Which component is most likely to cause noise during turning when worn?

The noise during turning is most commonly associated with a worn power steering pump. When the power steering pump is functioning properly, it helps provide the necessary hydraulic pressure to assist in steering more effortlessly. If the pump becomes worn, it can produce whining or grinding noises, particularly when under load, such as during turns.

As the pump ages or if it develops internal wear, the pressure may not be sufficient to assist the steering, leading to increased friction and noise. This symptom becomes particularly noticeable when turning, as the demand for hydraulic assistance is greater in that situation.

While other components like the ball joint, tie rod end, or pitman arm can also make noise due to wear, these noises are often characterized by clunking or popping sounds rather than the whining noises associated with steering assistance issues from a power steering pump. Thus, it’s the characteristics of the sound and the context of the operation that identify the power steering pump as the most likely source of the noise when turning.