Limp mode

Vehicle starts and runs just fine but drive it for a mile or more it goes into limp mode and the engine shuts off when it goes into limp mode. Electronic throttle control light flashes engine light goes on and so does the traction control light. When in limp mode vehicle doesn't start up right away then has rough idle, push the pedal does nothing. Wont drive more then 20 mph.

We have replaced crankshaft position sensor.
Replaced map sensor.
Replaced Accelerator pedal assembly.
Replaced throttle body.

All that has no change with the limp mode issue. What else can be wrong? What else needs to be replaced?