Where is the ecm located on a 02 Yukon XL?

On a 2002 Yukon XL, the Engine Control Module (ECM) is typically located under the dashboard on the driver's side. Specifically, it is usually mounted to the firewall, behind or near the fuse box. To access it, you may need to remove some panels or covers. Always ensure the vehicle is off and the battery is disconnected before attempting to work on the ECM.