8 speed issues
Thread Starter
Instructor
Joined: Jul 2015
Posts: 210
Likes: 32
From: Raleigh
8 speed issues
Just got heads ported, big *** cam and headers put on my car and 2 weeks later of course, the trans goes on me right after voiding my warranty! So far gm has been cool and said they cover it since mods didnt seem to be the cause for my issues. They just replaced the TCM thinking that was the fix. But its not.
What happened was i was actually driving 5mph under the speed limit waiting my turn to merge onto the eway. All of a sudden the rpm flies up to almost 7k rpm and no shift as i accelerate, putting it in manual, same results. The only gear that worked was park. Seems like the only problem was that the trans is not communicating with the rest of the onboard computers. Thought the TCM be the fix but found out today not so much.
Anybody else run into this? If so what was the cause and fix?
Crossing my fingers i get the new updated trans put in. But my luck is not that good. Hope they don't just put a band-aid on it.
What happened was i was actually driving 5mph under the speed limit waiting my turn to merge onto the eway. All of a sudden the rpm flies up to almost 7k rpm and no shift as i accelerate, putting it in manual, same results. The only gear that worked was park. Seems like the only problem was that the trans is not communicating with the rest of the onboard computers. Thought the TCM be the fix but found out today not so much.
Anybody else run into this? If so what was the cause and fix?
Crossing my fingers i get the new updated trans put in. But my luck is not that good. Hope they don't just put a band-aid on it.
Le Mans Master
Joined: May 1999
Posts: 6,517
Likes: 1,304
From: Windermere FL
Nice to hear that GM was doing you right!
My TCM went out with 100 miles on the clock back in June, but the symptoms were totally different. Car would backfire and give codes the bus could not talk to the TCM but the tranny would still shift hard like in limp home mode. At the time, GM would not permit field techs to disassemble the A8 for some reason, so they replaced the entire tranny even though the TCM is external.
It would be interesting to see if they gave you the "old" A8 or the "new" part number A8 that supposedly has the cure for the defective torque converter leak issue.
My TCM went out with 100 miles on the clock back in June, but the symptoms were totally different. Car would backfire and give codes the bus could not talk to the TCM but the tranny would still shift hard like in limp home mode. At the time, GM would not permit field techs to disassemble the A8 for some reason, so they replaced the entire tranny even though the TCM is external.
It would be interesting to see if they gave you the "old" A8 or the "new" part number A8 that supposedly has the cure for the defective torque converter leak issue.
Thread Starter
Instructor
Joined: Jul 2015
Posts: 210
Likes: 32
From: Raleigh
I bought my car in June too. Im sitting on the edge of my seat waiting to see how it plays out. I hope they dont a hard time. Its one thing for them to comp a $200 part, i just hope they don't change their mind if the whole tranny needs to be replaced and say its my problem now deal with it.
Can they go back on their word about covering said part when they already said its not my fault?
I just spent my tranny fixing money on the new msd intake and a ported throttle body.lol car was scheduled to go to the tuner shop this Thursday. Looks like I'll be canceling my appointment now.lol
Can they go back on their word about covering said part when they already said its not my fault?
I just spent my tranny fixing money on the new msd intake and a ported throttle body.lol car was scheduled to go to the tuner shop this Thursday. Looks like I'll be canceling my appointment now.lol
Drifting
Joined: Dec 2012
Posts: 1,630
Likes: 203
From: MI
I bought my car in June too. Im sitting on the edge of my seat waiting to see how it plays out. I hope they dont a hard time. Its one thing for them to comp a $200 part, i just hope they don't change their mind if the whole tranny needs to be replaced and say its my problem now deal with it.
Can they go back on their word about covering said part when they already said its not my fault?
I just spent my tranny fixing money on the new msd intake and a ported throttle body.lol car was scheduled to go to the tuner shop this Thursday. Looks like I'll be canceling my appointment now.lol
Can they go back on their word about covering said part when they already said its not my fault?
I just spent my tranny fixing money on the new msd intake and a ported throttle body.lol car was scheduled to go to the tuner shop this Thursday. Looks like I'll be canceling my appointment now.lol
If you have a problem or think they are being unfair you can sue .
Last edited by MikeLsx; Jan 26, 2016 at 03:03 PM.
Racer
Joined: May 2000
Posts: 453
Likes: 51
From: Stuart Florida
Thread Starter
Instructor
Joined: Jul 2015
Posts: 210
Likes: 32
From: Raleigh
They just pulled the trans from the car this afternoon, they are still going thru all the motions gm has them do before they determine if im getting a new trans or if they are going to try and fix it.
Racer
Joined: May 2000
Posts: 453
Likes: 51
From: Stuart Florida
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Thread Starter
Instructor
Joined: Jul 2015
Posts: 210
Likes: 32
From: Raleigh
I got good news! Transmission is getting replaced and on the Genral's dime! Thankfully
All the clutches were burned out.
I feel pretty lucky considering my car is heavily modified, they could have told me to kick rocks.
Might go buy a lotto ticket now.
Lesson learned.
Learned a lot about GM's warranty policy towards modifications in the process.
All the clutches were burned out.
I feel pretty lucky considering my car is heavily modified, they could have told me to kick rocks.
Might go buy a lotto ticket now.
Lesson learned.
Learned a lot about GM's warranty policy towards modifications in the process.
Thread Starter
Instructor
Joined: Jul 2015
Posts: 210
Likes: 32
From: Raleigh
Yes, stock converter.
First and foremost its Gm's decision, not necessarily the dealerships. Some dealers are "mod friendly" they decide not to share what was modified on the car when dealing with GM.
Secondly, your warranty isn't void because of modifications or being tuned. The part that failed needs to have failed due to the modification(s). My trans was tuned but Gm decided since the failure wasn't because of anything I had done to the car they replaced it at their expense.
Say for example, the power train warranty gets voided, that doesn't mean your whole warranty is void. If something with the infotainment system goes or the door release button doesn't work, dome light goes out etc.. it will still get fixed by GM.
Pretty much as long as whatever is done to the car aftermarket wise is not the direct reason for any part failure, GM would cover it.
That's how the warranty was explained to me by the dealership.
Hope this helps.
Eric
First and foremost its Gm's decision, not necessarily the dealerships. Some dealers are "mod friendly" they decide not to share what was modified on the car when dealing with GM.
Secondly, your warranty isn't void because of modifications or being tuned. The part that failed needs to have failed due to the modification(s). My trans was tuned but Gm decided since the failure wasn't because of anything I had done to the car they replaced it at their expense.
Say for example, the power train warranty gets voided, that doesn't mean your whole warranty is void. If something with the infotainment system goes or the door release button doesn't work, dome light goes out etc.. it will still get fixed by GM.
Pretty much as long as whatever is done to the car aftermarket wise is not the direct reason for any part failure, GM would cover it.
That's how the warranty was explained to me by the dealership.
Hope this helps.
Eric
5th Gear
Joined: Aug 2015
Posts: 5
Likes: 0
What cam do you have in the car and what brand ? Reason I am asking is cause I am in the process of my 416 build with ported heads and cam. When I ordered my cam head package on Friday from Texas speed they offer 4 cams the vvt-sv , vvt-1 , vvt-2 , vvt-3 ......when I told them it was a 2015 with the A8 they said oh we recommend the vvt-sv with the stock converter so you don't blow the tranny , as far as I know no one makes a stall converter for the A8 yet.
Burning Brakes
Joined: Apr 2010
Posts: 1,001
Likes: 37
From: Farmington Missouri
Yes, stock converter.
First and foremost its Gm's decision, not necessarily the dealerships. Some dealers are "mod friendly" they decide not to share what was modified on the car when dealing with GM.
Secondly, your warranty isn't void because of modifications or being tuned. The part that failed needs to have failed due to the modification(s). My trans was tuned but Gm decided since the failure wasn't because of anything I had done to the car they replaced it at their expense.
Say for example, the power train warranty gets voided, that doesn't mean your whole warranty is void. If something with the infotainment system goes or the door release button doesn't work, dome light goes out etc.. it will still get fixed by GM.
Pretty much as long as whatever is done to the car aftermarket wise is not the direct reason for any part failure, GM would cover it.
That's how the warranty was explained to me by the dealership.
Hope this helps.
Eric
First and foremost its Gm's decision, not necessarily the dealerships. Some dealers are "mod friendly" they decide not to share what was modified on the car when dealing with GM.
Secondly, your warranty isn't void because of modifications or being tuned. The part that failed needs to have failed due to the modification(s). My trans was tuned but Gm decided since the failure wasn't because of anything I had done to the car they replaced it at their expense.
Say for example, the power train warranty gets voided, that doesn't mean your whole warranty is void. If something with the infotainment system goes or the door release button doesn't work, dome light goes out etc.. it will still get fixed by GM.
Pretty much as long as whatever is done to the car aftermarket wise is not the direct reason for any part failure, GM would cover it.
That's how the warranty was explained to me by the dealership.
Hope this helps.
Eric
Drifting
Joined: Dec 2012
Posts: 1,630
Likes: 203
From: MI
Yes, stock converter.
First and foremost its Gm's decision, not necessarily the dealerships. Some dealers are "mod friendly" they decide not to share what was modified on the car when dealing with GM.
Secondly, your warranty isn't void because of modifications or being tuned. The part that failed needs to have failed due to the modification(s). My trans was tuned but Gm decided since the failure wasn't because of anything I had done to the car they replaced it at their expense.
Say for example, the power train warranty gets voided, that doesn't mean your whole warranty is void. If something with the infotainment system goes or the door release button doesn't work, dome light goes out etc.. it will still get fixed by GM.
Pretty much as long as whatever is done to the car aftermarket wise is not the direct reason for any part failure, GM would cover it.
That's how the warranty was explained to me by the dealership.
Hope this helps.
Eric
First and foremost its Gm's decision, not necessarily the dealerships. Some dealers are "mod friendly" they decide not to share what was modified on the car when dealing with GM.
Secondly, your warranty isn't void because of modifications or being tuned. The part that failed needs to have failed due to the modification(s). My trans was tuned but Gm decided since the failure wasn't because of anything I had done to the car they replaced it at their expense.
Say for example, the power train warranty gets voided, that doesn't mean your whole warranty is void. If something with the infotainment system goes or the door release button doesn't work, dome light goes out etc.. it will still get fixed by GM.
Pretty much as long as whatever is done to the car aftermarket wise is not the direct reason for any part failure, GM would cover it.
That's how the warranty was explained to me by the dealership.
Hope this helps.
Eric
Last edited by MikeLsx; Feb 2, 2016 at 03:41 AM.
Thread Starter
Instructor
Joined: Jul 2015
Posts: 210
Likes: 32
From: Raleigh
That's what I always heard, but my local dealer told me they wouldn't do the transmission re-flash, because my car was tuned. The TCM still had the factory tune, so it was never modified. It was also a well known issue for most a8's. Modifying my engine tune would have had no effect on a needed TCM update.