codes p0404 & p0405
Senior User
Joined: Sep 2010
Posts: 306
Likes: 2
From: Southwest Desert, AZ
Those are EGR codes. Did they just pop up or were you towing up a long hill? Need some more info. I had the same thing. FoMoCo changed oil cooler under warranty and after the warranty I still had them during long uphill pulls. Started with a CEL(check engine light). Deleted EGR valve and cooler. Bought a programmer to cancel the EGR valve removed lite. Still have the EGR valved plugged in though. Runs like a scalded ape uphill, as in towing 8K toy hauler it will accelerate. No codes in appx 9 mos.
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Junior User
Joined: Jul 2010
Posts: 57
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From: hollywood, Fl
no i dont toy anything heavy and i live in fl not alot of hills here!!! lol my truck only in the morning time or after its been sitting for a long period would run sluggish in the morning and then after it heats up it would run fine!!
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From: N. Fort Worth, tx
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Several people on another forum have argued that the P0405 will be thrown with an EGR delete. Is that true?
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
That might be true if they leave the valve out or unplugged since it is a circuit code, but I've never heard that before.
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Junior User
Joined: Jul 2010
Posts: 57
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From: hollywood, Fl
well i removed the egr this morning and it was pretty clean cleaned it up a lil but my truck still runs a lil sluggish in the morning time!! if i bought a new egr would that fix my sluggish problem in the morning??
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