What is a power steering pressure switch?
A power steering pressure switch—sometimes called a power steering pressure sensor—is an electrical component found in some power steering systems. It is typically mounted near the power steering pump or rack and pinion and monitors the system pressure. The switch sends information about the power steering system pressure to the engine control module (ECU).
As you turn the steering wheel, the power steering pump puts stress on the engine. At low speeds, this can cause the engine to stall. The ECU uses the switch’s information to make adjustments to the engine power output, preventing the engine from stalling while you turn the wheel at low speeds.
When should I replace the power steering pressure switch on my car?
There is no fixed replacement interval for the power steering pressure switch. Because of that, you’ll only need to replace yours if it fails. The top signs of power steering pressure switch failure are:
Engine performance problems: The primary sign of a bad power steering pressure switch is poor engine performance. You may notice the engine slows down, stalls, or speeds up and slows down erratically.
Check engine light: The check engine light will likely appear if you have a bad power steering pressure switch. But this light may appear for many reasons. And you’ll need an onboard diagnostics (OBD) scan tool to identify the trouble code.
Keep in mind: These issues can indicate other vehicle problems, like fuel or air intake system malfunctions. For an accurate diagnosis, you’ll need to visit a certified mechanic for an inspection.
How often should I replace my power steering pressure switch?
The power steering pressure switch doesn’t have a fixed replacement interval. But, like most electrical components, it can fail over time. You’ll need to replace yours when it shows signs of failure, which can include a check engine light, engine sluggishness, and difficulty steering.
Can I replace my power steering pressure switch myself?
A power steering pressure switch replacement can be a solid DIY project if you have the right tools and know-how. It generally requires mid-level automotive experience, and experienced hobbyists should be able to complete the service with ease. That said, novices may struggle—and if you’re uncomfortable performing the repair yourself, you should contact a professional mechanic.