If your corporation (via it's self driving software) kills someone, the corporation will "go to jail", a C level exec does the jailtime and the entire company will be unable to carry on any of it's normal business for the duration of the sentence (while still being held responsible for it's obligations to staff/suppliers/cerditors). If that self driving software is judged to be liable for a traffic infringement, the corporation will pay an amount equal to the percentage of income that a human driver would have paid. If it's an infringement with a ~$400 fine, the corporation should pay ~0.5% of their annual income - the same sort of penalty as "an average salary" person.
A couple of $20mil fines and a 6 month total company shutdown would be very "proactive" in encouraging Tesla to get Elon to shut the fuck up with his big bold claims that cannot be backed up. If Uber had been slapped with the "corporate personhood" equivalent of whatever penalty a human driver who'd killed that person crossing the road with a bicycle they'd be far more circumspect about using minimum wage contractors as "safety drivers" in their prototypes.
(I can dream, right?)