <-- my words here.
also what is interesting about this TSB is it is to be conducted in V4 ECO Mode only per TSB.
11-21-2018, 11:48 PM
#68
Burning Brakes
Thread Starter
If you read through yhis TSB carefully, you can read between thelines and see that while the techs conduct the pico scope test that if both Test Mode B & C produce the following test results then this TSB does not offer any recommendations for proceeding with any type of fix. One can assume the unwritten recommendation would be to replace the torque converter as others have reported having done.
If Mode B Result is:
Vibration Shudder is Present with TCC Disabled
and Mode C Result is:
or Vibration Shudder is Present with TCC Enabled
Then the Shudder root cause is not TCC related.
The TSB offers "No Proposed solution" by GM. <-- my words here.
also what is interesting about this TSB is it is to be conducted in V4 ECO Mode only per TSB.
11-22-2018, 12:03 AM
#69
Interesting that the test should only be in V4 and that sort of directly links the problem to the AFM system that a lot of us have concluded, hence the addition of a Range module. BTW, I had my TC replaced under warranty just two weeks ago for the problem and the dealer didn't put up any resistance to it. Shudder is now gone and the range module is in...permanently.
11-22-2018, 08:27 AM
#70
Burning Brakes
Thread Starter
It is my understanding that any replacement of the torque converter would have been approved by GM's engineers. This tells me your TC replacement was due to some other source than the TCC related shudder. It still could be related to the AFM though. Please keep us up-to-date with your new TC. Hope things work out.
11-22-2018, 11:16 AM
#71
I am scheduled to bring my ride in Monday and was informed it takes about 4 hours. What's the MRC update?
The following users liked this post:
bringe (01-17-2019)
11-22-2018, 11:35 AM
#72
Burning Brakes
Thread Starter
Magnetic Ride Control. It's a software upgrade to give a noticeable change in ride quality and handling. It's initially sort of deceiving because it takes some time and about 200 miles of driving for it to be fully functional but all of a sudden you become aware of a much more civilized driving experience. Well worth the 350 bucks IMO.
11-22-2018, 11:39 AM
#73
The changes for various C7 Corvettes are as follows:
2014-16 Stingray with Z51 features new calibrations in Tour and Sport modes.
2016 Stingray (non-Z51) features new calibrations in Tour, Sport and Track modes.
2015-16 Z06 (non-Z07) features new calibrations in Tour, Sport and Track modes.
2015-16 Z06 with Z07 Performance Package features new calibrations in Tour, Sport and Track modes.
During testing for the new calibrations, Chevy said the 2016 C7 Corvette Z06 lapped the Milford Road Course one second quicker than before the calibrations. The calibrations will cost $350 and require no hardware changes. The calibration is a simple upload to the vehicle that dealers can perform with no effect on the factory warranty.
12-31-2018, 09:29 PM
#74
Safety Car
We have seen the 10/11/18 update to TSB 16-NA-175. On the CTS-V forum a post was made referencing a Dec TSB for the 8L90 shudder 18-NA-355. It wasn't posted. If anyone could access it and post the pdf it would be appreciated. Supposedly a new fluid to be available shortly. I presume it will be for all A8s or at least for all the 8L90s.
01-01-2019, 03:54 AM
#75
Le Mans Master
Member Since: Nov 2015
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We have seen the 10/11/18 update to TSB 16-NA-175. On the CTS-V forum a post was made referencing a Dec TSB for the 8L90 shudder 18-NA-355. It wasn't posted. If anyone could access it and post the pdf it would be appreciated. Supposedly a new fluid to be available shortly. I presume it will be for all A8s or at least for all the 8L90s.
01-01-2019, 11:23 AM
#76
Safety Car
As I stated that we have. Has anyone been able to get the new one?? 18-NA-355. The one you have was first published in 2016 and is 16-NA-175 as updated on Oct 11, 2018. The new one was published 12-12-18.
Last edited by pkincy; 01-04-2019 at 01:35 AM.
01-16-2019, 07:13 PM
#77
Safety Car
Not the new TSB, but this is the announcement it is coming.
Originally posted by GM Technical Assistance Center
8 Speed Torque Converter Shudder – New Service Procedure and New Mobil 1 Synthetic LV ATF HP Fluid Regional Rollout
GM CUSTOMER CARE & AFTERSALES
URGENT - DISTRIBUTE IMMEDIATELYDATE12/12/2018SUBJECT8 Speed Torque Converter Shudder – New Service Procedure and New Mobil 1 Synthetic LV ATF HP Fluid Regional RolloutMODELS8L45 and 8L90 ApplicationsTOAll Cadillac, Chevrolet and GMC DealersATTNService Manager, Service Director, Shop Foreman, Service Technician, Parts Manager, Parts Counter Personnel, Warranty Administrator, General Manager
A new transmission fluid exchange procedure and new formula of Mobil 1 Synthetic LV ATF HP transmission fluid is being released to address torque converter shudder on 8L45 and 8L90 applications. The procedure and new transmission fluid is being rolled out regionally due to the limited availability of both the new transmission fluid and tool kit availability. The dealer rollout was determined by paid warranty claims from TSB 16-NA-175. It is anticipated that the new transmission fluid and tool kit will be available nationwide by late January or early February 2019. Once the new transmission fluid and tool kit is available the detailed service procedure will be loaded into GM Service Information (SI) as a Technical Service Bulletin (TSB). TSB's 16-NA-175 and 18-NA-177 will be eliminated from SI. An additional Global Connect Message will be sent to announce these changes.
Selected dealers will receive a separate Global Connect Message this week advising how to obtain the new Mobil 1 Synthetic LV ATF HP transmission fluid, delivery of the no charge tool kit from Bosch and detailed service procedure.
The new fluid exchange procedure will require the use of the existing DT-45096 TransFlow machine and tool kit. The tool kit will ship from Bosch at no charge.
The December 2018 Emerging Issues Broadcast, course number 10218.12V will be available through the Center of Learning on Thursday, December 13. The broadcast contains a video demonstrating the procedure on a Chevrolet Colorado and details on the new Mobil 1 Synthetic LV ATF HP transmission fluid.
The detailed service procedure may seem complicated at first review. However, we are confident that once you've completed the procedure you will find it relatively easy.
Proper Diagnosis: Sometimes shudder is not caused by the torque converter clutch (TCC). In some instances, shudder is fish bite, chuggle, surge or vibration. Utilizing the GDS and or the PICO Scope will help confirm the issue is TCC shudder. We have seen cases of suspected TCC shudder turn out to be engine performance, tire/wheel vibration or a driveline vibration.
Please do not contact the Technical Assistance Center (TAC) seeking information on when the new Mobil 1 Synthetic LV ATF HP transmission fluid and tool kit will be available nationwide. TAC does not have any additional information.
For those dealers that are not among the initial selected group. Please continue to follow 16-NA-175 and 18-NA-177 until the new service procedure is available nationwide. We are working diligently to get the new service solution available to all dealers and will advise through an additional Global Connect message once available.
Thank you for your cooperation.
GM CUSTOMER CARE & AFTERSALES
Originally posted by GM Technical Assistance Center
8 Speed Torque Converter Shudder – New Service Procedure and New Mobil 1 Synthetic LV ATF HP Fluid Regional Rollout
GM CUSTOMER CARE & AFTERSALES
URGENT - DISTRIBUTE IMMEDIATELYDATE12/12/2018SUBJECT8 Speed Torque Converter Shudder – New Service Procedure and New Mobil 1 Synthetic LV ATF HP Fluid Regional RolloutMODELS8L45 and 8L90 ApplicationsTOAll Cadillac, Chevrolet and GMC DealersATTNService Manager, Service Director, Shop Foreman, Service Technician, Parts Manager, Parts Counter Personnel, Warranty Administrator, General Manager
A new transmission fluid exchange procedure and new formula of Mobil 1 Synthetic LV ATF HP transmission fluid is being released to address torque converter shudder on 8L45 and 8L90 applications. The procedure and new transmission fluid is being rolled out regionally due to the limited availability of both the new transmission fluid and tool kit availability. The dealer rollout was determined by paid warranty claims from TSB 16-NA-175. It is anticipated that the new transmission fluid and tool kit will be available nationwide by late January or early February 2019. Once the new transmission fluid and tool kit is available the detailed service procedure will be loaded into GM Service Information (SI) as a Technical Service Bulletin (TSB). TSB's 16-NA-175 and 18-NA-177 will be eliminated from SI. An additional Global Connect Message will be sent to announce these changes.
Selected dealers will receive a separate Global Connect Message this week advising how to obtain the new Mobil 1 Synthetic LV ATF HP transmission fluid, delivery of the no charge tool kit from Bosch and detailed service procedure.
The new fluid exchange procedure will require the use of the existing DT-45096 TransFlow machine and tool kit. The tool kit will ship from Bosch at no charge.
The December 2018 Emerging Issues Broadcast, course number 10218.12V will be available through the Center of Learning on Thursday, December 13. The broadcast contains a video demonstrating the procedure on a Chevrolet Colorado and details on the new Mobil 1 Synthetic LV ATF HP transmission fluid.
The detailed service procedure may seem complicated at first review. However, we are confident that once you've completed the procedure you will find it relatively easy.
Proper Diagnosis: Sometimes shudder is not caused by the torque converter clutch (TCC). In some instances, shudder is fish bite, chuggle, surge or vibration. Utilizing the GDS and or the PICO Scope will help confirm the issue is TCC shudder. We have seen cases of suspected TCC shudder turn out to be engine performance, tire/wheel vibration or a driveline vibration.
Please do not contact the Technical Assistance Center (TAC) seeking information on when the new Mobil 1 Synthetic LV ATF HP transmission fluid and tool kit will be available nationwide. TAC does not have any additional information.
For those dealers that are not among the initial selected group. Please continue to follow 16-NA-175 and 18-NA-177 until the new service procedure is available nationwide. We are working diligently to get the new service solution available to all dealers and will advise through an additional Global Connect message once available.
Thank you for your cooperation.
GM CUSTOMER CARE & AFTERSALES
The following 3 users liked this post by pkincy:
The following users liked this post:
pkincy (01-16-2019)
01-16-2019, 09:36 PM
#79
Race Director
New fluid formula they're getting closer. Good news.
01-17-2019, 01:10 PM
#80
Anyone have a list of the dealers with access and doing the new procedure?