The code C and D report the taxable amount of life insurance and your 401-K contribution. Both of those amounts would be included in your box 1 entry so your entry in box 12 would have no affect on your federal return and it would not likely affect your state return either. One of the W-2 copies should say "File with your federal return" and one should say "file with your state or local return" or something similar to that. Use those copies for the numbers you put in TurboTax. Otherwise, you may have to ask your employer which amounts are intended for your tax filing.
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