Your W-2 does not get Efiled. The info from your W-2 is entered into your tax return (Form 1040), either manually by you, or by importing it through your employer.
So what was reported on the Form 1040 that you Efiled? If you were missing a W-2 when you filed, you can Amend your Return after you have received your Refund to add it.
Here's more info on How to Enter or Import your W-2.
@robinstamper