C7 Transmission
Thread Starter
4th Gear
Joined: Oct 2017
Posts: 4
Likes: 0
From: Homosassa, FL
C7 Transmission
2015 transmission sometimes does not want to engage when cold; same 2015 transmission sometimes engages as if the engine revs were up when put in gear (very hard engagement). I guess it depends upon mood transmission is in when it wakes up. Torque converter replaced twice, transmission replaced once. If I drive it quite often, problem is lessened, but not eliminated. If I don't drive it for several days, either problem will occur.
Racer
Joined: Apr 2023
Posts: 287
Likes: 129
From: Metro Detroit
I haven't had this issue on my 2015 but I notice when I start my car the RPMs are at 800 for a minute. I wait until it settles before I put it in gear. Have you had the triple flush with new fluid?
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I was going to say ensure the triple flush has been performed on the car. That procedure has helped many A8 transmissions (2015-2018 or 2019)
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,727
From: Atlanta GA
Valvebody leak down issue or have dealer perform the garage relearn procedure , this issue is well known and like states above there are a few TSB's issued ( TSB does not = Warranty)
Dave
Dave
Melting Slicks
Joined: Jan 2015
Posts: 2,104
Likes: 949
From: Fleming Island Florida
FYI, the triple flush is a TSB intended to remedy the shudder issue. There’s a different TSB for the “Harsh or Delayed Engagement from Park” problem. Sadly, this fix is way more costly than the triple flush.
Check this out:
https://www.corvetteactioncenter.com...rint-1290.html
Check this out:
https://www.corvetteactioncenter.com...rint-1290.html
Last edited by stevettec7; Sep 10, 2023 at 09:51 AM.
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,727
From: Atlanta GA
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Melting Slicks
Joined: Jan 2015
Posts: 2,104
Likes: 949
From: Fleming Island Florida
We could all speculate ‘til the cows come home. Maybe the firmware in the TCM is loosing its mind. I suppose one way to find out is to replace the TCM and reprogram it. Certainly less expensive than having the maintenance outlined in the TSB performed.
Thread Starter
4th Gear
Joined: Oct 2017
Posts: 4
Likes: 0
From: Homosassa, FL
A “Reset Adaptives” and “Relearn” has been my temporary fix for years now. I’m at the point where IF mine was a leak-down problem, why would it take MONTHS for the symptoms to return?
We could all speculate ‘til the cows come home. Maybe the firmware in the TCM is loosing its mind. I suppose one way to find out is to replace the TCM and reprogram it. Certainly less expensive than having the maintenance outlined in the TSB performed.
We could all speculate ‘til the cows come home. Maybe the firmware in the TCM is loosing its mind. I suppose one way to find out is to replace the TCM and reprogram it. Certainly less expensive than having the maintenance outlined in the TSB performed.