OBD Reader Plug-in

I have an automatic 2000 Chevy Tracker and we cannot find the OBD Reader Plug in. The check engine light came on. We took the car to our local Schucks to get the codes and the people at Schucks could not find the place to plug in the OBD reader. It’s not underneath the dash where it’s supposed to be. Could it be beneath the carpet? Or under the hood somewhere? Help please!!