You are correct, a separate form is required to claim a second vehicle for this Colorado credit.
In order to claim the credit for more than one vehicle in TurboTax, you will need to print an additional CO Form DR 0617, complete it manually, and mail in your return. The credit amount for 2022 is $2,000 per new EV purchased in 2022 and $1,500 for one leased for at least 2 years. See CO EV Credit for more information.
In the alternative, you could e-file your return with just one of the forms, and later file an amended return by mail to add the second form.
See here for another discussion of this issue.
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