i have the 58v ficm mod done to my 06 and get that code as well.
the description for p0611 is pretty vague even in fords literature.
following the FICM guide p0611 is described as:
1)FICM memory fault will set if a RAM or ROM fault exists.
2)Loss of FICM Power.
3)Other internal FICM failure.
im thinking that there must be a threshold for min and max output voltage for the ficm and if the voltage goes above or below that threshold then p0611 will be set, which would be along the lines of "other internal ficm failure"
ive tried a few different ficm calibrations in my ficm and p0611 is always there since the 58v mod.
got a weird ficm story, which is what lead me to resoldering and modding my ficm.
the FICM in my truck is the original one and has 3900hrs125000miles on it, last fall i had to replace my batteries due to the stockers going bad. after the batteries died on me several times when trying to start the truck. one day my injectors no longer cycled when the ignition was turned on and i thought "great, complete long block was just installed by ford less than a year ago and now the injectors are already crapping out". we replace and program alot of ficms at our shop and the symptoms for a bad ficm are usually pretty clear, misfires, rough run when cold, after doing some diagnostics we find several injector circuit codes, p0611, truck wont pass injector electrical self test, ficm M power well below acceptable.
funny thing is my 06 had zero codes and would pass injector electrical self test but after monitoring the FICM M power pid with the engine cold and ignition key cycled on FICM M power would drop right down to 30 volts. after waiting for the glow plug light to go out the truck would fire right up, haze a little more white smoke then i was used to but that was it, ficm output voltage would climb up to 40+ volts at idle after the engine was warm.
trucks strategy was vxcf5h5 at that point in time and the ficm cal id was arz2al01.
after disecting the FICM i found 2 of the 4 resistors with broken solders making no connection, after carefully resoldering them the output voltage was steady at 48 like it should be, even after sitting overnight in 30* weather on initial ignition key cycle. injectors also cycled like new once again. and truck ran better. i took the ficm apart once again and did the 58v mod, lol and now i constantly get the p0611 code, so thats my story, no DTCs with failing ficm, but now dtc with repaired/modded ficm, these trucks can be so much fun to diagnose.
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