I have a zero in box 1 and 3 with a number in 12a marked as II with a number. I entered all the info and Turbo Tax says I can't efile. Should I just not enter the W2

It depends.  Do you plan to claim the EITC or ACTC?  If so, you will need to enter it using the instructions below.

 

Since you have nothing on your form other than something in box 12, you will need to delete the W-2 where you entered it and follow these steps which will allow you to use the IHSS payments to claim the EITC or ACTC

1. Select income
2. Miscellaneous Income which is under Less Common Income
3. Other Income Not already reported on a Form W-2 or Form 1099
4. Select Yes to did you receive any other wages
5. Continue to the box that asks for your Medicaid Waiver payments
6. You will be asked about using this income for the Earned Income Credit
7. After you do this, you will need to visit the credits and deduction section to answer the Earned Income Credit questions.
8. Continue through to file your return

This should allow you to e-file

 

If you do not plan to claim either credit, then no.  You do not need to enter the W2 at all, you can just delete it.