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I have seen this before.
The concern was there when the truck arrived at my dealer. By the time I had gone to get the scan tool, and came back out to the truck, the concern was gone. Could not duplicate, ever. It had just had a PCM, pedal, and DPF pressure sensor changed at another dealer.
You have a short somewhere, dropping VREF voltage. It's going to be not very much fun to find, I'm thinking.
You could also have a faulty sensor on the VREF output from the PCM...
Either way, it's not fun to diagnose, even less fun to fix. I had almost 8 hours tied up in searching for this thing, engineering was no help.
Still never found it, and the concern has never come back, and it's been over a year.
Keep me posted with what you find.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.