Cal. Ins. Code § 665

When a policy of automobile liability insurance is canceled, other than for nonpayment of premium, or in the event of failure to renew a policy of automobile liability insurance to which Section 663 applies, the insurer shall notify the named insured of his possible eligibility for automobile liability insurance through the automobile liability assigned risk plan. Such notice shall accompany or be included in the notice of cancellation or the notice of intent not to renew.