Driving the vehicle and the transmission jerks really hard shifts from 6th gear to 1st gear. This happened while I was driving it. It loses power and won’t go the check manual wrench pops up and then the check engine light comes in. I was doing 50mph when this happened for the second time. First time I was doing 45mph. The dealership I had gotten it from worked on the truck and replaced the computer and it still popped up the same code. Hadn’t had the truck 3 weeks when the first incident happened. Then they had it for 3monhs and got it back saying it was fixed and it done it again on my way home from work. The transmission jumps gears while driving without warning or anything. Put my life and others in harm.