FICM voltage low when cold

DEESLVRGN · #1 (**permalink**) 01-03-2012, 06:12 AM

Since it started getting cold, around 20*, when I start my truck in the morning, it idles rough and FICM reads about 43-44v according to my insight. Is this normal or does it sound like it's on it's way out. Also, I just took a trip to upstate NY, while driving up there 15-20* outside air temp, my EOT/ECT delta was as high as 17*, once I got back to NC in the warm, it was back to 4-5* delta.

Any feedback is greatly appreciated. Thanks.

Truck now has 167k miles.

Rhys05 · #2 (**permalink**) 01-03-2012, 06:13 AM

I would get it rebuilt, they say less than 45V at any time = rebuild time. Send it to FICMRepair.com, Ed will take care of you!

DEESLVRGN · #3 (**permalink**) 01-03-2012, 06:26 AM

Problem is I can't be without my truck, only vehicle at the moment

Rhys05 · #4 (**permalink**) 01-03-2012, 06:35 AM

If you check out the website, it looks like they might have an exchange program where you can order one (probably paying a core charge) and when it gets to you you install it and send your old one to them.. I don't know, I sent mine to them and it took about a week (including shipping, I didn't do the overnight thing).

**dfuzz78** · #5 (**permalink**) 01-03-2012, 06:45 AM

Not normal. Your FICM is toast. It shouldn't drop below 48 volts anytime.

DEESLVRGN · #6 (**permalink**) 01-03-2012, 07:12 AM

Thanks, I'll check out the site, but doesn't it have to be programmed for specific trucks or am I thinking of something else?

novemberdelta · #7 (**permalink**) 01-03-2012, 07:26 AM

No it doesn't have to be programmed to your truck.

DEESLVRGN · #8 (**permalink**) 01-13-2012, 02:00 PM

Replaced the FICM over the weekend, plugged it in started right up. It wont get more than 47.5V according to my edge . I should've checked before, but i decided to check for codes and came up with p0611. would the code stay there if I put a good FICM in? or would this reman one cause it?

Brieldo · #9 (**permalink**) 01-13-2012, 03:25 PM

Try resetting the trouble codes and see what you get. That code may be lingering from your previous FICM.

Coach73 · #10 (**permalink**) 01-13-2012, 03:50 PM

What about the input voltage? I've noticed that after the glow plugs have cycled my voltage is down to 10.5 - 11, truck starts fine and FICM voltage is always above 48 v. I've been thinking about new batts but hate to throw $300 at it. I load tested both batteries and they passed. Coach

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