Finally was fixed later in the day today. Some instructions from another thread are copied below.
I deleted my entire Form 8936, but I did not clear my cache and cookies, and after re-entering my car data, it finally worked.
The fact that we had to wait so long to get this fixed is unacceptable.
“TurboTax has released an update to Form 8936. Follow these steps to insure that TurboTax is using the updated Form 8936.
