A8 woes
Burning Brakes
Joined: Nov 2016
Posts: 774
Likes: 91
I know but I went back to see what it was. They complain about different stuff along with getting a re flash at the dealers. Some were TC's thumping and all. Getting new TC's WITHOUT any problems afterwards. I just want to help plus my girlfriend keeps mentioning how much see would like to drive an automatic...
Last edited by 2fastnow; Apr 11, 2017 at 10:27 AM.
Burning Brakes
Joined: Nov 2016
Posts: 774
Likes: 91
I know but I went back to see what it was. They complain about different stuff along with getting a re flash at the dealers. Some were TC's thumping and all. Getting new TC's WITHOUT any problems afterwards. I just want to help plus my girlfriend keeps mentioning how much see would like to drive an automatic...
Drifting
Joined: Jun 2009
Posts: 1,287
Likes: 448
From: Upstate NY
The key to this puzzle is for all of you tech/motor heads out there is to figure out what does the C7/A8 have different than any happy go lucky Silverado A8, Camaro A8 etc. Their numbers are way higher with no big problems.
I think it's electron more than TC exchanges. Others here have said the same thing. Problems still lerking AFTER a new TC put in. I don't believe the tranny is ONLY bad in Vettes but OK in other GM vehicles!
It's got to be a gizmo glitch.
I think it's electron more than TC exchanges. Others here have said the same thing. Problems still lerking AFTER a new TC put in. I don't believe the tranny is ONLY bad in Vettes but OK in other GM vehicles!
It's got to be a gizmo glitch.
Burning Brakes
Joined: Nov 2016
Posts: 774
Likes: 91
I have a 2015 GMC CC Denali with 6.2 A8 and 4 cylinder eco, so I'm on the GM trucks site as much as here and see as many treads on there about the shudder and other problems that generate the same type of hate the A8 threads. At about 1,500 miles I had a down shift problem, slam downshifted 2-1 especially when going slow. They did a re program etc. and it is still fine at 18k miles.
Intermediate
Joined: Nov 2015
Posts: 29
Likes: 2
A8 Woes
My 2015 vert gave me some of the same issuses. The little sudder and then the RPM changes of about 100 to 200 RMP back and forth. I brought it in and the dealer change out the TC. It has been like a different car since. Before I was alway listening and watching but now I drive and just enjoy. It has made a world of difference. Hope you get yours taken care of and enjoy as well.
Heel & Toe
Joined: Feb 2015
Posts: 21
Likes: 1
From: Isle of Palms SC
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Safety Car
Joined: Jun 2003
Posts: 4,250
Likes: 656
From: San Diego Ca
It is possible maybe probable we are combining 2 separate issues. One is a failing TC due to a leaking oil seal and the other is normal but seemingly abnormal issue of the car going from V8 to V4 mode with V4 mode having the TC open and close its lockup as a balance solution.
If your TC is going to fail you likely will know it and it will exhibit symptoms much greater than +/- 60 or 100 rpm fluctuations.
If the slight fluctuations in rpm due to V4 mode bother you than get a Range Tech AFM disabler or use M. I did both. And now exclusively use M mode in my car. So if somebody wants to try the Range solution pm me. I will sell mine to you so you can try it inexpensively.
If your TC is going to fail you likely will know it and it will exhibit symptoms much greater than +/- 60 or 100 rpm fluctuations.
If the slight fluctuations in rpm due to V4 mode bother you than get a Range Tech AFM disabler or use M. I did both. And now exclusively use M mode in my car. So if somebody wants to try the Range solution pm me. I will sell mine to you so you can try it inexpensively.