rogergcam

I have a '15 Z51. Yesterday when cursing at 65, the engine started to "surge". The RPM's would change a few hundred, the oil pressure went to 25 to maybe 65 and back and forth, and the sound from the exhaust was also surging. The cars speed remained constant. It was in V4 mode. This went on for maybe 2 minutes
I stopped to turn around and go to the dealer, and the problems stopped.
Im taking it in this afternoon..Any thoughts..anyone have a similar problem?

Thanks

Formula52

Is it an A8? Also how many miles on it? Hate to tell you this, but if an A8, could be the tranny. A known issue and a new A8 tranny was put in all Vettes in Oct. 2015. Hope it works out for you. Best of luck with GM...

Red C8 of Jax

You have the exact same problem as I have with my 2015 A8. Noticed the problem at around 9K miles. Took it to the dealer and they said the cause was a bad o-ring in the torque converter. New torque converter ordered. Also, there were two (2) 2015 A8 torque converter orders ahead of mine that were diagnosed with the same problem. I was told the 2016 transmissions have a different part number than the 2015. Hopefully GM has solved the torque converter problem and the 2016's want have this problem when they get around 10K miles.

rogergcam

Sorry-its an A* with about 12500 miles....

Red C8 of Jax

When you have it in cruise control you should notice the shudder all the time.

Mike6811

Probably not a good idea to curse at any speed...



________________________________________ _____-

"Back to the wall goes Berra, it is...over the fence, homerun, the Pirates win!!"

\Boost Monkey/

Another one?

Curahee

Another confirmation that AFM is bad news. (IMO)

Red C8 of Jax

OP let us know what the dealer says about your problem. The first dealer I took my car to said there was no problem with my transmission. As I mentioned, the second dealer had ordered new torque converters for two other A8s with the same problem and knew exactly what was causing my transmission to shudder.

eboggs_jkvl

AFM or A8?


I'm thinking A8.


Elmer

bob guzzy

I'm not doubting that it is the transmission, but by any chance have you had the air intake off before the problem started?

A loose air coupling can cause a surge like feeling, I hope its something simple.

bbcb

just my luck ...my build was August 2015 so I have this crap to look forward to ! And as i put few miles on the car ...when the tranny does need replacement ...it will be out of warranty ! just great !

first GM product in 40 years ..... and this is the reason why !

eboggs_jkvl

Isn't the drive train a 5 year warranty? If you can't do enough miles in 5 years to get the A8 in trouble, you need to loan your car to a teenager!

I've got 11,150 on my '14 (A6) 5.5K a year isn't driving it to death but it's not parked in the garage a lot either!


Elmer

Black&White

Sorry to say, but it looks like you also have a bad A8 transmission. Sorry to have to welcome you to this club! Sorry to be the POOPER!
The surging you feel is loss of fluid to the T/C and the transmission trying to compensate for the slippage due to the lack of the proper amount fluid pressure in the T/C. I can't help but think this is going to turn into a major recall sometime in the future.






.

Black&White

Me thinks sooner or later they will all Grenade. A bad design is a bad design no one owns a "special" good one. (except for the new design) Like I said above Its going to slowly become an epidemic that GM will have to address with a recall. Look at the below links. The Boys and Girls with Cadillacs and GMC trucks are also having similar issues.

http://www.cadillacforums.com/forums...e-8-speed.html

http://www.silveradosierra.com/ecote...333770-30.html

PatriotsGuy

Had granny problems with my 08 c6 a6 coupe. Inexcusable

bbcb

i hope you are right .... and they do a recall .....

kp

Other things can cause a surge, not just the trans/TC.

But look at the bright side if you are a low miler, GM techs will get plenty of practice in the next few years swapping them out and GM may actually stumble upon a fix in the future. Unless the car stops moving or it acts really bad I'm not letting them touch my brand new car. An occasional downshift jolt or being able to feel the converter lock/unlock at 70mph when I'm driving like a granny is not a reason to let a dealer take a stab at replacing my trans - I have no problems when i am driving the car hard or its in manual mode.

Maybe after 3-4 years I'll let them try, or maybe if the torque tube, coupler or flex plate dies I'll complain and they can swap the trans at the same time

bbcb

this c7 may be finding it's way to a used car lot ...sooner than I had hoped ..

HANNY

doesn't sound like trans. sounds like
V4 going in and out of that mode