I would delete the W-2 and re-enter. I made a test return and entered a W-2 with a code D and $30,000 in box 12 and smart check did not complain.
If not I suggest calling customer support who can review your tax return.
Here is a TurboTax FAQ for contacting customer support.
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**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
