C7 General Discussion General C7 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

A8 Transmission failure tracking

 
Old 03-15-2019, 04:49 PM
  #1041  
joemessman
CF Senior Member
 
joemessman's Avatar
 
Member Since: Nov 2015
Location: Lake Havasu City Arizona
Posts: 4,380
Thanked 1,390 Times in 932 Posts
Default

Originally Posted by Burnsie View Post
I have a 2017 GS automatic with 3300 miles. The last time I drove it was to back it out the garage to wash it and pull it back into the garage when I was done. This morning when I put it into reverse, it would not move. It would not go forward either. I put it in neutral. Let it set. I probably repeated these steps three times all the while checking underneath the car to confirm that nothing was blocking the tires. I also checked the parking brake. I’m not a ‘car guy’ so I don’t know what’s happening but this has me freaked out.

Any advice would be much appreciated.
It could be the stator assembly in the torque converter. Have it towed to the dealer. It's probably not forcing the fluid onto the blades of the turbine. Actually I'm pretty sure that is the issue. I hope I am wrong and it is just something simple. Hopefully it is just the brakes sticking.

Last edited by joemessman; 03-15-2019 at 04:51 PM.
joemessman is offline  
Old 03-15-2019, 04:56 PM
  #1042  
guitarman1
Junior Member
 
Member Since: May 2018
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Before having it towed, I would try putting it into reverse and give it a little more gas getting out of your garage. It could be simply rust between the brake pads and the rotors. If that doesn't work, then it's something more serious.
guitarman1 is offline  
Old 03-15-2019, 07:19 PM
  #1043  
NSC5
CF Senior Member
Support Corvetteforum!
 
NSC5's Avatar
 
Member Since: Aug 2012
Posts: 3,895
Thanked 1,019 Times in 691 Posts
Default

Extremely high likelihood that the pads are stuck to the rotor. This can happen with any vehicle but the very large pads/swept area means with a Corvette the "lock" will be far more solid. Does the engine appear to be under load when you apply a little throttle in forward and reverse? Try rocking between forward and reverse a few times and they will probably break loose.

After washing or driving in the rain it is a very good idea to drag the brakes enough to generate some heat. This problem rarely occurs from driving in the rain because enough heat is naturally built up during driving to "drive" out the moisture that leads to rust but washing the car and pulling it into the garage is the perfect plan to create this pad to rotor lock.
NSC5 is offline  
Old 03-15-2019, 07:20 PM
  #1044  
Burnsie
Junior Member
 
Member Since: Feb 2019
Posts: 7
Thanks: 0
Thanked 1 Time in 1 Post
Default

So I was able to get it to drive. I drove it to work and drove it home. About twenty minutes each way. Itís vibrating/shuddering. Iím taking it to the dealership. Something is not right. Hoping I havenít made a mistake buying GM.

Last edited by Burnsie; 03-15-2019 at 07:28 PM.
Burnsie is offline  
Old 03-15-2019, 07:25 PM
  #1045  
Blue Curvette
Junior Member
 
Member Since: Jan 2019
Posts: 5
Thanks: 0
Thanked 2 Times in 1 Post
Default

Originally Posted by Burnsie View Post
So I was able to get it to drive. I drove it to work and drove it home. About twenty minutes each way. Itís vibrating/shuddering. Iím taking it to the dealership. Something is not right.
Sounds like the torque converter...
Blue Curvette is offline  
Old 03-15-2019, 08:55 PM
  #1046  
tzoid9
CF Senior Member
 
tzoid9's Avatar
 
Member Since: Jan 2016
Posts: 952
Thanked 164 Times in 132 Posts
Default

Originally Posted by NSC5 View Post
Extremely high likelihood that the pads are stuck to the rotor. This can happen with any vehicle but the very large pads/swept area means with a Corvette the "lock" will be far more solid. Does the engine appear to be under load when you apply a little throttle in forward and reverse? Try rocking between forward and reverse a few times and they will probably break loose.

After washing or driving in the rain it is a very good idea to drag the brakes enough to generate some heat. This problem rarely occurs from driving in the rain because enough heat is naturally built up during driving to "drive" out the moisture that leads to rust but washing the car and pulling it into the garage is the perfect plan to create this pad to rotor lock.
This is exactly correct! I had the same problem in my GT-R and it was really severe....very large brakes and a high iron content in the brake pads and discs/rotors. The problem was well known and even addressed in the owner's manual. Bad enough, in fact, that there were known occurrences of busting the brake rotors when really forcing the issue of trying to break loose the brakes! I have the iron brakes on my Z06 and it does they stick somewhat (nothing near as bad as the GT-R) and it does it even less on my '19 Mercedes. Nature of the beast....get a dustless type brake pad and this problem practically vanishes and better yet, so does the dust! I have the Z26 Powerstops, inexpensive (about $140 for all four wheels) and they work great....little to no sticking and dustless.
tzoid9 is offline  
The Following User Says Thank You to tzoid9 For This Useful Post:
NSC5 (03-16-2019)
Old 03-16-2019, 05:52 PM
  #1047  
rkhegler
CF Senior Member
 
rkhegler's Avatar
 
Member Since: Mar 2004
Location: Big Red Ne
Posts: 29,364
Thanked 324 Times in 132 Posts
Default

So, after reading all of these posts, did GM ever come up with an actual, real permanent fix?
rkhegler is offline  
Old 03-16-2019, 06:04 PM
  #1048  
Roastum1
CF Member
 
Roastum1's Avatar
 
Member Since: Sep 2018
Posts: 79
Thanks: 0
Thanked 11 Times in 9 Posts
Default

They have a new fluid with a proper fill of transmission. Is what i understand. Wasn't filled properly at factory?
Roastum1 is offline  
Old 03-17-2019, 08:42 AM
  #1049  
rkhegler
CF Senior Member
 
rkhegler's Avatar
 
Member Since: Mar 2004
Location: Big Red Ne
Posts: 29,364
Thanked 324 Times in 132 Posts
Default

Originally Posted by Roastum1 View Post
They have a new fluid with a proper fill of transmission. Is what i understand. Wasn't filled properly at factory?
i have a difficult time believing that a “fill” issue causes the problem. Changing the fluid viscosity is also suspect. If this is true, research development and testing are severely lacking before a product is available on the market. I hope it is that simple.

Last edited by rkhegler; 03-17-2019 at 08:42 AM.
rkhegler is offline  
Old 03-17-2019, 10:02 AM
  #1050  
NSC5
CF Senior Member
Support Corvetteforum!
 
NSC5's Avatar
 
Member Since: Aug 2012
Posts: 3,895
Thanked 1,019 Times in 691 Posts
Default

Originally Posted by rkhegler View Post
i have a difficult time believing that a ďfillĒ issue causes the problem. Changing the fluid viscosity is also suspect. If this is true, research development and testing are severely lacking before a product is available on the market. I hope it is that simple.
Viscosity was the change for the first revised fluid, they are now blaming the original two fluid versions for being hygroscopic which is the formula change for fluid number version number 3. I share you skepticism.

The only factory fill problems were with the rear differential level (under filled early production) and proper filling of the Z06 intercooler system where too much air was left in the tank causing the pump to shut down. Fill level wasn't an issue with the 8L90 and either under or over-filling would cause a host of symptoms (slippage, failure to engage, overheating, etc. but not shudder)..

My 2016 Z06 has been fine thus far running on its original fluid and the second gen torque converter (it has its original torque converter and the changeover occurred before it was built in March 2016). It is never allowed to go into V4 mode which helps to prevent GM's clutch destroying programming.
NSC5 is offline  
Old 03-17-2019, 11:13 AM
  #1051  
rkhegler
CF Senior Member
 
rkhegler's Avatar
 
Member Since: Mar 2004
Location: Big Red Ne
Posts: 29,364
Thanked 324 Times in 132 Posts
Default

Originally Posted by NSC5 View Post
Viscosity was the change for the first revised fluid, they are now blaming the original two fluid versions for being hygroscopic which is the formula change for fluid number version number 3. I share you skepticism.

The only factory fill problems were with the rear differential level (under filled early production) and proper filling of the Z06 intercooler system where too much air was left in the tank causing the pump to shut down. Fill level wasn't an issue with the 8L90 and either under or over-filling would cause a host of symptoms (slippage, failure to engage, overheating, etc. but not shudder)..

My 2016 Z06 has been fine thus far running on its original fluid and the second gen torque converter (it has its original torque converter and the changeover occurred before it was built in March 2016). It is never allowed to go into V4 mode which helps to prevent GM's clutch destroying programming.
Personally. I think it is a mechanical design problem. GM is avoiding the issue (with temporary fixes) because it will be too expensive to redesign and replace all the converters.
rkhegler is offline  
Old 03-17-2019, 11:26 AM
  #1052  
Barry Hanna
CF Senior Member
 
Barry Hanna's Avatar
 
Member Since: Jul 2004
Location: Atlanta Georgia
Posts: 114
Thanked 4 Times in 2 Posts
Default

It’s amazing the tolerance that loyal customers have for such a failure. I would have thought that A8 sales would have gone to zero by now. Evidently, GM is content to let the problem continue, most likely it’s too costly to fix. One day, internal memos will shine a bright light on this fail. In the meantime, my purchase of any next Corvette is a non-starter.
Barry Hanna is offline  
Old 03-17-2019, 11:49 AM
  #1053  
weathermaker
CF Senior Member
 
weathermaker's Avatar
 
Member Since: Jul 2006
Location: Marlborough Ma
Posts: 3,535
Thanked 21 Times in 19 Posts
Default

It sounds like the problem has been resolved. There seems like nobody is complaining with the 2019 units. I hope this is the case since I am looking at a 2019 and undecided on transmissions. Should I be worried with the A8?
weathermaker is offline  
Old 03-17-2019, 12:22 PM
  #1054  
Dave02C5
CF Senior Member
 
Dave02C5's Avatar
 
Member Since: Apr 2010
Location: MD
Posts: 597
Thanks: 0
Thanked 8 Times in 5 Posts
Default

dealer triple flushed mine with a new fluid. problem is gone in my base '15.
Dave02C5 is offline  
Old 03-17-2019, 12:50 PM
  #1055  
NSC5
CF Senior Member
Support Corvetteforum!
 
NSC5's Avatar
 
Member Since: Aug 2012
Posts: 3,895
Thanked 1,019 Times in 691 Posts
Default

If it stays gone, I will be happy and will get my fluid changed. But a lot of people had initial success with fluid version 2 only to have the problem return within a year so I think the jury is still out on this one.
NSC5 is offline  
Old 03-17-2019, 02:19 PM
  #1056  
rkhegler
CF Senior Member
 
rkhegler's Avatar
 
Member Since: Mar 2004
Location: Big Red Ne
Posts: 29,364
Thanked 324 Times in 132 Posts
Default

Originally Posted by Barry Hanna View Post
Itís amazing the tolerance that loyal customers have for such a failure. I would have thought that A8 sales would have gone to zero by now. Evidently, GM is content to let the problem continue, most likely itís too costly to fix. One day, internal memos will shine a bright light on this fail. In the meantime, my purchase of any next Corvette is a non-starter.
Agree!
rkhegler is offline  
Old 03-19-2019, 11:57 AM
  #1057  
BK Vette
Junior Member
 
Member Since: Feb 2019
Posts: 11
Thanks: 0
Thanked 1 Time in 1 Post
Default

do the 2019+ models already have this new fluid?

I am still debating between manual and auto but prefer an auto. I wish the C7 had the 10 speed from the ZL1 (which is also being considered).
BK Vette is offline  
Old 03-19-2019, 02:08 PM
  #1058  
BarneyZ
CF Senior Member
Support Corvetteforum!
 
BarneyZ's Avatar
 
Member Since: Sep 1999
Location: DFW, TX
Posts: 2,086
Thanked 23 Times in 20 Posts
Default

Now holding onto my 2015 M7 for dear life!
BarneyZ is offline  
Old 03-21-2019, 11:46 PM
  #1059  
EdMu
Junior Member
 
Member Since: Jun 2018
Posts: 14
Thanks: 0
Thanked 5 Times in 4 Posts
Default

Originally Posted by rkhegler View Post
Agree!
Indeed. After spending months on this forum I was led back to another Porsche Boxster S. I freely admit I was disappointed and wanted a C7 having owned a C2 and C3 previously. My hopes are that the C8 will be much closer to spot on right out of the chute.
EdMu is offline  
Old Yesterday, 08:50 AM
  #1060  
Ron_Attleboro_MA
CF Member
 
Ron_Attleboro_MA's Avatar
 
Member Since: Aug 2017
Posts: 55
Thanked 13 Times in 11 Posts
Default You can run, but you can't hide

Originally Posted by EdMu View Post
Indeed. After spending months on this forum I was led back to another Porsche Boxster S. I freely admit I was disappointed and wanted a C7 having owned a C2 and C3 previously. My hopes are that the C8 will be much closer to spot on right out of the chute.
Even the Boxster-S has problems, something with the oil pumps? My friend had one and a known problem I can't remember occurred.
Boxster's require pulling the engine for many problems. Very expensive for maintenance but they do have the 'Porchse' badge.
Good luck and enjoy the Boxster, they are fun to drive.
Ron_Attleboro_MA is offline  

Thread Tools
Search this Thread
Quick Reply: A8 Transmission failure tracking


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: