Cal. Veh. Code § 6300
Except as provided in Sections 5905, 5907, and 5908, no security interest in any vehicle registered under this code, irrespective of whether the registration was effected prior or subsequent to the creation of the security interest, is perfected until the secured party or his or her successor or assignee has deposited, either physically or by electronic transmission pursuant to Section 1801.1, with the department, at its office in Sacramento, or at any other office as may be designated by the director, a properly endorsed certificate of ownership to the vehicle subject to the security interest showing the secured party as legal owner if the vehicle is then registered under this code, or, if the vehicle is not so registered, an application in usual form for an original registration, together with an application for registration of the secured party as legal owner, and upon payment of the fees as provided in this code.
Ca. Veh. Code § 6300