2015 Z51 transmission issues
Thread Starter
Cruising
Joined: Dec 2015
Posts: 14
Likes: 2
2015 Z51 transmission issues
So yesterday I go to leave work and when I put the car in Drive it hesitated for about 4 seconds then banged into gear. It lunged the car forward even with the brake on.
This morning I backed out of garage and when I put into Drive it seemed fine till I went to go forward and it was as if it was in neutral for a short period. Maybe 2 seconds. Anyone experienced this in there car.
Thanks
This morning I backed out of garage and when I put into Drive it seemed fine till I went to go forward and it was as if it was in neutral for a short period. Maybe 2 seconds. Anyone experienced this in there car.
Thanks
Racer
Joined: Feb 2014
Posts: 258
Likes: 17
Its a fairly common problem. Bring it into the dealership and get them to reflash it. I've done it a few months back and now its occurring again. The car is currently at the dealership with an engine light and I told them about varies transmission problems. Ill get back to you about the violent shift.
Advanced
Joined: Dec 2014
Posts: 78
Likes: 0
From: Elk Wa
Same happened on both of our transmissions. They reflashed. But they also said it comes from it "learning" how we want to shift....and we "might" spend a lot of time hammering it...lol. They say it's based on the way you drive it.
Melting Slicks
Joined: Feb 2006
Posts: 2,261
Likes: 1,431
From: Brentwood CA
Much discussion about issues such as this in the General Discussion area. It appears there is a torque converter issue with the A8 and the symptoms you mention may be early signs that you are having an issue with it. A few links below: 
https://www.corvetteforum.com/forums...ifference.html
https://www.corvetteforum.com/forums...r-failure.html
https://www.corvetteforum.com/forums...a8-issues.html
https://www.corvetteforum.com/forums...ifference.html
https://www.corvetteforum.com/forums...r-failure.html
https://www.corvetteforum.com/forums...a8-issues.html
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
My 12/18/14 build did this until I had the dealer flash the TCM and perform the "fast relearn" procedure back in November. Now it upshifts great under all conditions.
Last edited by iclick; Feb 13, 2016 at 09:50 AM.
Instructor
Joined: Mar 2015
Posts: 238
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From: FL
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Pro
Joined: Sep 2014
Posts: 701
Likes: 179
From: Muskoka ontario
* If your car was built Sept 29th or later you can take it to the dealer and they will perform the fast learn in the service bay......easy
* For 2015 C7 ,A8's built PRIOR TO SEPT 29TH,2014, you will need to get the service manager to give you a copy of GM 14-07-30-001C and do the very lengthy drive procedure OR have the dealership do it.....not so easy !
* For 2015 C7 ,A8's built PRIOR TO SEPT 29TH,2014, you will need to get the service manager to give you a copy of GM 14-07-30-001C and do the very lengthy drive procedure OR have the dealership do it.....not so easy !
Racer
Joined: Aug 2007
Posts: 354
Likes: 101
From: Louisville Ky
* If your car was built Sept 29th or later you can take it to the dealer and they will perform the fast learn in the service bay......easy
* For 2015 C7 ,A8's built PRIOR TO SEPT 29TH,2014, you will need to get the service manager to give you a copy of GM 14-07-30-001C and do the very lengthy drive procedure OR have the dealership do it.....not so easy !
* For 2015 C7 ,A8's built PRIOR TO SEPT 29TH,2014, you will need to get the service manager to give you a copy of GM 14-07-30-001C and do the very lengthy drive procedure OR have the dealership do it.....not so easy !
Last edited by red 1; Feb 14, 2016 at 04:11 PM.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
The reference I've referred to in the past is PI1473, but the link I had for it no longer works. I have these notes from that TSB:
Op-Code 2810175 Updated programming 2810175.5 ma9 0341 6589
As I understand it, the dealer's scan tool must be connected to the car's OBD2 port and it performs the relearn in the shop. I think the tech needs to interact with the scan tool during the procedure by changing the gear selector, etc. Also, the A8 fluid needs to be between 167° and 185° before the process can start. Since I've never seen mine get above 150° on the street, even in 100° summer weather, I'm not sure how they did it. I presume they stalled the converter in the shop to heat up the tranny.
Op-Code 2810175 Updated programming 2810175.5 ma9 0341 6589
As I understand it, the dealer's scan tool must be connected to the car's OBD2 port and it performs the relearn in the shop. I think the tech needs to interact with the scan tool during the procedure by changing the gear selector, etc. Also, the A8 fluid needs to be between 167° and 185° before the process can start. Since I've never seen mine get above 150° on the street, even in 100° summer weather, I'm not sure how they did it. I presume they stalled the converter in the shop to heat up the tranny.
Last edited by iclick; Feb 15, 2016 at 02:13 PM.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
Not so easy is an understatement, it takes miles and miles of uninterrupted highway and very little traffic to even try this procedure, a real joke created by GM. When the dealer service manager says whew I don't even want to try anymore of these you know it's a real pain in the a#$.
Lightly accelerate to 65 mph (105 km/h) and coast to
25 mph (40 km/h) (light braking can be applied). Repeat
10 times.
25 mph (40 km/h) (light braking can be applied). Repeat
10 times.
I presume if you interrupt the process along the way, like a stoplight or hard curve, you must start over. For those of you with older cars (built before 09/29/14), to see the TSB do a search here on "14-07-30-001A".
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
I need to post a clarification to my reply #7 above. I misread Boost Money's "slow shift" to mean the first 1-2 shift when cold, when he apparently referred to the first cold engagement of Drive. I've had a slow engagement into Reverse (~5 sec.) 1-2x every three months almost like clockwork, but the TCM software update and fast relearn did not fix this issue.