Utah Code Title 77. Utah Code of Criminal Procedure § 77-13-6. Withdrawal of plea

(2)(a) A plea of guilty or no contest may be withdrawn only upon leave of the court and a showing that it was not knowingly and voluntarily made.

(b) A request to withdraw a plea of guilty or no contest, except for a plea held in abeyance, shall be made by motion before sentence is announced. Sentence may not be announced unless the motion is denied. For a plea held in abeyance, a motion to withdraw the plea shall be made within 30 days of pleading guilty or no contest.

(c) Any challenge to a guilty plea not made within the time period specified in Subsection (2)(b) shall be pursued under Title 78B, Chapter 9, Postconviction Remedies Act, and Rule 65C, Utah Rules of Civil Procedure.