P0551 Code: Power Steering Pressure Sensor/Switch Range/Performance
🟢 Low severity · drivable
Drivable, but the engine may stumble when steering at low speed until the switch is fixed.
What P0551 means
The power steering pressure switch is working electrically, but its reading is outside the expected range. The switch should only signal "under load" when you actually turn the wheel. A range or performance fault means the switch is reading wrong, which can stop the engine from raising its idle when you steer.
Symptoms
- Check engine light is on
- Engine idle drops when turning the wheel
- Engine stalls at low speed while steering
- Steering feels heavier than normal in some cases
Common causes
- most common: Faulty or worn power steering pressure switch
- common: Damaged switch wiring
- common: Low power steering fluid affecting pressure
- less common: Faulty power steering pump pressure
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check and top up the power steering fluid | Yes | $10–40 |
| Replace the power steering pressure switch | Yes | $40–150 |
| Repair switch wiring or diagnose the pump | Mechanic | $100–400 |
Frequently asked questions
Can I drive with a P0551 code?
Yes, but the engine may stumble or stall when you turn the wheel while stopped. Drive carefully until it is repaired.
What does range/performance mean for a steering switch?
It means the switch works but gives a reading the computer does not expect, often because the switch is worn or fluid is low.
How much does it cost to fix a P0551?
Topping up fluid is about $10–$40. Replacing the switch costs $40–$150, and pump or wiring work runs higher.
Related codes
P0550
P0550 Code: Power Steering Pressure Sensor/Switch Circuit Fault
P0552P0552 Code: Power Steering Pressure Sensor/Switch Circuit Low
P0553P0553 Code: Power Steering Pressure Sensor/Switch Circuit High
Related guide: How to Reset a Check Engine Light →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.