this post was submitted on 11 Oct 2024
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Maybe I'm missing something here, but OnStar is a 3rd party service, so it makes sense they would have a bolt-on device that can be removed without too much concern for the rest of the car's functionality.
Also, isn't a TCU something that controls a car's drivetrain and transmission?
Edit: nevermind, just searched and found telematic control unit. Interesting, thanks for the info, I might look into this more if I have more time later.
TCM is the thing that controls the transmission