The GTP does not have one it has Magnasteer which is all integrated in the steering rack & pinion which is controlled by the EBCM.
When engine is turned off there won't be any pressure.
You need a new psp power sterring pressure switch
Standard GM power sterring fluid available at GM dealers.
Power steering pressure sensor circuit performancePower steering pressure sensor circuit performance
Power Sterring.
The power steering pressure sensor is located on the front of the power steering pump. It is circular and has one wire going to it.
good luck with this it took me like 5 hours to figure it out the sensor is right next to the water pump on the right side underneith the power sterring pump u have to take the serpentine belt off and get a pulley puller for the power sterring pulley when u get that off u take the bracket off and u can get to the sensor a lot easier there will be wire hooked up to it so u should see it if u don't take the power sterring oulley off u will be struggling for hours like me but good luck
It is located on the pressure line.
yes
Behinf the power steering pump
under neath the power steering pump
I assume you must have a diesel if you want to know where the vacumme pump is. In that case it is in front of your power sterring pump. Your power sterring pump bolts to it.