15401 - STOP DELIVERY ORDER. UNTIL FURTHER INSTRUCTIONS ARE RECEIVED, CERTAIN 2015 MODEL YEAR BUICK ENCLAVE AND CHEVROLET TRAVERSE VEHICLES THAT ARE IN DEALER NEW VEHICLE INVENTORY MUST BE HELD AND NOT DELIVERED TO CUSTOMERS, DEALER-TRADED, RELEASED TO AUCTION, OR USED FOR DEMONSTRATION PURPOSES. GM IS CURRENTLY INVESTIGATING THE THREAD QUALITY OF THE FLOOR-MOUNTED ATTACHING NUTS ON THE REAR-RETAINING BOLTS FOR THE DRIVER AND PASSENGER FRONT-SEATS ON THESE VEHICLES.