Power Steering Pressure Sensor Circuit High Input
The P0553 code indicates that the Power Steering Pressure (PSP) sensor circuit is reporting a voltage signal higher than the expected range. This sensor monitors hydraulic pressure in the power steering system and sends a signal to the Engine Control Module (ECM) to adjust idle speed during steering maneuvers. A high input typically means the sensor is stuck at a high voltage, the circuit has a short to power, or the ECM is receiving an incorrect signal. This can cause the ECM to incorrectly raise idle speed, leading to drivability issues.
01. Most Common Causes
- Faulty power steering pressure sensor
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corroded or loose electrical connections
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic idle speed, especially when turning the steering wheel
- Hard steering or loss of power steering assist
- Increased steering effort at low speeds
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve the code and verify P0553 is present.
Step 2: Inspect the PSP sensor wiring and connector for damage, corrosion, or loose pins.
Step 3: Check the sensor signal voltage with a multimeter; it should be low (near 0V) when not steering and increase with steering load.
Step 4: If voltage is high (e.g., 5V) constantly, disconnect the sensor; if voltage drops, replace the sensor. If voltage remains high, repair the short to power in the wiring.
Step 5: Clear the code and test drive to confirm repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but the erratic idle and potential loss of power steering assist can make driving difficult, especially at low speeds. It is recommended to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts (sensor $20-$60) and labor (0.5-1 hour). Wiring repairs may add to the cost.