If i sit inside my car n lock it with the fob from inside ,then try to start it i get engine disabled .if i open with the fob still inside ,it will start ,,,,so if it thinks its locked you will get engine disabled , if that helps ;) ..
I have never heard a pssschhh on mine there is no dump valve to make that noise unless you have a split in the pipe work from turbo to inlet manifold you should not get a noise.