What Causes the Noise When Turning the Steering Wheel to Full Lock?
4 Answers
Noise when turning the steering wheel to full lock occurs because the power steering pump is damaged, preventing the power steering fluid from circulating or causing obstruction. Solutions: 1. Try to avoid holding the steering wheel at full lock for extended periods; 2. If full lock is necessary, keep the duration as short as possible to avoid damaging the power steering pump. The power steering pump is a component that enhances and stabilizes vehicle performance, primarily assisting the driver in adjusting the vehicle's direction. When the car is turning, the torque sensor detects the steering wheel's torque and intended direction of rotation. These signals are sent to the electronic control unit via the data bus. Based on the transmitted torque, intended direction, and other data signals, the electronic control unit issues commands to the motor controller. The motor then outputs the required amount of rotational torque, thereby providing power steering assistance.
I've also experienced the clunking sound when turning the steering wheel to full lock before. After consulting an experienced mechanic, I learned there are several main causes. The most common is worn steering ball joints - these components at the steering knuckle endure daily exposure and easily become loose, making a "click" sound at full lock. Another issue could be the power steering pump, especially in older hydraulic-assisted vehicles where full lock causes oil pressure to surge, making the belt squeal if it slips. Additionally, gear wear in the steering gear itself or loose positioning pins can create abnormal noises at extreme angles. From my own experience, loose chassis bolts can also cause this - I once heard metal clanging sounds on a bumpy road. Never ignore such noises - it's safest to get the car lifted for inspection at a repair shop early. Prolonged full-lock steering significantly reduces steering gear lifespan.
Hearing noises when turning the steering wheel to full lock can indeed be unsettling, but there's no need to panic. Focus on checking three key areas: First, inspect the tie rod end ball joint – if its plastic dust cover cracks and lets in moisture, it'll cause a squeaking sound (repair costs around 100 yuan). Next, check the power steering fluid; hydraulic systems make a "hissing" noise when low on fluid during full-lock turns, which topping up can resolve. An often-overlooked culprit is brake pads – full-lock steering alters the position between brake discs and suspension, amplifying caliper friction noise. I once experienced this while parking in my neighborhood: a sharp scraping sound at full lock turned out to be the fender rubbing the tire. As preventive maintenance, avoid maximum steering lock – leave about 5 degrees of margin to protect the power steering system. If you hear metallic clunking, pull over immediately for inspection.
Steering wheel noise is most likely due to worn chassis components. The most common culprit is a loose ball joint in the steering knuckle – this part bears the entire weight of the front wheel, and when worn, excessive play during full lock causes a "clunking" sound. Another possibility is the CV joint on the driveshaft; if the outer boot leaks grease and rust sets in, it'll produce a clicking noise, especially noticeable in front-wheel-drive vehicles. For electric power steering systems, the issue might stem from loose steering column bolts or problems with the motor gears. Last time I helped my cousin diagnose a noise, it surprisingly originated from the steering wheel clock spring (airbag spiral cable) – caused by aged and cracked plastic components. I recommend first checking tire pressure yourself, as insufficient pressure can cause tire rubbing against the wheel arch during full lock steering. If that's ruled out, have it professionally inspected at a shop. Safety first – don't delay repairs too long.
