Here's a possibility:
There are 2 thin black wires that pass through the tubular shifter from the O/D Cancel switch. As they exit the hollow shifter, they make a 90 degree turn before traveling down the top of the steering column. At higher miles, it is fairly common for those wires to chafe and/or break from repeated shifter movement. Check fuse #6 in the dash box and remove the top column trim to inspect the wires.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid