Cal. Public Utilities Code § 5434

(a) Nothing in this section shall be construed to require a private passenger automobile insurance policy to provide primary or excess coverage during the period of time from the moment a participating driver in a transportation network company logs on to the transportation network company’s online-enabled application or platform until the driver logs off the online-enabled application or platform or the passenger exits the vehicle, whichever is later. (b) During the period of time from the moment a participating driver in a transportation network company logs on to the transportation network company’s online-enabled application or platform until the driver logs off the online-enabled application or platform or the passenger exits the vehicle, whichever is later, all of the following shall apply: (1) The participating driver’s or the vehicle owner’s personal automobile insurance policy shall not provide any coverage to the participating driver, vehicle owner, or any third party, unless the policy expressly provides for that coverage during the period of time to which this subdivision is applicable, with or without a separate charge, or the policy contains an amendment or endorsement to provide that coverage, for which a separately stated premium is charged. (2) The participating driver’s or the vehicle owner’s personal automobile insurance policy shall not have the duty to defend or indemnify for the driver’s activities in connection with the transportation network company, unless the policy expressly provides otherwise for the period of time to which this subdivision is applicable, with or without a separate charge, or the policy contains an amendment or endorsement to provide that coverage, for which a separately stated premium is charged. (c) Notwithstanding any other law, a personal automobile insurer may, at its discretion, offer an automobile liability insurance policy, or an amendment or endorsement to an existing policy, that covers a private passenger vehicle, station wagon type vehicle, sport utility vehicle, or similar type of vehicle with a passenger capacity of eight persons or less, including the driver, while used in connection with a transportation network company’s online-enabled application or platform only if the policy expressly provides for the coverage during the time period specified in subdivision (b), with or without a separate charge, or the policy contains an amendment or an endorsement to provide that coverage, for which a separately stated premium may be charged. (d) This section shall become operative on July 1, 2015.