Originally Posted by alexwhittemore
The key reader stores a bunch of diagnostic info, including the battery voltage as of last removal. I forget why, but there you go
For that matter, the car can check its own voltage, which you can read with an INPA cable. You can open the trunk and measure it with a multimeter, but then, hey, why bother.
so i guess what the key reader is saying 13.8v is fine then?