C8 problems
Instructor
Joined: Jan 2011
Posts: 164
Likes: 98
From: Matthews NC
Well crafted post, highly agree with you! Although still a C6 GS owner (three pedal car) I did attend C8 owners school mid Nov. Totally awesome vehicle to say the least, can’t wait to take delivery.
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
You are correct that we need to get back on track with this thread. This thread is about C8 problems and how we can help each other out when someone has an issue. I have tried to do that numerous times whether than be DCT issues or issues with the computer cache, and have been thanked numerous times for doing so. I'm not so sure what you have done to help C8 owners with their issues.
I don't know what you think we should complain to GM about. GM already listens and makes changes when they see issues warranting changes. They already redesigned the transmission pan and gasket due to leaks. It has been reported that they also made some changes to the casting process due to the porosity issues. They asked their dealers to send all DCT filters back to GM for testing so they could see what type of particulates were circulating within the DCT resulting in plugging issues in the valve bodies. They have made changes to the front lift hydraulic reservoir cap due to leakage. They made changes to the A/C evaporator drain system/tunnel design due to water intrusion into the floor of the car. I could go on but I think I have made my point.
The overwhelming majority of C8 owners love their cars as is supported by JD Power and even the 2023 recommendations by Consumer Reports. On a forum such as this you are going to hear more often from those with problems vs. those without.
So let's get back on track and use this thread to report problems and allow respondents to help those with issues. But note that just because people post here with issues does not mean that it is a car to stay away from. It's a remarkable car.
I don't know what you think we should complain to GM about. GM already listens and makes changes when they see issues warranting changes. They already redesigned the transmission pan and gasket due to leaks. It has been reported that they also made some changes to the casting process due to the porosity issues. They asked their dealers to send all DCT filters back to GM for testing so they could see what type of particulates were circulating within the DCT resulting in plugging issues in the valve bodies. They have made changes to the front lift hydraulic reservoir cap due to leakage. They made changes to the A/C evaporator drain system/tunnel design due to water intrusion into the floor of the car. I could go on but I think I have made my point.
The overwhelming majority of C8 owners love their cars as is supported by JD Power and even the 2023 recommendations by Consumer Reports. On a forum such as this you are going to hear more often from those with problems vs. those without.
So let's get back on track and use this thread to report problems and allow respondents to help those with issues. But note that just because people post here with issues does not mean that it is a car to stay away from. It's a remarkable car.
I'll keep monitoring this forum in the hope that GM improves its quality to my high standards.
Good luck with your C8.
Instructor
Joined: Apr 2005
Posts: 122
Likes: 48
From: Lebanon PA
I just posted this on another section of the C8 forums......I recently picked up my C8. Unfortunately, the weather in the northeast hasn't been favorable to drive the car too often. (I have a whopping 30 miles on the car! LOL!) The last two times I started the car, the dash display shuttered (like a flickering TV), and within a few seconds settled to a stable view. The garage is not heated, and it has been very cold in PA. Do I need to be concerned or is this something I should expect since it is very cold? (I should have recorded a visual with my phone). Any thoughts would be appreciated.
Instructor
Joined: Apr 2005
Posts: 122
Likes: 48
From: Lebanon PA
Thanks for the recommendation. I bought the tender last week and hooked it up yesterday. Hopefully this takes care of the problem! Silly question.......the car only has 30 miles. Could the voltage still have been the issue?
Safety Car
Joined: Dec 1999
Posts: 4,714
Likes: 1,457
From: Virginia Beach, VA & Port Charlotte, FL
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
Yes, you clearly pointed out that GM uses buyers as testers. I can guarantee you that this is not the way things should be. It indicates that in-house testing was not thorough enough. I should not have to have multiple transmissions replaced before the manufacturer gets it right.
I'll keep monitoring this forum in the hope that GM improves its quality to my high standards.
Good luck with your C8.
I'll keep monitoring this forum in the hope that GM improves its quality to my high standards.
Good luck with your C8.
Race Director
Joined: Aug 2016
Posts: 12,749
Likes: 10,184
From: Garden Valley CA
Not necessarily. There are things called "Continuous Improvement Processes". It is very difficult to perform finite element analysis with every possible variable. Time to market is also a significant driving factor. Would you prefer to tack on another 5 years and double the unit price to get it 99% free of all issues?
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Joined: Apr 2017
Posts: 461
Likes: 327
From: PDX
Race Director
Joined: Aug 2016
Posts: 12,749
Likes: 10,184
From: Garden Valley CA
Le Mans Master
Joined: Sep 2017
Posts: 5,767
Likes: 2,967
From: Rural NW Georgia. GO DAWGS!
2024 C8 of the Year Finalist - Unmodified
Burning Brakes
Joined: Mar 2008
Posts: 1,046
Likes: 324
From: Lynnwood Washington
Dropping my 3 week old 23 off at the dealer tonight. Check engine light came on at 40 miles for emissions code P2254. Issue with an O2 sensor it appears. Hopefully an easy fix.
Safety Car
Joined: Dec 1999
Posts: 4,714
Likes: 1,457
From: Virginia Beach, VA & Port Charlotte, FL
It's interesting you bring up continuous improvement. Many times there are cost reduction clauses in the supplier contracts where the cost is expected to be reduced by a certain percentage each year due to learning and other things. However, the low hanging fruit isn't always there. Sometimes the changes have unintended consequences. So sometimes the first products off the line are the best.
No scientific study but in general the 2020's seem to have less problems that the 2023s. I would suspect that the latent effects of COVID are still haunting us, the "rubber band" effect. GM's vendors and sub-contractors with EXTREME pressure to manufacture and produce from the mother-ship were scrambling to get employees due to a large portion of their workforce being out with the virus. Those hired temp employees were unskilled and unknowing. Quality and reliability of the products suffered greatly. The vast majority of the problems were/are due to component/software failures.FWIW, I was searching for a slightly used GMC Yukon Denali in summer of last year. Being a member of the Yukon forum I was strongly advised to get a 2019/2020 as the 21s, 22s and more than likely the 23s were racked with problems, killing reliability. I bought a low mile 2019 and it's been flawless.
Instructor
Joined: Feb 2009
Posts: 217
Likes: 92
From: BRIGHTWATERS NY
You should be able to inspect the o2 sensor connection plug from the engine compartment...make sure its securely in place ?...if its loose... snug it down and drive it before dropping off at dealer...I had a similar problem and I was able to by pass the dealer and fix myself
Burning Brakes
Joined: Mar 2008
Posts: 1,046
Likes: 324
From: Lynnwood Washington
You should be able to inspect the o2 sensor connection plug from the engine compartment...make sure its securely in place ?...if its loose... snug it down and drive it before dropping off at dealer...I had a similar problem and I was able to by pass the dealer and fix myself
Instructor
Joined: Feb 2009
Posts: 217
Likes: 92
From: BRIGHTWATERS NY
Burning Brakes
Joined: Mar 2008
Posts: 1,046
Likes: 324
From: Lynnwood Washington
Dealer called and confirmed that it indeed does have a faulty 02 sensor. They are expediting a new one from back east and should have it back to me in a couple days. Hopefully this is the only bug in the car and I can continue putting my breakin miles on it.
Le Mans Master
Joined: Aug 2004
Posts: 6,412
Likes: 1,295
From: Bluffton, SC
No scientific study but in general the 2020's seem to have less problems that the 2023s. I would suspect that the latent effects of COVID are still haunting us, the "rubber band" effect. GM's vendors and sub-contractors with EXTREME pressure to manufacture and produce from the mother-ship were scrambling to get employees due to a large portion of their workforce being out with the virus. Those hired temp employees were unskilled and unknowing. Quality and reliability of the products suffered greatly. The vast majority of the problems were/are due to component/software failures.FWIW, I was searching for a slightly used GMC Yukon Denali in summer of last year. Being a member of the Yukon forum I was strongly advised to get a 2019/2020 as the 21s, 22s and more than likely the 23s were racked with problems, killing reliability. I bought a low mile 2019 and it's been flawless.