Transmission failure

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Mar 28, 2020 | 08:44 PM

rmorin1249

Thread Starter

Le Mans Master

Joined: Sep 2012

Posts: 7,146

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From: Hagerstown MD

St. Jude Donor '15-'16,'18

Transmission failure

Hopefully this is a one off: https://carbuzz.com/news/2020-c8-cor...after-32-miles

Mar 28, 2020 | 08:48 PM

24/Eray

Race Director

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From: NJ

Normal type of failure. Hiw many parts are in there? They always calculate a failure rate. With 3k built or so CTF and production? I'm thinking you would need to see maybe 30+ trans have to be swapped before they even blink

Mar 28, 2020 | 09:01 PM

JoelVetteguy

Instructor

Joined: Jul 2014

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From: Jacksonville Beach Fla

It was an oil leak. No mechanical failure. Most likely bad seal. Happens. Stinks but happens. No big deal.

Mar 28, 2020 | 09:41 PM

Steve Garrett

CORVETTE TODAY Show Host

Joined: Oct 2013

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From: Kansas City, Missouri

CORVETTE TODAY Host

St. Jude Donor'15

Agreed...gotta be a one-off situation.

Mar 28, 2020 | 09:58 PM

rramjet

Pro

Joined: Nov 2012

Posts: 552

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From: Everett/Mesa WA/AZ

The 8 speed in my 2015 quit at 79 miles. Wouldn’t go into any gear. Got the car back in 4 work days. GM had one overnighted to the dealer.

Mar 28, 2020 | 10:06 PM

d96eddie2

Advanced

Joined: Jan 2020

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Quote:

Originally Posted by JoelVetteguy

It was an oil leak. No mechanical failure. Most likely bad seal. Happens. Stinks but happens. No big deal.

Agree fully, "Transmission failure" this is not. Transmission filter fluid leaks are well known. Others perhaps. For now this "Transmission failure" is a non issue.

Michael

Mar 28, 2020 | 10:45 PM

starscream716

Instructor

Joined: Feb 2020

Posts: 142

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From: Buffalo, NY

It was just a leaky axle seal, that’s all. Covered in another thread on this board days ago.

Mar 29, 2020 | 02:22 PM

Larry/car

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Joined: May 2008

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From: Manheim Pennsylvania

After all the automatic transmission failures and having owned a 2016 Colorado I will never own a GM automatic again. No C8 for me.

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Mar 29, 2020 | 02:25 PM

rmorin1249

Thread Starter

Le Mans Master

Joined: Sep 2012

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From: Hagerstown MD

St. Jude Donor '15-'16,'18

I have similar feelings after the experience I had with my '16 Stingray. I'm waiting a couple years before considering a C8.

Mar 30, 2020 | 07:15 AM

#10

baf2000_1

Racer

Joined: Aug 2005

Posts: 449

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Though this looks like it is not a mechanical failure of the trans, it could very well be a faulty seal.
If so could be a failure that needs to be fixed on many cars.
The first year of a new DCT could be a tough one. Performance drivers beware

Mar 30, 2020 | 09:10 AM

#11

Tonylmiller

Race Director

Joined: Apr 2006

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From: Huntsville AL

Should have gone with the manual transmission and this would not have happened!!!!!!!!!!!!!!!111

I have heard that this thing has TWO CLUTCHES!!!!!1 A person only has two feet, how are we supposed to drive that?!?!?!?!?!?!?!?!

Mar 30, 2020 | 09:23 AM

#12

CamsC8

Burning Brakes

Joined: Aug 2019

Posts: 1,189

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From: Toronto, Canada

Guys...do you realize how many PDK failures occured and still occur in Porsche circles. Chill.

And that's the benchmark dual clutch on the market.

Mar 30, 2020 | 09:38 AM

#13

C8Jake

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From: ►SICAMOUS◄

Quote:

Originally Posted by CamsC8

Guys...do you realize how many PDK failures occured and still occur in Porsche circles.

that's relevant

Mar 30, 2020 | 09:42 AM

#14

CamsC8

Burning Brakes

Joined: Aug 2019

Posts: 1,189

Likes: 1,002

From: Toronto, Canada

Quote:

Originally Posted by C8Jake

that's relevant

It is relevant. Do you honestly think manufacturers come out with perfect transmissions each and every time? Porsche are way more detail and engineering orientated and they still have their issues.

Yes this is relevant. Hell Porsche even had engine failures in the 14/15 GT3s and God forbid GM has a tranny leak... imagine engine failures on the C8..."ahhh sky is falling".

Mar 30, 2020 | 09:46 AM

#15

24/Eray

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From: NJ

Quote:

Originally Posted by baf2000_1

theres pros and cons to being first to have a product. I applaud those willing (I am no longer one) because without those brave enough? We wouldn't have new models lol.

Mar 30, 2020 | 09:46 AM

#16

C8Jake

Race Director

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From: ►SICAMOUS◄

Quote:

Originally Posted by CamsC8

Porsche are way more detail and engineering orientated.

of course

Last edited by C8Jake; Mar 30, 2020 at 09:52 AM.

Mar 30, 2020 | 01:11 PM

#17

7thgeneration

Burning Brakes

Joined: Jan 2000

Posts: 1,226

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From: Ohio

Of course transmission failure sounds much more dramatic than a simple fluid leak. Oh my God what will we all do, what will we all do ?

Mar 30, 2020 | 01:25 PM

#18

edgenet1

Advanced

Joined: Jul 2019

Posts: 73

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From: Toronto, Canada

Too bad GM did not choose to go with a bullet-proof ZF tranny. Nowadays the Trannies are far more complex than any engine especially the GM push-rod engines created in the 30's

Mar 30, 2020 | 01:28 PM

#19

edgenet1

Advanced

Joined: Jul 2019

Posts: 73

Likes: 13

From: Toronto, Canada

Quote:

Originally Posted by baf2000_1

Are you kidding a seal bet all made in China

Mar 30, 2020 | 02:13 PM

#20

rangda

Racer

Joined: Dec 2016

Posts: 263

Likes: 124

From: Tewksbury MA

Quote:

Originally Posted by Tonylmiller

I have heard that this thing has TWO CLUTCHES!!!!!1 A person only has two feet, how are we supposed to drive that?!?!?!?!?!?!?!?!

That is why it is called a dual clutch transmission. A dual clutch transmission is sort of like combining two manual gearboxes, one that handles all the odd gears and one that handles all the even gears. Each virtual gearbox has its own clutch. That is how the shifts are so fast, you are always shifting sequentially so when you go up or down a gear you are really hopping between transmissions, with the help of electronics. Which is also why the qualify of the programming of said electronics can make or break the responsiveness and performance of a dual clutch. When shifting gears software handles clutch in/out for you which is why there is no clutch pedal even though the transmission is effectively working like a manual (you could never work the pedal fast enough anyway). My explanation is overly simplified, here is a more detailed look at what goes on:

https://auto.howstuffworks.com/dual-...ansmission.htm

This tech is not new, it's been in racing and other performance cars for decades. The specific gearbox in the C8, however, is new, and some teething problems should be expected.

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