When you are issued a Corrected W-2, enter the information from the Corrected form in TurboTax. When you are finished entering the information, a screen appears, "Let's check for uncommon situations". Check the box, "W-2 was corrected by my employer (Form W-2c)" so that the IRS will match the information on your tax return with the correct form.
See this article for more information on Forms W-2.
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