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I think it's up to the car makers to make it available if they want, and perfectly ok for the customer to hack and then modify it if they want. Sort of like a smart phone. Some car makers are great about working with the aftermarket and the customer to open up the computer. Ford does this with the Mustang, I think they release the computer and all the programming before the car even comes out. Chrysler on the other hand keeps everything as difficult as possible. Their stuff still gets opened sooner or later but it takes extra time and effort.
I like the current setup, it's not illegal to keep it proprietary but once the car is sold it is no longer the property of the manufacturer and can then be hacked and modified by the owner. The government can continue to check that they are within pollution and safety laws but modifications shouldn't automatically be deemed non-compliant.
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