At 44.3 volts - you need the FICM rebuilt. Dying when hot can be caused entirely by a FICM.
Run/Cranks Fine, Then just Dies..
I have a bone stock 2005 King Ranch 6.0 Crew Cab Dually 4WD that cranks and runs good, then after some time (30+/-) it just dies or if I shut it off it wont crank back. After it sits several minutes it fires back up. No check engine or codes. I replaced the cam sensor, run it with the ICP unplugged (it still died). I checked the FICM voltage... a sad 44.3 volts, but as mentioned, it cranks/runs fine, it just dies. My diesel knowledge is about a 6 out of 10, so I look to ya'll for help.
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IMO ordering just a new power board for the FICM is not a guarantee to solve your issues. It easily could be the logic side of the FICM that causes the dying when hot - in fact it probably is.
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