Power Steering Pressure Switch. This is a discussion on Power Steering Pressure Switch within the General Discussions forums, part of the 3rd Gen : 2002 - 2008 category! Just this week I had the check engine light come on, and I checked the code and it gave me ... 09-01-2013, 07:45 PM. #1 (permalink) Just this week I had the check engine light come on, and I checked the code and it gave me P0551 power steering pressure switch performance.