mechanical problems

Hello friends, I have a problem with my Station Wagon Renault Scenic year 2002, automatic, I explain when I give contact to the engine and this in motion at 60 km/h light a witness on the board and says car, when you turn on that symbol the mobile one gives a blow and sounds like a way that the marches lowered, I have to stop off the engine and turn it on so that the test does not come out. On two occasions, the greater revolution and speed is like that a change


from the suede was shown, thank you very much