Tl* the contact owns a 2018 gmc yukon. on several occasions, while driving various speeds, the forward collision avoidance system and lane departure function became inoperable. the vehicle was taken to gerry lane buick gmc (6615 florida blvd, baton rouge, la 70806, (225) 341-5413) where it was diagnosed that the module for the forward collision avoidance system and lane departure assist module were faulty. the vehicle was not repaired. the manufacturer was not contacted. the approximate failure mileage was 30,800.