LNAV is not working

I departed IAH did a 180° turn to head toward LAX. My LNAV was not following my flight plan that I had set and was only going strait.

Hey, was your NAV source set to GPS?

Go in to the navigation tab and check that the source is set to GPS

Maybe I didn’t check that so maybe that was the problem

your source is probably set to nav 1 or 2. change it to gps and it should be fixed