EGR blanking with EGR valve on top

Hi, over the last few weeks I've noticed a acceleration a little lumpy and today I got the engine management light which came up as EGR valve fault. I have reset the code but the engine still seems a little lumpy so think the valve may fail soon.
If I blank the valve with a plate will i still get the check engine light if it does fail..or even if it doesn't fail?