P0401 with EGR delete, what gives? - Ford Powerstroke Diesel Forum
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Old 05-08-2012, 08:27 PM
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P0401 with EGR delete, what gives?

so I've had my liberator EGR delete kit in for like 4 years now and the other day I was driving to the cabin with a small load.

I happened to look at the DTC's and noticed I had a P0401 - EGR insufficient flow code.

I cleared it and hasn't come back for over 400 miles.

why would that get triggered when the EGR is deleted.

note - I have the complete uppipe delete and have the egr valve installed and plugged in to eliminate other DTC codes. Also, about 800 miles ago I cleaned my EBP (exhaust backpressure) sensor tube to eliminate another DTC code. lol this motor is a lot of work to keep happy
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Old 05-09-2012, 07:40 AM
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I get that one all the time and I just clear it. It usually doesn't show up unless I take a longer drive or work it hard like doing 80 up the pass and even then it only turns on the engine light once in a while. I can tell when the fan isn't getting up to full RPM then I'll clear it.

I know tunes will take care of it. I just haven't gotten an SCT yet.

BTW...Nice sled. Where you at?

Last edited by ParkCity.PSD; 05-09-2012 at 07:43 AM.
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Old 05-09-2012, 07:44 AM
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see i have an 04 and i don't get a cel, i only found it because every so often i do a read dtc on the insight and noticed it came up.

hmmm....i am not tuned either and that makes sense cause the computer still thinks i have egr. is there actually a flow sensor on the egr? must be. oh well it happens once in a blue moon.
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Old 05-09-2012, 12:08 PM
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I think that the flow is inferred My 04 never threw that code until I got a CTS, once I got the CTS the low flow code would come and my hypertech would read it, custom tunes will fix it. Have you removed your intake butterfly?
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Old 05-09-2012, 05:47 PM
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yes butterfly gone but kept the housing installed with the connector hooked up

I also still have the EGR valve in the manifold with the connector hooked up (per Liberators direction)

Yeah it doesn't throw a CEL on the dash display, its like a passive DTC code.
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Old 05-09-2012, 05:59 PM
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my 06 with the latest calibration will throw a P0401 and set the light but only when it gets warmer out. like 55-60F, all other times it's in memory but no light.
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