P0552Power Steering Pressure Sensor/Switch Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Hydraulic power steering has a pressure switch or sensor on the high-pressure line; when the wheel is turned at standstill, pump pressure and engine load rise sharply, so the engine module raises idle air in advance to stop the engine stalling. That makes it an input to idle control under CARB. Switches (Saab, Mitsubishi) ground a pull-up; analogue 5 V sensors (Toyota) give about 0.45 V at zero pressure. GM's and Ford's tables do not use P0550–P0554. P0552 means the signal of an analogue sensor is below range – an open 5 V supply, a signal shorted to ground or a faulty sensor, not low pressure. Toyota's 2007–08 Tundra set P0552/P0553 from a series sensor fault and replaced it with a revised part, with the warning lamp on.
- What you may notice
- Check engine light on (Toyota)
- Idle drops when steering at standstill
- Possible fluid leak at the sensor
- Likely causes
- LikelySensor faulty (Tundra 2007–08 series part)
- Possible5 V supply open or signal shorted to ground
- PossibleConnector corroded or oily (leaking sensor)
- RareEngine module 5 V reference
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.