CA Veh Code Section 4454

(a)

Every owner, upon receipt of a registration card, shall maintain the same or a facsimile copy thereof with the vehicle for which issued.

(b)

This section does not apply when a registration card is necessarily removed from the vehicle for the purpose of application for renewal or transfer of registration, or when the vehicle is left unattended.

(c)

Any violation of this section shall be cited in accordance with the provisions of Section 40610.