Is it possible that you already paid the estimated amount along with the original return, and Turbo Tax just isn't calculating any additional amounts?
Since Penalties and Interest are generally calculated on a Daily basis, I would recommend that you go ahead and get the Amended return filed and (1) either pay the additional amount of the interest from the 502UP along with any other additional payment (assuming you didn't already pay it with the original return) or (2) just leave the penalty and interest off, and submit any other payment due.
The State will send you a bill for the additional amounts due along (generally along with an explanation of how those amounts were calculated) as soon as they process the amended return.
In my experience, getting the amendment filed and any taxes due paid would be paramount to trying to calculate the penalties and interest.
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