Power Steering Pressure Sensor Circuit High Input
The P0553 code indicates that the Power Steering Pressure (PSP) sensor circuit is sending a voltage signal higher than the expected range to the Powertrain Control Module (PCM). This sensor monitors hydraulic pressure in the power steering system to adjust idle speed and other parameters. A high input typically means a short to voltage, faulty sensor, or wiring issue.
1. Most Common Causes
- Faulty or internally damaged power steering pressure (PSP) sensor
- Short circuit in the sensor wiring to reference voltage (5V) or battery voltage (B+)
- Excessive resistance in the sensor ground circuit (poor ground)
- Corroded, oxidized, or damaged pins in the sensor connector
- Internal ECM/PCM failure (less common)
2. Symptoms You Will Notice
- Check Engine Light on
- Hard steering or loss of power assist
- Erratic idle speed when turning
- Increased steering effort at low speeds
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the PSP sensor and wiring for damage or corrosion.
Step 3: Test sensor voltage with a multimeter; should be 0.5-4.5V depending on pressure.
Step 4: Check for shorts to power or ground in the circuit.
Step 5: Replace sensor if readings are out of spec and wiring is intact.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as it may cause loss of power steering assist, making the vehicle difficult to steer, especially at low speeds.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the sensor cost and accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.