California Code, Vehicle Code - VEH § 16503

The department shall suspend the registration of all vehicles used in the transportation of persons or property in the conduct of a business, except vehicles subject to regulation by the Public Utilities Commission, which are registered in the name of any person convicted of violating Section 16502 immediately upon receipt of a duly certified abstract of the record of the court in which the person was convicted.

The suspension shall remain in effect and no such vehicle shall be registered in the name of the person until he or she gives the department proof of his or her financial responsibility as required by Section 16500.