Symptoms
- Loud, consistent whining or groaning noise from the engine area, especially at idle
- Noise present even when not turning the steering wheel
- Gets louder over time
Likely causes
- CommonWorn power steering pumpInternal wear causes cavitation and noise as the pump struggles to maintain pressure.
- CommonLow or contaminated power steering fluidOld or low fluid can cause pump noise even before real internal wear sets in.
- PossibleFailing pump pulley or belt tensionerNoise from a nearby pulley or tensioner can be mistaken for the pump itself.
What to do
- Check and top off power steering fluid, using the correct type for your vehicle.
- Inspect the fluid's color and smell; dark or burnt-smelling fluid suggests it's overdue for a flush.
- Listen closely to identify if the noise is specifically from the pump versus a nearby belt or pulley.
- Have a mechanic test pump pressure to determine if it's failing internally.
- Replace the pump if confirmed worn, and flush the system with fresh fluid at the same time.
Tools and parts
- Power steering fluid
Power steering pumpSearch: “power steering pump for [your car model]”
Power steering fluidSearch: “power steering fluid for [your car model]”
When to call a pro
A mechanic can pressure test the pump to confirm it's failing before replacing it, since fluid issues sometimes mimic pump noise.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.