Where is the ecm on a 2003 trailblazer located?

In a 2003 Chevrolet Trailblazer, the Engine Control Module (ECM) is typically located under the hood, on the driver's side near the firewall. It is usually mounted on the engine compartment's rear, near the intake manifold. To access it, you may need to remove some components or covers. Always ensure the vehicle is turned off and disconnected from the battery before attempting to access the ECM.