California Code, Probate Code - PROB § 2450

(a) Unless this article specifically provides a proceeding to obtain court authorization or requires court authorization, the powers and duties set forth in this article may be exercised or performed by the guardian or conservator without court authorization, instruction, approval, or confirmation.  Nothing in this subdivision precludes the guardian or conservator from seeking court authorization, instructions, approval, or confirmation pursuant to Section 2403.

(b) Upon petition of the ward or conservatee, a creditor, or any other interested person, or upon the court's own motion, the court may limit the authority of the guardian or conservator under subdivision (a) as to a particular power or duty or as to particular powers or duties.  Notice of the hearing on a petition under this subdivision shall be given for the period and in the manner provided in Chapter 3 (commencing with Section 1460) of Part 1.