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GMC Gas / Diesel / EV Technician
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Why are the12v batteries going dead? Defective? I thought the drive batteries keep the 12v charged.
It will until the main battery gets so low. 30% charge and letting it sit 5 days is the problem. The vehicle still runs the cooling system to maintain battery temps. Plus if the software did a OTA update during that time. Real question is why was it allowed to sit 5 days at such a low state of charge anyway? Plug it in when you go on trips
 
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