Does a guilty plea constitute a conclusive admission of guilt?

Here, when defendant pled guilty to count 3, he thereby admitted every element of the offense. (People v. Turner (1985) 171 Cal.App.3d 116, 126.) In other words, his guilty plea "constitute[d] an admission of every element of the offense charged and constitute[d] a conclusive admission of guilt." (Id. at p. 125.) Thus, his claim is not cognizable on appeal, since it goes directly to the question whether he was in fact guilty of the charged offense. (Pinon, supra, 96 Cal.App.3d at p. 910.)