Why does my 2003 Chevy trailblzer make a knocking sound?

A knocking sound in your 2003 Chevy Trailblazer could be caused by several issues, including loose or damaged engine components, worn-out bearings, or problems with the suspension system. It’s important to check the engine oil level and quality, as low or dirty oil can lead to knocking noises. Additionally, the sound could be related to the exhaust system or a failing transmission. To diagnose the issue accurately, it's best to consult a qualified mechanic.