NHTSA Complaint #11612983 — 2020 CHEVROLET SUBURBAN

I put vehicle in Chevy dealership 7/8/24 for cold start knocking sound. Dealers called 2 days later said it was defective lifter issue on the 6.2 liter GM engine.Dealer ordered new engine.on 8/23/24 while test driving vehicle with new engine in it while driving on the highway a fire started under the engine. I was told by dealer that people were telling the driver the vehicle was on fire. He abandoned the vehicle on the highway as it burned up inside and outside. Fire trucks put the fire out.Vehicle is total loss. Waiting two weeks for GM to tell me what they will do to help me. No reply to phone calls or emails unless I call them to check and find out what is going on. I wrote email to GM CEO and no reply. Insurance for me offered me pay out of current value. GMis supposedly going to investigate the vehicle and the cause of fire. Lifter issue is widespread on these engines. Many lawsuits. Vehicle is still in dealer lot burned up waiting for gm to investigate it. I am getting no resolution from GM to help me fully recover from this with new vehicle. If no one had told mechanic that vehicle was on fire who knows if he would have gotten out safely before engulfed in flames. I could not upload additional photos due to site no working.