Stangtech

Just wondering it this is normal! I drive a 2016 Ford Fusion Energi Titanium. I have had the car for just over a month. As I am driving and the car switches from EV mode to gas mod. The gas engine seems to slowly engages and get loud. It sounds and feels like the transmission is slipping. My best way to describe the noise it is just like driving a stick shift when switching gears. This seems to happen at lower speeds and at take offs. On the freeway I don't even notice the noise. Its not a super loud noise. But enough for me to be concerned. To me, it Just feels like the tranny is slipping until the engine fully engages. I called the dealer, they said the car would have error codes if the tranny was slipping or if anything was going wrong. He further said, it is most likely normal. Any help is greatly appreciated Mike