C7 transmission

Reply Subscribe

Thread Tools

Search this Thread

Sep 3, 2019 | 03:04 PM

Maud

Thread Starter

2nd Gear

Joined: Sep 2019

Posts: 2

Likes: 0

C7 transmission

My 2015 z51 automatic has a very slow sloppy shift from 1st to 2nd gear. Dealer has reprogrammed 4 times. Still terrible. What is the fix.

Sep 3, 2019 | 03:18 PM

Flame Red

Le Mans Master

Joined: May 1999

Posts: 6,517

Likes: 1,303

From: Windermere FL

You mean 1-2 slow when the engine is cold, right? Not when the engine is at normal operating temp. Nature of the beast - that is how it is. Snappy once the car is fully warmed up.

Sep 3, 2019 | 03:23 PM

speed4tu

Drifting

Joined: Nov 2016

Posts: 1,323

Likes: 420

From: Eastern NC

I traded my 2016 A8 equipped one for a 2018 M7. That seemed to fix my issues.

Sep 3, 2019 | 03:46 PM

captain vette

Safety Car

Joined: Dec 2015

Posts: 3,947

Likes: 1,407

From: Canada

Quote:

Originally Posted by speed4tu

I traded my 2016 A8 equipped one for a 2018 M7. That seemed to fix my issues.

well done ! nothing can beat a MT equipped car.

Sep 3, 2019 | 03:46 PM

JonMN

Safety Car

Joined: May 2016

Posts: 4,491

Likes: 1,028

From: MN

I had a 2016 A8 for 3 years. Little by little I went to using M mode all the time. It takes time to get used to this, as there really seem to be optimum shift points. Not counting WOT which is fun but impractical most of the time. I found the 1-2 shift to be fast and smooth if you either shifted right away once you get moving (even if as low as 1 to 1.5K RPM or so) or, it was also quick if you were accelerating quickly and shifted at over 2.5 K or so. It would really hang if you hit the wrong RPM in between, With time it got to be a reflex and I got pretty good at it. M mode can be a lot of fun. If you are passing, for example, hold down the downshift paddle and it drops to the lowest safe gear. Manual downshifting for curves is also a blast.

(Then I took the approach of speed4tu above and traded for a 2019 GS M7 . . .)

Last edited by JonMN; Sep 3, 2019 at 03:47 PM.

Sep 3, 2019 | 04:17 PM

MMD

Safety Car

Joined: Mar 2018

Posts: 4,754

Likes: 1,650

TSB 19-NA-121 which came out July 9 2019 fixes this issue, as well as the well known A8 shudder problem, I am having with my vehicle and will be in for service at my local Chevy Thursday to fix this shifting problem. They will perform a flush as well as replace with a new synthetic tranmission oil. Should take around 3-4 hours to do. Strongly recommend you change over to the new fluid. The new transmission fluid is a more robust fluid than the old oil they had been using prior to February 1, 2019.