A whine that appears or rises in pitch when you turn the steering wheel most often means the hydraulic power steering pump is working with too little fluid, aerated fluid or worn fluid — a cheap fix if caught early, but a ruined pump if ignored. Check the fluid level first using our how to check power steering fluid level guide. This is different from a whine that follows engine speed (see whining noise when accelerating) and from a squeal, which usually points to a belt.
Why the Pump Whines
A hydraulic power steering pump pushes fluid through the rack to assist your steering. When the fluid level is low, air gets drawn in, and the pump whines because it is working against foamy, aerated fluid. The noise usually rises when you turn the wheel, because turning raises the demand on the pump, and is loudest at full lock. Old, dark fluid or a failing pump bearing can produce the same sound.
Many newer cars use electric power steering, which has no fluid and no pump belt. If your car is one of them, a whine is more likely to come from the steering motor or column, and the fluid advice here doesn’t apply — check the owner’s manual.
Holding the steering against the stop for more than a few seconds forces the pump to work at maximum pressure and heats the fluid, which accelerates wear. Turn to the stop and release.
Common Causes, Most Likely First
- Low fluid level, usually from a leak — look for drips under the car. The red or amber colour helps identify it: red fluid leaking under car.
- Air in the system after a leak or repair, giving foamy fluid.
- Old, dirty or contaminated fluid that no longer lubricates well.
- A worn power steering pump.
- A leaking or restricted hose, or a failing steering rack seal.
- A loose or worn drive belt — usually a squeal rather than a whine. See serpentine belt inspection and squealing noise when accelerating.
How to Check
- Check the fluid level and condition in the reservoir with the engine off — see how to check power steering fluid level. Foamy, dark or burnt-smelling fluid is a warning.
- Top up with the correct fluid (check the manual) if it is low.
- Look for leaks at the hoses, pump, and rack, and under the car.
- Listen for the pattern: does it change with steering input or with engine speed?
- Compare with other steering noises — see squeaking noise when turning the steering wheel and grinding noise when turning at low speed.
Let the engine and exhaust cool before touching hoses, sensors or connectors, and never open a hot cooling system. Keep hands, hair and loose clothing away from belts and fans, which can start without warning.
Possible Fixes
| Cause | Fix | Typical cost |
|---|---|---|
| Low fluid | Top up with the correct fluid | $5 – $25 |
| Aerated or old fluid | Bleed and flush the system | $100 – $250 |
| Leaking hose | Replace the hose | $150 – $500 |
| Worn pump | Replace the pump | $300 – $900 |
| Leaking steering rack | Replace or reseal the rack | $800 – $2,000 |
Can I Keep Driving With This?
For a short time, if you top the fluid up and the noise goes away. A whine means the pump is struggling, and running it dry can destroy it and leave you with very heavy steering — see our steering wheel is hard to turn guide. If the steering suddenly becomes heavy, pull over safely.
When to See a Mechanic
If the fluid keeps dropping, the noise returns after a top-up, or the steering is heavy. Tell the shop when the noise occurs. More in our steering and suspension section.
Frequently Asked Questions
Why does my power steering whine when I turn the wheel?
Usually the pump is working with low or aerated fluid, or the fluid is old or the pump is wearing out.
Can I just top up the power steering fluid?
If the level is low, yes, with the correct fluid. If it keeps dropping, there is a leak to find.
Is a whine the same as a squeal?
No. A whine is a pump or fluid noise that varies with steering input. A squeal usually points to a slipping drive belt.
Does an electric power steering car whine for the same reason?
Not usually. Electric systems have no fluid or pump belt, so a whine would come from the motor or column.
How much does it cost to fix?
From about $5 for fluid to $300–$900 for a new pump, and more for a steering rack.
