If a vehicle is making a whining noise when the steering wheel is turned, what is the most likely cause?

A whining noise when turning the steering wheel is commonly associated with issues in the power steering system. One of the primary causes for this noise is low power steering fluid. When the fluid level is low, the power steering pump struggles to circulate the fluid properly, leading to increased friction and noise as it tries to operate under these unfavorable conditions.

In a functioning power steering system, fluid is essential for smooth operation and to reduce wear on the components. When the fluid is low, not only does it result in whining noises, but it can also compromise the effectiveness of the steering mechanism, making steering feel heavier or less responsive.

Additionally, while some other options involve issues that could create noise, such as a belt coming off, these typically present with different symptoms or related issues. The specific association of whining when the wheel is turned is directly linked to the condition of the power steering fluid.