In TurboTax, you do not need to enter contributions you made to your 401(k) plan at work.
These contributions are already reported on your form W-2 in box 12 with code D and have already been excluded from taxation in the amount reported in Box 1 of your W-2. Therefore, you'll not see a decrease in AGI as the reduction is already made in box 1 of your form W-2.
Please check that your W-2 has the amount of your 401(k) contributions in box 12 code D and enter your W-2 in TurboTax as received.
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