Hello, I am Daniel. I may ask you questions, to better answer you. Please let me know if you have any other questions before you Accept.
With as new as your truck is it may just be the fuel pressure sensor. Your pressure would have to be more than 870 psi on the fuel rail pressure to high.
Other possible causes are
the dealer changed two injectors (leaking raw fuel) I would think that in the testing, rail pressure would have been checked and compared to the sensor out put.
The light came on at 55 on the hwy under a light load. The truck runs fine and has power.