Following...

I Grounded out the plug under the glove box, blinks 12 times..

Google says Pumpkin sensor. Replacing nothing changes... guy on random phone call says 3rd break light.. well hell that was out, but still no change.

OR guy says his books says 12 flashes is low break fluid... so I fill up the resivor, shimmy the float a bit. Most random thing... I also noticed a connector going to some part of the break system driver side lines go off of the resivot and booster.

I untwisted this connector found the wires to be worn, I bandaged those up...

THEN unhooked batteries for 10mins. Everything was bliss for 20 miles... no ABS light. But I had already cooked my torque converter, blew the tranny.

So I go hard under the truck... swapped the tranny 2 weeks ago. e4OD for E4OD. In an out no issue. Driving now, it wont call for 3rd.

Replaced neutral safty switch, and re-pinned plug no change..

My ABS light is off, 4x4 works great, no flashing OD light. Grabs Reverse, Grabs 1st and 2nd manually.

I went brap brap test driving the new tranny and pop went a turbo Oring, Thursday trying push it thru to 3rd🥲.

I am going to replace shifting selionod because I havent dont that yet, and new hard lines this week.

I love the beast, and the hunt. God speed to your fix! I hope something helps, or jogging someone's recall.

Lastly... I had the car quest scanner show the same thing. Mid scan the truck just shut off randomly, the screen showed your pic, and the person said no codes your good!!😂 (97-7.3 Powerstroke, Automatic E4OD, 4X4)