Power Steering Pressure Sensor/Switch Circuit High Input
What does P0553 mean?
The P0553 code means the vehicle's onboard diagnostic system has detected: Power Steering Pressure Sensor/Switch Circuit High Input. This is a low severity code.
Common Symptoms
- Engine idle too high when not steering
- Idle speed remains elevated after turning wheel
- Unnecessary idle speed increase
- Higher than normal fuel consumption at idle
- Check engine light on
Probable Causes (Ranked by Likelihood)
- PSP sensor signal wire open or shorted to voltage Very High
- Faulty PSP sensor (stuck high) High
- Disconnected PSP sensor connector High
- Corroded or damaged wiring causing high resistance Moderate
- Power steering system over-pressure condition Low
Step-by-Step Diagnostic Procedure
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Check PSP sensor connector -- reconnect if loose or disconnected
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Measure sensor output voltage -- should be low (0.5-1.5V) with wheel straight and increase when turning
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If voltage is stuck high (near 5V), disconnect sensor and check signal wire for shorts to the 5V reference
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Inspect wiring for damage that could cause the signal wire to contact the reference wire
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Replace PSP sensor if wiring is intact and sensor output remains stuck high
Frequently Asked Questions
Can I drive with code P0553?
Yes, driving is safe. The PCM reads a constant high pressure signal and may keep idle speed elevated as if you were constantly turning the steering wheel. This wastes some fuel but is not a safety concern.
Why is my idle speed higher than normal with this code?
The PCM interprets the high PSP signal as constant steering load, so it raises idle speed to prevent stalling. Since there is no actual steering load most of the time, the idle sits higher than the normal 650-750 RPM.
Could a disconnected sensor cause this code?
Yes. When the PSP sensor is disconnected, the PCM reads the 5V reference voltage as a maximum pressure signal (circuit high). Always check that the sensor connector is securely plugged in before replacing any parts.