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Pulled codes on an '06 f550 today.. no CEL but stored codes were...
All but the last two are pointing at the FICM
Tested the module just a few minutes ago... engine already at temp. Key on, registers 48 volts. Cranking, drops to 47.5.. 48 volts at idle... comes down to ~46 free reving the engine to 2500rpm or so.
That doesnt sound much out of spec if at all to me.. so what could have caused the codes?
The truck runs good.. no misfires... stumbles a little on cold start but clears up as soon as it hits. Power seems to be down a little but not much. No smoke, etc.. Truck has had all 8 injectors replaced in the last 60k miles.
~210k miles on it.
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