Automatic downshifting on turns
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
Do you have to push the Corvette to its limits to the point of adhesion to get this downshifting? That is not My driving style I see no difference between this automatic or any other automatic. 
Burning Brakes
Joined: Oct 2005
Posts: 881
Likes: 0
From: San Diego Ca
Originally Posted by Datawiz
I've had a problem with mine since day one. If I take a turn hard, it's more like it goes into a false neutral and not a lower gear. I can sit and rev and rev the throttle with no acceleration for several hundred feet and 5 or more seconds. GM has never given me an answer. I think it's a flaw in the Performance Shift Algorithim (software)
Instructor
Joined: Feb 2005
Posts: 111
Likes: 0
From: Whittier California
Originally Posted by clem zahrobsky
over on pauls board it is posted about the reprogram what else can i say.
Hopefully, that means just a software download is needed.
Even if they drop the trans pan to adjust something, I'm OK with it since I'd make sure they change the supposedly "lifetime" trans fluid under warranty.
I'll post a note about the fix (and the TSB if I get a copy) after my dealer does his thing...
Instructor
Joined: Feb 2005
Posts: 111
Likes: 0
From: Whittier California
A6 is fixed!
My A6 was fixed by the dealer by downloading an updated program.
As noted above, there is a TSB on this.
Problem: My car acted like it had a high stall torque converter - it would have to "spool up" a bit before engaging a gear if I had to quickly go from reverse-neutral-drive. The engine would briefly spin as if it were in neutral, then bang into gear and hook up.
Also, during steady-speed cruising or on a slight downhill, the gas pedal connection to the engine would feel vague.
The cure is simple - The Chevy tech needs to locate the fuse box under the hood on the passenger side. Gently pull off the fuse panel lid to read things easier, look for the printed title "J-Style Fuses", and note the line underneath it that says "Fuse 31 - amp (30A). (This fuse is for the radio but does not say so!) He then pulls this fuse out of the fuse block, downloads/uploads the revised program by connecting the programmer under the driver's dash, puts the radio fuse back in and... done!
Don Steves Chevrolet in La Habra, Ca. was familiar with this problem and knew exactly what I was talking about even without a test drive. The car now has a more connected, tighter feel.
As noted above, there is a TSB on this.
Problem: My car acted like it had a high stall torque converter - it would have to "spool up" a bit before engaging a gear if I had to quickly go from reverse-neutral-drive. The engine would briefly spin as if it were in neutral, then bang into gear and hook up.
Also, during steady-speed cruising or on a slight downhill, the gas pedal connection to the engine would feel vague.
The cure is simple - The Chevy tech needs to locate the fuse box under the hood on the passenger side. Gently pull off the fuse panel lid to read things easier, look for the printed title "J-Style Fuses", and note the line underneath it that says "Fuse 31 - amp (30A). (This fuse is for the radio but does not say so!) He then pulls this fuse out of the fuse block, downloads/uploads the revised program by connecting the programmer under the driver's dash, puts the radio fuse back in and... done!
Don Steves Chevrolet in La Habra, Ca. was familiar with this problem and knew exactly what I was talking about even without a test drive. The car now has a more connected, tighter feel.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
Originally Posted by DaMayor
My A6 will spin uselessly and bang into gear if I'm trying to go from reverse-neutral-drive in a hurry when attempting to get out of someone's way in a parking lot, for example. It acts like the trans is low in fluid...but could be a programming issue. Other than that, the trans shifts perfectly while using exceptional logic.
This is a definite problem that needs to be candidly addressed by GM - but that's not been their style in the past...
This is a definite problem that needs to be candidly addressed by GM - but that's not been their style in the past...
Instructor
Joined: Feb 2005
Posts: 111
Likes: 0
From: Whittier California
Originally Posted by LS WON
First year transmission = nothing but problems
Simply put, the transmission can go into neutral when a quick change is asked for by the driver pressing the throttle pedal in an "off the gas - on the gas" situation such as taking a fast corner. It can happen when you are rapidly decellerating for a red light that suddenly turns green and you hit the throttle. I had it happen in a parking lot.
Relax...
Burning Brakes
Joined: Jun 2005
Posts: 829
Likes: 0
From: Of Mind
...A little confused
Originally Posted by DaMayor
Clem is correct. The mechanic site says "A revised transmission calibration has been released to address this issue".
Hopefully, that means just a software download is needed. ...
Hopefully, that means just a software download is needed. ...
I'm a little confused. The A4 & A6 problems sound similar, but actually quite different. Do I have it right that the A4, like Datawiz, revs loose after a hard corner. It hits a false neutral and tries to find its gear.
In contrast, the A6 problem is that it looses its gear in a rapid R N D shift.
There's a TSB on the A6 and a quick download fixes - but there's no fix for the A4 yet.
Have I got this right?
Thx!
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Racer
Joined: Sep 2004
Posts: 457
Likes: 2
From: Foothill Ranch CA
Update
I took my 05 A4 in for the NAV radio upgrade and also had them look into the trans problem. Long story short........ There is a manufacturing defect in the A4 that will cause the trans to starve itself for fluid when placed in a hard turn for any length of time. My car has had this occur twice when going through a 270-degree turn to the right with about .75 g's for about 10 seconds. Once I am straightened out and gun it to accelerate onto the freeway from about 40 MPH to what is typically about 80 MPH, the car starts to accelerate and is definitely hooked up, but then at about 70 MPH the car is simply revving out of control and no longer accelerating. I then need to back off on the pedal and then it seems to catch and I can accelerate once again and all is normal.
The dealer researched this quite extensively and basically said that it was a design flaw and that there was no fix at this time.
As a community, we all need to stick together to make this known so that they come up with a retrofit for the trans pan, or pickup, or ?? Some sort of a fix. If you have an 05 A4, your car is probably going to do this as well.
It would be interesting to see how many of us can replicate this and report back to this thread. If anyone has any contradictory information about this, please let me know.
The dealer researched this quite extensively and basically said that it was a design flaw and that there was no fix at this time.
As a community, we all need to stick together to make this known so that they come up with a retrofit for the trans pan, or pickup, or ?? Some sort of a fix. If you have an 05 A4, your car is probably going to do this as well.
It would be interesting to see how many of us can replicate this and report back to this thread. If anyone has any contradictory information about this, please let me know.
Burning Brakes
Joined: Jun 2005
Posts: 829
Likes: 0
From: Of Mind
Originally Posted by Lawman31
I took my 05 A4 in for the NAV radio upgrade and also had them look into the trans problem. Long story short........ There is a manufacturing defect in the A4 that will cause the trans to starve itself for fluid when placed in a hard turn for any length of time. My car has had this occur twice when going through a 270-degree turn to the right with about .75 g's for about 10 seconds. Once I am straightened out and gun it to accelerate onto the freeway from about 40 MPH to what is typically about 80 MPH, the car starts to accelerate and is definitely hooked up, but then at about 70 MPH the car is simply revving out of control and no longer accelerating. I then need to back off on the pedal and then it seems to catch and I can accelerate once again and all is normal.
The dealer researched this quite extensively and basically said that it was a design flaw and that there was no fix at this time.
As a community, we all need to stick together to make this known so that they come up with a retrofit for the trans pan, or pickup, or ?? Some sort of a fix. If you have an 05 A4, your car is probably going to do this as well.
It would be interesting to see how many of us can replicate this and report back to this thread. If anyone has any contradictory information about this, please let me know.
The dealer researched this quite extensively and basically said that it was a design flaw and that there was no fix at this time.
As a community, we all need to stick together to make this known so that they come up with a retrofit for the trans pan, or pickup, or ?? Some sort of a fix. If you have an 05 A4, your car is probably going to do this as well.
It would be interesting to see how many of us can replicate this and report back to this thread. If anyone has any contradictory information about this, please let me know.