I have a 2008 GMC Acadia, I was sitting at a light waiting to turn, car was in drive and it started shaking. when the light changed i tried to go and it was extremely sluggish and would not go hardly at all then died. It started right up but when i put it into drive it started shaking and was extremely sluggish. during this the traction sensor on the dash board lit up. I managed to get it to the side of the road and had it towed home. just went out to see if it would go in reverse and it wont even start, all im getting is a grinding noise.