I am trying to locate the presure control solenoid c on a 2003 VW Passat V-6

What is your question?

This 2003 passat will not shift past 3rd gear and when you drive it at 55 to 60 mpg the tach pegs 3000 to 3600 rpm... the OBD2 code pull out the code P0798 which references the pressure control solenoid C electical.. any ideas on where this solenoid is located please someone who knows HELP!!!

What makes this problem better or worse?

It has no other issues

How long has your 2003 Volkswagen Passat had this problem?

A week?