DTC P0550: Power Steering Pressure Switch Circuit Malfunction: Condition
WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when vehicle speed is more than 37.4 MPH, coolant temperature is 140°F (60°C) or more and PCM receives a low Power Steering Pressure (PSP) switch signal continuously for one minute. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- PCM malfunction.
- PSP switch malfunction.
- Short circuit between PSP switch and PCM.