Pcm Code P040 - Open PSPS Circuit: Notes
WARNING: This page is about a different car, the 1993 Cadillac Seville and 1993 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
This code test monitors power steering pressure switch. When a load is placed on power steering, such as full lock, switch opens. PCM Code P040 sets when vehicle speed is greater than 45 MPH and pressure switch is open.