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Discussion Starter #1
Hello Everyone. Couple of things. I took my 2019 Blazer RS into the dealership back in the middle of December for a slight shudder when cruising at 35-40MPH with very light throttle. I didn't experience this issue in the 5K miles I have put on the Blazer up until then. There was a service bulletin describing the issue perfectly and GM stated that is was from too much assembly lubricant in the transmission fluid. I was very critical of how the transmission behaved as I just traded my 2016 Camaro SS with the dreaded transmission shudder that effects many of GM's models with the 8 speed transmission. They performed the bulletin and sent me on my way making sure that I put on at least 200 miles before determining that the issue was corrected. I put on 600 more miles and the shudder never went away. I called the dealer and returned the Blazer to them on December 23rd 2019. They had it for a few days and determined they couldn't reproduce the issue. I traveled back to the dealer and drive it with the technician where is shuddered every time I cruised at 35-40MPH. They had the Blazer for a few more days and called me back on January 3rd and stated that there was nothing they / GM could do and that it was determined to be "normal". I referenced GM's own bulletin again and said that they determined the shudder is not normal. They said it was from the AFM and not the transmission. OK, got it... but it's still an issue that needs to be addressed. The dealer stated that there was nothing that GM could do. Unsatisfied I called GM directly and started a case with them. The Blazer sat at the dealership for another 20 days (31 days total out of service) and nobody from GM instructed the dealer to perform any diagnostics at all. They drove several other Blazers to which they also shuddered between 35-40MPH so they deemed mine and the other Blazers as "operating as designed". With that logic the dreaded 8 speed transmission shudder would also be "normal"and "operating as designed". My dealership has been absolutely fantastic, GM on the other hand has been absolutely no help what so ever. GM has released several software updates, exhaust modifications and have even loosened the engine and transmission on the Silverado's in order to absorb the shudder in the AFM in the trucks. But for the Blazer it's "operating as designed"... only because they are clueless on how to fix it. Long story longer...The shudder is not the end of the world. I have to be on a very smooth road and lightly cruising at about 35 MPH and it vibrates / shudders once the AFM kicks in. It's beyond annoying. I'ts sad the GM doesn't care about the satisfaction of their customers and takes the dealers word for it that it's operating as normal, instead of actually sending someone out to drive and diagnose the issue properly. Hopefully if enough people complain they will do something about it. Until then this is the last GM I buy. Thanks for reading everyone
 

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Hello Everyone. Couple of things. I took my 2019 Blazer RS into the dealership back in the middle of December for a slight shudder when cruising at 35-40MPH with very light throttle. I didn't experience this issue in the 5K miles I have put on the Blazer up until then. There was a service bulletin describing the issue perfectly and GM stated that is was from too much assembly lubricant in the transmission fluid. I was very critical of how the transmission behaved as I just traded my 2016 Camaro SS with the dreaded transmission shudder that effects many of GM's models with the 8 speed transmission. They performed the bulletin and sent me on my way making sure that I put on at least 200 miles before determining that the issue was corrected. I put on 600 more miles and the shudder never went away. I called the dealer and returned the Blazer to them on December 23rd 2019. They had it for a few days and determined they couldn't reproduce the issue. I traveled back to the dealer and drive it with the technician where is shuddered every time I cruised at 35-40MPH. They had the Blazer for a few more days and called me back on January 3rd and stated that there was nothing they / GM could do and that it was determined to be "normal". I referenced GM's own bulletin again and said that they determined the shudder is not normal. They said it was from the AFM and not the transmission. OK, got it... but it's still an issue that needs to be addressed. The dealer stated that there was nothing that GM could do. Unsatisfied I called GM directly and started a case with them. The Blazer sat at the dealership for another 20 days (31 days total out of service) and nobody from GM instructed the dealer to perform any diagnostics at all. They drove several other Blazers to which they also shuddered between 35-40MPH so they deemed mine and the other Blazers as "operating as designed". With that logic the dreaded 8 speed transmission shudder would also be "normal"and "operating as designed". My dealership has been absolutely fantastic, GM on the other hand has been absolutely no help what so ever. GM has released several software updates, exhaust modifications and have even loosened the engine and transmission on the Silverado's in order to absorb the shudder in the AFM in the trucks. But for the Blazer it's "operating as designed"... only because they are clueless on how to fix it. Long story longer...The shudder is not the end of the world. I have to be on a very smooth road and lightly cruising at about 35 MPH and it vibrates / shudders once the AFM kicks in. It's beyond annoying. I'ts sad the GM doesn't care about the satisfaction of their customers and takes the dealers word for it that it's operating as normal, instead of actually sending someone out to drive and diagnose the issue properly. Hopefully if enough people complain they will do something about it. Until then this is the last GM I buy. Thanks for reading everyone
 

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I have in writing from GM that the shudder/vibration in my 2019 chevy blazer (at 1500 RPMs is caused by the active fuel management system) it only effects 2019-2020 blazers with V 6 engines The corrective measure is to have new data download and all vehicles re-calibrated. GM engineers tested other blazers and they all had the same shudder/vibration issue that mine has. This occurs when you are travelling at a steady speed and your tack is at 1500 RPM ( this is when your active fuel management system kicks in ) GM spent over 15,000 dollars replaced my transmission on a brand new vehicle only to find out the real cause ACTIVE FUEL MANAGEMENT . GM sales staff, service advisors and service managers were unaware of this issue as demonstrated by the 85 days that my vehicle spent at my local dealership trying to solve the problem. Everyone who ownes a 2019-2020 chevy blazer with a V 6 engine should be made aware of this issue via GM RECALL, and any potential purchaser should equally be warned. I really love my new chevy blazer and hope that General Motors can do the right thing advise all current owners of the issue and have it corrected ASAP
 

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Discussion Starter #4
You actually had the transmission replaced ? This "new data download" is it available and did it correct your issue. My dealer and GM are not aware of any data download at this time. I have taken this as far as I can go through GM and they have responded back each time that my blazer operates as designed
 

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Hello Everyone. Couple of things. I took my 2019 Blazer RS into the dealership back in the middle of December for a slight shudder when cruising at 35-40MPH with very light throttle. I didn't experience this issue in the 5K miles I have put on the Blazer up until then. There was a service bulletin describing the issue perfectly and GM stated that is was from too much assembly lubricant in the transmission fluid. I was very critical of how the transmission behaved as I just traded my 2016 Camaro SS with the dreaded transmission shudder that effects many of GM's models with the 8 speed transmission. They performed the bulletin and sent me on my way making sure that I put on at least 200 miles before determining that the issue was corrected. I put on 600 more miles and the shudder never went away. I called the dealer and returned the Blazer to them on December 23rd 2019. They had it for a few days and determined they couldn't reproduce the issue. I traveled back to the dealer and drive it with the technician where is shuddered every time I cruised at 35-40MPH. They had the Blazer for a few more days and called me back on January 3rd and stated that there was nothing they / GM could do and that it was determined to be "normal". I referenced GM's own bulletin again and said that they determined the shudder is not normal. They said it was from the AFM and not the transmission. OK, got it... but it's still an issue that needs to be addressed. The dealer stated that there was nothing that GM could do. Unsatisfied I called GM directly and started a case with them. The Blazer sat at the dealership for another 20 days (31 days total out of service) and nobody from GM instructed the dealer to perform any diagnostics at all. They drove several other Blazers to which they also shuddered between 35-40MPH so they deemed mine and the other Blazers as "operating as designed". With that logic the dreaded 8 speed transmission shudder would also be "normal"and "operating as designed". My dealership has been absolutely fantastic, GM on the other hand has been absolutely no help what so ever. GM has released several software updates, exhaust modifications and have even loosened the engine and transmission on the Silverado's in order to absorb the shudder in the AFM in the trucks. But for the Blazer it's "operating as designed"... only because they are clueless on how to fix it. Long story longer...The shudder is not the end of the world. I have to be on a very smooth road and lightly cruising at about 35 MPH and it vibrates / shudders once the AFM kicks in. It's beyond annoying. I'ts sad the GM doesn't care about the satisfaction of their customers and takes the dealers word for it that it's operating as normal, instead of actually sending someone out to drive and diagnose the issue properly. Hopefully if enough people complain they will do something about it. Until then this is the last GM I buy. Thanks for reading everyone
I have in writing from GM that the shudder/vibration in my 2019 chevy blazer (at 1500 RPMs is caused by the active fuel management system) it only effects 2019-2020 blazers with V 6 engines The corrective measure is to have new data download and all vehicles re-calibrated. GM engineers tested other blazers and they all had the same shudder/vibration issue that mine has. This occurs when you are travelling at a steady speed and your tack is at 1500 RPM ( this is when your active fuel management system kicks in ) GM spent over 15,000 dollars replaced my transmission on a brand new vehicle only to find out the real cause ACTIVE FUEL MANAGEMENT . GM sales staff, service advisors and service managers were unaware of this issue as demonstrated by the 85 days that my vehicle spent at my local dealership trying to solve the problem. Everyone who ownes a 2019-2020 chevy blazer with a V 6 engine should be made aware of this issue via GM RECALL, and any potential purchaser should equally be warned. I really love my new chevy blazer and hope that General Motors can do the right thing advise all current owners of the issue and have it corrected ASAP
 

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My vehicle was at the dealership for a total 85 days they changed transmission fluid replaced the torque converter in the transmission and after that they put in brand new transmission in the vehicle. My service manager worked tirelessly to correct the shudder-vibration. Engineers from GM came into the dealership for a third time and after days of effort they informed the dealership that the cause was the active fuel management system. The shudder-vibration occurs when you are travelling at a steady speed at 1500 RPM in all gears. They gave the results to my dealer and the dealership forwarded this infer to me in writing. While the engineers were at my dealership they asked if they could run the same test on other new V 6 new blazers. They found the same issue with each blazer they tested, they even went to another dealership to run it again with the same result. I personally tested 4 different blazers and all were the same. My service Manager informed me that the solution was new data program was needed and each effected new vehicle would require re-calibration. This sounds like a recall that GM probably wants to avoid. GM Customer Care 1-800-263-3777 ask for Daniel at ext 5912054 she is aware of the situation and the engineers findings. GM needs to step up and do the right thing, inform existing owners as well as service advisors and service managers at the dealerships who are not informed as mine is. My dealership spent over 12,000.00 on my vehicle trying to correct this issue. Despite the issue I really enjoy my new vehicle and hope GM will do the right thing... Why this information is not sent out to the GM dealerships across north america is beyond my comprehension, unless they are trying to hide it. Good Luck with the information and if we all get together as consumers we may be able to get GM to move on this problem. (they should talk to their own engineers that we able to diagnose the problem)
 

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My vehicle was at the dealership for a total 85 days they changed transmission fluid replaced the torque converter in the transmission and after that they put in brand new transmission in the vehicle. My service manager worked tirelessly to correct the shudder-vibration. Engineers from GM came into the dealership for a third time and after days of effort they informed the dealership that the cause was the active fuel management system. The shudder-vibration occurs when you are travelling at a steady speed at 1500 RPM in all gears. They gave the results to my dealer and the dealership forwarded this infer to me in writing. While the engineers were at my dealership they asked if they could run the same test on other new V 6 new blazers. They found the same issue with each blazer they tested, they even went to another dealership to run it again with the same result. I personally tested 4 different blazers and all were the same. My service Manager informed me that the solution was new data program was needed and each effected new vehicle would require re-calibration. This sounds like a recall that GM probably wants to avoid. GM Customer Care 1-800-263-3777 ask for Daniel at ext 5912054 she is aware of the situation and the engineers findings. GM needs to step up and do the right thing, inform existing owners as well as service advisors and service managers at the dealerships who are not informed as mine is. My dealership spent over 12,000.00 on my vehicle trying to correct this issue. Despite the issue I really enjoy my new vehicle and hope GM will do the right thing... Why this information is not sent out to the GM dealerships across north america is beyond my comprehension, unless they are trying to hide it. Good Luck with the information and if we all get together as consumers we may be able to get GM to move on this problem. (they should talk to their own engineers that we able to diagnose the problem)
Hi, Is-it possible to have your dealer name so my dealer can contact him ?
 

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I would be more than happy to share dealerships name and the service managers name as he is totally aware of this situation. please call vern roberts 1-289-567-0656
Hi, Is-it possible to have your dealer name so my dealer can contact him ?
 

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Discussion Starter #9
So did they download new data and now your shudder is completely gone ? Sadly the US GM dealers are still unaware of the new data download
 

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They have not downloaded the new data and to the best of my knowledge they are not even working on it. All owners of Chevy Blazers (V6) should start pressuring GM for this new data program. Once again it is GM's engineering staffs that detected this problem, GM should do the right thing and advise all owners of this issue and have a recall. If you would like additional info, you can call the car guy at 289- 567-0656
 

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They have not downloaded the new data and to the best of my knowledge they are not even working on it. All owners of Chevy Blazers (V6) should start pressuring GM for this new data program. Once again it is GM's engineering staffs that detected this problem, GM should do the right thing and advise all owners of this issue and have a recall. If you would like additional info, you can call the car guy at 289- 567-0656
 

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You actually had the transmission replaced ? This "new data download" is it available and did it correct your issue. My dealer and GM are not aware of any data download at this time. I have taken this as far as I can go through GM and they have responded back each time that my blazer operates as designed
 

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You actually had the transmission replaced ? This "new data download" is it available and did it correct your issue. My dealer and GM are not aware of any data download at this time. I have taken this as far as I can go through GM and they have responded back each time that my blazer operates as designed
 

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  2. You actually had the transmission replaced ? This "new data download" is it available and did it correct your issue. My dealer and GM are not aware of any data download at this time. I have taken this as far as I can go through GM and they have responded back each time that my blazer operates as designed
 

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I have a 2019 Blazer V6 with 25k miles on it. I noticed the shudder occurs when the eng is running in the V4 mode. You can see this if the trip screen or fuel economy screen is displayed. Does the new software update change this feature so the eng runs in the V6 mode at the 1500 rpm around 30 to 35? Who ever had the update.... can you monitor this and get back to me please?
 

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Discussion Starter #20
I have a 2019 Blazer V6 with 25k miles on it. I noticed the shudder occurs when the eng is running in the V4 mode. You can see this if the trip screen or fuel economy screen is displayed. Does the new software update change this feature so the eng runs in the V6 mode at the 1500 rpm around 30 to 35? Who ever had the update.... can you monitor this and get back to me please?
GM has not released new software for the Blazer yet. They have tried many software updates as well as moving the engine / transmission on other models to soften or eliminate the shudder. I don't really think GM has a handle on the AFM systems yet and it causing us, the owners, all the issues. Sad really
 
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