Power Steering Pressure Sensor/Switch Circuit Low Input
What does P0552 mean?
The P0552 code means the vehicle's onboard diagnostic system has detected: Power Steering Pressure Sensor/Switch Circuit Low Input. This is a low severity code.
Common Symptoms
- Engine stalls when steering wheel is turned
- Idle RPM drops during steering
- No idle speed compensation during parking
- Power steering operation feels normal but idle is affected
- Check engine light on
Probable Causes (Ranked by Likelihood)
- PSP sensor signal wire shorted to ground Very High
- Faulty PSP sensor (internal short) High
- Corroded PSP sensor connector or pins Moderate
- Damaged wiring in PSP sensor circuit Moderate
- Low or missing 5V reference voltage to sensor Low
Step-by-Step Diagnostic Procedure
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Disconnect PSP sensor and check if signal voltage rises to 5V reference -- if so, sensor is shorted internally
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Inspect PSP sensor connector for power steering fluid contamination causing a short
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Measure signal wire resistance to ground with sensor disconnected -- should be infinite (open)
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Verify 5V reference voltage and ground at sensor connector with key on engine off
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Replace PSP sensor if wiring tests confirm good circuit integrity
Frequently Asked Questions
Can I drive with code P0552?
Yes, you can drive, but the engine may stall when you turn the steering wheel at idle. The PCM reads a constant low pressure signal, so it does not compensate idle speed for steering load. Be cautious during parking maneuvers.
Can power steering fluid leak onto the sensor and cause this?
Yes. Power steering fluid leaking onto the sensor connector is a common cause. The fluid can cause short circuits between the connector pins, resulting in a low voltage reading. Clean the connector thoroughly and fix any fluid leaks.
Where is the PSP sensor located?
The power steering pressure sensor is typically located on the high-pressure line coming from the power steering pump, often near the steering rack or on the pump itself. It is a small sensor with a 2 or 3-wire electrical connector.