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I have a 2014 A6 Stingray with Range device installed and driven exclusively in Tour Mode\Drive mode. When coasting downhill in our Denver area foothills for extended distances, I may perform one or more paddle downshifts. The anomaly experienced with shifting begins after resuming Drive mode. Coming to a normal stop for a light, then going forward normally under gentle acceleration, the transmission does what is called 'flairing?' Meaning, that when in Drive and automatically shifting from 1st gear to 2nd, there is a brief (one second) gap between the 1st and 2nd gears where the engine revs as if not engaged in a gear. Anomaly may happen only once or at most a second time, from a stop, then it is gone. Issue does not ever happen if left in Drive Mode when coasting downhill.
The A6 transmission was flushed 5 years and 16000 miles ago at a Chevrolet dealer. What may be happening here? Thanks
It is also a good idea to look at TSB to see if anything related to your concern…so the RPM’s suddenly increase during this flair ??…unfortunately not a blown fuse so you may need to seek out a transmission shop.
Thanks for the reply. I'm quite confident the TSB is not my answer. As originally stated, the problem occurs once or twice ONLY after I manually downshift while in Drive Mode during a downhill run, followed by a stop sign and then a start going forward. I have NEVER experienced this issue under any other circumstances. I have never had this issue when coasting downhill in Drive Mode without first manually changing to a lower gear. The shifting is flawless in all other circumstances of normal driving, even following some occasional spirited canyon driving.
I have suspicions of a low ATF level causing this. No, there are no leaks.
When this happens, you never take it out of drive mode, just down shift a couple of gears with the paddle shifters?
Sorry, we posted at the same time.
I have a 2014 A6. I drive it in M mode all the time. When I slow down there isn't a need to use the paddle shifters to shift down, when I slow down. It will down shift very gentle. down to 2nd gear, not to 1st gear. In the 14 A6, there is no need to shift down to 1st to start out again. Just leave it in manual mode and start out in second. It works perfect. Now don't get me wrong, it i want to do a bit of sporty driving I will start out in 1st gear. But for just normal driving 2nd is just fine. This method is very gentle on the trans and cuts the number of shifts in half.
Take it to any competent trans shop or dealer and have the Garage Relearn Procedure done , then drive it like you stole it for the next 100 miles as it will be in learning mode . This is a common problem with adaptive learning transmissions .
I had to perform the relearn twice on my C6 A6 and once on my C7 A8
Dave
Then get it tuned... you'd be able to get rid of that Range device, since the AFM/DOD would be disabled the correct way via tuning... and the tranny can be tuned as well... shift points, quickness, firmness, etc etc...
I can definitely get you hooked up with a correct version programmer and custom tune for your Vette... I've done a thousand of these cars over the years...
You can email me directly for more info: diablo DOT help AT gmail DOT com
Then get it tuned... you'd be able to get rid of that Range device, since the AFM/DOD would be disabled the correct way via tuning... and the tranny can be tuned as well... shift points, quickness, firmness, etc etc...
I can definitely get you hooked up with a correct version programmer and custom tune for your Vette... I've done a thousand of these cars over the years...
You can email me directly for more info: diablo DOT help AT gmail DOT com
-Thanks!
-Lew
Lew , you know how i feel about your tunes , your engine tunes for a stock motor are spot on and while your tranny tunes are great ( heck i loved mine .... ) its the "trans adapts" that are causing the 1st to 2nd gear shift flair with the A6 and A8 adaptive learning TCMs . It also causes harsh engagement and banging on downshift.
You need a Tech II or GDS2 to clear adapts and put the TCM into the Garage Relearn Procedure which cycles the preasure that is needed to fully engage each clutch pack and also measures the pack release time , then over the next 100 miles you need to vary your driving style as it monitors the input shaft speed and compares it to the tailshaft speed making adjustments as needed to make the perfect shift everytime
Lew , you know how i feel about your tunes , your engine tunes for a stock motor are spot on and while your tranny tunes are great ( heck i loved mine .... ) its the "trans adapts" that are causing the 1st to 2nd gear shift flair with the A6 and A8 adaptive learning TCMs . It also causes harsh engagement and banging on downshift.
You need a Tech II or GDS2 to clear adapts and put the TCM into the Garage Relearn Procedure which cycles the preasure that is needed to fully engage each clutch pack and also measures the pack release time , then over the next 100 miles you need to vary your driving style as it monitors the input shaft speed and compares it to the tailshaft speed making adjustments as needed to make the perfect shift everytime
Dave
Meh... yeah, I can disable the adaptives too... but it's generally not a good idea...
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2014 A6 transmission temporary flair
