NHTSA Complaint #11405900 — 2021 GMC YUKON XL

VEHICLE HAS BEEN AT THE DEALER WITH GM INVOLVEMENT STARTING JANUARY 6TH AND IT HAS BEEN OUT OF THE REPAIR FACILITY FOR LESS THAN 2 WEEKS UP TO TODAY, 4/1/2021. THE VEHICLE HAS AN ADAPTIVE SUSPENSION SYSTEM THAT HAS NOT ONLY FAILED, BUT HAS CONTINUED TO FAIL AFTER MULTIPLE REPAIR ATTEMPTS. THERE SEEMS TO BE AN ISSUE WITH THIS NEW ADAPTIVE SUSPENSION, SPECIFICALLY WHEN THE 'VEHICLE ACCESS' OPTION IS TOGGLED IN THE SETTINGS. THIS HAS CAUSED MULTIPLE SAFETY WARNINGS; 'VEHICLE TOO HIGH, DRIVE SLOWLY VEHICLE UNSAFE' AND 'VEHICLE TOO LOW, DRIVE SLOWLY, VEHICLE UNSAFE'. DEALER AND GM HAVE REPLACES MILLIE PARTS, SOFTWARE AND SENSORS, TO NO AVAIL. THE MAJOR CONCERN IS THAT MOST OWNERS DON'T REALIZE THE RISK AND THIS IS A FLAW IN THE DESIGN WHICH COULD LEAD TO ACCIDENTS. MY VEHICLE HAD TO BE TOWED IN AT THE LAST RESURGENCE BECAUSE IT WAS NOT IN AS STATE TO BE DRIVEN. THE SUSPENSION COLLAPSED AFTER HAVING 35 DAYS IN THE SHOP. IT SEEMS THAT THE SOFTWARE AND THE SYSTEM AREN'T PROPERLY FUNCTIONING/DESIGNED. THIS COULD BE ENDEMIC IN EVERY DENALI, OR OTHER GM VEHICLE WITH THIS SYSTEM, THAT ENABLES THE AUTOMOTIVE ACCESS (VEHICLE LOWERS WHEN IN PARK). THIS ISSUE OCCURRED WHILE PARKED AND WHILE DRIVING, BOTH LOCALLY AND HIGHWAY. THE SCARIEST WAS WHEN I WAS DRIVING TO THE DEALER AND THE SUSPENSION STARTED BOUNCING CAUSING ME TO GO NO MORE THAN 40MPH ON THE INTERSTATE TO THE DEALER.