Quote Originally Posted by AnalogVX View Post
Well, I found voltage to the EGR.
Black w/yellow trace 12V
Red 5V
Yellow w/ Red trace 44mv
Green 35mv
Yellow 11V

Would anyone know if these are normal? According to OBD Codes online, I should have 12V and 5V respectively, but has nothing about the others. I would like to not have the ECM flashed as suggested. I will take off the EGR valve and check for carbon build up while I'm here. With all the faulty replacement EGR valve threads, Im kind of leaning to that end.
I've had a recurring P0405 issue also. I am on my 4th EGR valve. I've had three NAPA EGR valves (two replacements under warranty), and am currently running the generic $45 eBay valve with no codes since installation. I wouldn't blame the ECU so fast. These EGR valves are finicky.

I posted an excerpt from the All-Data EGR test procedures a few months back. You might give that a shot.