That's not all that practical. Modern cars are rolling datacenters. Most have 50-100 computers in them that are on several different networks. Features are dist

That's not all that practical. Modern cars are rolling datacenters. Most have 50-100 computers in them that are on several different networks. Features are distributed over several nodes ("ECUs") and everything is statically linked and scheduled. (i.e. almost no OS akin to what you would find on a PC or smartphone) It's very difficult to do anything complex without having special tools and know-how. Which someone at a shop just won't ahve, because a shop does not debug the software. They just fix hardware issues, which as far as ECUs are concerned just means changing faulty parts for new ones. source: I work on this, but not for GM.