Symptoms
- Whining noise increases when turning, especially near full lock
- Noise fades when going straight
- Noise gets worse as the car warms up or over time
Likely causes
- CommonLow power steering fluidLow fluid lets air into the system, causing a whining or groaning sound under load.
- CommonWorn power steering pumpInternal wear in the pump creates noise as it works harder to build pressure.
- PossibleAir trapped in the system after a fluid top-off or repairAir bubbles cause noise until they're bled out.
What to do
- Check the power steering fluid level and top it off if low, using the correct fluid type for your car.
- Inspect for any visible fluid leaks around the pump, hoses, and steering rack.
- If fluid was just added, turn the wheel lock to lock a few times with the engine running (car in park) to help bleed air.
- If noise continues with correct fluid level and no leaks, the pump itself may be wearing out.
- Have a mechanic test pump pressure and inspect for leaks if the noise persists.
Tools and parts
- Power steering fluid
Power steering fluidSearch: “power steering fluid for [your car model]”
Power steering pumpSearch: “power steering pump for [your car model]”
When to call a pro
If fluid is full and there's no visible leak, have a shop test the pump directly, since a whine that persists usually means internal pump wear.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.