P0550 Code: Power Steering Pressure Sensor/Switch Circuit

Most vehicles with a hydraulic power steering system have a power steering pressure sensor. The powertrain control module (PCM) will register a P0550 code on a scan tool if it detects a general malfunction within the power steering pressure sensor’s circuit.

What Does the P0550 Code Mean?

Diagnostic trouble code P0550 stands for “Power Steering Pressure Sensor/Switch Circuit.”

All modern vehicles are equipped with a power steering system that makes it easier for the driver to turn the steering wheel. Some systems use an engine-driven pump and hydraulic fluid to provide steering assist. When such a setup is used, there’s usually a power steering pressure sensor that keeps the PCM informed of system pressure. The PCM can then increase engine idle speed when the power steering system pressure gets high enough that the vehicle might stall from the excessive load. If the PCM detects one or multiple conditions outside the specified range of the power steering pressure sensor circuit, the vehicle’s computer will log a P0550 code on a scan tool.

Note: The definition of code P0550 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0550 Code?

• Faulty power steering pressure sensor
• Circuit problems, such as a damaged wire or poor connection
• Power steering fluid leak
• An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P0550 Code?

• Illuminated check engine light
• Stalling
• Incorrect idle speed

How to Diagnose the P0550 Code

DTC P0550 is a generic powertrain code that can be stored in vehicles with an OBD-II system. However, the diagnostic steps may vary depending on your vehicle’s make and model. What might work to resolve a P0550 code in a Nissan might not work for a Honda. If you’re not familiar with the diagnostic process, it’s best to leave the job to an expert to ensure that all steps and protocols are followed.

Here’s an instructional video that illustrates what a standard diagnostic process might look like. Make sure to read your vehicle’s repair manual before attempting to clear this code.

How to Fix the P0550 Code

There’s no magic bullet for troubleshooting a P0550 code. You’ll have to identify the underlying problems of this code to figure out the right solution. Good thing there are a lot of credible resources online to help you get started. We recommend getting Chilton repair manuals so you can familiarize yourself with your vehicle’s parts and subscribing to ALLDATA for a more detailed look at your vehicle’s potential problems.

Where to Car Fluids and Replacement Parts to Clear Code P0550

A triggered P0550 code could lead to head-scratching issues like stalling. Fixing it can require anything from refilling your vehicle’s power steering fluid to replacing the power steering pressure sensor. Thankfully, CarParts.com has you covered no matter what you need.

We have a great selection of car fluids and replacement parts from the most reputable aftermarket brands today. All our products also come with a low-price and lifetime replacement guarantee to help you get the best value for your money. Order today, and we’ll deliver your package in as fast as two business days.

If you have any questions, don’t hesitate to dial our toll-free hotline. Our round-the-clock customer service team is always ready to assist you.

Shop now at CarParts.com to resolve this trouble code in no time!