A constant buzzing noise from the power steering pump may indicate which of the following issues?

A constant buzzing noise from the power steering pump is often indicative of air trapped within the power steering system. When air enters the system, it disrupts the fluid's ability to properly lubricate and move through the pump, leading to cavitation. This cavitation creates the buzzing or grinding noise as the pump struggles to maintain pressure. The presence of air prevents the fluid from creating a consistent hydraulic pressure needed for the steering mechanism to function smoothly.

While other issues can contribute to unusual noises in the power steering system, they typically manifest differently. For example, a stuck relief valve may create a different sound related to pressure issues rather than a consistent buzzing. Loose steering components might produce clunks or rattles rather than a persistent buzz, and using the incorrect fluid type could lead to different operational failures and noises. Therefore, recognizing a buzzing noise as a symptom of air in the system can help in diagnosing and resolving steering-related issues effectively.