Well I took my car to the dealer because when I get on it at freeway speeds to pass other cars, it falls flat on it's face. Basically it's like giving it about 75% throttle and pushing the gear shift into neutral

When it happens it goes to about redline, no power to the rear wheels until it settles back down to around 3k rpm's and then the trans will engage again. When I dropped it off at the dealer, I left them with two pages of the TSB's relating to what seems to be my issue. I get a call back from the service advisor telling me "well, there's a little hesitation, but this is normal" I told her wait a minute, did you not even read the TSB about this issue? Her reply was that this condition is normal with these cars I said that was not acceptable and not "normal". They are keeping the car overnight to have a "supervisor" take a look tomorrow

I'm really pissed. Has anyone else experienced this symptom at all? I know it's related to the TSB's. Any ideas on how to handle the dealer and get them to acknowledge the TSB problem and make them fix this problem? It's still under the Bumper to Bumper warranty. I've opened a "file" with Chevy Customer Service. Any helpful suggestions are welcome. Thanks

 

Take your vette to a dealer who know how to repair cars. There are some very good dealers in the bay area.

 

Any suggestions on a dealer in the San Jose area? So many have closed in the past two years I don't know which one is any good.

 

I recently tuned my car and it helped allot ! I have an 07 A6 and I was experiencing same issue even on the street. I can't say it 100% went away but is so much better. Let me know what your results and findings are so I can do the same. I posted on this a month ago but got no responses as I couldn't really express in writting what was happening while I was driving. I would suggest having the mechanic at the dealership take the car out with you on the hwy and show them what you mean. If you don't mind can you fwd me the info that you have regarding this issue. Im sure its the same with LS2 LS3 . not sure if any chanages in the A6 tranny from 07 -08.
thx

 

Well, the stealership called and said they cannot duplicate the problem! The saga begins. I'm so pissed I can't see straight. I bet as soon as I get in the car I'll be able to duplicate the problem right away. They said without codes being thrown, they have nothing to go off of, which I honestly don't know if codes are being set for this condition or not; it would be nice to know. Anyone have an idea whether or not codes would be set for this transmission problem??

I also brought it in because the driver's side mirror defroster is busted. They couldn't fix that either. She said they've ordered the part. So after 2 entire days in the service dept., (that's a rather ironic name), nothing got fixed!! I guess this will just help build the file for Chevy Customer Service. I don't know why I'm surprised at any of this. This dealership is brand new, like two weeks old. I thought they'd really try to start off with a good rep in the local community.

Here's one link of many you can probably dig up on Google:

http://www.aboutautomobile.com/TSB/2...c+Transmission

You'll have to cut and paste, but it should take you right to the current TSB's for the A6 trans.

 

Sounds like normal behavior for the C6... the electronic nannies can be VERY intrusive.

For example, if the Traction Control System senses that the rear wheels are beginning to lose traction, it can reduce engine power by closing the throttle! Together with the Active Handling System, it also works the rear brakes to maintain traction & directional control.

Also, big & sudden throttle changes can confuse the A6 tranny -- especially if you're steering and AH intervenes.

That is, what gear should the A6 select when TC suddenly closes the throttle and AH starts working the brakes? Under the right conditions, it feels like it's in neutral until it can select an appropriate gear... this happened to me once on a 2-lane when I had to abort a pass.

All this can feel very disturbing... but not nearly as disturbing as spinning-out in traffic at freeway speeds.

Find a safe place to experiment with these (one at a time):
-- Put the shifter in "S".
-- Turn off TC.
-- Engage "Competitive Driving Mode" (this reduces AH & turns off TC).
-- Turn off AH (this also turns off TC).
-- Use the paddle-shifter to select a gear before you begin a freeway pass.
-- Try easing into the throttle rather than suddenly mashing it.

I like my shifter in 'S' and sometimes use COMP mode, especially if I'm using the paddles. Shifts are quicker and it feels more responsive. (Normally, the automatic shifts faster than the paddles, but the difference is minimal in COMP mode.)

Before you do anything else, take a look at pgs 4-6 to 4-9 in your owners manual: http://www.gmpartshouse.com/download...08corvette.pdf

And be careful, will ya?

 

This is all great info!! I alwys leave the AH on and I think I'm in comp mode most of the time but I will start to play around and see. I jsut changed to a K&N CAI with vette air scoop and did a tune and it kinda went away but just had the car out and I mashed the throttle. As I came off the throttle the car felt exactly like you described as if I shifted into neutral gear. its very strange. I think I understand why its happening but I don't like it. But If its gonna safe my life I'll deal with it
Thanks!

 

Take a ride down to RPM Motors and see Charlie, he will make you happy.

 

This is probably the best advice and from someone that sounds like they really understand the A6. I've only had the car for 2 months and I'm still learning. The dealers don't even know this info and without this knowledge it really does seem like something is wrong.

On my way to work this morning (40 miles of freeway), I put the car into Competition Mode. Guess what, problem solved!
If the dealers would bother educating themselves a little about the products they sell, it would really be a plus. That's in a dreamworld, I know

Thanks again for the tip as I would've pushed and pushed with the dealer and Chevy Customer Service and I've already wasted hours of my life talking til I'm blue in the face explaining the issue and ultimately getting absolutley nowhere. Have a great Holiday season!

 

Something else that's worthy of note is to understand exactly what's happening when you're on the freeway and punch it.

In the old school days of TH350 transmissions if you were on the freeway and step on the gas hard, the car would downshift from 3rd into 2nd (or 1st depending on exactly how fast you're going at the time) - no big deal.

With the 6L80 however, punching it on the freeway causes a 4 gear downshift and until just recently, even with turning off all Torque Management in your tune it wasn't possible to prevent TM from kicking in during this situation as it seems like GM knows people are turning off TM but decided to keep that little extra bit of protection in the trans.

HP Tuners just recently figured out how to override this but as somebody who is on his 8th 6L80 transmission, even with having that kind of control over the transmission I would never want my car to do that especially if I was on the freeway.

Something else you might have already noticed is that the more you put your foot into it the more the car will hesitate because less throttle on a downshift will cause it to drop by only 2 or 3 gears, something the car doesn't seem to mind. If you ever decide to have your car tuned the good news is that you can change your settings to match your driving style so that it either downshifts more easily and by fewer gears.

Hope that helps,
Christopher