What do I need to fix im new with cars. I was on the freeway and my 2006 grand prix just started decreasing in speed, I was doing 70 and my speed start going down 30 sec later white smoke came out
Was the smoke coming out from under the hood, or from the exhaust in the rear of the vehicle?
If your engine controller senses a serious problem, it will go into "limp home mode" and you won't be able to drive over 30 mph. I would recommend getting the vehicle towed to a shop to prevent further damage.
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