Well, as I said, on many cars an illuminated CEL will also trigger the VSC warning light. Have the repairs done that are indicated by the stored trouble codes (in this case, possibly replacing the Cat) and the VSC light should go off.
Incidentally, if your state has an emissions test as part of the state inspection, you will not be able to pass your state inspection with a bad catalytic converter or any other situation that triggers the CEL.