Excursion wont start

[youenvious]

I have a 2000 Excursion 7.3, Edge programmer, Banks exhaust. My truck ran trouble free until this past weekend. We pulled into a parking lot shut the truck down, came back out and the engine would not start.
I checked all the fuses, swapped relays around, checked fuel switch inside cab, I removed the cap from the fuel bowl and plenty of fuel, I replaced the cps, when I hooked my programmer up to pull codes I get P1260 (fuel pump speed relay) as per my programmer. When I looked up code P1260 on the internet it comes up (theft detected, vehicle immobilize) if any one has any insight of this issue I sure would appreciate some guidance.

[Banshee34]

Wow strange. Bumping this up for ya!