While driving My 2019 GMC Sierra I heard a loud Bang And lots of Misfires. The vehicle immediately slowed on its own causing me to pull off the road and endanger myself and traffic around me. Engine light came on and the traction control light was flashing. The Vehicle was brought to Dealer where they Diagnosed the problem all lifter rods were frozen and the cam shaft was cracked. The Dealer has the affected parts.The vehicle was in the repair shop for over two weeks and close to 7,000.00 in repairs.