While driving on the highway, my 2003 gmc sierra 2500 displayed a "reduced engine power" warning on my dashboard. my vehicle lost all speed control, decelerating from 65 mph to 20 mph in a matter of seconds. i immediately pulled over to the side of the highway and shut my truck off. once i restarted the vehicle, the message was gone and my truck was fine. it was a very scary incident not being able keep the right speed for the conditions on the highway. *tr