2018 rs ls2
 

Service parking brake light is on car only has 1000 miles on it took it to dealer and they reset the code but it came back on shortly after i left dealership, what can the problem be?

I seriously doubt anyone has a manual for that. I don't think we have any dealer techs here either. Seems like the dealers always does a reset or a software update in hopes it was a fluke.

Certainly nothing is worn out unless it was put together wrong. On a car that new it could be a defective sensor or a bad crimp in a connector. Should be easy to track down with a manual and a real scan tool.