99 - TROUBLE CODE P0404/1404

GMC Safari

My engine light just came on and I am not having any other problems. The Van seems to be running fine. I have a code reader and the code came up P0404.

I know the description of the code is Exhaust Gas Recirculation Circuit Range/Performance, but I am not sure what this is saying? Could it be the EGR valve

I reset the DTC and it came back about 10 miles later with a P1404.

Van has 150,000K and it has had the EGR replaced once at around 90,000K

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