2021 GMC YUKON Complaints

Once again, the car has been repaired under the recall for the airbags, but once again the cars lights have turned on to state service safety restraint system. I am unable to trust the airbags will deploy with the system being that this issue has been appearing multiple times and reappeared after the recall was complete.

This new 2021 GMC Yukon Denali we purchased on June 2, 2021 has a very sophisticated controls system that includes a feature, entitled "Brake Assist," that is designed to detect "rapid brake pedal applications due to emergency braking situations and provides additional braking to activate the Antilock Brake System (ABS) if the brake pedal is not pushed hard enough to activate ABS normally." "Brake Assist disengages when the brake pedal is released." After I left the dealership (June 2nd), I noticed that the "Service Brake Assist" light had illuminated on the Driver Information Center (DIC). I pulled off the road to check the Owner's Manual, and then continued home trusting that no immediate hazard existed. I subsequently set up an appointment with the dealership for a checkup. A week later, the dealership downloaded a new software package from GMC. The Brake Assist light did not appear when the engine started, so I left for home (50-minute drive at moderate speeds). Enroute to my home, I stopped at a store and turned the engine off. Started home a few minutes later. While accelerating past 45 mph, the brake system independently engaged, which threw me against the steering wheel and into the windshield. As the SUV decelerated through 20 mph, the brakes automatically released. I was not hurt, nor did I lose angular control of the vehicle. I completed my drive home and parked the Yukon normally. Did not drive it again until returning to the dealership a few days later. This second visit did not bear fruit. After significant explorative work, the lead mechanic drove the vehicle several miles under a multitude of conditions, but could not duplicate the problem or get the light on the DIC to extinguish. At my request, the dealership returned possession to me with the light still illuminated. I have driven the vehicle several miles since then with the "Service Brake Assist" light still illuminated. I suspect this is a GMC software problem.

Our vehicle had a warning light of traction system not working - we were told to take to nearest dealer that springs with the valves were faulty and lifters not working. Took it to Everett in Benton, AR. Took two weeks to get the parts to fix. Told this was a problem. We had 4000 miles on the vehicle. Yesterday, it happened again. Told by Cowboy in Heber Springs, AR where we bought the vehicle they had six in their shop with same problem. They advised that our vehicle would have to be towed. GMC does not think it is a safety issue but it is - the vehicle slows down and there is little power to drive. Yesterday I was pulling a bass boat and only made it home with great difficulty. This problem that seems to be prevalent with all the 2021 Denalis needs to be investigated before someone gets hurt or killed. First incident was May 2, 2021 and second (after allegedly being fixed) was June 23, 2021.

Hello, I am a Repair Technician for a General Motors dealership in Reno NV. vehicle in question has no ability to to placed in neutral without the engine running. per GM repair guides the vehicle must either be placed in neutral with engine running or a special tool is needed to placed trans into neutral in to move vehicle. this is a major safety concern as vehicle became engine became disabled and the vehicle could not be moved. steering is locked, parking brake automatically sets and neutral position on gear selector cannot be selected. this happened at our dealership. but i can only imagine this happening to someone on the highway. stuck blocking the road with no ability to move the vehicle to safety. i feel this is extremely dangerous and i am sending an email to General motors technical assistance also.

DRIVING DOWN AN INTERSTATE ON A CLEAR SUNNY DAY 70 DEGREES. THERE WERE NO VEHICLES NEARBY OR AN OVERPASS. IT WAS ME, MY HUSBAND AND OUR DOG IN THE VEHICLE. OUT OF NOWHERE WE HEARD A LARGE BANG AND I NOTICED THE SUNROOF WAS SHATTERED. IT TOOK ALL MY HUSBAND ALL HE COULD TO FROM WRECKING. THANKFULLY I THOUGHT TO CLOSE THE SUNROOF SHADE SO MORE GLASS WOULDN'T LAND IN THE VEHICLE. THERE WERE SHARDS 9F GLASS EVERYWHERE. WE PURCHASE OUR 2021 YUKON 3 MONTHS AGO. SO WE WERE IN A NEW VEHICLE WITH APPROXIMATELY 5K MILES. VERY SCARY AND I WAS STILL SHAKING ONCE WE WERE ABLE TO EXIT THE INTERSTATE. THE SAFETY GUIDELINES FOR PANORAMIC SUNROOF NEED TO BE UPDATED! I HAD NO IDEA THIS WAS AN ISSUE.

THE VEHICLE WAS STATIONARY AND UPON TURNING IT ON A MESSAGE SHOWED UP ON THE DISPLAY STATING TO IMMEDIATELY TAKE THE VEHICLE FOR SERVICE AND TO DRIVE CAREFULLY BECAUSE OF A POWER STEERING ISSUE. ONCE THE VEHICLE WAS PLACED IN REVERSE TO BEGIN TO LEAVE THE PARKING SPOT, IT WAS EVIDENT THAT THERE WAS NO STEERING AVAILABLE ON THE VEHICLE. IT WOULD ONLY MOVE FORWARD AND BACKWARDS BUT THE STEERING WHEEL WOULD NOT MOVE IN ANY DIRECTION AT ANY DEGREE MAKING THE VEHICLE IMPOSSIBLE TO DRIVE SAFELY OR CAREFULLY TO ANY LOCATION. ATTEMPTING TO DRIVE THE VEHICLE FOR SERVICE WOULD HAVE CAUSED AN ACCIDENT AND ULTIMATELY WAS IMPOSSIBLE SO WE DECIDED TO HAVE THE VEHICLE TOWED. THE DEALERSHIP SERVICE DEPARTMENT INFORMED US THAT THIS WAS A PROBLEM WITH THE SYSTEM/SOFTWARE AND THAT THE VEHICLE HAD MANY MORE HISTORY CODES FOR THIS ISSUE. AFTER INFORMING US THAT THE UPDATE FOR THE STEERING SYSTEM WAS COMPLETED, THEY ALSO SAID IT MAY NOT BE THE FIX BASED ON THE MULTIPLE HISTORY CODES. THE CAR IS STILL BEING INSPECTED AS THEY ARE UNABLE TO BE SURE THE CAUSE OR THAT IT WILL NOT OCCUR AGAIN. RECORDS OF SERVICE CAN BE PROVIDED ONCE THE VEHICLE IS RETURNED TO US AND MESSAGES OF COMMUNICATION WITH THE SERVICE DEPARTMENT CAN ALSO BE PROVIDED UPON REQUEST.

TRAVELLING DOWN THE HIGHWAY 69 MPH WITH MY WIFE AND THREE SMALL CHILDREN WHEN THE DASH FLASHED MULTIPLE ERROR CODES, ENGINE SPEED LIMITED TO 62 MPH, AND BRAKES ESSENTIALLY WENT OUT. WAS ABLE TO GET SAFELY STOPPED. CONTACTED DEALERSHIP AND THEY ADVISED SHUTTING IT OFF FOR 20 MIN AND IT WOULD "RESET". IT DID NOT RESET AND WE REFUSED TO DRIVE IT IN SUCH UNSAFE CIRCUMSTANCES WITHOUT ADEQUATE BRAKE FUNCTION ETC. GMC ROADSIDE ASSISTANCE CAME AND TOWED IT AWAY. COULD HAVE RESULTED IN MUCH WORSE OUTCOMES AND WE ARE THANKFUL NO ONE WAS INJURED. VERY NERVOUS TO DRIVE IT AGAIN AFTER WE GET IT BACK, NOT KNOWING IF IT WILL MALFUNCTION AGAIN.

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.

DRIVING APPROX. 62 MPH ON A HIGHWAY, WENT TO SLOW DOWN AND UNABLE TO BRAKE, UPON PUSHING DOWN ON THE BREAK THERE WAS RESISTANCE, AFTER PUMPING THE BREAKS MULTIPLE TIMES I WAS EVENTUALLY ABLE TO SLOW DOWN WITH A LOT OF FORCE. MESSAGES ON DASHBOARD READ "BRAKE SYSTEM FAILURE" "62 MAX SPEED ESC, SERVICE ESC, SERVICE TRAILER BREAK SYSTEM, AND FORWARD COLLISION SYSTEM UNAVAILABLE." ABS, ESC AND CHECK ENGINE LIGHT ALL ILLUMINATED ON DASH SCREEN.

GM CHANGED THE TRAVEL OF THE STEERING COLUMN SO NOW IT'S ONLY A FEW INCHES FROM THE DASHBOARD. IN PRIOR MODELS, THE STEERING WHEEL (SW) TRAVEL WAS MUCH MORE. DUE TO GM'S DESIRE TO SAVE MONEY AND COMPLETE DISREGARD FOR DRIVER, PASSENGER AND OTHER VEHICLES SAFETY, THE DRIVER HAS TO REACH OUT TO THE SW RESULTING AT DANGEROUS ELBOW ANGLES. IN PERFORMANCE CARS, THE SW IS DESIGNED TO BE CLOSE TO THE DRIVER BECAUSE PHYSICS PRINCIPLES OF TORQUE REVEAL: THE GREATER THE ANGLE OF REACH, THE MORE TORQUE IT REQUIRES TO TURN THE SW. SO REACHING OUT WITH THE ELBOW AT ZERO TO 10 DEGREES REQUIRES A MUCH LONGER REACH, THUS GREATER FORCE/TORQUE AND LONGER REACTION TIME, THAN HAVING THE SW AT A 30-40 DEGREE 'ELBOW BEND'. THE POINT IS, FOR A DRIVER TO TURN THE SW ON THIS VEHICLE, IT TAKES TOO MUCH STRENGTH AND TOO LONG A REACTION TIME TO SAFELY OPERATE IT. I DO NOT FEEL SAFE DRIVING THIS MODEL LIKE I DID WITH PRIOR MODEL YEARS. WITH THIS 'LAND YACHT' HAVING AN EVEN LONGER WHEELBASE THAN BEFORE, THE DISTANCE TO THE SW IS EVEN MORE CRITICAL IN REGARDS TO REACTION TIME AND SAFE DRIVING! PLUS, SINCE THE SW IS SO CLOSE TO THE DASHBOARD, WHEN I RAISE MY LEG TO STEP ON THE BRAKE PEDAL (WHICH NOW I HAVE TO DO BECAUSE GM ALSO TOOK AWAY THE FOOT PEDAL ADJUSTER!), MY LEG HITS THE BOTTOM OF THE SW! THE TIME IT NOW TAKES TO BRING A FOOT UP OVER THE BRAKE PEDAL, TO LOOK DOWN TO SEE IF YOUR LEG IS GOING TO HIT THE SW AND CAUSE THE SW TO EITHER STOP MOVING OR RE-DIRECT THE VEHICLE INTO AN UNPLANNED DIRECTION, ALL WHILE TRYING TO STOP THIS OVER 7,700 LB VEHICLE WITH MUSHIER BRAKES THAN ANY MODEL EVER, IS DANGEROUSLY LONG. THE OVERALL REACTION TIME TO GENERALLY STOP THIS MODEL IS AT LEAST 5 TIMES THAT OF MY 2018 YUKON XL DENALI. THE TRAVEL LENGTH OF THE SW NEEDS TO BE INCREASED 2-3 INCHES TO SAFELY OPERATE THIS TRUCK. GM MUST BE HELD ACCOUNTABLE FOR INCREASING DANGEROUS SITUATIONS WITH THEIR VEHICLES!