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As a long time retired computer programmer, I have told friends to beware of the time someone gets access to Onstar. It could then be possible to disable every GM vehicle by indicating the vehicle stolen. A million cars stranded on the road...
All cars since at least 1994 have an OBD port, usually under the dash on the left. No mechanic can work on these cars without one, they just don't know how to repair a car if the car doesn't tell them what is wrong. Even with the cars older than 2001, mechanics just don't know to trouble shoot. Don't fault the mechanic, they just aren't taught and the younger ones don't know enough to use logic.
The only codes common to all cars are those related to emissions. Car companies have their own codes, which are more detail than the generic Pnnnn codes and address things like ABS, SRS, power seats, climate control, and any other computer board. There are a few code readers that can access all of these codes, but the learning curve is usually long and hard.
It doesn't matter which state you move to, it is the job that counts. Remember, the Midwest uses an ungodly amount of road salt and rust is rampant.
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My back feels better when I sit in a Volvo seat
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