I was driving down the highway at 75 MPH; and noticed my traction control light come on. No sooner than the thought processed about the light my whole dash lit up and indicated engine light, Traction control system, and steering was difficult. I pulled over immediately and turned the vehicle off. I got out checked all the fluids aœall were full and gooda no leaks, cracks, nothing obvious I could see. I got back in and started the engine for a moment and heard a slight knocking on the passenger side of engine and felt a little vibration not present before. After getting it towed and not wanting to risk further damage I got the vehicle to a GMC dealer who then diagnosed that I had a failed lifter on my vehicle. This caused bent rods, leading to internal engine damage and I needed a completely new engine. The odometer reading was 68,231. I have not even had a headlight go out in this vehicle yet. All of my oil change records were up to date. It was past my warranty with GMC so they would not pay for it and wanted me to pay 10,700$ out of pocket. My insurance ended up paying for it. When I inspected the engine myself with a GM mechanic he told me that they have been having ALOT of issues with these lifters being stuck causing catastrophic engine damage. Obviously the 6.2 liter is noticed but my vehicle is a 5.3 liter V8. They believe it is caused by the AFM fuel saving feature where it goes down to 4 cylinders on highway speeds to save gas. This was a nightmare and I was without a vehicle for ALMOST a month to the daya exactly 29 days