C8 problems
2nd Gear
Joined: May 2022
Posts: 2
Likes: 0
Instructor
Joined: Feb 2020
Posts: 240
Likes: 139
From: San Jose, California
I have a 23 C8 and wonder if anyone has these problems.
1. When I put the conv top back up…the passenger window will close then open about an inch. I try to close it band it opens back up about an inch. Have to close a few times before it actually stays closed.
2. When I get a full take of gas…the until empty never seems the same. It one day will show, say 388 until empty. The next time it could be as much as 425. I thought maybe the gas station pump didn’t fill all the way but when it’s in the 300s on full…I can drive 100 miles and the gauge will only go down maybe 30 miles Each time it’s different.
1. When I put the conv top back up…the passenger window will close then open about an inch. I try to close it band it opens back up about an inch. Have to close a few times before it actually stays closed.
2. When I get a full take of gas…the until empty never seems the same. It one day will show, say 388 until empty. The next time it could be as much as 425. I thought maybe the gas station pump didn’t fill all the way but when it’s in the 300s on full…I can drive 100 miles and the gauge will only go down maybe 30 miles Each time it’s different.
#2 the algorithm appears to be based on last known MPG - When I travel around town, it is lower figure. When I take long trip (e.g. 400 miles to Santa Barbara from San Jose), the empty figure is higher. I consider the behavior 'normal' but admittedly a bit confusing.
Race Director
Joined: Aug 2016
Posts: 12,763
Likes: 10,194
From: Garden Valley CA
#1 happens to my 23 C8 HTC randomly - attributed to computer glitch that abound with any modern car. I don't like it but accept that is the behavior - the car is a composite of computers and behaves according. Requiring reboots, etc.
#2 the algorithm appears to be based on last known MPG - When I travel around town, it is lower figure. When I take long trip (e.g. 400 miles to Santa Barbara from San Jose), the empty figure is higher. I consider the behavior 'normal' but admittedly a bit confusing.
#2 the algorithm appears to be based on last known MPG - When I travel around town, it is lower figure. When I take long trip (e.g. 400 miles to Santa Barbara from San Jose), the empty figure is higher. I consider the behavior 'normal' but admittedly a bit confusing.
Racer
Joined: Sep 2021
Posts: 316
Likes: 269
From: Lawrenceville, GA
I have a 23 C8 and wonder if anyone has these problems.
1. When I put the conv top back up…the passenger window will close then open about an inch. I try to close it band it opens back up about an inch. Have to close a few times before it actually stays closed.
2. When I get a full take of gas…the until empty never seems the same. It one day will show, say 388 until empty. The next time it could be as much as 425. I thought maybe the gas station pump didn’t fill all the way but when it’s in the 300s on full…I can drive 100 miles and the gauge will only go down maybe 30 miles Each time it’s different.
1. When I put the conv top back up…the passenger window will close then open about an inch. I try to close it band it opens back up about an inch. Have to close a few times before it actually stays closed.
2. When I get a full take of gas…the until empty never seems the same. It one day will show, say 388 until empty. The next time it could be as much as 425. I thought maybe the gas station pump didn’t fill all the way but when it’s in the 300s on full…I can drive 100 miles and the gauge will only go down maybe 30 miles Each time it’s different.
1. For 14 months when I held button to close top the windows would go down if they were up, too would close, and then windows would close all the way. Then for about a month windows would go down, too would go up, windows would go up, then DRIVER side window would go down two inches. Like you, I’d have to re-raise it but mine raised on first attempt. After a month it went back to “normal”. Don’t know for sure but think it fixed itself after an over the air update.
2. Others have said it but miles to empty is based on previous driving experience. I once filled up and it said something like I had 315 miles to empty. Drove 90 miles on the freeway to a friends house at a leisurely pace and it said 325 miles to empty when I got there. Point is I probably got 16 MPG on previous tank because I was pushing it and closer to 28 on my leisurely trip so it was adjusting to current trip experience and basing remaining miles accordingly. And that remaining miles number adjusts in real time.
Burning Brakes
Joined: Jan 2018
Posts: 964
Likes: 462
From: Newport Beach Kalifornia
I have a 23 C8 and wonder if anyone has these problems.
1. When I put the conv top back up…the passenger window will close then open about an inch. I try to close it band it opens back up about an inch. Have to close a few times before it actually stays closed.
2. When I get a full take of gas…the until empty never seems the same. It one day will show, say 388 until empty. The next time it could be as much as 425. I thought maybe the gas station pump didn’t fill all the way but when it’s in the 300s on full…I can drive 100 miles and the gauge will only go down maybe 30 miles Each time it’s different.
1. When I put the conv top back up…the passenger window will close then open about an inch. I try to close it band it opens back up about an inch. Have to close a few times before it actually stays closed.
2. When I get a full take of gas…the until empty never seems the same. It one day will show, say 388 until empty. The next time it could be as much as 425. I thought maybe the gas station pump didn’t fill all the way but when it’s in the 300s on full…I can drive 100 miles and the gauge will only go down maybe 30 miles Each time it’s different.
Instructor
Joined: Mar 2016
Posts: 143
Likes: 145
From: St. Augustine, FL
I can't believe all the fuss over "ESTIMATED" miles to go. If you don't like the estimate just ignore it and look at the line guage instead as it shows actual fuel remaining.
Why does every little thing NOT as *you* expect things the cause of so much rancor? It's only an ESTIMATE based on previous driving.
Just drive your cars and enjoy them and stop looking for every possible little thing different than your expectations. It's only a car and only a mass produced car that is not as expensive as a BIG SUV fully loaded or even a deluxe pickup truck.
Why does every little thing NOT as *you* expect things the cause of so much rancor? It's only an ESTIMATE based on previous driving.
Just drive your cars and enjoy them and stop looking for every possible little thing different than your expectations. It's only a car and only a mass produced car that is not as expensive as a BIG SUV fully loaded or even a deluxe pickup truck.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
I can't believe all the fuss over "ESTIMATED" miles to go. If you don't like the estimate just ignore it and look at the line guage instead as it shows actual fuel remaining.
Why does every little thing NOT as *you* expect things the cause of so much rancor? It's only an ESTIMATE based on previous driving.
Just drive your cars and enjoy them and stop looking for every possible little thing different than your expectations. It's only a car and only a mass produced car that is not as expensive as a BIG SUV fully loaded or even a deluxe pickup truck.
Why does every little thing NOT as *you* expect things the cause of so much rancor? It's only an ESTIMATE based on previous driving.
Just drive your cars and enjoy them and stop looking for every possible little thing different than your expectations. It's only a car and only a mass produced car that is not as expensive as a BIG SUV fully loaded or even a deluxe pickup truck.
I'm old school and don't trust computers. If I want to figure out estimated MPG, I would rather divide the miles driven by the gallons used on an full tank of fuel to near empty fuel tank even though that has nothing to do with what "Estimated" miles left till empty. There will be a difference anyway between the two estimates but they do come close.
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Instructor
Joined: Feb 2009
Posts: 217
Likes: 92
From: BRIGHTWATERS NY
1st oil change 3200 mile
2023 2LT Z51..Oil change message came up at 3200 brought it into Huntington Chevrolet eric was the vet tech … did the oil and filter and tranny filter which is all covered under GM… no issues ..everything came up clean good to go no problems… highly recommend huntinton chevrolet ask for eric he’s awesome…love this car and highly recommend owning one… thank you Chevrolet for getting it right
🤙😎🇺🇸
🤙😎🇺🇸
Safety Car
Joined: Dec 1999
Posts: 4,718
Likes: 1,460
From: Virginia Beach, VA & Port Charlotte, FL
2023 2LT Z51..Oil change message came up at 3200 brought it into Huntington Chevrolet eric was the vet tech … did the oil and filter and tranny filter which is all covered under GM… no issues ..everything came up clean good to go no problems… highly recommend huntinton chevrolet ask for eric he’s awesome…love this car and highly recommend owning one… thank you Chevrolet for getting it right
🤙😎🇺🇸
🤙😎🇺🇸
Racer
Joined: Oct 2023
Posts: 356
Likes: 386
I believe Borla is GM approved
Since Borla are OEM option on C8, doesn’t that make GM approved aftermarket products protected WRT voiding warranty?
I noticed on Rick Conti’s YT channel, they mention installing aftermarket Borlas.
My dealer has also said they will install aftermarket products when my C8 arrives. I’ll REALLY test this relationship when I ask them to install lowering springs. …hoping using springs (not collars) will preserve the warranty on my front lift, etc. We’ll see.
I noticed on Rick Conti’s YT channel, they mention installing aftermarket Borlas.
My dealer has also said they will install aftermarket products when my C8 arrives. I’ll REALLY test this relationship when I ask them to install lowering springs. …hoping using springs (not collars) will preserve the warranty on my front lift, etc. We’ll see.
Safety Car
Joined: Dec 1999
Posts: 4,718
Likes: 1,460
From: Virginia Beach, VA & Port Charlotte, FL
Since Borla are OEM option on C8, doesn’t that make GM approved aftermarket products protected WRT voiding warranty?
I noticed on Rick Conti’s YT channel, they mention installing aftermarket Borlas.
My dealer has also said they will install aftermarket products when my C8 arrives. I’ll REALLY test this relationship when I ask them to install lowering springs. …hoping using springs (not collars) will preserve the warranty on my front lift, etc. We’ll see.
I noticed on Rick Conti’s YT channel, they mention installing aftermarket Borlas.
My dealer has also said they will install aftermarket products when my C8 arrives. I’ll REALLY test this relationship when I ask them to install lowering springs. …hoping using springs (not collars) will preserve the warranty on my front lift, etc. We’ll see.
Racer
Joined: Feb 2023
Posts: 400
Likes: 349
From: Camp Hill, PA
My C8 was built 8/2/23 and delivered 9/9/23, I absolutely love the C8. Still have not cracked the 500-mile threshold due to installation of PPF/Ceramic coat, weather in PA and work. Mostly likely won't happen until spring of '24. With all the posts about dead batteries, transmissions issues and non-starting vehicles, am I the only one who suffers from the anxiety of being stranded somewhere when I do take the C8 out? I find myself crossing my fingers when I push the "start" button and I always put it on the tender whenever parked at home...Am I the only one?
Drifting
Joined: Nov 2012
Posts: 1,670
Likes: 1,404
From: Central Ohio
My C8 was built 8/2/23 and delivered 9/9/23, I absolutely love the C8. Still have not cracked the 500-mile threshold due to installation of PPF/Ceramic coat, weather in PA and work. Mostly likely won't happen until spring of '24. With all the posts about dead batteries, transmissions issues and non-starting vehicles, am I the only one who suffers from the anxiety of being stranded somewhere when I do take the C8 out? I find myself crossing my fingers when I push the "start" button and I always put it on the tender whenever parked at home...Am I the only one?
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
My C8 was built 8/2/23 and delivered 9/9/23, I absolutely love the C8. Still have not cracked the 500-mile threshold due to installation of PPF/Ceramic coat, weather in PA and work. Mostly likely won't happen until spring of '24. With all the posts about dead batteries, transmissions issues and non-starting vehicles, am I the only one who suffers from the anxiety of being stranded somewhere when I do take the C8 out? I find myself crossing my fingers when I push the "start" button and I always put it on the tender whenever parked at home...Am I the only one?
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
2023 2LT Z51..Oil change message came up at 3200 brought it into Huntington Chevrolet eric was the vet tech … did the oil and filter and tranny filter which is all covered under GM… no issues ..everything came up clean good to go no problems… highly recommend huntinton chevrolet ask for eric he’s awesome…love this car and highly recommend owning one… thank you Chevrolet for getting it right
🤙😎🇺🇸
🤙😎🇺🇸
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
My C8 was built 8/2/23 and delivered 9/9/23, I absolutely love the C8. Still have not cracked the 500-mile threshold due to installation of PPF/Ceramic coat, weather in PA and work. Mostly likely won't happen until spring of '24. With all the posts about dead batteries, transmissions issues and non-starting vehicles, am I the only one who suffers from the anxiety of being stranded somewhere when I do take the C8 out? I find myself crossing my fingers when I push the "start" button and I always put it on the tender whenever parked at home...Am I the only one?
Drifting
Joined: Apr 2021
Posts: 1,560
Likes: 1,074
I don’t daily drive the C8 so I leave it on a maintainer up on a lift. Every time I lower the car to take it out I manually check for updates before disconnecting the maintainer. I check for updates while the maintainer is still connected and I am on my home Wi-Fi. Roll down the windows if you have an update and check back in ten minutes. Don’t let it go through the circle of death all night while trying to install the update. Sam
Heel & Toe
Joined: Jul 2023
Posts: 20
Likes: 7
Not really problems per-say, but just got my C8 a few days ago. After a few days of driving there's been 2 issues that seem design orientated rather than just needing to be broken in and was hoping for a quick solution.
1. The doors don't open fully when pressing the interior release. It'll do a half open, and I'll have to hit the button again for it to fully open. I read about some people having similar issues online, but it's not a big enough priority to go to a shop asap and was just gonna mention it when I get my first service, but was wondering if there's an easier solution or a setting I'm missing.
2. This is me being stupid, but I can't figure out how to turn shuffle on/off for my usb music. And other settings for that matter though, I just see the play/pause, and some more audio centric settings, but I don't actually just see a shuffle/repeat button like I'd expect to exist. I could just go through my phone, but I like preserving the battery and data if I don't need to waste it. I didn't see anything online about this, so it might just be GM's new system and everyone is using carplay?
3. It's been raining every day since I brought it home.
Sorry if it's been discussed already.
1. The doors don't open fully when pressing the interior release. It'll do a half open, and I'll have to hit the button again for it to fully open. I read about some people having similar issues online, but it's not a big enough priority to go to a shop asap and was just gonna mention it when I get my first service, but was wondering if there's an easier solution or a setting I'm missing.
2. This is me being stupid, but I can't figure out how to turn shuffle on/off for my usb music. And other settings for that matter though, I just see the play/pause, and some more audio centric settings, but I don't actually just see a shuffle/repeat button like I'd expect to exist. I could just go through my phone, but I like preserving the battery and data if I don't need to waste it. I didn't see anything online about this, so it might just be GM's new system and everyone is using carplay?
3. It's been raining every day since I brought it home.
Sorry if it's been discussed already.
Melting Slicks
Joined: Apr 2021
Posts: 2,756
Likes: 2,323
From: Simi Valley, CA
2022 C8 of the Year Finalist - Modified
Problem #1) A common complaint among new C8 owners. It's the way the door release works. Press and HOLD the button and PUSH the door open before releasing the button. It will work with one press.
