View Poll Results: How many C8 owners have DCT issues / problems?
Yes, I have a DCT problem / issue that is not resolved
10
7.19%
Yes, I HAD a DCT problem that is now fixed
10
7.19%
No, I have not experienced a DCT problem on my C8
119
85.61%
Voters: 139. You may not vote on this poll
DCT Transmission Problem Survey
Thread Starter
Pro
Joined: Dec 1999
Posts: 545
Likes: 286
From: Lords Valley PA
DCT Transmission Problem Survey
OK.... Lots of questions / issues have been posted in regard to C8 DCT issues / problem. So how many as a percentage of delivered C8s here / are experiencing a "problem". Let's do a survey!
Yes, I have a DCT problem that is unresolved
Yes, I HAD a DCT problem that is now fixed
No, I have never had a DCT problem on my C8
Al Engel "Save the Wave"
Yes, I have a DCT problem that is unresolved
Yes, I HAD a DCT problem that is now fixed
No, I have never had a DCT problem on my C8
Al Engel "Save the Wave"
Last edited by Al Engel; Jul 25, 2021 at 03:16 PM. Reason: Spelling
Melting Slicks
Joined: Oct 2020
Posts: 2,194
Likes: 1,898
From: Not too far from MacMulkin
2026 Corvette of the Year Finalist - Unmodified
2025 C8 Z06/7/E-Ray of the Year Winner - Unmodified
2021 C8 of the Year Finalist - Unmodified
I've had no problems of any kind, including with the DCT, after about 1300 miles in the first month of ownership (despite LOTS of rain)!
CF Community Team
Joined: Oct 2004
Posts: 19,366
Likes: 5,244
From: Cape Cod, Mass.
2025 C6 of the Year Finalist - Unmodified
2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2021 C8 of the Year Finalist Unmodified
2020 Corvette of the Year Finalist (performance mods)
2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
2016 C2 of Year
2015 C3 of Year Finalist
7,500 miles with zero issues on my 2020. I don't miss the manual in my C7 Z06, as much as I liked it. This DCT is fast and fun. Obviously, some have had issues but the vast majority have not.
22 Hypersonic Grey HTC
Joined: Mar 2014
Posts: 506
Likes: 144
From: Austin Texas
My vote was:
YES I had a DCT problem that is now fixed
@ 4,200 miles, the Main Valve Body was replaced on my 2021 (mid-January build)
I drove the car to the dealer for the warranty work and it was there one week
Now @ 6,800 miles with no other issues.
I will still change the DCT filter @ 7,500 miles to keep up with the owner's manual current maintenance schedule on the DCT filter replacement.
YES I had a DCT problem that is now fixed
@ 4,200 miles, the Main Valve Body was replaced on my 2021 (mid-January build)
I drove the car to the dealer for the warranty work and it was there one week
Now @ 6,800 miles with no other issues.
I will still change the DCT filter @ 7,500 miles to keep up with the owner's manual current maintenance schedule on the DCT filter replacement.
Drifting
Joined: Apr 2006
Posts: 1,449
Likes: 770
I had an unusual problem which existed from the time I took delivery. When I came to a complete stop, the car would jerk once, and sometimes twice. The shop foreman at my dealer took a ride with me, admitted he had never seen a car do this, contacted GM and was told to do what is called a transmission clean. I have no idea as to what that is. The next day I dropped the car off in the morning and picked it up that afternoon. This was 5000 miles ago and the tranny is perfect.
Race Director
Joined: Mar 2001
Posts: 19,965
Likes: 6,770
From: Bonneville Salt Flats
This survey shows a typical pattern, but still slanted toward problems in public forums. People "need" to express their issues and problems, but few have a need to constantly say or repeat that all is well.
However, that doesn't make the problems extant any less serious or their resolve any less important. I once overheard a major auto corporate attorney speaking to a local attorney in a Southern airport lounge about a wrongful death case in which the corporate lackey actually said--yes, I heard it, he wasn't quiet about it--that it was far cheaper to make a rare court decreed payment than fix untold vehicles. Pitiful, but true. I hope everyone the best with their C8s (and, others, of course, as well).
However, that doesn't make the problems extant any less serious or their resolve any less important. I once overheard a major auto corporate attorney speaking to a local attorney in a Southern airport lounge about a wrongful death case in which the corporate lackey actually said--yes, I heard it, he wasn't quiet about it--that it was far cheaper to make a rare court decreed payment than fix untold vehicles. Pitiful, but true. I hope everyone the best with their C8s (and, others, of course, as well).
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Racer
Joined: Oct 2012
Posts: 262
Likes: 182
All of you who have friends with a C8 in real life who aren't on the forums, please get them to make an account and reply. I am super curious to see the results from a representative sample.
My instinct tells me that this is NOT the usual case of people who have problems with their car being louder than those who don't (which is a real thing). It appears more likely that there are some issues to be worked out with this transmission.
But the only way to really know is to get a large enough dataset.
My instinct tells me that this is NOT the usual case of people who have problems with their car being louder than those who don't (which is a real thing). It appears more likely that there are some issues to be worked out with this transmission.
But the only way to really know is to get a large enough dataset.
Last edited by sambo60; Jul 25, 2021 at 08:30 PM.
Race Director
Joined: Nov 2003
Posts: 16,067
Likes: 4,150
From: Bergen county NJ
Last week my c8 which is 10 months and 8k miles on it wouldnt start as the dashboard said it wasnt in park but it was.
i disconnected the battery and the car realized it was in park and started. That was last saturday morning. This saturday night same thing happened.
unfortunately i disconnected the battery to start the car and onstar no has no codes after disconnecting the battery...
could be a miscommunication error as the car drives fine. Ill bring it to the dealer in a few days and hopefully a few codes will show up otherwise how will the GM tech know where to begin.
i disconnected the battery and the car realized it was in park and started. That was last saturday morning. This saturday night same thing happened.
unfortunately i disconnected the battery to start the car and onstar no has no codes after disconnecting the battery...
could be a miscommunication error as the car drives fine. Ill bring it to the dealer in a few days and hopefully a few codes will show up otherwise how will the GM tech know where to begin.
Last edited by JerriVette; Jul 25, 2021 at 09:58 PM.
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
Last week my c8 which is 10 months and 8k miles on it wouldnt start as the dashboard said it wasnt in park but it was.
i disconnected the battery and the car realized it was in park and started. That was last saturday morning. This saturday night same thing happened.
unfortunately i disconnected the battery to start the car and onstar no has no codes after disconnecting the battery...
could be a miscommunication error as the car drives fine. Ill bring it to the dealer in a few days and hopefully a few codes will show up otherwise how will the GM tech know where to begin.
i disconnected the battery and the car realized it was in park and started. That was last saturday morning. This saturday night same thing happened.
unfortunately i disconnected the battery to start the car and onstar no has no codes after disconnecting the battery...
could be a miscommunication error as the car drives fine. Ill bring it to the dealer in a few days and hopefully a few codes will show up otherwise how will the GM tech know where to begin.
I am pretty sure the DTC's from the TCM are stored in NVRAM, mine are as they are "permanent" and will survive a battery disconnect.
Pro
Joined: Mar 2021
Posts: 521
Likes: 1,188
From: Owasso, OK
I haven't received my C8 yet, pick it up on Friday. Hopefully I will be one of the lucky ones. The dealership I bought my C8 from had two C8's in their service bay with failed transmissions the day I paid for mine.
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
No 0-60 speed runs. No cruise control. No lugging the engine. (I think I would avoid fully manual shifting until out of the break-in period personally). No exceeding 4000rpm. No fixed RPM running. I put mine in sport / manual when driving longer roads to prevent it from running in 8th gear all the time and sitting at a relatively fixed RPM, then I used paddle shifters to down shift often to vary the revs. After a while it would go back to auto-drive and make it's way back into 8th gear.
I am at 1700mi and still haven't done any sort of launch control or PTM stuff. I have had a couple "spirited" runs up to 75mph though.
