P0401 in tow mode - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 22 (permalink) Old 03-13-2014, 06:10 PM Thread Starter
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P0401 in tow mode

I am sure there is a post or two with this question, but my search option is not working.

A few months back I noticed I was getting a CEL when I was towing. At first I thought it was the gas cap. When I made it to my destination I would reset my cap and after the towing was complete (same day) and I was back to normal driving the light would go out. So naturally I thought the drive cycles were met.

I began noticing it every time I towed, but would clear before I had a chance to get the code downloaded. I decided to run it in tow mode everyday and all day without towing anything. With the idea of once the CEL I could swing into checkers. After a week it finally flagged and I made it to checkers and they pulled the p0401.

What is the possibilities?

A little info on My truck; 2004 F350 4door long bed 2wd. The only mods are muffler deleted, bulletproof EGR cooler and intake. There is 175k on the dial.

Thank you in advance for any info.
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post #2 of 22 (permalink) Old 03-13-2014, 09:56 PM
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Re: P0401 in tow mode

That code is for insufficent EGR flow correct? If so, pull the EGR valve and see what it looks like. Might just need a good cleaning.

2005 F350 CCLB Dually
Studded, deleted
5" straight piped
155/30's
KC Stage 1.5
Reg return
Beans sump to the stock pump
BPD FICM
Tuned by several...depends on my mood for the day.
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post #3 of 22 (permalink) Old 03-13-2014, 09:59 PM Thread Starter
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Re: P0401 in tow mode

Cool. I will give it a shot....looks like tomorrow at the earliest.

Thank you
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post #4 of 22 (permalink) Old 03-15-2014, 11:11 PM Thread Starter
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Re: P0401 in tow mode

The CEL light cleared, just as I suspected it would.

Unfortunately today I was driving it down the road and for no reason (steady RPM) I had blow back from the turbo and the CEL popped on. I had it downloaded and now I get a p0401, p0472 and p0611.....

There is several things to choose from, where should I start?
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post #5 of 22 (permalink) Old 03-15-2014, 11:41 PM
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Re: P0401 in tow mode

What do you mean "blow back from the turbo"?

P0472 is exhaust back pressure sensor low input. Could be a bad sensor. Sensor could be clogged with soot, or the tube coming up from the exhaust manifold could be clogged as well.

P0611 is a common one... FICM. Need to test your voltages. I'd do this first and foremost before you screw up injectors. Do a google search for something like "testing FICM voltages". Should get you the procedure. If you can't find it, post back. I'll walk you through it.

Have you had weak batteries lately? Weak batteries will kill a FICM.

2005 F350 CCLB Dually
Studded, deleted
5" straight piped
155/30's
KC Stage 1.5
Reg return
Beans sump to the stock pump
BPD FICM
Tuned by several...depends on my mood for the day.
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post #6 of 22 (permalink) Old 03-15-2014, 11:47 PM Thread Starter
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Re: P0401 in tow mode

The best way to describe the blow back is normally when I let off the throttle the sound of back pressure from the turbo. This time it did it when I was traveling at a steady speed of 55 mph.

As for the batteries, I changed out my batteries about 4 months ago. I changed them because the truck was not wanting to start in the mornings, but every time I had the voltage checked they were good. I changed them as a recommendation.
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post #7 of 22 (permalink) Old 03-15-2014, 11:52 PM
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Re: P0401 in tow mode

FICM voltage is not battery voltage
it will be the cause of the 0611

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post #8 of 22 (permalink) Old 03-16-2014, 12:55 AM Thread Starter
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Re: P0401 in tow mode

I youtubed how to check the FICM and with key turned on I had 48.2V, but as soon as the truck was started it dropped to 42V. I guess I will be buying myself a FICM, but do I buy a complete or go with a power supply?

Im looking at getting the bulletproof FICM

Now about the other 2 faults, are they all tied together or do I have more then one issue?
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post #9 of 22 (permalink) Old 03-16-2014, 04:14 AM
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Re: P0401 in tow mode

You can just get the power supply half of the FICM. That's what goes bad on them. Fix that first and foremost, then see if your other problems persist.

2005 F350 CCLB Dually
Studded, deleted
5" straight piped
155/30's
KC Stage 1.5
Reg return
Beans sump to the stock pump
BPD FICM
Tuned by several...depends on my mood for the day.
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post #10 of 22 (permalink) Old 03-16-2014, 05:14 PM
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Re: P0401 in tow mode

just get the power supply half and save yourself from having the logic side programmed or having another code if you don't program t

also if you choose to go with an overvoltage FICM you may still have a 0611 code ( no CEL) but i'ts ok this time

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