There is no such thing as transferring out of UC Davis, or any school for that matter. YOU JUST LEAVE. What is UC Davis going to do, help you transfer to another school? Uhhhhhhh......... NO.
Like collegemom16 said, what you should be concerned about is contacting the school that you want to head to next and find out the procedures of getting into said school, including the transfer of any completed units if applicable, etc.
If you are not a successful UCD student with grades to show for it, then tough luck getting into another UC, except maybe UCR and UCM.