Symptoms
- Whining noise when turning the steering wheel, especially at full lock
- Noise reduces or stops when the wheel is centered
- Steering may feel slightly harder or looser than normal
- Could be paired with a whining sound even without turning if the pump is failing generally
Likely causes
- CommonLow power steering fluid levelInsufficient fluid causes the pump to work harder and can introduce air, both of which cause whining.
- CommonAir in the power steering systemAir bubbles disrupt smooth fluid flow and often whine, especially at full steering lock.
- PossibleFailing power steering pumpInternal wear can cause a pump to whine increasingly, even with proper fluid level.
- PossiblePower steering fluid leak feeding the low-fluid whineA leak causes the fluid level to drop over time, leading to recurring whining.
- PossibleBelt slipping under the steering load (see belt-related noise if severe)A worn belt can contribute to or be mistaken for a pump whine.
What to do
- Check the power steering fluid reservoir level and top off with the correct fluid type if low.
- Look underneath the car and around the pump/reservoir for any signs of fluid leakage.
- After topping off, turn the wheel fully in both directions several times (safely, in park) to help work out any trapped air.
- If the whine continues after confirming proper fluid level and no leaks, the power steering pump itself may be wearing out.
- Check the serpentine belt condition, since a worn belt can also contribute to a steering-related whine.
- Have a mechanic inspect and, if needed, bleed the power steering system properly if air intrusion is suspected.
- Address a confirmed fluid leak promptly, since running the system low on fluid can cause pump damage over time.
- Replace the power steering pump if a mechanic confirms internal wear rather than fluid or air as the cause.
Tools and parts
- Flashlight
- Power steering fluid
- Funnel
Power steering fluidSearch: “power steering fluid for [year make model]”
Power steering pumpSearch: “power steering pump for [year make model]”
When to call a pro
If topping off fluid and bleeding the system doesn't stop the whine, have a mechanic check for a leak or a failing power steering pump.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.