C8 problems
Melting Slicks
Joined: May 2009
Posts: 2,229
Likes: 393
From: Bmore Maryland
Intermediate
Joined: Mar 2022
Posts: 29
Likes: 9
My car came with a few electrical oddities that seem to have gone away. I have not done an update unless they can install manually.
- I've had an issue where my gauge cluster will show a random car message like "hood open" or whatever and then it just freezes and I don't have gauges until I park the car for a while.
- My brightness adjustments also refuse to work quite often and/or they are very slow to react.
- My alarm has gone off a couple times with my car just sitting in the garage untouched
Melting Slicks
Joined: May 2009
Posts: 2,229
Likes: 393
From: Bmore Maryland
In a separate thread I discussed my problem of the tonneau cover being stuck in the open position. I rattled the top and it drifted closed. Now it is working as it should. I will still take it to the dealership on Tuesday and report back on any findings. I doubt they will find anything.
Drifting
Joined: Jun 2007
Posts: 1,565
Likes: 293
From: Overland Park KS
Drifting
Joined: Jun 2007
Posts: 1,565
Likes: 293
From: Overland Park KS
Just met a gentleman with a 2022 C8 that had to have his transmission replaced due to the porosity problem. His car had a 13,XXX VIN and was built in Feb. I can't believe after 2 years of transmission issues this is still happening. Come on GM, get your act together!
Cruising
Joined: Sep 2020
Posts: 14
Likes: 2
My 2020 will be getting a new transmission. Waited 4 + weeks to get it approved. Hopefully I will get my car back soon.
Burning Brakes
Joined: Oct 2018
Posts: 985
Likes: 761
From: Monticello, AR
2024 C8 of the Year Finalist - Unmodified
I've had my 22' 5 months and 2500 miles. No issues until today, now I have a check engine and traction control light on. It says reduced acceleration, service traction control and service ESC. Car is drivable in all gears, but only in Z mode, My mode and Touring...the rest of the modes are unavailable. The cruise control and V4 is not available either. I drove it about 100 miles today with multiple restarts with no change. I have no idea what's going on and it looks like I'll have to unfortunately take it to the dealer.
Anyone who has had this issue or has any suggestions would be welcomed!
Anyone who has had this issue or has any suggestions would be welcomed!
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Instructor
Joined: Aug 2022
Posts: 149
Likes: 144
From: Gilbert, AZ
Quick question for all that are having issues with their C8's that require multiple weeks in the shop. Do they provide you a loaner/courtesy car? I cannot imagine some folks being able to go for weeks+ with no car. Wonder if there are mixed results too based on dealer. Also not expecting another C8 as a loaner, assume would be a Malibu/Equinox/Colorado or the like equivalent. Our GMC dealer provides the Terrain/Enclave but they will not work on Corvette's when I asked one of the service tech's.
Instructor
Joined: Oct 2021
Posts: 220
Likes: 140
Quick question for all that are having issues with their C8's that require multiple weeks in the shop. Do they provide you a loaner/courtesy car? I cannot imagine some folks being able to go for weeks+ with no car. Wonder if there are mixed results too based on dealer. Also not expecting another C8 as a loaner, assume would be a Malibu/Equinox/Colorado or the like equivalent. Our GMC dealer provides the Terrain/Enclave but they will not work on Corvette's when I asked one of the service tech's.
Race Director
Joined: Aug 2016
Posts: 12,710
Likes: 10,138
From: Garden Valley CA
Quick question for all that are having issues with their C8's that require multiple weeks in the shop. Do they provide you a loaner/courtesy car? I cannot imagine some folks being able to go for weeks+ with no car. Wonder if there are mixed results too based on dealer. Also not expecting another C8 as a loaner, assume would be a Malibu/Equinox/Colorado or the like equivalent. Our GMC dealer provides the Terrain/Enclave but they will not work on Corvette's when I asked one of the service tech's.
Drifting
Joined: Jan 2014
Posts: 1,614
Likes: 1,112
From: Cincinnati OH
It seems hard to believe that the Corvette is a person's only car. Unusual to say thr least.
Burning Brakes
Joined: Sep 2019
Posts: 1,215
Likes: 1,178
Modified C8 of the Year 2021 Winner
We own two Subarus, and have always gotten courtesy or rental cars for warranty or recall work, but not for service outside of those two things. For my C8 first service, the dealership provided me with a rental car as they kept it overnight.
Intermediate
Joined: Sep 2019
Posts: 42
Likes: 8
From: PA/NY border
Flicker in just part of gear indication number
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Instructor
Joined: Jan 2009
Posts: 119
Likes: 136
From: Cicero, IN
Flicker in just part of gear indication number
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
-Bryce
Intermediate
Joined: Sep 2019
Posts: 42
Likes: 8
From: PA/NY border
Quote:
Originally Posted by realityintrudes View Post
Flicker in just part of gear indication number
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Quote:
Originally Posted by bleppek
I also noticed this one time on my 22 HTC a few months ago on a drive. It only happened the one time and was gone the very next time I started the car. Hasn't happened again since (and I do watch for it now).
-Bryce
Driving the half-hour each way yesterday I found it inconsistent and relatively unpredictable as to when (ie, how long after I started driving, achieving and staying in a particular gear, if I changed drive mode from My Mode to Weather) and how bad it would occur. The flickering seemed worse with the bottom right-sided curve of gear 8 than what would occur with the same display area of gears 3 or 5.
Originally Posted by realityintrudes View Post
Flicker in just part of gear indication number
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Quote:
Originally Posted by bleppek
I also noticed this one time on my 22 HTC a few months ago on a drive. It only happened the one time and was gone the very next time I started the car. Hasn't happened again since (and I do watch for it now).
-Bryce
Driving the half-hour each way yesterday I found it inconsistent and relatively unpredictable as to when (ie, how long after I started driving, achieving and staying in a particular gear, if I changed drive mode from My Mode to Weather) and how bad it would occur. The flickering seemed worse with the bottom right-sided curve of gear 8 than what would occur with the same display area of gears 3 or 5.
Last edited by realityintrudes; Sep 21, 2022 at 05:20 AM. Reason: trying to show quotes from both
POSSE SENIOR RIDER
Joined: May 2003
Posts: 4,193
Likes: 695
From: Suffield, CT
Quote:
Originally Posted by realityintrudes View Post
Flicker in just part of gear indication number
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Quote:
Originally Posted by bleppek
I also noticed this one time on my 22 HTC a few months ago on a drive. It only happened the one time and was gone the very next time I started the car. Hasn't happened again since (and I do watch for it now).
-Bryce
Driving the half-hour each way yesterday I found it inconsistent and relatively unpredictable as to when (ie, how long after I started driving, achieving and staying in a particular gear, if I changed drive mode from My Mode to Weather) and how bad it would occur. The flickering seemed worse with the bottom right-sided curve of gear 8 than what would occur with the same display area of gears 3 or 5.
Originally Posted by realityintrudes View Post
Flicker in just part of gear indication number
Just crossed over 10k in my daily driven 2021 C8 Z51. Last night I noticed that in the bottom of the dash display gear indicator (where the big D with little numbers 1-8) number that the very edge bottom right-sided curvature in the number 5 was "flickering". It was as if the last column of illumination dots to the number were struggling to stay on. I was nearly home so I was not in a position to see if the same would occur with gear # 8, but it seemed like the same would happen as well to the bottom right edge curvature of the number 3 (but not the top right curvature of the # 3).
Have others experienced this? Does it portend bad things for my display in the future? Could it be something electrical or computer that will resolve itself? I will be looking closely on my drive in to work this AM. TIA
Quote:
Originally Posted by bleppek
I also noticed this one time on my 22 HTC a few months ago on a drive. It only happened the one time and was gone the very next time I started the car. Hasn't happened again since (and I do watch for it now).
-Bryce
Driving the half-hour each way yesterday I found it inconsistent and relatively unpredictable as to when (ie, how long after I started driving, achieving and staying in a particular gear, if I changed drive mode from My Mode to Weather) and how bad it would occur. The flickering seemed worse with the bottom right-sided curve of gear 8 than what would occur with the same display area of gears 3 or 5.
???
Instructor
Joined: Sep 2012
Posts: 143
Likes: 53
Intermediate
Joined: Mar 2008
Posts: 40
Likes: 28
From: Macomb, MI
I apologize if this has been asked before, but does anybody else have trouble with automatic downshifting from higher gears? I've noticed a bunch of times that I'll be in 7th or 8th gear and when I stomp on the gas nothing happens (except for slight increase in speed, of course). No downshift at all. This happens in normal mode or Z mode. Yesterday I was on the expressway doing 70 in 8th gear and tried to pass somebody fairly quickly. No downshift. So I watched the RPM once I manually downshifted to get around him. Under 2000 RPM in 7th or 8th gear there was no automatic downshift. Is this normal? Is there something I'm doing wrong?
Melting Slicks
Joined: May 2021
Posts: 2,562
Likes: 1,579
I apologize if this has been asked before, but does anybody else have trouble with automatic downshifting from higher gears? I've noticed a bunch of times that I'll be in 7th or 8th gear and when I stomp on the gas nothing happens (except for slight increase in speed, of course). No downshift at all. This happens in normal mode or Z mode. Yesterday I was on the expressway doing 70 in 8th gear and tried to pass somebody fairly quickly. No downshift. So I watched the RPM once I manually downshifted to get around him. Under 2000 RPM in 7th or 8th gear there was no automatic downshift. Is this normal? Is there something I'm doing wrong?
Try shifting to Sport and see what happens.
I have mine set to aggressive shifting (track settings) in Z mode. I don't see this happen much, nor does it see 7th or 8th gear much either when in track setting.
If you pull the downshift paddle and HOLD IT while hitting the gas, the DCT will command the lowest gear possible btw.