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GMC Sierra, Bolt, Sky, Mach E
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Most likely a 12V issue. I don't remember if there's a way to see the 12V Voltage on the screens at all
I have not seen an EV yet with a 12V display, but my Mach E does have a display that tells me when it is charging the 12V. You can buy a volt meter that plugs into the 12V socket, some folks have done that.
 

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GMC Sierra, Bolt, Sky, Mach E
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Since these are AGM batteries, it is also possible that at some point, when the vehicle is parked in Flint, or upon arriving at the dealer, they hook up a standard charger and end up damaging the AGM. Look at the warnings in the manual that Nebula posted.
 

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GMC Sierra, Bolt, Sky, Mach E
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Trying to run updates via a cell connection would be an easy source of a parasitic drain on the 12v.
My Mach E downloaded 2 OTAs yesterday, while driving. Of course the 12v is kept charged while driving. Even without Wi-Fi, if plugged in it should maintain the 12v battery. My very first OTA was while parked at a hotel all night with no Wi-Fi connection in the car.
 
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