California laws are quite peculiar.
As I've told you before, you either need to speak with a California lawyer, or you need to do some serious legal research on your own.
I don't believe that there's anybody on this forum who is completely competent to give you legal advice on the peculiarities of California gun and self-protection law. Including me.
In California, you have the duty to retreat, even within your own home.
If you stash a handgun in the back of your car, it had better be unloaded, and in a separate container from its ammunition.
Go talk to an attorney.