In what circumstances can a defendant withdraw a guilty plea?

We recognize that under certain circumstances a defendant may seek to withdraw a guilty plea. (People v. Quesada (1991) 230 Cal.App.3d 525, 531, fn. 2 [" 'a motion to set aside a judgment of conviction and for permission to withdraw a plea of guilty may ordinarily be considered as a petition for writ of error coram nobis' "]; 1018 [upon a showing of good cause, a defendant may withdraw his guilty plea before the entry of judgment].) Nothing in the record before us, however, indicates defendant ever sought to

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