C8 problems
Pro
Joined: May 2005
Posts: 534
Likes: 158
From: Treasure Coast FL
Dude, I got a first-year C7 also. It was not bug-free, but I didn't care. I wanted that car, bugs and all. The entire touchscreen unit had to be replaced, along with a few other things. This was a widespread problem, which is fact. If you personally had no issues, all props to you, but to make some kind of insinuation that first-year cars do not have bugs is insane. They do.
Instructor
Joined: Jul 2014
Posts: 209
Likes: 51
From: Phoenix, Arizona
My 2014 also had the touchscreen replaced. No big deal though - just make sure you get everything out of the cubby. By the way, does the touchscreen drop on the C8? It doesn’t look like it.
I think the electronics will be the weak link of this car. Seeing strange CAN bus errors is one example.
Still, I wish I had mine.
I think the electronics will be the weak link of this car. Seeing strange CAN bus errors is one example.
Still, I wish I had mine.
Last edited by vanlieremead; Jun 13, 2020 at 04:08 PM.
Le Mans Master
Joined: Apr 2020
Posts: 6,378
Likes: 3,290
Various Electronics Thas been 90% of the problems encountered during my warranty period on my other GM vehicle. That's probably true of most vehicles manufactured in the last 5-10 years. We're buying engines and bodies wrapped around by many computers.
Burning Brakes
Joined: Feb 2005
Posts: 867
Likes: 148
From: N CA
There have been AC issues with some new 2020 BMW M8's of late, compressor is the culprit, don't know if sourced from the same supplier as the C8, and they are also on backorder.
Burning Brakes
Joined: Aug 2019
Posts: 1,189
Likes: 1,002
From: Toronto, Canada
Oh joy...well hopefully it will turn out to be an easy fix. I'll update the thread this upcoming week.
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Burning Brakes
Joined: Mar 2012
Posts: 1,091
Likes: 702
Drifting
Joined: Feb 2017
Posts: 1,778
Likes: 902
So much for the GM will fix it this time aroundo, not good enough.
Burning Brakes
Joined: Mar 2012
Posts: 1,091
Likes: 702
There is apparently a bulletin out for GM to fix affected cars, and the plant is fixing at the assembly level. Unfortunately mine is covered in PPF, which wouldn't be covered during the repair, so I'm not about to have it ripped off to repaint the bumper and pay to have new film applied at my cost. Sucks, but I guess I'll touch it up and move on.
Burning Brakes
Joined: Jul 2008
Posts: 1,236
Likes: 270
From: Rattlesnake, FL
Link to my thread. Oil leak at 225 miles.
https://www.corvetteforum.com/forums...luid-leak.html
https://www.corvetteforum.com/forums...luid-leak.html
4th Gear
Joined: Jun 2020
Posts: 4
Likes: 29
From: Auckland, New Zealand
C8 Transmission Problems
Hi there, I am an engineer at Dodson Motorsport.
We noticed a few people are posting about a transmission problem where the gearbox only uses even gears and goes into a limp mode.
Fault codes from the TCM are:
P0700
P2838
P2839
We thought we might be able to shed some light on this issue.
The fault codes translate to issues with the shift fork for 5/7th gears.
In a transmission that we have disassembled, we found that there was a flaw on assembly which resolved in a damaged seal for that shift fork.
This seal will cause the shift fork to become stuck or "lazy" in 7th gear and no return to its neutral position or engage 5th. This would explain when driving at 50-55mph the issue arises.
We hope this clarifies what the potential problem could be.
- Taylor
We noticed a few people are posting about a transmission problem where the gearbox only uses even gears and goes into a limp mode.
Fault codes from the TCM are:
P0700
P2838
P2839
Today just before reaching my first 400 miles the transmission started only changing from gears 2-4-6-8.... turned off and on and same issue... later on the way back home (good thing I was close to home) it wouldn’t change from gear 2 for a while than it started again back to head 2-4-6-8... its like the car doesn’t recognize gears 1-3-5-7. I guess it’s the price to pay for been in the first batch of production.... I’ll be contacting my dealer tomorrow.....
Could help my self and restarted the car and back to normal.... I didn’t try putting it in reverse the first time... but in any case just drove the car for some 20 miles and just like if nothing ever happened😁!!!! Happy for that but concerned about when will this issue shows again 😟...
If anyone has experienced something similar, please reply and let me know...
Besides this issue the car has been just pure joy... perfect in every way....
I will keep updates as GM is contacted and I get information about this issue!!!
i got my car in service today... they believe it has to do with the car learning the driver patterns and so on. They uploaded a refresh update in my odd gears into the system and most importantly I got my car back the same day!!!! I will inform periodically on this situation.. my hope is that all is good and taken care now!!!! C8 rocks and yes I will be in line to buy it again.. it’s beyond imagination...🏎❤️It!!! 😀
Hi folks, my Corvette was serviced yesterday 3/24/2020. The technician was able to recover 3 codes (P0700, P2838, P2839) if anyone can help me understand what they mean that will be awesome...
with intense help from GM tech support, the transmission programming for odd gears was reset and reloaded. GM believes it is possible that is related to the learning mode and so on...
I got my Corvette back at the end of the day... 😄...
Take care for now!
Could help my self and restarted the car and back to normal.... I didn’t try putting it in reverse the first time... but in any case just drove the car for some 20 miles and just like if nothing ever happened😁!!!! Happy for that but concerned about when will this issue shows again 😟...
If anyone has experienced something similar, please reply and let me know...
Besides this issue the car has been just pure joy... perfect in every way....
I will keep updates as GM is contacted and I get information about this issue!!!
i got my car in service today... they believe it has to do with the car learning the driver patterns and so on. They uploaded a refresh update in my odd gears into the system and most importantly I got my car back the same day!!!! I will inform periodically on this situation.. my hope is that all is good and taken care now!!!! C8 rocks and yes I will be in line to buy it again.. it’s beyond imagination...🏎❤️It!!! 😀
Hi folks, my Corvette was serviced yesterday 3/24/2020. The technician was able to recover 3 codes (P0700, P2838, P2839) if anyone can help me understand what they mean that will be awesome...
with intense help from GM tech support, the transmission programming for odd gears was reset and reloaded. GM believes it is possible that is related to the learning mode and so on...
I got my Corvette back at the end of the day... 😄...
Take care for now!
Hello Folks,
To keep it short, not good news..... My car is now in the service department for a full transmission replacement. My odd/even gear issue reappeared and GM immediately decided to swap the transmission and to send back my transmission for forensic work. Apparently they have identified a failure with something inside the transmission preventing the odd gears to engage and only keep changing bt even gears. For additional details on my issue you can see my earlier posts. While I am not happy about having to go thru this, I commend GM for the decision to replace the transmission and to send it back to fully understand this issue to prevent a potential painful recall situation in the future. I wish GM technical support contact me directly for a dialog on my situation and for ways they can compensate me for this very unfortunate situation.
I will keep posting as get more updates. omeprazole Magnesium
C8PRO
To keep it short, not good news..... My car is now in the service department for a full transmission replacement. My odd/even gear issue reappeared and GM immediately decided to swap the transmission and to send back my transmission for forensic work. Apparently they have identified a failure with something inside the transmission preventing the odd gears to engage and only keep changing bt even gears. For additional details on my issue you can see my earlier posts. While I am not happy about having to go thru this, I commend GM for the decision to replace the transmission and to send it back to fully understand this issue to prevent a potential painful recall situation in the future. I wish GM technical support contact me directly for a dialog on my situation and for ways they can compensate me for this very unfortunate situation.
I will keep posting as get more updates. omeprazole Magnesium
C8PRO
We thought we might be able to shed some light on this issue.
The fault codes translate to issues with the shift fork for 5/7th gears.
In a transmission that we have disassembled, we found that there was a flaw on assembly which resolved in a damaged seal for that shift fork.
This seal will cause the shift fork to become stuck or "lazy" in 7th gear and no return to its neutral position or engage 5th. This would explain when driving at 50-55mph the issue arises.
We hope this clarifies what the potential problem could be.
- Taylor
Advanced
Joined: Jan 2020
Posts: 81
Likes: 27
Hi there, I am an engineer at Dodson Motorsport.
We noticed a few people are posting about a transmission problem where the gearbox only uses even gears and goes into a limp mode.
Fault codes from the TCM are:
P0700
P2838
P2839
We thought we might be able to shed some light on this issue.
The fault codes translate to issues with the shift fork for 5/7th gears.
In a transmission that we have disassembled, we found that there was a flaw on assembly which resolved in a damaged seal for that shift fork.
This seal will cause the shift fork to become stuck or "lazy" in 7th gear and no return to its neutral position or engage 5th. This would explain when driving at 50-55mph the issue arises.
We hope this clarifies what the potential problem could be.
- Taylor
We noticed a few people are posting about a transmission problem where the gearbox only uses even gears and goes into a limp mode.
Fault codes from the TCM are:
P0700
P2838
P2839
We thought we might be able to shed some light on this issue.
The fault codes translate to issues with the shift fork for 5/7th gears.
In a transmission that we have disassembled, we found that there was a flaw on assembly which resolved in a damaged seal for that shift fork.
This seal will cause the shift fork to become stuck or "lazy" in 7th gear and no return to its neutral position or engage 5th. This would explain when driving at 50-55mph the issue arises.
We hope this clarifies what the potential problem could be.
- Taylor
Intermediate
Joined: Jul 2018
Posts: 27
Likes: 6
From: Lake Charles, Louisiana
Flooded carpet
My AC drain line got kinked and misaligned somehow and flooded my passenger floorboard carpet. Dealer realigned the line, siliconed it in place so it wouldn’t pop back out and then disinfected and cleaned all the carpets.
Team Owner
Joined: Feb 2013
Posts: 22,598
Likes: 14,555
You're the 2nd or 3rd to report that. Hopefully the dealer is feeding this stuff back to BGA to make ongoing improvements.
Instructor
Joined: Sep 2012
Posts: 143
Likes: 53
Engine overheat, coolant loss
1700 miles in, my C8 lost all coolant and engine overheated. I was in a driving rain and had no idea that coolant was lost. Interesting that the car has no low coolant warning.
Also, when it comes to towing, be aware that it is basically impossible to put the car in neutral without starting the engine. Not exactly what you want to do with an engine issue.
Issue was a hose clamp improperly installed at the factory.
Also, when it comes to towing, be aware that it is basically impossible to put the car in neutral without starting the engine. Not exactly what you want to do with an engine issue.
Issue was a hose clamp improperly installed at the factory.
Last edited by srosenbldr; Jun 26, 2020 at 11:12 PM. Reason: Correction