p401 code , cel, wont clear - Ford Powerstroke Diesel Forum
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Old 07-14-2013, 07:19 PM
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p401 code , cel, wont clear

First Time diesel owner, Ive only driven them before never wrenched on one
Its an 04 f350 6.0 auto
I had the cel pop on a 2287 and 401/401 pending
The 2287 cleared itself but the 401 stays on and will not clear with my cheap
Actron code reader
The previous owner has added some things like afm intake,
Bully dog exhaust and boost guage, and there's an sct emblem on
The door.
Ive checked out some pics of the egr system but still dont
Know exactly what im looking for besided the valve itself

There's no driveability issues, no smoke, and it seems to average
About 19 mpg
Is it ok to drive with the cel on? - do I need a better scanner to shut it off?

Sorry if ive rambled any help is appreciated -scott
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Old 07-14-2013, 07:33 PM
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It's an insufficient flow code. Most likely it has either an EGR delete or the cooler is blocked off. Normally the 03-04 model years don't trip the light but it's possible. Only way to get the light out is to have a custom tune written for the SCT that shuts the EGR system off.
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Old 07-15-2013, 03:10 AM
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am I going to be able to physically see if the egr has been blocked off?
the valve is there and plugged in
with the sct , im assuming it was done with the handheld , which didn't come with the truck so looks like ill have to get one
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Old 07-15-2013, 02:33 PM
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Quote:
Originally Posted by ironjet View Post
am I going to be able to physically see if the egr has been blocked off?
the valve is there and plugged in
with the sct , im assuming it was done with the handheld , which didn't come with the truck so looks like ill have to get one
You won't be able to tell if it's blocked. The part that is blocked is the EGR cooler where the up pipe connects to it. If the cooler is still present, it has probably been blocked. If the cooler is gone, then it has a delete. The valve itself needs to be left in place and plugged in. The insufficient code is being set because there is no exhaust gases getting from the up pipe to the EGR valve via the EGR cooler.
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Old 07-15-2013, 05:23 PM
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Looks like the cooler is still on there (pipe about 2" in diameter)
Will it hurt the motor to keep running with ths cel on?
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Old 07-15-2013, 06:43 PM
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It won't hurt it. Will just be annoying.
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Old 07-15-2013, 06:44 PM
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If it's an 04, the cooler should be rectangular and not round.
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Old 07-15-2013, 07:12 PM
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Ill try and get a picture, im sure I was looking at you wrong
Piece .
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Old 07-19-2013, 09:23 AM
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just to be clear, the egr valve bolts into the intake , and the cooler sets underneath the intake on the passenger side?
its definitely stainless round tube
without some disassembly no way to tell what has been done
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Old 07-20-2013, 05:36 PM
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Quote:
Originally Posted by ironjet View Post
just to be clear, the egr valve bolts into the intake , and the cooler sets underneath the intake on the passenger side?
its definitely stainless round tube
without some disassembly no way to tell what has been done
Correct, EGR valve is in the intake. The cooler connects under the intake and runs back to the up pipe. Only way to tell if it has a block off plate is to remove cooler.
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