Hello, new to this forum. My son has a '14 Cruze LS (auto, 1.8L) that he's had since new. Tonight he gets home from work, turns the ignition key off, but the engine won't shut off. We tried shutting it off several times but it still wouldn't shut off. It drives fine and everything else, but the key wouldn't shut off the engine. We ended up unhooking the battery to shut the engine off. Can anyone advise what might be causing this? Thank you in advance.