What causes the buzzing sound from the power steering pump?
3 Answers
The buzzing sound from the power steering pump is caused by internal friction due to insufficient oil. Check the fluid level in the reservoir; if it is below the MIN mark, you need to add power steering fluid until the level reaches MAX. It is important to note that power steering fluid contains carcinogenic substances. If it comes into contact with your skin, wash it off immediately with clean water. Additionally, the fluid is corrosive, so if it splashes onto car paint or rubber components, clean it promptly. Symptoms of low power steering fluid include difficulty in turning the steering wheel. The purpose of power steering fluid is to make the steering wheel lighter for the driver during turns. A lack of fluid will inevitably increase the driver's effort required to steer.
This buzzing issue is something I've encountered more than once, primarily caused by the power steering pump complaining about insufficient oil or air ingress. Considering the steering system relies entirely on the hydraulic pump's operation, if the oil level is too low or the fluid has aged and become dirty, it can lead to cavitation and produce a buzzing sound. Additionally, a loose belt or wear and tear on the pump itself are common culprits. Remember to regularly check the power steering fluid reservoir's level to ensure it's between the markers, and also inspect the oil's color to ensure it's clear and not murky. If the belt is loose, it needs to be tightened; otherwise, the noise will gradually worsen, affecting steering performance. For safety's sake, don't delay—take the car to a professional repair shop for a check-up. They can test the pump pressure and system sealing.
Last year, my car also made a buzzing noise, sounding like a small insect had gotten into the engine. The reason was actually quite simple—it was mostly due to insufficient power steering fluid or air bubbles mixed in, causing the pump to work hard and make noise. I also checked if the belt had any cracks or was loose. If it's aged, it should be replaced; otherwise, it's dangerous as you might suddenly lose power steering while driving. Make it a habit to pop the hood every month to check the fluid level, ensuring it's clean and the right type is used. Low-quality oils, for example, can easily clog the system and make even more noise. I suggest dealing with it promptly—don't wait for a minor issue to turn into a major repair, wasting money and taking risks.
