NHTSA Complaint #10937793 — 2013 GMC YUKON

THE HYDRAULIC LIFTERS 'AFM' COLLAPSED, LIFTER WAS IN LOCKED POSITION CAUSING LIFTER TO TAP ON CAMSHAFT, BY TAPING ON CAMSHAFT CAUSED DE-LAMENTATION OF HARDENING ON CAMSHAFT, WHICH DAMAGED CAMSHAFT AND LIFTERS. THE ACCELERATION AND DE-ACCELERATION OF THE VEHICLE BECAME A MAJOR SAFETY ISSUE. THE VEHICLE WENT FROM V-8 MODE TO V-4 MODE, THIS ABRUPT REDUCTION IN SPEED WOULD HAPPEN AND DID HAPPEN WHILE DRIVING ON MAJOR ROADS IN THE CITY. BECAUSE THE V-8 LIFTERS WOULD SHUT THE CYLINDERS OFF, V-8 MODE WOULD STAY IN LOCKED DOWN POSITION CAUSING VEHICLE TO ALMOST COME TO A COMPLETE STOP. *TR