Does 2005 Chevy Trailblazer have a key chip?

Yes, most 2005 Chevy Trailblazers have a key chip, also known as a transponder chip, embedded in the key. This chip communicates with the vehicle's immobilizer system to prevent theft. However, there's a small chance a very early or specific trim level might not have this feature, but it's highly unlikely. If you're unsure about your specific vehicle, check your owner's manual or the key itself (often you can see a small black square embedded within the key head).