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Ficm problem....
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Freshman User
Joined: Feb 2011
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Ficm problem....
I will be driving down the road and after 20 mins of driving my ficm voltage will drop to 44.5 volts or so then climb back to normal and it only seems to happen going down the hwy. It is with in spec like when the key on and on start up. its an 05 with head studs and egr delete done to it.
Senior User
Joined: May 2004
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So what exactly is the threshold for criticality on these things?
For example, my FICM voltage oscillate from 45.5(rare occasion of 45) to 48.5 while driving. This is withing operating range, but would it be considered a warning sign? It hasn't changed since I've owned the truck, and it's one of the four Xgauges I keep on religiously.
For example, my FICM voltage oscillate from 45.5(rare occasion of 45) to 48.5 while driving. This is withing operating range, but would it be considered a warning sign? It hasn't changed since I've owned the truck, and it's one of the four Xgauges I keep on religiously.
Lead Driver
Joined: Feb 2011
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From: L.A. (Lower Alabama)
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Senior User
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Is that including KOEO after cold soak? I've seen my start off at 44 on occasion in the AM, but it never stays there for more than a moment.
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Fleet Mechanic
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Low or old batteries can kill a FICM. While they may crank the engine, the crank voltage drops too low and the FICM self-destructs trying to make up for it.
If your batteries are more than three years old, either take them out and condition them, or better yet, replace them. The FICM is remarkably intolerant of old batteries.
-blaine
If your batteries are more than three years old, either take them out and condition them, or better yet, replace them. The FICM is remarkably intolerant of old batteries.
-blaine
Logistics Pro
Joined: Dec 2004
Posts: 4,138
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From: South Weber, Utah
If my FICM even saw 45 volts I would send it out for some loving. Unless it was due to low battery voltage and the battery problem was corrected immediately and the voltage returned to 47.5 - 48.5 then I may let it go.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
I got ya 
.
Yup, 45v or less (
) it's on it's way out, if battery voltage is drooping badly during crank it might "save" the FICM to replace the batteries as Blaine posted above but it's definitely stressing.
. Yup, 45v or less (
) it's on it's way out, if battery voltage is drooping badly during crank it might "save" the FICM to replace the batteries as Blaine posted above but it's definitely stressing.
Elder User
Joined: Apr 2006
Posts: 524
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From: Taylorsville, UT
Just replaced my ficm. I highly recommend ed @ ficmrepair.com. Many, many people here have used him. He has different options as far as warrenty and tuning on them. They are plug and play so no need to go to the dealer afterwards for tuning.
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