Why does my car whine when accelerating?
A whining noise during acceleration can come from several places. A high-pitched whine that increases with engine speed points to the alternator, power steering pump, or a worn auxiliary belt pulley. A whine from the gearbox that changes with speed rather than engine revs suggests gearbox or differential bearing wear. Power steering whine when turning is usually low fluid or a failing pump.
Likely causes
Power steering pump whine
Whine when turning or on full lock — check power steering fluid level first
Alternator bearing whine
High-pitched whine increasing with engine revs — may also cause battery warning light
Auxiliary belt tensioner or idler pulley
Worn bearing on pulley — whines increase with engine speed
Gearbox or differential bearing
Whine that changes with road speed rather than engine revs
Turbocharger whine
Normal on some turbocharged engines — a change in the whine pitch can indicate a boost leak or worn turbo
Repairs you may need
Typical cost range: £80–£500 — Power steering fluid top-up: low cost. Pump replacement: £200–450. Alternator: £180–420.
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