A8 issue fixed on 2017 models?
Burning Brakes
Joined: Jul 2015
Posts: 920
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Drifting
Joined: Dec 2003
Posts: 1,711
Likes: 90
From: Hillsdale NJ
roSSco..........you can come back any time and post you are putting us on. If not I feel so bad for you. I hope after going through the A8 issues you mentioned with your 2015 Corvette history is not repeating itself. I was under a general impression that a new redesigned TC was added to the A8 and by mid year 2016 all was well. Not saying A8 could not still have issues but ongoing A8 problems into 2017 is a head scratcher.
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Drifting
Joined: Jan 2006
Posts: 1,554
Likes: 158
Jay Davis glad you got the new TC but sorry to hear about cold shift issue. FWIW I will tell you what I did in my June build 2015 and my cold shift bump went away. Upon cold start after a night in the garage I wait 30 to 45 at idle in Park then shift to Reverse and then slowly back out of the garage on to the street. I live in a development so no issue for me. Foot on Brake, car stopped shift to Drive. Foot off brake. Car will start to move slow and I gently give it enough gas just to lightly increase speed. Just enough to facilitate a shift but not so much to force a shift. As speed increases you will feel trans shift from 1st to 2nd and perhaps a light shift bump. You can continue to increase speed normal as shifting should be OK. Doing this same process over several days I found the 1st to 2nd shift bump to get softer and softer until it went away all together. Have not had any 1st to 2nd cold shift issue in months. I never drive aggressive when the car is cold and when getting the 1st to 2nd cold shift bump I wanted to make that happen as soft as possible hence the slower start. I mentioned this process to the service tech at the dealer and he said the A8 adjusts to driving patterns. Whatever, all I know is it worked. Give it a shot. Hope it helps.
Last edited by Nice Ride; Aug 15, 2016 at 09:02 PM.
Drifting
Joined: Feb 2001
Posts: 1,768
Likes: 297
From: Plano TX
Same here, mine was built 10/2016, seems perfect. FYI, it is possible to get it to shift a bit rough into second in a parking lot, if you are not maintaining speed. I have had it clunk into second (not hard, just noticeable) once or twice, but it was because I confused it with my actions... Like accelerating and then letting off right when it is ready to shift, then accelerating again. Really rare though. They are finicky that way, but as long as you are driving normally, it is smooth as silk.
Melting Slicks
Joined: Dec 2004
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From: Margaritaville Daytona
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Drifting
Joined: Jun 2008
Posts: 1,365
Likes: 364
From: California
I have asked the service Department about any issues / problems on this subject answered no problems. Mine is a middle of Sept 2014 build date with just over 7000 miles, no issues yet with the A8. I have to say this is as of now the best and nicest transmission I have driven. I usually don't drive it to aggressively on the streets, only run the 1/4 & 1/8th mile at the strip maybe only around 100 run to date total.
Cruising
Joined: Jun 2016
Posts: 14
Likes: 8
From: apple valley california
I brought this posting over from the other "A8" thread.
I have a 2015 Z06 with the A8. I been a transmission repairman for 30 years this year. When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't. Now if I drive it more frequently, it doesn't have the drain back issue and the adaption stored in memory doesn't have any weird side effects. It doesn't bother me however and I did mention it in a survey I got from GM (I also stated it doesn't bother me but its not right either). I do like the gear splits a lot better over the A6. Now the only issues I have had is the TCC apply seems a bit bouncy (shutter) and on occasion I get some odd shifting adaption feelings usually returning into 1st gear. I'm guessing (I will ask on my next oil change) that there's probably some software updates out at this point. On a side note I drive fairly mellow most of the time, but when I get a wild hair going I drive it like I stole it and THOROUGHLY impressed. Things take time to sort out and my hats off to GM for the eagerness to make and build there own trans over contracting with ZF or another source to make it. I remember the days when the 700R4 came out in 1982 and how all the guff over that trans mounted up but what most of the public didn't realize is it was a major replacement coverage over other models like 400 / 350C / 250C and 200C AND the S-10 came out also. Some of the stuff I randomly read here I will also ask about the next time I'm at the service dept.
***UPDATE***
I took the car in for an oil change, and asked the service writer to see if there was a software update and addressed my concern about the 2-1 downshift random bind. When I picked up my car from service, he told me that there was not a service update for the software, however, they reset the adapts and relearned the 2-1 downshift scheduling. This helped a lot.
Adding this part to this post. Someone mentioned they had there TC replaced and the shifting is still hard. (Refer to above about adapt info). The TC only transmits power from the engine to the transmission. To help clear up some issues others have mentioned about subtle RPM changes and whatnot, when parameters are met. IE like minimum road speed / TPS angle and so on, the command for TCC apply is commanded. The TCM tries to maintain aprox. a 60 rpm slip in the TC and this is why you will see a slight momentary blip in the RPMs when a slight throttle change is seen cause the load has changed and the TCM is adjusting the duty cycle to re-achieve that 60 RPM window. In most cases once the road speed is 55+ it will be commanded to 100% duty (full apply and no slip). Things that effect the TC for example if there's an incorrect bonding process of the clutch lining and its cured to hard it can chatter or shutter. Flatness of the lining is also important cause the lining it's self acts as 1 of the seals for the piston. Fluid type / formulation can affect the operation also. Example, the Chrysler units from the late 70's through out mid to late 80's. you ran a chance of having a shutter (washboard dirt road feeling) if you used DEX 3 fluid. Literally draining the fluid and replacing it with Mopar 7176 fluid corrected this issue 100% of the time.
I have a 2015 Z06 with the A8. I been a transmission repairman for 30 years this year. When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't. Now if I drive it more frequently, it doesn't have the drain back issue and the adaption stored in memory doesn't have any weird side effects. It doesn't bother me however and I did mention it in a survey I got from GM (I also stated it doesn't bother me but its not right either). I do like the gear splits a lot better over the A6. Now the only issues I have had is the TCC apply seems a bit bouncy (shutter) and on occasion I get some odd shifting adaption feelings usually returning into 1st gear. I'm guessing (I will ask on my next oil change) that there's probably some software updates out at this point. On a side note I drive fairly mellow most of the time, but when I get a wild hair going I drive it like I stole it and THOROUGHLY impressed. Things take time to sort out and my hats off to GM for the eagerness to make and build there own trans over contracting with ZF or another source to make it. I remember the days when the 700R4 came out in 1982 and how all the guff over that trans mounted up but what most of the public didn't realize is it was a major replacement coverage over other models like 400 / 350C / 250C and 200C AND the S-10 came out also. Some of the stuff I randomly read here I will also ask about the next time I'm at the service dept.
***UPDATE***
I took the car in for an oil change, and asked the service writer to see if there was a software update and addressed my concern about the 2-1 downshift random bind. When I picked up my car from service, he told me that there was not a service update for the software, however, they reset the adapts and relearned the 2-1 downshift scheduling. This helped a lot.
Adding this part to this post. Someone mentioned they had there TC replaced and the shifting is still hard. (Refer to above about adapt info). The TC only transmits power from the engine to the transmission. To help clear up some issues others have mentioned about subtle RPM changes and whatnot, when parameters are met. IE like minimum road speed / TPS angle and so on, the command for TCC apply is commanded. The TCM tries to maintain aprox. a 60 rpm slip in the TC and this is why you will see a slight momentary blip in the RPMs when a slight throttle change is seen cause the load has changed and the TCM is adjusting the duty cycle to re-achieve that 60 RPM window. In most cases once the road speed is 55+ it will be commanded to 100% duty (full apply and no slip). Things that effect the TC for example if there's an incorrect bonding process of the clutch lining and its cured to hard it can chatter or shutter. Flatness of the lining is also important cause the lining it's self acts as 1 of the seals for the piston. Fluid type / formulation can affect the operation also. Example, the Chrysler units from the late 70's through out mid to late 80's. you ran a chance of having a shutter (washboard dirt road feeling) if you used DEX 3 fluid. Literally draining the fluid and replacing it with Mopar 7176 fluid corrected this issue 100% of the time.
Burning Brakes
Joined: Jul 2015
Posts: 920
Likes: 87
My Aug 2015 had hard 1st -2nd. shift when cold and jolt down shift 2nd -1st. when stopping ..at 600 miles had tech do re-learn on computer ...so far so good 1200 miles ...
Burning Brakes
Joined: Jul 2004
Posts: 1,032
Likes: 173
From: Upstate NY
Burning Brakes
Joined: Oct 2001
Posts: 983
Likes: 23
From: Northeast Ohio
When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't.
I do have a question related to the aeration. Once it's aerated and that fluid has been pumped onto the various servos, chambers, etc, the only way to get it out of those cavities is to cycle through the various control circuits affected correct?
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,010
Likes: 12,395
From: NE South Carolina
I brought this posting over from the other "A8" thread.
I have a 2015 Z06 with the A8. I been a transmission repairman for 30 years this year. When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't. Now if I drive it more frequently, it doesn't have the drain back issue and the adaption stored in memory doesn't have any weird side effects. It doesn't bother me however and I did mention it in a survey I got from GM (I also stated it doesn't bother me but its not right either). I do like the gear splits a lot better over the A6. ....
The TC only transmits power from the engine to the transmission. To help clear up some issues others have mentioned about subtle RPM changes and whatnot, when parameters are met. IE like minimum road speed / TPS angle and so on, the command for TCC apply is commanded. The TCM tries to maintain aprox. a 60 rpm slip in the TC and this is why you will see a slight momentary blip in the RPMs when a slight throttle change is seen cause the load has changed and the TCM is adjusting the duty cycle to re-achieve that 60 RPM window. In most cases once the road speed is 55+ it will be commanded to 100% duty (full apply and no slip). Things that effect the TC for example if there's an incorrect bonding process of the clutch lining and its cured to hard it can chatter or shutter. Flatness of the lining is also important cause the lining it's self acts as 1 of the seals for the piston. Fluid type / formulation can affect the operation also. Example, the Chrysler units from the late 70's through out mid to late 80's. you ran a chance of having a shutter (washboard dirt road feeling) if you used DEX 3 fluid. Literally draining the fluid and replacing it with Mopar 7176 fluid corrected this issue 100% of the time.
I have a 2015 Z06 with the A8. I been a transmission repairman for 30 years this year. When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't. Now if I drive it more frequently, it doesn't have the drain back issue and the adaption stored in memory doesn't have any weird side effects. It doesn't bother me however and I did mention it in a survey I got from GM (I also stated it doesn't bother me but its not right either). I do like the gear splits a lot better over the A6. ....
The TC only transmits power from the engine to the transmission. To help clear up some issues others have mentioned about subtle RPM changes and whatnot, when parameters are met. IE like minimum road speed / TPS angle and so on, the command for TCC apply is commanded. The TCM tries to maintain aprox. a 60 rpm slip in the TC and this is why you will see a slight momentary blip in the RPMs when a slight throttle change is seen cause the load has changed and the TCM is adjusting the duty cycle to re-achieve that 60 RPM window. In most cases once the road speed is 55+ it will be commanded to 100% duty (full apply and no slip). Things that effect the TC for example if there's an incorrect bonding process of the clutch lining and its cured to hard it can chatter or shutter. Flatness of the lining is also important cause the lining it's self acts as 1 of the seals for the piston. Fluid type / formulation can affect the operation also. Example, the Chrysler units from the late 70's through out mid to late 80's. you ran a chance of having a shutter (washboard dirt road feeling) if you used DEX 3 fluid. Literally draining the fluid and replacing it with Mopar 7176 fluid corrected this issue 100% of the time.
Great info, learned a lot! Didn't realize auto trans torque converters have come this far from the dumb one in my TH400 that sits behind the 8.2 Liter BB in my ProStreet Rod!
Last edited by JerryU; Aug 16, 2016 at 10:07 AM.
Burning Brakes
Joined: Jul 2015
Posts: 920
Likes: 87
GM monitors this forum ..
If GM had the A8 issues resolved it would have been posted ...
Some owners have had their cars ripped apart ...repairs made ..and still had issues...
Draw your own conclusions as you should with all significant purchases..
My opinion buy a manual or don't buy at all ...
Pro
Joined: Sep 2014
Posts: 701
Likes: 179
From: Muskoka ontario
I brought this posting over from the other "A8" thread.
I have a 2015 Z06 with the A8. I been a transmission repairman for 30 years this year. When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't. Now if I drive it more frequently, it doesn't have the drain back issue and the adaption stored in memory doesn't have any weird side effects. It doesn't bother me however and I did mention it in a survey I got from GM (I also stated it doesn't bother me but its not right either). I do like the gear splits a lot better over the A6. Now the only issues I have had is the TCC apply seems a bit bouncy (shutter) and on occasion I get some odd shifting adaption feelings usually returning into 1st gear. I'm guessing (I will ask on my next oil change) that there's probably some software updates out at this point. On a side note I drive fairly mellow most of the time, but when I get a wild hair going I drive it like I stole it and THOROUGHLY impressed. Things take time to sort out and my hats off to GM for the eagerness to make and build there own trans over contracting with ZF or another source to make it. I remember the days when the 700R4 came out in 1982 and how all the guff over that trans mounted up but what most of the public didn't realize is it was a major replacement coverage over other models like 400 / 350C / 250C and 200C AND the S-10 came out also. Some of the stuff I randomly read here I will also ask about the next time I'm at the service dept.
***UPDATE***
I took the car in for an oil change, and asked the service writer to see if there was a software update and addressed my concern about the 2-1 downshift random bind. When I picked up my car from service, he told me that there was not a service update for the software, however, they reset the adapts and relearned the 2-1 downshift scheduling. This helped a lot.
Adding this part to this post. Someone mentioned they had there TC replaced and the shifting is still hard. (Refer to above about adapt info). The TC only transmits power from the engine to the transmission. To help clear up some issues others have mentioned about subtle RPM changes and whatnot, when parameters are met. IE like minimum road speed / TPS angle and so on, the command for TCC apply is commanded. The TCM tries to maintain aprox. a 60 rpm slip in the TC and this is why you will see a slight momentary blip in the RPMs when a slight throttle change is seen cause the load has changed and the TCM is adjusting the duty cycle to re-achieve that 60 RPM window. In most cases once the road speed is 55+ it will be commanded to 100% duty (full apply and no slip). Things that effect the TC for example if there's an incorrect bonding process of the clutch lining and its cured to hard it can chatter or shutter. Flatness of the lining is also important cause the lining it's self acts as 1 of the seals for the piston. Fluid type / formulation can affect the operation also. Example, the Chrysler units from the late 70's through out mid to late 80's. you ran a chance of having a shutter (washboard dirt road feeling) if you used DEX 3 fluid. Literally draining the fluid and replacing it with Mopar 7176 fluid corrected this issue 100% of the time.
I have a 2015 Z06 with the A8. I been a transmission repairman for 30 years this year. When I first got the car I noticed (and it still does it) if I don't drive it for 4+ days the converter drains back and if you start it and don't run it 15-30 sec and just drop it in gear it doesn't move till the converter is recharged. Is this a problem? not really, however in this day and age it shouldn't be a problem. What I can say though since its an adaptive trans, recharging the converter creates aeration within the fluid and this can cause adaption issues since air compresses and oil doesn't. Now if I drive it more frequently, it doesn't have the drain back issue and the adaption stored in memory doesn't have any weird side effects. It doesn't bother me however and I did mention it in a survey I got from GM (I also stated it doesn't bother me but its not right either). I do like the gear splits a lot better over the A6. Now the only issues I have had is the TCC apply seems a bit bouncy (shutter) and on occasion I get some odd shifting adaption feelings usually returning into 1st gear. I'm guessing (I will ask on my next oil change) that there's probably some software updates out at this point. On a side note I drive fairly mellow most of the time, but when I get a wild hair going I drive it like I stole it and THOROUGHLY impressed. Things take time to sort out and my hats off to GM for the eagerness to make and build there own trans over contracting with ZF or another source to make it. I remember the days when the 700R4 came out in 1982 and how all the guff over that trans mounted up but what most of the public didn't realize is it was a major replacement coverage over other models like 400 / 350C / 250C and 200C AND the S-10 came out also. Some of the stuff I randomly read here I will also ask about the next time I'm at the service dept.
***UPDATE***
I took the car in for an oil change, and asked the service writer to see if there was a software update and addressed my concern about the 2-1 downshift random bind. When I picked up my car from service, he told me that there was not a service update for the software, however, they reset the adapts and relearned the 2-1 downshift scheduling. This helped a lot.
Adding this part to this post. Someone mentioned they had there TC replaced and the shifting is still hard. (Refer to above about adapt info). The TC only transmits power from the engine to the transmission. To help clear up some issues others have mentioned about subtle RPM changes and whatnot, when parameters are met. IE like minimum road speed / TPS angle and so on, the command for TCC apply is commanded. The TCM tries to maintain aprox. a 60 rpm slip in the TC and this is why you will see a slight momentary blip in the RPMs when a slight throttle change is seen cause the load has changed and the TCM is adjusting the duty cycle to re-achieve that 60 RPM window. In most cases once the road speed is 55+ it will be commanded to 100% duty (full apply and no slip). Things that effect the TC for example if there's an incorrect bonding process of the clutch lining and its cured to hard it can chatter or shutter. Flatness of the lining is also important cause the lining it's self acts as 1 of the seals for the piston. Fluid type / formulation can affect the operation also. Example, the Chrysler units from the late 70's through out mid to late 80's. you ran a chance of having a shutter (washboard dirt road feeling) if you used DEX 3 fluid. Literally draining the fluid and replacing it with Mopar 7176 fluid corrected this issue 100% of the time.
Racer
Joined: Jul 2012
Posts: 385
Likes: 26
From: Cape Cod
Really wanted a A8 this time. Not sure if I should keep reading or just go with the M7. Hoping the 2017 A8's are fixed but who knows. Can't deal with spending a bunch of money and having tranny issues.