This is a copy / paste from a search on the web...
* P0443- Evaporative Emission Control System Purge Control Valve Circuit Malfunction
* Generic OBD II codes are written in a standardized format. The first letter indicates the vehicle function: Body, Chassis or Powertrain. Code P0443 begins with the letter “Pâ€, which indicates a powertrain code. The next character tells us whether it is a generic or manufacturer specific code. “0†is generic, so P0443 is a generic code. The next three characters tell us more about the problem area. In this case a “4†indicates an auxiliary emission control code. The last two characters tell us that the code refers to “EVAP system – Purge valve circuit malfunction.â€
* P0443 indicates an electrical problem in the charcoal cannister purge
valve. Since it's in a rather hostile environment, check the connector first to be sure the contacts are bright and shiney and that the connector is undamaged and pushed all the way in - should be that tiny little 'click' as the lock tab engages. If there is any doubt at all, make sure all is clean and tight,
clear codes and see if it returns.... if so, there's about an 80% chance
that it's the Evap Purge solenoid.