P0611 and P1378 - Ford Powerstroke Diesel Forum
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Old 03-28-2011, 07:09 PM
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P0611 and P1378

just for an update i pulled the codes because it killed again on me. Here is a copy and paste of my previous post.

Quote:
Ok well for the first 100k miles i had my 6.0 i always defended it because i had 104k trouble free miles. Since then however its been one a flat bed 4 times.

Just for a little history i replaced the egr cool and oil cooler at 104k.

Had sluggish throttle response and eventually a no start that was fixed simply by wiggling the icp sensor plug.

This newest issue started one morning when on the way to work it started acting weird and eventually died. Found out it was a bad alternator, threw a new one on and everything was grand. Until a couple days later when while i was in traffic as it was going back down to an idle it decided to die. Tried to restart and it wouldn't fire, turned over fine but wouldn't light off. Well about 15 minutes later after i had called a tow truck curiously i tried to fire it up again and it fired right up. Killed it and started it a bunch of times to check and ended up driving it home and then for several weeks with no issue. I did pull the codes and it had an FICM low voltage code. Well everything seemed to be ok, other than the fact that it always runs like crap when i first start it, has trouble gaining rpms or getting up to highway speeds until its at operating temp but its been doing that forever. BTW when i pulled the codes ficm voltage at idle koeo was 46v. Well it ended up doing it to me again today killed while i was driving it and wouldn't restart. Luckily i was right by home depot so i went in there for a little while blew about 15 minutes came out fired it up and drove it home without an issue.

So is it just an FICM issue or could it be something else?

Bill
So before i drop the cash on a new ficm whats everyone's thoughts on the 1378? Could it be something else since that's a supply issue? I did just put a new(autozone) alternator on and it seems to always kill at idle or close to it. Is it common to set both codes when the ficm is bad? Just wanna make sure i spend good money this time around.

Bill
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Old 03-29-2011, 02:47 PM
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I cant answer the questions about the codes but when you tested the FICM you only got 46 volts. Correct?
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Old 03-29-2011, 02:49 PM
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Yeah 46 at cold start up and it would jp to 47 ish when u gave it some gas


Also i talked to the guys at swamps and they seem sciptical that the ficm is causing the stalling issue. I nee o grt a scanner with live data to read it when it does kill. Does anyone know a decent affordable one.

Last edited by blackstang504; 03-29-2011 at 02:53 PM.
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Old 03-29-2011, 02:53 PM
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IMOP I would replace it... FICM is a lot cheaper than injectors.
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Old 03-29-2011, 02:55 PM
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How old are your batteries?
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Old 03-29-2011, 02:58 PM
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Not that old had them both checked at autozone when the alternator went out and they checked out good.
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Old 03-29-2011, 03:09 PM
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well i know those 2 codes will lead you to the same pinpoint tests regardless. if you're sure you're batteries are okay then i'd just put a ficm in it

ideally you should be checking your ficm vehicle power and logic power but you would need IDS
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Old 03-29-2011, 03:10 PM
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Call SWAMPS diesel for a quote on a FICM
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Old 03-29-2011, 03:14 PM
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I was just thinking......... I wonder if you're intermittently losing power to your ficm? based on the symptoms you describe and the codes you've pulled this sounds like a possibility

you may want to try a ficm relay first. it's a cheap guess
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Old 03-29-2011, 03:22 PM
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Quote:
Originally Posted by sinner6.0L View Post
I was just thinking......... I wonder if you're intermittently losing power to your ficm? based on the symptoms you describe and the codes you've pulled this sounds like a possibility

you may want to try a ficm relay first. it's a cheap guess
Could a bad relay cause a Low Voltage to the FICM?
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