The data type for at least one field is too small for the data you're trying to import. In your code, verify the data type (and length) with the data you're trying to import before you attempt to insert it.
I've done that. All columns are varchar(50), date, or decimal(18,2) and I've tested the command in sql management studio and line 1 inserts, but not line 2. I've included the actual data being passed (in the form of the print output) in my OP.
...why aren't you just using bcp to import your csv file?
Because this was SUPPOSED to be a quick script to get going. I have an existing script somewhere else on another server. Theoretically, I should just be able to copy/paste, change a few variables, and done. But no.