Error code P0404 what is the EGR Valve?

p0404  P0404 Exhaust Gas Recirculation Circuit RangePerformance EGR Valve 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 - EGR 'A' Control Circuit RangePerformance - OBD2 Trouble code: ✓ Meaning ✓ Causes ✓ Symptoms ✓ Diagnostics ✓ Repair guides ✓ Repair costs ➤ Keep P0404 Code: Symptoms, Causes, and Solution

code p0404 and check light flashing Flashing CEL is usually multiple cylinder misfire Sounds like your EGR might be causing a vacuum leak  P0404 = Exhaust Gas Recirculation Open Position Performance Sets when the difference between the desired EGR position and the actual EGR