GMC Sierra Complaints (2021)

671 consumer complaints on file.

#11580844April 3, 2024
ELECTRICAL SYSTEM, STRUCTURE:BODY
Tailgate drops without warning, lower button on tailgate doesn't work.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11580979April 3, 2024
STRUCTURE
The contact owns a 2021 GMC Sierra 1500. The contact stated that there was water leaking through the rear sliding window. The dealer was notified of the failure and advised the contact that a fee would be charged for the repair. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 51,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11579498March 26, 2024
STRUCTURE:BODY
My tailgate unexpectedly open as I was driving down the road. (2021 GMC 2500 Denali Sierra) This was the second time this has happened and lost things driving down the road. (3 propane tanks and a small grill the first and then an air compressor the second time) Both times it happened I opened and closed the tailgate with the vehicle running. Both times I was unaware of tailgate opening and did not notice until I got home. The first time it happened I thought it was operator error but after this weekend, I looked into this and see there was a recall on it this month. I still felt it was necessary to report incidents.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11579253March 25, 2024
STRUCTURE:BODY
I have a 2021 GMC Sierra 1500 with a power 6-point tailgate. The inner tailgate has been spontaneously opening for some reason. It seems the electric lock mechanism trips. This could case the contents of my truck bed to fall out. This issue is a known issue for GMC Sierras and a recall has been issued for the 2500's and 3500's but for some reason not the 1500's even though the tailgate is the exact same. I have an appointment to have the issue serviced at dealership, but since there is no current recall they will not cover the expense.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11578882March 22, 2024
ENGINE AND ENGINE COOLING
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at approximately 75 MPH and depressing the accelerator pedal, the vehicle failed to accelerate as intended. The check engine warning light was illuminated. The contact stated that the vehicle would slow down as if it was losing motive power. The vehicle was driven to a local dealer where it was diagnosed that the coolant control valve needed to be replaced. The vehicle was not repaired due to parts not being available. The manufacturer was notified of the failure. The failure mileage was approximately 32,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11577587March 15, 2024
STRUCTURE:BODY
GMC1500 Sierra pick up truck. Rear tailgate dropped today, 3.15.2024. Weather was rainy, tailgate was up at the start of the trip. Contacted GM Corp and was told this model 1500 was not part of the recall??
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11576141March 8, 2024
ELECTRICAL SYSTEM
The harness that hooks to bumper plug for trailer lighting is not completely water tight. Allows water in and creates buildup that weakens the connection as well as allows the plug wire connection to snap out and push out from the pin. Further inspection it was causing a short in the system. I attempted to clean and put some-electric grease on the plug to help clean it but then relaized 3 pins were broken and pushed back.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11576218March 8, 2024
STEERING
Alignment Cam Guide Pins sheared off while driving on highway. Alignment went all over the place and car was drifting side to side. Also, steering wheel spun a quarter turn while car was not turning but still driving on highway. Almost caused me to crash. GMC does not want to acknowledge the issue or allow me to file a warranty claim. Car could not be driven to GM dealership safely and had to be repaired at closest shop
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11575089March 2, 2024
ELECTRICAL SYSTEM
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".
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11575091March 2, 2024
ELECTRICAL SYSTEM
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11574476February 28, 2024
ENGINE
The contact owns a 2021 GMC Sierra 2500. The contact stated that the vehicle was equipped with an engine block heater that he plugged into the vehicle when the weather was below 32 degrees to start the vehicle. The contact stated that he noticed that the engine block heater was causing the GFCI outlet in his residence, to experience an electrical short circuit. The dealer was notified of the failure and informed the contact that it was a known failure. An appointment was scheduled for diagnostic testing. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Campaign Number: 19V328000 (Engine) however, the VIN was not included. The manufacturer was notified of the failure and a case was opened. The failure mileage was approximately 55,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11574295February 27, 2024
ENGINE
I purchased this vehicle used with approx 16k miles on it. Not long after getting it - as I was driving it started dinging and then would shut off. Sometimes I’m in the fast lane going 75Mph and it’ll just shut off. The dealership can’t get it to repeat itself. They said they’ve heard of it happening before but it throws different codes. There’s no rhyme or reason to causing it to shut off, but here lately I don’t even get the warning bell. It just dies on me. As soon as i shift it to neutral and press start it’ll restart instantly. But it’s scary nonetheless, and causes me to drop speed instantly and poses a safety risk especially when I have semi’s or other vehicles close behind.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11570651February 7, 2024
ELECTRICAL SYSTEM
While driving the entire dash cluster (speed,rpm etc) turns off entirely, reloads as if truck is just starting with all lights coming off and on, needles cycling max/min. Unable to recreate on command, multiple others reported same issue with no cause/cure listed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11568867January 30, 2024
UNKNOWN OR OTHER, STRUCTURE:BODY
The tailgate latch is not waterproof, and opens on its own sometimes. this can allow things to fall out of your truck.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11565788January 16, 2024
UNKNOWN OR OTHER
The Flex Tailgate has on multiple occasions has malfunctioned in cold temperatures. I have had instances where I can get it open when I have vital supplies in the bed of my truck because of the Tonneau Cover being on (I have a hard cover made for this truck) and the tailgate malfunctioning. I have also had an instance where my tailgate opened (after clicking shut) while driving without the notification coming up on my dash. I could've been held liable if my equipment fell out and caused an accident. Moral of the story this truck as a lot of issues when temps are below freezing even after being warmed up for 15 minutes or longer. I wouldn't recommend this truck based on the function of the Flex Tailgate. I would prefer a classic a handle and less tech now that I have seen it fail so many times.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11563631January 4, 2024
SERVICE BRAKES
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brakes seized, and the service brakes warning light illuminated. Additionally, the contact stated that the vehicle jerked forward. The vehicle was driven to the residence and parked. The contact stated that the vehicle was turned off; however, the service brakes warning light remained illuminated. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 34,500.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11559776December 12, 2023
EXTERIOR LIGHTING
The driver side headlamp stopped working, Condensate buildup may be a contributing factor. No accident and vehicle is meticulously maintained. No reason for lamp seals to be damaged or wear. Barely three years old and requires a replacement at $1400 for the part and another $1000 in labor. Outside of 36000 mile warranty.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11558217December 3, 2023
ELECTRICAL SYSTEM
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11557590November 30, 2023
PARKING BRAKE:DRIVELINE:HYDRAULIC:ACTUATOR
The contact owns a 2021 GMC Sierra 2500. The contact stated that on several occasions while in park(P) with the parking brake engaged, the parking brake warning light was illuminated. The contact also stated that the parking brake would not disengage until the vehicle was shifted into reverse(R). The contact stated that he observed a loud banging sound coming from the rear of the vehicle when the parking brake was finally disengaged. The vehicle was taken to a dealer where it was diagnosed that the driver’s side rear actuator needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 51,248.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11557188November 28, 2023
WHEELS, UNKNOWN OR OTHER
5 days after purchasing and While driving down the interstate at 80 mph, there was a loud clunk at the same time the back wheels locked up for a split second, long enough to burn the tires and throw everyone in the vehicle forward then the vehicle continued on. It happened three more times, we trailered it and brought it to the dealer. They said nothing is wrong with it. However, I was able to locate the previous owners who stated they'd been bringing it to several dealerships to have it taken care of for the past six months and every dealer said that nothing is wrong with it. But the same thing happened to them for six months. One mechanic in Idaho even replaced the motor trying to fix it and it still continued. The dealer I purchased from never mentioned it having a new motor, and I pulled the Carfax report and it shows several times it was in the shop including the motor replacement, but the shop visits aren't detailed it just says maintenance. Several mechanics we've spoken with say it's in the transmission, drivetrain. But the dealer refuses to do anything unless it'll replicate when they test drive it. But they don't test drive it on the highway or for a long enough time. Multiple owners now in multiple states the same problem and no one will help. This could be a catastrophic incident if the roads had been a little wet or someone was close enough behind us when it happened it would have been a serious car accident, if not worse. I am not sure you can help but Im reaching out to everything that I can find.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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