I got the same issue: "Service Electronic throttle", no codes. Truck lost power and barely can reach 40-50 m/h. I used Alfa OBD to monitor Accelerator pedal position D and E readings. Sensor E changes from 0 to 4574 mV, Sensor D changed polarity after about 80% of pedal position, from 6549 mV to -6548 mV. Hopefully, this is just accelerator pedal itself and not something more serious and expensive...