P0404 Gmc-how do I fix the code

Question

I have changed the egr valve and the catalytic converter, I am still getting the p0404 code. What else could be wrong

Answer 1

P0404 Exhaust gas recirculation circuit range / performance

No EGR flow best describe P0404, plugged either at its intake area or the EGR tube.

 The Jimmy should have a exhaust tube, that area you can check to see if its plugged,