DTC P0550: Power Steering Switch Malfunction: Condition

DTC is set when vehicle speed is 37 MPH or more, coolant temperature is 140°F (60°C) or more and PCM receives power steering switch signal continuously for more than 60 seconds. Possible causes are:

• Power Steering Pressure (PSP) switch malfunction.
• Open or short circuit between PSP switch and Powertrain Control Module (PCM).
• PCM malfunction.