Why does my 2014 Ram 3500 go into limp mode?

What is your question?

Truck goes into limp mode constantly while driving. It is reading that the fuel PSI is high and that the motor is getting too much fuel. The DEF is deleted. The throttle sensor is always on. The fuel system has been nearly completely replaced: accelerator petal, fuel pump, fuel injector, fuel pump actuator, the rail sensor has been replaced, and the return lines have been cleaned and yet the truck is still going into limp mode. It has been seen by a minimum of 4 different mechanics.

What makes this problem better or worse?

Riding on cruise control improves the drive until the brakes are activated.

How long has your 2014 Ram 3500 had this problem?

Months