can't find this sensor

I own a 2000 trailblazer and my evaporation emission system pressure sensor/switch high input is out.thats what my code reader says and i have no idea where thats located /I am hoping that will fix my 4 wheel drive any help would be greatly apreciated thanks, Dave

What's the actual code #

the code is P0454 any help would be great thanks, Dave

The pressure sensor is on the top of the fuel tank module. You might be able to get to it without lowering the tank, but I don't know for sure. Check the electrical connector to make sure it's tight.
 


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