New TSB includes 2017 A8
03-02-2017, 03:56 PM
#21
Melting Slicks
I was reading a magazine review of the 2017 Cadillac CT6(Cadillac's flagship) a couple of days ago, and they mentioned the A8's bad behavior at low speeds/low gears.
If one was also looking at a new Lexus or Mercedes, with their silky smooth transmissions, why would one even consider a Cadillac with an A8?
If the Cadillac engineers can't get it working correctly in their flagship CT6, who believes that a Chevy engineer can do better?
If one was also looking at a new Lexus or Mercedes, with their silky smooth transmissions, why would one even consider a Cadillac with an A8?
If the Cadillac engineers can't get it working correctly in their flagship CT6, who believes that a Chevy engineer can do better?
Last edited by Hopper12; 03-02-2017 at 10:56 PM.
03-02-2017, 04:39 PM
#22
It's not the fluid, I'm not sure why it would need flushing unless some other contamination is involved. This protocol was instituted back in 2015 when the A8 first started going whacky and before they started re designing and replacing torque converters. That said I'm not sure why GM would implement such a TSB again when it didn't work in 2015. I wonder if GM will ever fess up to this disaster and come clean with its owners on this issue. The fact that any time this comes up at a GM discussion and GM engineers play dumb or say it's only 2-3% of the total A8 population that is problematic is such an obvious lie now that GM is really starting to discredit its self as a respected auto maker. Sometimes you have to own your mistakes in order to move on. IMO GM should refund the MSRP price paid over the standard M7 to each and every A8 owner for selling them a junk automatic transmission and then charging an up charge for that junk. If not a refund GM should extend the warranty on the A8 to 10 years or 200,000 miles to regain owner confidence.
03-02-2017, 04:58 PM
#23
http://www.agcoauto.com/content/news/p2_articleid/203
The saga continues..........
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03-02-2017, 05:09 PM
#24
Looks like Mobil 1 Synthetic LV ATF DEXRON HP can be found for about 10 or 11 bucks a quart. I would try doing a 3 cycle flush myself, but, at a cost of around $300 just for the fluid I think I'll let the dealer do it.
Sounds better than a transmission R/R with torque converter change! I'm sure the car would never be the same after a repair like that.
Sounds better than a transmission R/R with torque converter change! I'm sure the car would never be the same after a repair like that.
03-02-2017, 06:40 PM
#25
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Guess I will be holding onto my 2014 A6 till at least the 2018 model arrives. 3 years and they cant get the A8 problem solved WTF!
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CRABBYJ (03-03-2017)
03-02-2017, 06:43 PM
#26
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KMS-CO (03-02-2017)
03-02-2017, 06:53 PM
#27
Team Owner
What is odd to me, is that GM doesn't seem to want to stick it in the Silverado or in the CT6. Wonder why the delay in the ZL1 with the A10 or that the ZL1 1LE doesn't even offer an automatic(either the A8 or the A10) since it has the same engine as the C7 Z06.
All that money spent on a new transmission design and GM doesn't seem to be in a hurry to capitalize on it.
Last edited by JoesC5; 03-02-2017 at 06:57 PM.
03-02-2017, 07:08 PM
#28
Racer
I noticed no mention of the rpm fluctuations in this newest TSB. That's all mine is doing right now without the shudder. The Range AFM delete makes driving it more pleasant, so I'm keeping it plugged in for now.
Last edited by ddelallata; 03-02-2017 at 07:08 PM.
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BOBSZ06 (03-05-2017)
03-02-2017, 10:31 PM
#29
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
That's what mine did at first, just rpm fluctuations. Unfortunately, it evolved into the shuddering symptoms synchronized with each fluctuation.
That's what mine did at first, just rpm fluctuations. Unfortunately, it evolved into the shuddering symptoms synchronized with each fluctuation.
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03-02-2017, 10:53 PM
#30
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I was reading a magazine review of the 2017 Cadillac CT6(Cadillac's flagship) a couple of days ago, and they mentioned the A8's bad behavior at low speeds/low gears.
If one was also looking at a new Lexus or Mercedes, with their silky smooth transmissions, why would one even consider a Cadillac with an A8?
If the Cadillac engineers can't get it working correctly in their flagship CT6, who believes that a Chevy engineer can do better?
If one was also looking at a new Lexus or Mercedes, with their silky smooth transmissions, why would one even consider a Cadillac with an A8?
If the Cadillac engineers can't get it working correctly in their flagship CT6, who believes that a Chevy engineer can do better?
03-03-2017, 02:05 AM
#32
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It does seem strange that GM can't get this issue fixed. Not good for business.
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KMS-CO (03-03-2017)
03-03-2017, 06:51 AM
#33
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I am blessed. No issues. Either car.
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KMS-CO (03-03-2017)
03-03-2017, 07:58 AM
#34
Safety Car
You will join the club, you are just postponing the TC change. When it starts to shudder, it only will get worse and the shuddering will drive you crazy, especially on a long trip when you use your cruise control. Been there done that TC change, now the transmission is flawless.
03-03-2017, 08:18 AM
#35
Team Owner
http://www.caranddriver.com/cadillac/ct6
03-03-2017, 09:33 AM
#37
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"Low-speed shift quality also falls short of class leading; one of our drivers even remarked that he experienced severe shudder on downshifts into first gear in normal operation. That’s concerning. Shouldn’t the drivetrain of Cadillac’s biggest sedan make velvety operation its number-one priority regardless of cylinder count or transmission ratios?"
http://www.caranddriver.com/cadillac/ct6
http://www.caranddriver.com/cadillac/ct6
03-03-2017, 11:01 AM
#38
03-03-2017, 11:36 AM
#39
AFM is definitely a part of the scenario. One time I witnessed the oil pressure fluctuating like crazy during an episode. WTF is up with that? I know that regulating oil pressure in the AFM lifters is part of the whole cylinder deactivation thing. Maybe, just like the cause of a lot of airplane crashes, there is a chain of events that are contributing. Could it be a combination of AFM, TC clutch design/materials, AT fluid, design algorithms in the controllers, the Russians....
It would be great if an ATF flush and change could cure this issue. I'm hopeful that it will. I'm gonna speak to local service and see what their thoughts are. I absolutely do not want a TC change unless absolutely necessary. So far, that has not cured all problems to a 100% cure rate.
I love this car, but.....stuff like this drives me nuts. Is Chevy staying silent because it's cheaper to just "grease the squeaking wheels"? Does Chevy really care but just can't figure it out? I believe this problem can be fixed. It's just gonna take some good engineers and a little more time.
Come on Chevy! Step up and fix this before you start to lose some core fans. Most of us buy your other stuff too.
03-03-2017, 02:51 PM
#40
Le Mans Master
That's what I'm afraid of. I was cruising at 50mph yesterday and getting a 100rpm fluctuation between 1500 and 1600 while in A and V4 steady. As soon as I moved the shifter to M the RPMs held steady at 1500, the car went into V8 and never changed gears. Steady as a rock.
AFM is definitely a part of the scenario. One time I witnessed the oil pressure fluctuating like crazy during an episode. WTF is up with that? I know that regulating oil pressure in the AFM lifters is part of the whole cylinder deactivation thing. Maybe, just like the cause of a lot of airplane crashes, there is a chain of events that are contributing. Could it be a combination of AFM, TC clutch design/materials, AT fluid, design algorithms in the controllers, the Russians....
It would be great if an ATF flush and change could cure this issue. I'm hopeful that it will. I'm gonna speak to local service and see what their thoughts are. I absolutely do not want a TC change unless absolutely necessary. So far, that has not cured all problems to a 100% cure rate.
I love this car, but.....stuff like this drives me nuts. Is Chevy staying silent because it's cheaper to just "grease the squeaking wheels"? Does Chevy really care but just can't figure it out? I believe this problem can be fixed. It's just gonna take some good engineers and a little more time.
Come on Chevy! Step up and fix this before you start to lose some core fans. Most of us buy your other stuff too.
AFM is definitely a part of the scenario. One time I witnessed the oil pressure fluctuating like crazy during an episode. WTF is up with that? I know that regulating oil pressure in the AFM lifters is part of the whole cylinder deactivation thing. Maybe, just like the cause of a lot of airplane crashes, there is a chain of events that are contributing. Could it be a combination of AFM, TC clutch design/materials, AT fluid, design algorithms in the controllers, the Russians....
It would be great if an ATF flush and change could cure this issue. I'm hopeful that it will. I'm gonna speak to local service and see what their thoughts are. I absolutely do not want a TC change unless absolutely necessary. So far, that has not cured all problems to a 100% cure rate.
I love this car, but.....stuff like this drives me nuts. Is Chevy staying silent because it's cheaper to just "grease the squeaking wheels"? Does Chevy really care but just can't figure it out? I believe this problem can be fixed. It's just gonna take some good engineers and a little more time.
Come on Chevy! Step up and fix this before you start to lose some core fans. Most of us buy your other stuff too.