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bturner2 · 11-07-2018, 06:31 AM

By your description it certainly sounds like the shudder issue.

First thing to do is remember the 5 P's, Proper Planing Prevents Poor Performance. In this case those 5 P's refer to being prepared to demonstrate the issue you're having and present documentation supporting your statements regarding the issue. Start by hedging your bet by figuring out how to consistently reproduce the issue. Some shops are better than others trying to reproduce an issue but too many just take the fee and run. And the worst use the fee to scare you away.

Unfortunately, if you want to be successful here you're going to have to do more documentation on your own and figure out how to replicate the problem. You'll need to start paying more attention to exactly what situations the issue is occurring. Don't know what model you have based on your user profile but on my 2SS I used those fancy gauges to document the problem. The tach and speedo are important as you can lock the RPM and speed in for the issue, which you've already done and that's a good start. On my SS AFM was directly tied to reproducing the problem consistently. What I did was set my center stack information display to the panel where it would show you when the car would go from V8 to V4 mode. When the car was in V4 mode I would gently accelerate keeping the car in V4 mode and the shudder would start. After pinning this down I was not only able to reproduce the issue at highway speeds where I had originally experienced the issue but also at slower speeds where the car was essentially in the same operation mode.

Once you've figured out when it occurs and how to replicate the issue write your procedure down being as detailed as you can describing how to get the car in the failed state and take the document to the dealer with you. Many times the problem your having gets lost in the translation between the write up person and the tech because the write up person was too lazy to write an accurate description or just inaccurately documented it. Be prepared to go for a ride with the write up person or tech to reproduce the issue should they say that they can't find anything. Also take the service bulletin documented on this forum with you.

Lastly GM knows this issue very well. Don't be afraid to talk to the service manger directly, call the customer satisfaction help line or contact the area manager if the dealer starts trying to charge you for a very well documented defect.

11-07-2018, 06:31 AM	#7
bturner2 Drives: 2SS, Hyper Blue, Sunroof, NPP, MRC Join Date: Jul 2016 Location: Michigan Posts: 205	By your description it certainly sounds like the shudder issue. First thing to do is remember the 5 P's, Proper Planing Prevents Poor Performance. In this case those 5 P's refer to being prepared to demonstrate the issue you're having and present documentation supporting your statements regarding the issue. Start by hedging your bet by figuring out how to consistently reproduce the issue. Some shops are better than others trying to reproduce an issue but too many just take the fee and run. And the worst use the fee to scare you away. Unfortunately, if you want to be successful here you're going to have to do more documentation on your own and figure out how to replicate the problem. You'll need to start paying more attention to exactly what situations the issue is occurring. Don't know what model you have based on your user profile but on my 2SS I used those fancy gauges to document the problem. The tach and speedo are important as you can lock the RPM and speed in for the issue, which you've already done and that's a good start. On my SS AFM was directly tied to reproducing the problem consistently. What I did was set my center stack information display to the panel where it would show you when the car would go from V8 to V4 mode. When the car was in V4 mode I would gently accelerate keeping the car in V4 mode and the shudder would start. After pinning this down I was not only able to reproduce the issue at highway speeds where I had originally experienced the issue but also at slower speeds where the car was essentially in the same operation mode. Once you've figured out when it occurs and how to replicate the issue write your procedure down being as detailed as you can describing how to get the car in the failed state and take the document to the dealer with you. Many times the problem your having gets lost in the translation between the write up person and the tech because the write up person was too lazy to write an accurate description or just inaccurately documented it. Be prepared to go for a ride with the write up person or tech to reproduce the issue should they say that they can't find anything. Also take the service bulletin documented on this forum with you. Lastly GM knows this issue very well. Don't be afraid to talk to the service manger directly, call the customer satisfaction help line or contact the area manager if the dealer starts trying to charge you for a very well documented defect. Last edited by bturner2; 11-07-2018 at 06:53 AM.