TurboTax cannot "pull up" your W-2. You can call the IRS and they will contact the employer for you. See the following link on the IRS web site.
Topic no. 154, Form W-2 and Form 1099-R (what to do if incorrect or not received)
If you end up needing to file Form 4852, TurboTax will prepare it for you and include it in your tax return. You do not have to use the Form 4852 that the IRS sends you.
