Mainly when the weather is cold when you start the vehicle, it will say reduced engine power and it will hardly stay running. I just go ahead and let it warm up, then I have to turn it off and wait a little while. Then when I start it again it will be okay most of the time. But sometimes I will be driving and even though it's warmed up, the message will come on again and I have to find a safe place to pull over because when this happens you can't give it any gas. If you try to, it won't go anyways. I just think it is a safety hazard because if you are on the interstate driving 70 mph and it does it you are screwed.