If you haven't already, you could check to see whether the W-2 is importable in TurboTax.
In addition to contacting the IRS by phone or at a Taxpayer Assistance Center as suggested by @Bsch4477, you can get a wage and income transcript, containing the Federal tax information your employer reported to the Social Security Administration (SSA), by visiting their Get Your Tax Record page. Refer to Transcript Types and Ways to Order Them and About Tax Transcripts for more information.
You can also use Form 4506-T, Request for Transcript of Tax Return. Check the box for Form W-2, specify which tax year(s) you need, and mail or fax the completed form. Most requests will be processed within 10 business days from the IRS received date.
@360bh2016
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