Cal. R. 3.1308
A trial court that offers a tentative ruling procedure in civil law and motion matters must follow one of the following procedures:
The court must make its tentative ruling available by a method designated by the court, by no later than 3:00 p.m. the court day before the scheduled hearing. If the court desires oral argument, the tentative ruling must so direct. The tentative ruling may also note any issues on which the court wishes the parties to provide further argument. If the court has not directed argument, oral argument must be permitted only if a party notifies all other parties and the court by 4:00 p.m. on the court day before the hearing of the party's intention to appear. A party must notify all other parties by telephone or in person. The court must accept notice by telephone and, at its discretion, may also designate alternative methods by which a party may notify the court of the party's intention to appear. The tentative ruling will become the ruling of the court if the court has not directed oral argument by its tentative ruling and notice of intent to appear has not been given.
The court must make its tentative ruling available by a method designated by the court, by a specified time before the hearing. The tentative ruling may note any issues on which the court wishes the parties to provide further argument at the hearing. This procedure must not require the parties to give notice of intent to appear, and the tentative ruling will not automatically become the ruling of the court if such notice is not given. The tentative ruling, or such other ruling as the court may render, will not become the final ruling of the court until the hearing.
Other than following one of the tentative ruling procedures authorized in (a), courts must not issue tentative rulings except:
A court that follows one of the procedures described in (a) must so state in its local rules. The local rule must specify the method for obtaining the tentative rulings and the time by which the rulings will be available.
If a court or a branch of a court adopts a tentative ruling procedure, that procedure must be used by all judges in the court or branch who issue tentative rulings.
This rule does not require any judge to issue tentative rulings.
Cal. R. Ct. 3.1308