Should automobile software be open-sourced?

It should absolutely not be open-sourced. I know a few people in the car industry, and there is no doubt in my mind that in the long-term open-sourcing car software will make car-reliability worse.

1.Writing software for a car extensive domain knowledge about how a car works. Acquiring that knowledge is a lot more expensive than learning about computers.

2. It means writing better software helps your competitors. Cars are a red market, to get any market share you take it from someone else. Toyota is currently the market leader because they spend way more on engineering, and they work harder than the big three. I've talked to mech. engineers at Ford and Toyota, and there is no doubt in my mind that I'm safer in a defective Prius than I am in a defect-free Ford Taurus. Toyota does a better job than the big three at every step in the design and manufacture of a car.