Power Steering Pump Whine
Power steering pump whine can be mistaken for transmission whine and often changes when the steering wheel is turned.
Can I Drive?
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Most Likely Causes
- 1
Low power steering fluid
Low fluid lets the pump draw air and whine.
- 2
Air in power steering system
Aerated fluid creates foam and noise.
- 3
Failing pump bearing or vanes
Internal wear can whine even with correct fluid level.
- 4
Restricted hose or steering rack issue
Flow restriction can load the pump.
How to Diagnose It
- 1
Turn steering wheel while listening
Noise that changes with steering input points to power steering.
- 2
Check fluid level and foam
Look for low, dark, or foamy fluid.
Tool: Clean rag
- 3
Inspect hoses and leaks
Check pump, rack, and lines for wetness.
Tool: Flashlight
How to Fix It
Correct fluid level with specified fluid
Top off only with the required fluid type.
Bleed air from the system
Follow the steering bleed procedure after repair.
Replace failed pump or leaking hose
Repair the component that fails testing.
Mistakes to Avoid
- Do not confuse steering-dependent whine with transmission noise.
- Do not use ATF in a system that requires dedicated power steering fluid unless specified.
- Do not hold the steering at full lock for long periods while diagnosing noise.