It depends. With the EIN, you can access your 2017 W-2 if your employer's payroll provider is one of TurboTax Import Partners that offers W-2 import to TurboTax.
You will be prompted to complete the Box 1 amount from your W-2, but if you do not have access to your W-2, you may be able to enter your YTD gross income from your 2017 year-end paystub.
Please see the following TurboTax FAQs for additional information:
Another option is to obtain your W-2 from the IRS: Missing Your W-2? Here’s What to Do?