C8 problems
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
Pro
Joined: May 2021
Posts: 514
Likes: 339
From: Central MA near 495 and The Pike
If the infotainment stays on after you open the door
- Key Off
- Infotainment stays on as designed (normal)
- Open Door
- Infotainment stays on (not normal)
- Close Door
- Infotainment stays on (not normal)
- Open Door
- Close Door
- Open Door
- Start C8
- Close Door
- Key Off
- Open Door
- Close Door
- Wait
- Infotainment eventually goes off.
I only initiate updates (in any of my GM cars) when the car is safely parked on my driveway. As a practice, I will NEVER initiate an update in a parking lot, or anywhere else I don't want to be stranded.
Anyway, the "infotainment stays on" behavior seems to go away after the update. Maybe just coincidence.
Instructor
Joined: Feb 2015
Posts: 182
Likes: 49
From: Edmonton Alberta
I tried turning on the tilting feature of the side view mirrors. When I put the car in reverse, the mirrors tilted downward to give a view of the ground and rear sides of the car. Fine. Then when I shifted into DRIVE, the mirrors stayed tilted down. Owner's manual says they should return to normal position when shifting out of reverse. I turned the tilting feature off and have not yet retried it.
But, I am not completely bought in to the feature as then tend to tilt too low IMO.
Burning Brakes
Joined: Jan 2018
Posts: 960
Likes: 461
From: Newport Beach Kalifornia
Quirk with infotainment system. Drove it for 30 min. Parked for a bit and on restart the infotainment system reset itself to factory settings.
I had to accept terms, reload apps and rearrange the icons to my likings.
No update installed AFAIK. Strange.
I had to accept terms, reload apps and rearrange the icons to my likings.
No update installed AFAIK. Strange.
Melting Slicks
Joined: Apr 2021
Posts: 2,752
Likes: 2,323
From: Simi Valley, CA
2022 C8 of the Year Finalist - Modified
I just had something happen that has been reported here before. I started the car and the the infotainment screen was blank. Tried several things on the drive home to get it to turn back on but nothing worked. I got home, shut off the car then started it again (still dark), then turned the car off and left the driver's door open for a while (I think you have to leave it open at least 90 seconds). The next time I started the car everything was back to normal. Computers - if all else fails, reboot (or, in this case, clear the cache/comm channels).
Advanced
Joined: Aug 2022
Posts: 73
Likes: 62
From: N of Tampa, FL
Same thing here. Ive had it happen a few times over the last month. I havent seen any message to update either. Mine goes in Tuesday for that and an Onstar issue.
Melting Slicks
Joined: Feb 2006
Posts: 2,261
Likes: 1,431
From: Brentwood CA
I've posted this a few times before but worth another post. 
Do this to erase the car/computer cache. Start the car. Shut the car off. Then open the drivers side door for 90 seconds (and you have to have it open for no less than 90 seconds). Close door, start the car and the computer cache has now been reset. Watch the video using the link below at the 1:44:46 mark.
What this does is to clear out the computers cache and hopefully correct the problem.
Do this to erase the car/computer cache. Start the car. Shut the car off. Then open the drivers side door for 90 seconds (and you have to have it open for no less than 90 seconds). Close door, start the car and the computer cache has now been reset. Watch the video using the link below at the 1:44:46 mark.
What this does is to clear out the computers cache and hopefully correct the problem.
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Instructor
Joined: Oct 2014
Posts: 236
Likes: 163
Weird issue today. While waiting for the touchless car wash I had been waiting about 15 mins. Move forward about 20ft and the horn started blaring. Would not stop. I put in park, I put back in drive. Nothing. I turned the car off and back on and didn't seem to do anything. I turned it off and opened the door and it turned off within 5 seconds. Turned it back on and it was fine. Car only has about 180 miles on it. Anyone had this happen? Was it mad at me for idling while waiting in line? Thanks
Now at home about 45 mins later the horn just randomly started going off in the garage. I used the remote to lock and unlock it and it didn't stop. I turned the car on and about 5 seconds later the horn stopped.
I searched above for information on the issue for 30 mins and gave up after I couldnt find anything as the thread seems to be saturated with mostly bitching...
Now at home about 45 mins later the horn just randomly started going off in the garage. I used the remote to lock and unlock it and it didn't stop. I turned the car on and about 5 seconds later the horn stopped.
I searched above for information on the issue for 30 mins and gave up after I couldnt find anything as the thread seems to be saturated with mostly bitching...
Last edited by aquake; Feb 11, 2023 at 04:32 PM.
Instructor
Joined: Oct 2014
Posts: 236
Likes: 163
Just some odd stuff in general
Le Mans Master
Joined: Aug 2004
Posts: 6,412
Likes: 1,295
From: Bluffton, SC
Weird issue today. While waiting for the touchless car wash I had been waiting about 15 mins. Move forward about 20ft and the horn started blaring. Would not stop. I put in park, I put back in drive. Nothing. I turned the car off and back on and didn't seem to do anything. I turned it off and opened the door and it turned off within 5 seconds. Turned it back on and it was fine. Car only has about 180 miles on it. Anyone had this happen? Was it mad at me for idling while waiting in line? Thanks
Now at home about 45 mins later the horn just randomly started going off in the garage. I used the remote to lock and unlock it and it didn't stop. I turned the car on and about 5 seconds later the horn stopped.
I searched above for information on the issue for 30 mins and gave up after I couldnt find anything as the thread seems to be saturated with mostly bitching...
Now at home about 45 mins later the horn just randomly started going off in the garage. I used the remote to lock and unlock it and it didn't stop. I turned the car on and about 5 seconds later the horn stopped.
I searched above for information on the issue for 30 mins and gave up after I couldnt find anything as the thread seems to be saturated with mostly bitching...
Instructor
Joined: Oct 2014
Posts: 236
Likes: 163
I've owned my C8 about two months now. The first five weeks, my alarm horn went off on its own several times. I did get an OnStar notification that the alarm went off due to the door or trunks being ajar but, when I checked, everything was closed properly … and the car had shut down with no warnings about anything being open. In my case, I was able to stop the horn by unlocking with the fob. After ten minutes, it times out on its own anyway. About three weeks ago I decided to try a computer reset. Shut the car off, opened the driver's door for 90 seconds, closed the door, then restarted the car. It hasn’t done it since. Not completely confident that the problem has gone away, but good so far. If it does it again, it'll go the the dealer to see if they can figure it out. My suspicion is that it may be an intermittent alarm sensor. It was getting to the point that I was afraid to lock the car.
I havent been locking the car, just seems random and goes away randomly also. No consistency in what I do to make it stop and once it just seemed to stop by itself after 10ish seconds. This is also a steady horn noise, not alarm like. I will keep the computer reset in mind!!
Le Mans Master
Joined: Aug 2004
Posts: 6,412
Likes: 1,295
From: Bluffton, SC
Thanks for the advice!!!
I havent been locking the car, just seems random and goes away randomly also. No consistency in what I do to make it stop and once it just seemed to stop by itself after 10ish seconds. This is also a steady horn noise, not alarm like. I will keep the computer reset in mind!!
I havent been locking the car, just seems random and goes away randomly also. No consistency in what I do to make it stop and once it just seemed to stop by itself after 10ish seconds. This is also a steady horn noise, not alarm like. I will keep the computer reset in mind!!
Instructor
Joined: Oct 2014
Posts: 236
Likes: 163
Instructor
Joined: Oct 2014
Posts: 236
Likes: 163
Horn didnt go off at all since. I have now taken it off the tender and closed the frunk to see if if happens with those off/shut. The primary FOB would still not open the frunk. I went and got the second FOB and it opened the frunk exactly once. Never worked again. Trunk opens fine and all other actions work fine on both FOBs. Using the button to open the frunk under the bumper works fine. I tried the computer reset, no change. Not sure what to do next so I guess maybe a trip to MM.
Instructor
Joined: Oct 2014
Posts: 236
Likes: 163
Intermediate
Joined: Feb 2023
Posts: 43
Likes: 21
mine is in the shop now for:
1. my PDR SD Card intermittently works. It shows up as available, then as missing, back to available, then as missing, etc...
2. wrinkled/loose leather on my passenger seat
3. mis-aligned ground effect on driver's side (dealership issue)
4. missing black lug nuts (dealership issue)
1. my PDR SD Card intermittently works. It shows up as available, then as missing, back to available, then as missing, etc...
2. wrinkled/loose leather on my passenger seat
3. mis-aligned ground effect on driver's side (dealership issue)
4. missing black lug nuts (dealership issue)