Did the A8 problems ever get fixed?
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,865
From: Virginia
Le Mans Master
Joined: Sep 2013
Posts: 7,137
Likes: 3,176
From: Kannapolis MA.
Got over 30k miles on a 2017 GS now.No shutter till I pulled my Range Device about 2000 miles ago.Had triple flush done without Range device just in case there could be a issue with it at the dealer? Immediately plugged back in.
Tranny is fine plugged in.Gonna keep it plugged in until Inspection time clearing again.
Tranny is fine plugged in.Gonna keep it plugged in until Inspection time clearing again.
Last edited by DALE#3; May 29, 2021 at 08:06 AM.
Intermediate
Joined: Oct 2014
Posts: 41
Likes: 20
From: Lincoln, NE
I took my 2019 GS in last fall for the triple flush even though I was having no issues.
This spring I was 7 hrs into a 10 hour drive and the transmission began surging when dropping into V4, sometimes it would be 10-12 surges before dropping into V4. It had been performing flawlessly and even that first shift in the morning was smooth as silk. It has continued to get worse and now it surges 100 rpm then drops into v4 and continues to slightly surge even in manual mode.
I checked the part number on the fluid used in the triple flush and it was the newest fluid.
it’s at the dealer as of this morning.
This spring I was 7 hrs into a 10 hour drive and the transmission began surging when dropping into V4, sometimes it would be 10-12 surges before dropping into V4. It had been performing flawlessly and even that first shift in the morning was smooth as silk. It has continued to get worse and now it surges 100 rpm then drops into v4 and continues to slightly surge even in manual mode.
I checked the part number on the fluid used in the triple flush and it was the newest fluid.
it’s at the dealer as of this morning.
Race Director
Joined: Oct 2005
Posts: 10,020
Likes: 3,427
From: Plymouth Massachusetts
2025 C7 of the Year Finalist- Unmodified
2024 C7 of the Year Finalist - Unmodified
2020 C7 of the Year Finalist -- Unmodified
I took my 2019 GS in last fall for the triple flush even though I was having no issues.
This spring I was 7 hrs into a 10 hour drive and the transmission began surging when dropping into V4, sometimes it would be 10-12 surges before dropping into V4. It had been performing flawlessly and even that first shift in the morning was smooth as silk. It has continued to get worse and now it surges 100 rpm then drops into v4 and continues to slightly surge even in manual mode.
I checked the part number on the fluid used in the triple flush and it was the newest fluid.
it’s at the dealer as of this morning.
This spring I was 7 hrs into a 10 hour drive and the transmission began surging when dropping into V4, sometimes it would be 10-12 surges before dropping into V4. It had been performing flawlessly and even that first shift in the morning was smooth as silk. It has continued to get worse and now it surges 100 rpm then drops into v4 and continues to slightly surge even in manual mode.
I checked the part number on the fluid used in the triple flush and it was the newest fluid.
it’s at the dealer as of this morning.
Le Mans Master
Joined: May 2005
Posts: 6,659
Likes: 828
From: FORT LAUDERDALE FL
My 2016 started at around 1,000 miles. Now at 1,155 w/range I'm going to have to get it flushed. My 2016 CTS 4 had the flush done in Jan. last year and it fixed the issue immediately.
Instructor
Joined: Jun 2021
Posts: 100
Likes: 24
From: Lakeland, FL
I took my 2019 GS in last fall for the triple flush even though I was having no issues.
This spring I was 7 hrs into a 10 hour drive and the transmission began surging when dropping into V4, sometimes it would be 10-12 surges before dropping into V4. It had been performing flawlessly and even that first shift in the morning was smooth as silk. It has continued to get worse and now it surges 100 rpm then drops into v4 and continues to slightly surge even in manual mode.
I checked the part number on the fluid used in the triple flush and it was the newest fluid.
it’s at the dealer as of this morning.
This spring I was 7 hrs into a 10 hour drive and the transmission began surging when dropping into V4, sometimes it would be 10-12 surges before dropping into V4. It had been performing flawlessly and even that first shift in the morning was smooth as silk. It has continued to get worse and now it surges 100 rpm then drops into v4 and continues to slightly surge even in manual mode.
I checked the part number on the fluid used in the triple flush and it was the newest fluid.
it’s at the dealer as of this morning.
Also, do you know why it's called a triple flush? Is it called a triple flush because they flush the fluid 3 times or is it just the name of the fluid they use? Kind of a dumb question I know. lol
Drifting
Joined: Aug 2013
Posts: 1,502
Likes: 515
From: Hill Country Texas
Would you happen to still have that part number for the newest triple flush fluid? I have a 2017 GS with the shudder problem. I have an appointment at the dealership in two days to get the flush done.
Also, do you know why it's called a triple flush? Is it called a triple flush because they flush the fluid 3 times or is it just the name of the fluid they use? Kind of a dumb question I know. lol
Also, do you know why it's called a triple flush? Is it called a triple flush because they flush the fluid 3 times or is it just the name of the fluid they use? Kind of a dumb question I know. lol
Last edited by BigVette427; Jun 7, 2021 at 02:33 PM.
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Drifting
Joined: May 2010
Posts: 1,274
Likes: 75
From: Fairfield County, CT
I joined the unfortunate group of those afflicted with A8 transmission issues a short time ago. Bought car with 1,200 miles on. By 1,500 I had the shudder. Triple flush seemed to lessen the jolt from 5th to 4th and 4th to 3rd but now have what can only be described as getting rear ended when downshifting to and from 7th. Dealer following same direction GM has been giving for years: 1) flush 2) new valve body 3) new TCM 4) prayer.
Others I know have no issues, others, similar to mine - damn luck of the draw with these A8 disasters. 400k views on trans failure post says a lot.
Roll the dice and good luck whichever way you choose to go.
Others I know have no issues, others, similar to mine - damn luck of the draw with these A8 disasters. 400k views on trans failure post says a lot.
Roll the dice and good luck whichever way you choose to go.
Last edited by TKOGTO; Jun 7, 2021 at 03:13 PM.
Instructor
Joined: Jun 2021
Posts: 100
Likes: 24
From: Lakeland, FL
Thanks for that information brother. Semper Fi
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
I don't know what percentage of A8 owners have had issues, but with my 2015 A8 I threw snake-eyes and my entire two-year ownership was a royal PITA. I had both the shudder and the o-ring issues that caused sporadic delayed engagement, and both were intermittent. Since neither could be demonstrated to a dealer at first I had to live with the maladies for that two year period, that is until the shudder became so frequent that I was able to demonstrate it to a dealer.
The TC was replaced along with the triple-flush in early 2017, apparently not with the newest fluid that was the real fix, but even though the tranny worked fine after the repair I had had enough. To make matters worse, I was never able to demonstrate the delayed-engagement (o-ring) issue, so even though they had the tranny out of the car for the TC repair GM would not authorize the o-ring repair. I loved the car but the tranny issues were too much and I didn't want to face what some had experienced with multiple repairs, so two weeks after the TC repair I traded it for a 2017 GS M7. Life has been good ever since.
I can only report my experience, but based on that I would never own another car/truck/SUV equipped with an A8, nor would I recommend it to anyone.
The TC was replaced along with the triple-flush in early 2017, apparently not with the newest fluid that was the real fix, but even though the tranny worked fine after the repair I had had enough. To make matters worse, I was never able to demonstrate the delayed-engagement (o-ring) issue, so even though they had the tranny out of the car for the TC repair GM would not authorize the o-ring repair. I loved the car but the tranny issues were too much and I didn't want to face what some had experienced with multiple repairs, so two weeks after the TC repair I traded it for a 2017 GS M7. Life has been good ever since.
I can only report my experience, but based on that I would never own another car/truck/SUV equipped with an A8, nor would I recommend it to anyone.
Last edited by iclick; Jun 8, 2021 at 07:40 PM.
Burning Brakes
Joined: Oct 2004
Posts: 1,075
Likes: 570
From: Bowmanville, Ontario, Canada
I taught my wife to drive manual on our 78 C3 which was much more challenging to drive than a smooth M7 on the C7...heavy clunky shifter and non-hydraulic clutch. She loved it when we moved to a C5 M6 and now the C7 M7.
Team Owner
Joined: Feb 2000
Posts: 45,467
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Team Owner
Joined: Feb 2000
Posts: 45,467
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Reading forum threads on the A8 will have you believing that 95% of all C7 A8s have issue as forums is where those with issues come to report/complain. You don't find the thousands of C7 A8 owners who have not had any issues creating threads on it.
Realistically, only approx 5% of C7 A8s have had issues and the triple-flush process has cured issues for the vast majority of them.
by the time I finish researching any product on the internet, I’m afraid to move forward with the purchase 
Race Director
Joined: May 2001
Posts: 15,324
Likes: 2,080
From: Guelph, Ontario
I have a late build 2018 (built in Dec 2017, just a few weeks before 2019 production started) so I'm really not sure if I had the latest fluid from the factory but either way I have 33k on it and it hasn't given me any trouble.
Advanced
Joined: Aug 2018
Posts: 52
Likes: 28
From: Texas
I have a 2017 Grand Sport. Purchased new, May 2018. Bought the Range device immediately.
At about 4500 miles I told the dealer about the shutter. I was not having any issues at all. The car was running/shifting perfect. I just wanted the new fluid for piece of mind. Dealer did the Triple flush with no questions asked. It took about 3 hours. No charge, it was still under warranty. Car is still running perfect.
At about 4500 miles I told the dealer about the shutter. I was not having any issues at all. The car was running/shifting perfect. I just wanted the new fluid for piece of mind. Dealer did the Triple flush with no questions asked. It took about 3 hours. No charge, it was still under warranty. Car is still running perfect.
Race Director
Joined: Oct 2005
Posts: 10,020
Likes: 3,427
From: Plymouth Massachusetts
2025 C7 of the Year Finalist- Unmodified
2024 C7 of the Year Finalist - Unmodified
2020 C7 of the Year Finalist -- Unmodified
Had a A6 in a 2014 Stingray Z51 . Great Tranny !
