PO443 on 2002 Buick Regal

The engine light is always onwith the following message "PO443-Evap emission control purge valve C fault". The car doesn't pass inspection.

Asked by for the 2002 Buick Regal
need to have diag to find problem. a scan tool will activate the purge valve and turn it off. could be anything from a bad valve to a computer. take it to a shop.