The Diesel Stop banner

6.0L FICM Issue?????????????

2752 Views 8 Replies 5 Participants Last post by  Jerry Kittle
Okay my 2005 6.0 Powerstoke is having issue with onlu 60K on it!!!

I was having cold start issues and rough idle that was getting worse so I assumed after lots of reading it was the FICM. So I check it out and the voltage was low around 37 V both with the injectors buzzing and while running.

So I decided to try and repair re-soldering the power side circuit board as I have read so many people do with great results. I followed the process and put back in and got great voltage numbers, 46.4 injectors buzzing, 47.8 while running so I was ecstatic. The drove all day and it ran like new. The next day it fired right up but I had rough idle and it stumbled when I stepped on the gas again. I re-checked the FICM and the voltage was back to 32 Volts basically.

I had the batteries load tested and the 5 year old passenger was bad. It did crank a little slow so this wasn't a surprise. I bit the bullet and bought 2 new Motor Craft 850 CCA and replaced both batteries.

I removed the FICM and re-soldered it again. This time I got 46.4 at injectors buzzing and 47.1 while running. Again it ran great for a while then later today its back to no power and stumbles when you step on the gas but it does start pretty easy.

I'm sure if I check the FICM the voltage will be low again .

While running the batteries are at about 14 volts so I assume the alternator is doing its job.

Not sure where to go from here. I'm afraid the buy a half shell FICM or whole brand new one because I'm not sure whats failing it. The only code I get is the low injector circuit that I'm sure comes back after the FICM falls to low voltage.

I don't just want to start spending thousands on this dang thing as you can easily do with out knowing whats wrong.

Any help is greatly appreciated.

1 - 1 of 9 Posts
Ed, at is the best. Worth the money to get the best one, with lifetime warranty. Lots of very good info on his site. Make sure your batteries and charging system are good, as low voltage, is bad for the ficm.
  • Like
Reactions: 1
1 - 1 of 9 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.