You may be able to import your W-2 if your payroll provider is a TurboTax Import Partner. You will need information from last paycheck stub to import. You will need your year to date gross income from your last paycheck stub and your employer's EIN.
Other options:
Contact your payroll department to request a duplicate W-2.
Contact the IRS for help at 1-800-829-1040. The IRS can help you with trying to obtain your W-2, or
File a Form 4852 as a substitute W-2 Form along with your tax return, but you will have to mail your tax return.