Another Dead Battery

[Jav_eee]

There is a TSB on this and it has to do with a short in a wire harness somewhere

Do you have a tsb number or something?


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[ILSilverado]

5 hours ago, Jav_eee said:

Do you have a tsb number or something?


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I do not off hand but I did see it listed here somewhere. Your dealer should be able to access it. It has to do with a short in a wiring harness causing battery drain.

[Roch]

I have a 2020 Chevy Silverado 1500 LT Z71 5.3 2000 miles that also had dead battery in the morning. Used jumper box to start then drove around the block and returned home and it wouldn’t shut off nothing worked! Got it to the dealer later that day they said it was fix? Check engine light back on before I got Home.Brought it back to the dealer and they had it for four days and couldn’t find anything wrong  but changed battery? On the ride home voltage gauge was dropping to 12 while driving then going to 14 at stops? Called dealer and was told that is normal? I think there is an issue with these trucks! Any one else have similar problem?

Edited April 26, 2021 by Roch
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[lebag335]

On 4/25/2021 at 8:41 PM, Roch said:

On the ride home voltage gauge was dropping to 12 while driving then going to 14 at stops?

Normal.

[michaeldc46]

I had a bad seat memory control module - dealer needs to run a parasitic battery drain test - my seat control module tried to communicate 290 times over a weekend at the dealer and drained the battery - GM just came out with a newly designed module - installed and no problems since.

 

[Roch]

Thanks after 4 days in the shop and two over night battery tests it showed no drain on battery. Second overnight test was done with new battery. My concern is the fluctuations in the voltage gauge, it acts more like an oil pressure gauge ? There saying it’s normal but on cold start gauge reads 16-18 volts and after driving a while it drops to 10-12 volts and then raises to 14 when I come to a stop. Only time will tell. The two pictures show gauge after warm parked and moving?Thanks rich (roch typo)

[Vigilante375]

From what I recall, the voltage changing is normal. GM designed it to change based on the voltage needs.

 

I think it's been around for a decade or more now.