Code P0401-Unplug EGR-Now code P0403, P0405

weberr7 · #1 (**permalink**) 05-17-2008, 07:41 PM

I had the code p0401 so I thought it was time to unplug the EGR. I did it, cleared the code, and then the engine light came on. The codes were P0403 and P0405. I tried to clear them with my scanner but they would not clear. Any help with this would be great.

I have an 03 6.0 Excursion and the engine is completely stock.

doubledee715 · #2 (**permalink**) 05-17-2008, 07:50 PM

that's normal. one of the reasons I don't recommend unplugging it. Plug it back in or go get an entire new egr.

GregsSD · #3 (**permalink**) 05-18-2008, 12:58 AM

I leave my egr unplugged and it gives me the PO403 and PO405 but if I plug the egr back in I can clear the codes with no problem.

Maybe the PO401 code you had is telling you that the egr is bad and that is why the codes won't clear.

SICKS-O · #4 (**permalink**) 05-18-2008, 04:34 PM

pretty sure P0401 is lack of egr flow meaning the computer can tell the EGR system is not functioning correctly

weberr7 · #5 (**permalink**) 05-19-2008, 12:26 PM

Thanks for the info.