My w2 does not have a control number box D. This is not a new employer.

[skellogg6]

What do I put in its place?

[LeeM]

You can simply leave the control number box blank. The IRS doesn't care what's in Box D because its use by payroll departments is optional. 

A Control Number (Box D) is used by many payroll departments to uniquely identify a W-2 in their system. If your W-2 doesn't have one, it's no big deal – you can simply leave it blank. 

Now, if you're trying to import your W-2 and you're persistently being asked to enter something in Box D, click skip import to get past this screen and manually enter your W-2 (which should only take a few minutes anyway). 

[Hungrycat0554]

it wont let me leave box d blank!!!!

[LeonardS]

If you have not done so delete the W-2 and then reenter the W-2 manually.  This will clear any data that may be causing this problem.

@Hungrycat0554