Join Date: Oct 2010
Location: York, PA
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No power to FICM . . . occasionally
I've had a few no starts lately. Each time, I can cycle the key (sometimes twice) and it will fire right up. Each time this happens, I get a P0611 and a P1378.
I've got an edge insight with the latest software in it so I can see FICM voltage and HPOP. I've now been allowing the insight to fully boot prior to starting the truck so that I can better see what's going on. HPOP builds very quickly; I have little concern there.
The FICM voltage on my truck has always been 48 or 48.5V; never showed a decrease. However, on some of my recent starts, I've noticed that the FICM voltage displayed on the Insight is 1.0 or 1.5v prior to cranking. Obviously, it won't fire up like that. I then cycle the key and I see a full 48V prior to cranking and it starts immediately.
It is my belief that the displayed 1.0 or 1.5v on the insight is really a measurement error and that the real voltage is zero. I believe that the FICM relay is not closing, therefore providing no voltage to wake up the FICM. This would also explain the P0611 & P1378 codes since the FICM is seeing low (or no) voltage during an attempted start.
The truck is a stock 05.
Thoughts or ideas?
2005 F350 CCLB Dually 4x4 Lariat 6.0L
Coolant flushed & DieselSite coolant filter
New OC & STC upgrade
Turbo lube tubes upgraded
BPD EGR Cooler