A8 question
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,053
Likes: 194
From: So Cal
A8 question
Got a question with the A8. Has anyone noticed that after the C/7 sets for a few hours that when you start it up and put it in drive there is a time delay until the transmission engages. I had my 2015 in for regular service and asked the service writer if he had any service alerts for the A/8. he said no. 
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Discussed ad nauseum. Search A8 and you will be inundated with numerous threads. Also TSBs that your dealer should have.
Last edited by rmorin1249; Feb 22, 2017 at 07:06 PM.
Safety Car
Joined: Sep 2001
Posts: 4,496
Likes: 1,264
From: Jacksonville FL
If it also delays when cold, you probably need a new torque converter. Delays going into gear is one of the symptoms of a bad torque converter. Check thread "A8's and Torque Converter Failure" for the other symptoms of a bad TC.
Melting Slicks
Joined: Apr 2015
Posts: 2,353
Likes: 779
I had the issue...there are multiple possible fixes. Some work for some people and others for other people. Here is best/easiest to worst/hardest:
1. Transmission control module reprogram only.
2. Stator shaft replacement with check ball added in torque converter.
3. Complete replacement of torque converter.
4. Complete replacement of transmission.
1. Transmission control module reprogram only.
2. Stator shaft replacement with check ball added in torque converter.
3. Complete replacement of torque converter.
4. Complete replacement of transmission.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
If you can't duplicate the delay symptoms at the dealer they will likely not get authorization from GM to repair it. My car recently had the TC replaced and although the tranny was out of the car they wouldn't fix the delay issue because the dealer couldn't verify it, even though it is a known problem with this tranny. If it gets worse they'll need to remove the tranny again. Go figure. I'm hoping the new TC and new fluid chemistry will magically fix the delay issue, too, but even if it doesn't the problem is little more than a quirky irritation I must endure every three months or so. In my case the delay is 5-10 seconds, then it won't do it again until the next episode.
BTW, a TCM software update done about a year ago did not fix my delay issues.
Last edited by iclick; Feb 22, 2017 at 07:58 PM.
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Instructor
Joined: Dec 2014
Posts: 184
Likes: 29
From: Mississauga Ontario
If you read the threads, you will find one that explains that the A8 is "self-learning",, and that the "lurch" between 1st and 2nd at start-up is common.
Doesn't mean anything is wrong. Doesn't mean it requires service.
And it does go away after a while.
Doesn't mean anything is wrong. Doesn't mean it requires service.
And it does go away after a while.
Melting Slicks
Joined: Apr 2015
Posts: 2,353
Likes: 779
I would re-read the OP.
Racer
Joined: Aug 2008
Posts: 335
Likes: 35
From: SW Utah
A8
Had that issue along with delayed shifting, 1-2 and 2-3. Dealer installed a new TC. Had it back a few days and noticed oil spot on drive. Leaking rear end. Still had 2-3 delayed (hard shift). This time they repaired the leak and GM engineers told them to add new program. Had it back for ~ 1 week now and seems good so far. They were working to sell me a new Z-06, I told them that I may go buy a Dodge HellCat if I still have problems with this one. Mine started acting up around 9K I had the TC replaced at 16K. I drive 130 miles one way to the dealer. They do give me a nice loaner. 