THERE IS A MAJOR ELECTRICAL PROBLEM WITH SUV I BOUGHT THE DENALI BECAUSE THAT IS SUPPOSE TO BE THE BEST BUT IT HAS BEEN FAR FROM IT... MY NAV SCREEN DOSE NOT WORK IT HAS BEEN REPLACED TWICE AND STILL DOSE NOT WORK.. MY POWER RUNNING BOARDS DO NOT WORK AND THE HAVE BEEN REPLACED AS WELL. MY BACK-UP CAMERA DOSE NOT WORK BECAUSE THE MONITOR IS THE NAVE SCREEN. THE BACK UP SENSORS DO NOT WORK,THE POWER FLIP DOWN SEATS DO NOT WORK AND THE POWER TAIL GATE DOSE NOT OPEN ... IT IS EXTREMELY UPSETTING BECAUSE I BOUGHT THE DENALI FOR $60,000.00 AND GMC'S PROMISE IS WE ARE PROFESSIONAL GRADE AND THIS IS NOT THE CASE HERE.... *TR