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Battery question

Brahmajoe

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So I went out a couple weeks ago doors wouldn’t unlock, no start battery was 2v.

Replaced both batteries and truck has all power but when turned to run position I get a check engine light.

Once running no check engine light.

At a stop start battery voltage drops to 12.3 which isn’t terrible but it lights it up in red. Does anybody know what can be going on? No drivability issues and when I check for codes it doesn’t show any present
 

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