There is a whining noise heard only when turning. Which of the following could be the cause?

A whining noise that occurs only during turning is often indicative of an issue with the power steering system. The power steering pump is responsible for supplying hydraulic pressure to assist in steering, and when it starts to wear or fail, it may produce a whining or groaning noise, particularly under load—such as when the wheels are turned.

This sound can occur due to several factors related to the power steering pump, such as low fluid levels, worn bearings, or internal wear that disrupts the normal function of the pump. Since the noise is linked directly to the action of turning, it suggests that the power steering pump is struggling to provide the necessary assistance when the steering system requires it most.

Other components, such as the internal seals in the steering gear, the condition of a ball joint, or the power steering gear itself may lead to other types of noises or issues but are less likely to specifically produce a whining sound only when turning. Therefore, the power steering pump is the most probable cause of a whining noise in this scenario.