6.0 P0404 Engine Code

3436 Views 45 Replies 3 Participants Last post by Mitchellgrawe, 10 mo ago

Mitchellgrawe

Discussion Starter · 10 mo ago

So here we go, first off I am not sure if all of these events are connected or just problems unrelated but I think they are. I was driving to one of my customers houses and I got P0404 engine code, (also was blowing a bit of black smoke but no a lot) drove to where I need to be and having a cheap scanner I saw it was EGR related so I pulled the valve and the o rings were chewed up. Neither one was gone but the bottom one had a good tear but was still in tact. So I replaced the o rings and felt it seat it and I even used a bit of oil to lube them up. It worked for about 4-5 days and then booms engine code again P0404 (no smoke this time)…so I replaced the valve altogether and reset the code….I didn’t notice much of a change. I don’t think I have drove it long enough for it to read a check engine light heat, about 70 or so miles. But two weeks prior to the o rings being chewed up I was driving a dump trailer loaded down probably weighed about 7-8k total coming down a two lane highway and I was going to cross over to an access road and as I did this boom no trailer lights. So I pulled over and to me the truck was running different than before. I looked under the fuse boxes two days later and sure enough two fuses had blown, 38 and 4. I also notice a sort of chatter upon acceleration that is harder than before. I pulled the air intakes to take a look at the EBP sensor pigtail and one of the pins was black as the other two were copper looking. So I replaced the pigtail and the engine tan great I started to hear that turbo really whistle and felt the power then poof I made one turn into a neighborhood then it started back again…I ordered an new EBP sensor and I will update if that changes anything but I suspect it will run well then it will acclimate to the computer and run rough again just guessing. Too I pulled the VGT solenoid and the connector broke inside the solenoid like the plastic bits so I quickly plugged it bag inside and order a new pigtail. No difference there but i figured that was a good practice to prevent future problems there. Now one thing to highlight is that I keep getting the SH code from my trailer brake controller making me think I still have a shirt somewhere but I looked and looked but can’t find a bad looking wire. Both batteries are good and alternator is good. I just bought the truck about two months ago and it was running great and then the trailer thing happened… which makes me thing it is possible the trailer had a bad ground and fried a bunch of parts in my truck. I replaced the fuel filters that they had in them that weren’t oem with oem ones along with oem oil filters and changed the cap back to the OEM. Too I replaced the CAG boots on Botha ends as they had one small non stock blue tub on one side and what looked like a ford one on the other side but I still replaced both. Please help, I will update what the EBP does. Let me know what y’all think.

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