A cause is deemed submitted in a trial court when either of the following first occurs:
The court may vacate submission only by issuing an order served on the parties stating reasons constituting good cause and providing for resubmission.
A submitted cause is pending and undetermined unless the court has announced its tentative decision or the cause is terminated. The time required to finalize a tentative decision is not time in which the cause is pending and undetermined. For purposes of this rule only, a motion that has the effect of vacating, reconsidering, or rehearing the cause will be considered a separate and new cause and will be deemed submitted as provided in (a).
Cal. R. Ct. 2.900