P0550 Code: Power Steering Pressure Sensor/Switch Circuit Fault
🟢 Low severity · drivable
Drivable, but the engine may stall or idle rough when you turn the wheel at low speed; fix it soon.
What P0550 means
There is an electrical problem in the circuit for the power steering pressure switch or sensor. This switch tells the engine computer when the power steering is under load, so the computer can raise the idle speed. If the switch or its circuit fails, the engine may not get the idle boost and can stall when turning the wheel at a stop.
Symptoms
- Check engine light is on
- Engine stalls when turning the wheel at low speed
- Rough idle while steering
- Idle speed drops when the steering is turned
Common causes
- most common: Faulty power steering pressure switch
- common: Damaged or corroded switch wiring
- common: Loose or corroded connector
- less common: Power steering fluid leak affecting pressure
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the power steering pressure switch | Yes | $40–150 |
| Clean and tighten the switch connector | Yes | $0–50 |
| Repair damaged switch wiring or fix a fluid leak | Mechanic | $100–300 |
Frequently asked questions
Can I drive with a P0550 code?
Yes, but the engine may stall when you turn the wheel while stopped or at low speed, so be careful in parking lots.
What does the power steering pressure switch do?
It tells the computer when power steering is under load so the engine can raise its idle and avoid stalling.
How much does it cost to fix a P0550?
A new switch costs about $40–$150. Wiring repairs or leak fixes run $100–$300.
Related codes
P0551
P0551 Code: Power Steering Pressure Sensor/Switch Range/Performance
P0552P0552 Code: Power Steering Pressure Sensor/Switch Circuit Low
P0553P0553 Code: Power Steering Pressure Sensor/Switch Circuit High
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.