Cal. Insurance Code - INS § 655. Section 655.
Every insurer issuing policies of motor vehicle liability insurance within the meaning of Section 16450 of the Vehicle Code, automobile liability insurance within the meaning of Section 16054 of that code, or any other liability insurance issued for vehicles with less than four wheels that meets the requirements of Section 16056 of that code shall also, as an incident thereto, complete and file the certificate or certificates provided for under Section 16431 of that code. The proof required by this section may be provided by the filing of a single certificate.