Cascading codes all of a sudden

[Master Chief BT]

When my batteries went bad, my truck still started and ran but crazy things would happen. Turned out one battery was completely dead and the other battery was trying to supply 13 volts but just couldn’t keep up. I was told that some of these electronic systems don’t see a specific voltage they don’t work just like Phil-AT4 described also. With that many codes all at once and knowing GM had bad battery issues in the 2024 model year, I would just replace the batteries. Have to replace both too and not just one. At least that’s what I’ve been told. Following….

 

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