Electrical Issues C8

[Davigar]

Hello. I have a 2020 C8 and have had electrical issues from 18 months on. About 5 times, I have come out in the morning and found my battery dead. In fact, I replaced my battery about 3 months ago as dealer said it was defective. Well, it was not defective, as battery died again about 2 weeks ago. I just left at the dealer for a few days and cost me $600 to run a continual diagnostic to see if it can determine what is still running that would drain the battery. Could be anything ie door locks, radio etc. Something that occasionally is still running when car is off, causing battery drain. Dealer found nothing because nothing was still running when car was shut off. Very periodic issues.
Anyone else have this issue with any of their C8's?

 

[Murray20c8]

Only with an update that wouldn't .... update. It left the car electronics on. I knew it was an update though. So I doubt that's your problem.

 

[Mr.Corvette]

Are you door release buttons fully popping back out? I know one other person in my Corvette club with a 2020 Coupe who has random issues with his windows dropping because the button is not fully popping out still after having it replaced. A stuck button would put a drain on the battery beyond what all the computers drain naturally.
If your car is sitting for more than 2 weeks you need to plug in a charger with the natural battery drain.

 

[Vetted]

There is a recall out N242435630 for the serial data gateway module.. it can drain the battery. I think that’s what Murray is referring to above.

 

[Vetted]

There is a remedy I believe it is an update. To fix the update

 

[Davigar]

Are you door release buttons fully popping back out? I know one other person in my Corvette club with a 2020 Coupe who has random issues with his windows dropping because the button is not fully popping out still after having it replaced. A stuck button would put a drain on the battery beyond what all the computers drain naturally.
If your car is sitting for more than 2 weeks you need to plug in a charger with the natural battery drain.

Not sure what you mean by door release buttons?

 

[1st Vette]

Not sure what you mean by door release buttons?

Check this out. May tell you what is causing it. Looks like reasonable steps to take, makes sense.

https://www.perplexity.ai/search/how-can-i-check-for-parasitic-oz_j6g8vS3agvEpr3fGjEA

 

[Davigar]

Check this out. May tell you what is causing it. Looks like reasonable steps to take, makes sense.

https://www.perplexity.ai/search/how-can-i-check-for-parasitic-oz_j6g8vS3agvEpr3fGjEA

Thanks for this. The challenge is excessive draw seems to happen only once in awhile (ie. The battery has only gone dead 4-5 times in 4 years), so difficult to pick up by monitoring only occasionally if that makes sense. Thanks for this info as I will try it.

 

[Mr.Corvette]

Check this out. May tell you what is causing it. Looks like reasonable steps to take, makes sense.

https://www.perplexity.ai/search/how-can-i-check-for-parasitic-oz_j6g8vS3agvEpr3fGjEA

Good video. The button on the door is the one you press to get out.

 

[1st Vette]

Thanks for this. The challenge is excessive draw seems to happen only once in awhile (ie. The battery has only gone dead 4-5 times in 4 years), so difficult to pick up by monitoring only occasionally if that makes sense. Thanks for this info as I will try it.

Just a suggestion but perhaps you should connect a trickle charger to your battery and keep it plugged in when not in use. If you don’t already. Also in general I believe that there is less “ strain “ on the battery when drawing current, starting for example , when the battery is fully charged. As you know a 12 volt battery should show just under 13 volts when fully charged. It should show 13.5 to 14.5 with the vehicle running due to alternator output. Good luck with your troubleshooting.

 

[RobertsC8]

There is a recall out N242435630 for the serial data gateway module.. it can drain the battery. I think that’s what Murray is referring to above.

I Had this software update done on Tuesday when my car was in for DCT filter change.i hope there is no problems from the update-all seems good for now.