FICM Voltage

[jmk80]

Just a quick question... I have a 05 350 with a CTS. I have noticed that FICM voltage is sometimes low (as low as 43V.) It is normally around 47-48. I've gotten the batteries checked out and was good (about 1-2 months ago...) Do I have a problem or am I being paranoid? Back ground: I bought the truck in june and drove it to Fairbanks, AK, where I now live. I keep in the garage for the most part but she sits plugged in (oil, trans, block and battery heaters) *when I am at work* and have not had a problem starting. So far I have seen temps down to -47 F. Thanks.

[Bluedemon6.0]

The Ficm probably starting to go out. Probably would not hurt to pull it and have it rebuilt. The Ficm voltage should not ever drop below 47v.

[kinnisoj]

Mine started to do the lil dip down thing and quickly it just got worse. Ive got a rebuild from FICMrepair.com with a atlas 80 tune and reeley like it.

[kinnisoj]

Wow -47!!! Dang! Just curious but you are running synthetic oil right?

[Power Hungry]

Originally Posted by kinnisoj

Mine started to do the lil dip down thing and quickly it just got worse. Ive got a rebuild from FICMrepair.com with a atlas 80 tune and reeley like it.

FICM is starting to fail. Get it fixed or replace sooner rather than later. With the cold weather, it's only going to get worse.

[jmk80]

Thanks all! Oh yes! I am running syn oil for sure! Guess I gotta sort out my FICM... Any thoughts on a 58V upgrade? Truck needs some down time for the Y pipe anyway...

Thanks again

[kinnisoj]

I have yet to hear a good enough argument on the 58v upgrade to get me to spend the cash...

[Power Hungry]

My feelings exactly. After talking with Ed from FICMRepair, he indicated that when a 58V FICM fails, they're usually damaged beyond repair. You end up having to half-shell them.