Specific credit is a $5K Innovative Motor Vehicle Credit. Absence of credit impinges on an Underpayment Penalty.
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The problem was TurboTax calculated that I was subject to an underwithholding penalty in spite of the fact that I was due a refund. I was able to solve the problem by backing up and clicking the option: "Let the state calculate the penalty," which they presumably do correctly.
The error was that a $5,000 Innovative Motor Vehicle Credit was not properly included in Line 1 of CO DR0204. So a secondary solution is to OVERRIDE Lines 1 and 3 to obviate the penalty
What would really be nice, would be for TurboTax to fix the error in EasyStep, that is to access the $5,000 credit in the calculations. I am willing to provide a sample, and to discuss the error and underlying mechanics.