Legal Question in Traffic Law in California

I'm not sure what you mean by "what happens?"

If you received a citation, and either didn't appear or didn't pay off finds it is connected to you irrespective of address. Your license can be suspended, additional civil assessment ($300 fine stacked on) will be added.

Now that your citation has been sent to collections, your license is also probably suspended for failing to pay the fine. The only way to get a hold lifted on your license from failing to pay is to go to court and pay off the entire amount of the fine.