That TPS Technical Service Bulletin I Referenced Earlier Described A Problem Found In Vehicles In Hot Climates, Especially. Now You Have A TPS DTC (Code).
Since you’re trying to DIY and keep costs at a minimum, I’d bop over to a local Kia dealer and befriend the Service Manager/Service Director (or if need be, the Parts Department guys) and have them pull that bulletin for you. Discuss this issue with them and see what they think. They might have some experience with this that they will remember.
CSA