* Low power steering fluid: This is the most common cause. Lack of fluid leads to increased friction and heat within the pump, causing the whining noise. Check your fluid level and top it off if necessary. If the level is low regularly, you likely have a leak somewhere in the system that needs addressing.
* Worn pump: Over time, the pump's internal components (gears, vanes, bearings) wear out. This wear creates friction and noise. A whining sound often increases with engine speed and steering input. This is a serious issue requiring pump replacement.
* Contaminated fluid: Dirty or low-quality power steering fluid can contain debris that damages the pump's internal components, leading to whining. Flushing the system with new fluid might help if the damage isn't too severe, but a worn pump is likely.
* Worn belt: A worn, loose, or slipping serpentine belt that drives the power steering pump can cause whining, especially at higher engine speeds. Inspect the belt for cracks, wear, or slippage.
* Clogged filter or lines: Blockages in the power steering fluid lines or filter restrict fluid flow, increasing pressure and pump strain, resulting in noise.
* Pump pulley bearing: The pulley that the belt drives can also have a worn bearing, creating a whine. This is often a higher-pitched whine than the pump itself.
Important Note: Ignoring a whining power steering pump can lead to complete pump failure, leaving you without power steering. This can make steering difficult, especially at low speeds or when parking. It's best to have the problem diagnosed and repaired as soon as possible by a qualified mechanic.
