While driving down the road at random times of the day, random days, random drive periods, random locations, the DIC and touch screen along with radio will shutdown and restart, like rebooting the system or just starting the truck. I loose the mph, gauges, navigation, everything on the dash and touch screen the it will come back on like nothing happened. I have contacted 2 dealers and they say I need to download updates but when I go to update it is not required or needed.

- West Terre Haute, IN, USA

It started year and a half ago involving my tailgate. The buttons to operate by upper and lower tailgate failed to operate on the rear of the truck, but cab button and remote button would open the full tailgate. Returned truck to dealer and they replaced the rear control. It worked for approximate 4 or 5 months the the total tailgate button failed, half tailgate button worked no problem. About 6 mths ago I went to drive to work and hit a bump felt like something bounced but really didn't think of tailgate being open. Drove on interstate for 7 miles at speed of 70 to 75 mph. I had my structural firefighting equip in the bed. Stopped at a drive thru for coffee then drove 5 miles to other side of town to my workplace put truck in reverse and my camera showed the ground, my tailgate was open. Thank goodness nothing fell out of the bed. 2-3 days later left for work, hit bump and felt the rattle in the rear again, stopped and tailgate down, closed tailgate and it opened again immediate after closing. This has occurred numerous times, now the half gate now unmatched along with entire tailgate and opens hitting hitch, scratched paint off. Thought it was me hitting keys in my pocket but continued to occur with key in cab. My mileage warranty passed so I was waiting to get some extra cash to fix the tailgate latches. Have not seen any recalls for GMC sierra 1500 denali, thought I would file a "complaint".

- West Terre Haute, IN, USA

My 2021 GMC 1/2 Serria SLT 4x4 Crew Cab short bed, V-8 Gas engine with Automatic Transmission. I bought this pickup used with apprx. 41k miles on it. I had it about 2 months when I went out to start it and the battery was completely discharged, it would not even click or any lights come on. I hooked it up to a battery charger and got it started, took it to a shop and had the battery and alternator check which both were ok. Drove back home and went out the next morning and the battery was completely drained again, got it started and went an put in a new battery. 16 days later it did the same thing this time it smelled like wires burning when I opened the hood. Called the dealer I bought it from and they put it on a diagnostic machine for over 3 hours could not find anything. Then next morning the battery was again completely drained. Got it started and took it to another shop to get it checked out and after almost 3 hours there they found nothing. Came back home an it sat for just over 40 hours and again the battery was completely drained. I could smell what I think is plastic or rubber when I opened the hood again. My main concern is that this may be a fire hazard and could not only burn up my pick up but my house as well. The check engine light has came on but goes off so I am at a complete loss on this and seems as if GM is not concerned either. I have tried contacting GM but so far nothing other than a note from GM Canada that I need to contact the GM USA, and again that is the only thing I have gotten from anyone. Perhaps this is just a odd thing, I don't know but I do know it is not a safe thing.

- Bowlegs, OK, USA

Tailgate opens when driving and when parked. I thought something must of hit the button on the dash the first time it happened but now it is constantly doing it on its own. It has damaged the hitch.

- Fort Novosel, AL, USA

My son got into the car to drive it and saw a black screen with a message that states -??update failed, see dealer-?? and had multiple languages. Since that date, he has no GPS or backup cam, which he relies on as a new driver. Nothing at all in the info system works.

- Palm Bay , FL, USA

Less than 5 minutes after my husband and 2 children parked the car and came inside, a neighbor walking rang our doorbell to let us know there was something on fire in our driveway. We ran to the back to find his truck engulfed in flames coming from the engine. We quickly called 911 and exited the house/property. The truck continued to burn with 20-25 foot flames and very black smoke for about 40 minutes until the fire department was able to control the fire. The fire was hot enough that the entire engine was significantly burnt, the seats and steering wheel were gone, the glass shattered and melted, and the tires exploded and melted. Thankfully, everyone was out of harms way and safe through this incident. However, it has been extremely traumatic on my family and neighbors and has taken a lot of time and energy to try to deal with this. The car sat in our driveway for over 2 weeks with a very potent smell causing headaches until GM and our insurance finally investigated. There is damage to our siding, driveway, landscaping, basketball hoop, trampoline, and neighbors fence. The car was only 2 years old and scares me how quickly it went up in flames and how much worse this could have been either 3 minutes earlier or if it was parked in our garage.

- Kirkwood, MO, USA

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving at various speeds with the ONSTAR/GPS, turn-by-turn driving directions activated, there was an unknown notification flashing on the instrument panel and radio. The speedometer was obstructed and failed to work as needed. The screen sporadically went blank. While depressing the dismiss button on the steering wheel, the button failed to correct the failure. There were no warning lights illuminated. The vehicle was taken to the local dealer and the system was rebooted; however, the failure recurred. The vehicle was taken back to the local dealer and the contact was informed to turn off the vehicle, open the door, and then restart the vehicle to reboot the vehicle. The vehicle was taken to another local dealer, Bill Cramer Chevrolet Buick GMC (2251 W 23rd St, Panama City, FL 32405) but the vehicle was not diagnosed or repaired. The manufacturer was contacted but no additional assistance was provided. The failure mileage was approximately 10,450.

- Panama City, FL, USA

My truck-€™s battery is dead after sitting for a few days. There is a manufacturing deficit causing parasitic draw. This is a safety issue because it leaves us stranded after parking the vehicle for a few days. The General Motors dealership refuses to do it anything about it. They claim it-€™s normal.

- Boca Raton, FL, USA

The contact owns a 2021 GMC Sierra 1500. The contact stated that while operating the vehicle, the dashboard gauges, instrument cluster, and infotainment center malfunctioned and became inoperable. Additionally, while starting the vehicle, there was a loud cranking sound coming from the engine compartment and the vehicle would not immediately start. The vehicle was taken to the local dealer, but the cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 100.

- Honolulu, HI, USA

The contact owns a 2021 GMC Sierra 1500. The contact stated while using the GPS, the digital speedometer failed to operate as needed. The contact notified the dealer of the failure and the system was rebooted; however, the failure persisted. The manufacturer was made aware of the failure and a case was opened. The approximate failure mileage was 1,000.

- Sheffield, PA, USA

While driving, when approaching speed of 40 mph, the engine begins to have dull shutter intermittently as though I am going over pot holes or rumble strips when I am not. Regardless of time or day or weather the truck has performed in this way. I have had it to the dealership twice for the issue. The first time they said they didn-€™t feel anything and unable to duplicate the problem. The second time, the vehicle was with the dealer for several days trying to determine the other issue it was there for. I requested they again try to recreate the concern. The service assistance asked if I was willing to ride with the technician to see if I could point it out for him. In scheduled a time to do so, when I arrived, the technician was not there. I reside an hour away from the dealership. Making these round trips and getting no where with support or answers. When this happens, I become extremely anxious about the safety of the truck. Also- while 4 X4 is engaged, the truck has significant shutter when going up hill, as though the transmission is going to drop. The entire truck will violently shake.

- Hanoverton, OH, USA

The console radio dash has gone completely black while both driving and while using it for the speaker/phone system. The incident resulted in the entire system restarting.

- Hanoverton, OH, USA

Can turn vehicle off while in gear (drive specifically). When you let off the brake, the truck acts as if it is in neutral. Discovered in my driveway when accidentally forgot to shift into park when I pulled in and pushed the stop button. Truck turned off, which would only expect if in park (or neutral), let off brake, and it began quickly rolling backwards as if it was in neutral. Fortunately the brakes were working, but had any children been riding a bike on the sidewalk or walking by, my truck may have hit them. Had I been more distracted and not noticed initially, it could have rolled into the road and hit my neighbors truck. This behavior can be reproduced every single time, and I can easily supply video.

- Lithia, FL, USA

Less than 300 miles on the vehicle and it has thrown an error code P2B60. Relating to the engine coolant flow control valve position sensor. I have taken it to my local GM service center and they cannot see me for weeks. As of this morning the check engine light has disappeared but my fuel economy has severely decreased. It seems suspicious and possibly dangerous that it showed a check engine light with a warning of reduction in engine power the night before and disappeared in the

- Canton, GA, USA

Started vehicle up in public parking lot and it had service power steering and ESC messages. Vehicle could not turn and had to be towed to dealership. The problem has been confirmed by the dealer but they have had the vehicle for 2 days and cannot fix the problem. Dealer states code keeps coming up in BCM but they are not sure why or how to confidently fix it. There were not warnings or any symptoms of this problem as it drove to work fine that same morning.

- Danville, VT, USA

Prior to this incident I had lifter failure on my 2021GMC SierraAt 8464 miles, I was on my way to work and I heard a loud bang and I had to pullover off the highway, my dad had to come all the way out To get the vehicle because it had major engine damage and it was on a holiday so no one would come help me.The vehicle was in the shop for over a week getting these repairs done, upon receiving vehicle it had been a week and I received service four-wheel-drive messages on the dash.Trying to use four-wheel-drive after this was a no-go every time I push the button nothing would happen it would stay in two wheel drive.After this I made an appointment with the dealership for this issue to be fixed, as I was going to get readyTo leave again with the truck having no issues other than what I-€™ve stated when I went to go start the truck nothing happened at all every light lit up on the dash and part of me thinks it-€™s an electrical issue but the Other part of me thinks the motor is locked up. Also the lights would not shut off when I turn the vehicle off so I-€™ll have a dead battery in the morning.

- Holly, MI, USA

I started my truck this morning, drove it 3 miles, and all of a sudden got an ESC warning, Parking break warning, and a degraded power steering warning all at one time. My steering wheel started vibrating vigorously, a clanking sound started under the hood somewhere, and none of my safety features worked after.. Cruise Control, Vehicle Collision Control, Vehicle Gap sensors, etc.. The vehicle is currently at the dealer being looked at.

- Live Oak, FL, USA

This is the second time I stop at the grocery store for about 15 or 20 min, get back in the car push the start, then the truck keep cranking with no start for about 20 seconds. Then I try second time and it fires up.

- Gresham, OR, USA

The auto stop feature on my truck is dangerous! there is no way to permanently disable it. When pulling into traffic from a stop, there is a significant delay for the car to restart and get moving! I have almost been in several accidents because of this. Forget the $20 in gas this junk might save someone over a year! it is dangerous

- Pembroke Pines, FL, USA

Returned home after some shopping. Parked truck in drive way. Approximately 5 minutes after returning home my wife saw truck smoking from under the hood. Within another minute or two there were visible flames coming from the back edge of the hood. We called 911. Within 5 minutes the entire front end of the truck was engulfed in flames. The fire department arrived and put out the fire but the entire front and cab of the truck was destroyed. Fire investigators determined fire started at back of engine compartment near battery. Vehicle was stopped parked in off condition. In my driveway. No mechanical problems were noticed on ride home and there were no panel alerts for problems.

- Troupsburg, NY, USA