2007 Toyota Tundra 4WD Truck - Squeals

My tundra idles quietly starts to squeal when I increase rpms. Is this a tightening issue or tensioner issue. The belt was replaced 3 years ago. Thank you Doug

Yes, or you have anything driven by the belt dragging.

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The “anything dragging” could be the power steering pump. Check the fluid level if you haven’t recently.

I’d take off the belt and check everything that turns.