California Code, Code of Civil Procedure - CCP § 1019.5

(a) When a motion is granted or denied, unless the court otherwise orders, notice of the court's decision or order shall be given by the prevailing party to all other parties or their attorneys, in the manner provided in this chapter, unless notice is waived by all parties in open court and is entered in the minutes.

(b) When a motion is granted or denied on the court's own motion, notice of the court's order shall be given by the court in the manner provided in this chapter, unless notice is waived by all parties in open court and is entered in the minutes.