P0404 Code: Exhaust Gas Recirculation Circuit RangePerformance

code p0404  The code may be thrown due to a clogged cat with too much back pressure anyone here ever encounter that or have any other thoughts? Part of that code refers to the EGR control solenoid Did you replace just the EGR valve or the EGR valve and the solenoid? Follow the vacuum

Pulled codes, only had P0404 exhaust gas recirculation control circuit rangeperformance Searched about the code for 10min or so Truck then The code shown each time is “P0404 EXHAUST GAS RECIRCULATION CONTROL CIRCUIT RANGEPERFORMANCE” I was told that I should have the computer flashed

I bought a Puma unlock code for my Nanocom and plugged it in yesterday and I am getting the fault code CODE: P0404 Exhaust gas P0404 means that one of the EGR valves is not working at all but if correct, this could be the end of my 'searching' to establish the cause of my P0404 RP