C8 problems
Drifting
Joined: Mar 2020
Posts: 1,568
Likes: 1,026
From: 31 hours East of Peoria, AZ
... and there were swinging rear plates too on some cars.
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
The issue with the updates is amazing to me. I bought a 2020 Silverado 2500HD Z71 Duramax last year with all of the electronics they put on those trucks. I've had two updates on it. One of them failed the first time but it worked the second time I did it. The second one worked with no issues. The battery has never been a problem with that truck because of an update. I know it doesn't have all of the microprocessors the C8 has, but it does have a lot of electronics on it.
Le Mans Master
Joined: Apr 2020
Posts: 6,379
Likes: 3,294
Thanks for the reminder. Page 19 of the OM for Driver's door. I suggest everyone looks at least once to see it. It is NOT obvious because you have to insert the the key (inside the fob) up vertically vs horizontally. I never saw it when I was installing my side inlet covers.
Last edited by C8J; Jun 15, 2021 at 11:17 AM.
Racer
Joined: May 2008
Posts: 399
Likes: 199
Update to dead battery issue: got a fix that does not involve flatbedding to dealer (assuming battery isn't damaged). I had first been using the CTEK (Corvette, from GM, plugs into port in ) charger to try and charge it back up, which kept failing. So I switched to a small Durabuilt charger which I've owned for a number of years and works great, connected directly to the battery terminals, and it failed, indicating a short in the battery. BUT, I posted about this in another forum, and was advised to disconnect the negative terminal and *then* try to charge. Bingo! It is now happily charging back up, no flatbed needed!! So now I just need to figure out how to kill that f***ing OTA update once I get it fully charged back up (assuming it holds a charge at that point)!!! Anyone know how to do this?
Last edited by improviz; Jun 15, 2021 at 11:56 AM.
Racer
Joined: May 2008
Posts: 399
Likes: 199
Yeah! I remember a car from like the 70's that a buddy of mine had (LeMans or something like that--I think) that had the gas fill behind the plate. That would be handy here, to be sure.
Instructor
Joined: Feb 2021
Posts: 154
Likes: 138
From: Mohave Desert
Hopefully GM is reading about all issues associated with the latest OTA update, delivery 3 weeks ago, 180 miles, $90K car, totally unresponsive, only things that work are door locks, mirrors and info center (Battery is NOT dead), everything is due to the latest update, all was good before Friday when I accepted the install. Stuck in park, tow truck is in route. What a POS.....this is my last GM, this is ridiculous. I've owned around 25 new cars in my lifetime, I have NEVER-EVER had an issue like this with a brand new car. GM, get you chi.....together or stop making cars/trucks.
Instructor
Joined: Feb 2021
Posts: 154
Likes: 138
From: Mohave Desert
Because the "kids" (Tadge must have skipped this part) building and designing these cars don't know what you know. It's why knowing your history is important - hence your ability to recall and produce examples of ideas which though old, might have worked better even on a modern supercar.
Le Mans Master
Joined: Apr 2020
Posts: 6,379
Likes: 3,294
Update to dead battery issue: got a fix that does not involve flatbedding to dealer (assuming battery isn't damaged). I had first been using the CTEK (Corvette, from GM, plugs into port in ) charger to try and charge it back up, which kept failing. So I switched to a small Durabuilt charger which I've owned for a number of years and works great, connected directly to the battery terminals, and it failed, indicating a short in the battery. BUT, I posted about this in another forum, and was advised to disconnect the negative terminal and *then* try to charge. Bingo! It is now happily charging back up, no flatbed needed!! So now I just need to figure out how to kill that f***ing OTA update once I get it fully charged back up (assuming it holds a charge at that point)!!! Anyone know how to do this?
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Melting Slicks
Joined: Sep 2020
Posts: 2,832
Likes: 2,149
From: Kelso, Wa
For those who have had to have (or did have) their car(s) towed with a dead battery,.... How did they get it into neutral so it could go on the flatbed, or did they use wheel dollies, or was there enough juice to ge the car in neutral (or does the engine need to be running to do that too?)
Burning Brakes
Joined: Sep 2020
Posts: 807
Likes: 562
For those who have had to have (or did have) their car(s) towed with a dead battery,.... How did they get it into neutral so it could go on the flatbed, or did they use wheel dollies, or was there enough juice to ge the car in neutral (or does the engine need to be running to do that too?)
seek out the Vette Guru Zymurgy for the knowledge. gifts of beer you shall receive thy answer
Racer
Joined: May 2008
Posts: 399
Likes: 199
Racer
Joined: May 2008
Posts: 399
Likes: 199
That is a total bummer and I would be/will be as frustrated if things go that way when I receive my car (June 28 TPW). We should not have to consider this, but I wonder if when updates come around, can you refuse or delay the update until convenient to get to a dealer and let them deal with it in case there are issues like yours? Ie, (I'm asking because I do not know) could you drive the car and just keep bypassing the update? Again, shouldn't have to but I am trying to preplan these things for when I actually have my car to mitigate downtime. Hope you get the issue resolved quickly!
Safety Car
Joined: Apr 2007
Posts: 4,547
Likes: 609
From: Southeast, WI
Iwas going to post the same thing. You just beat me to it. I totally agree. Maybe the reasoning was wanting to avoid a slight increase in cost?
Safety Car
Joined: Apr 2007
Posts: 4,547
Likes: 609
From: Southeast, WI
Cadillac's had that also, behind the tail light. Don't remember the year. As a 13 year old pumping gas at a Standard station, I had to become familiar with all the hidden places. There were quite a few.
Racer
Joined: May 2008
Posts: 399
Likes: 199
Update to dead battery issue: got a fix that does not involve flatbedding to dealer (assuming battery isn't damaged). I had first been using the CTEK (Corvette, from GM, plugs into port in ) charger to try and charge it back up, which kept failing. So I switched to a small Durabuilt charger which I've owned for a number of years and works great, connected directly to the battery terminals, and it failed, indicating a short in the battery. BUT, I posted about this in another forum, and was advised to disconnect the negative terminal and *then* try to charge. Bingo! It is now happily charging back up, no flatbed needed!! So now I just need to figure out how to kill that f***ing OTA update once I get it fully charged back up (assuming it holds a charge at that point)!!! Anyone know how to do this?
Burning Brakes
Joined: Sep 2020
Posts: 807
Likes: 562
Update: battery charged full-up successfully. Will reattach the negative cable tomorrow morning and see how it goes, definitely keeping battery shroud off until this is resolved! I hope that stupid OTA doesn't try to reinstall itself once the car gets power, anyone know how to prevent this?
Simply dont push the install icon, Cant recall at the moment, but I think in settings you have the option to download in background or not. i'd have to check again, someone around here will know, or just simply check your manual. Good luck
Racer
Joined: May 2008
Posts: 399
Likes: 199
So hopefully I can figure out a way to kill it off.
Advanced
Joined: Mar 2021
Posts: 61
Likes: 32
From: Brownsburg, Indiana
Just had my first check engine light come on. 2020 Z51 1LT. Not sure how long it was on because nothing changed in the performance of the car when I was driving it to the store. I was in a store parking lot when I noticed it. I to run into a store for something unrelated. When I came back after 20 minutes and started the car the light was gone. Scanned the for codes when I got home and got P0700 and P2856. I’ve seen P0700 and P2855 on the forum, but not P2856. Dealer can get me in the earliest next Tuesday to check it out. Opinions on driving it til then?