What 49 owners told NHTSA about the 2021 GMC Sierra 2500 Hd

The contact owns a 2021 GMC Sierra 2500. The contact stated that no visible tailgate was attached, and the contact was unaware if the vehicle had been repaired under NHTSA Campaign Number: 24V060000 (Latches/Locks/Linkages); however, the recall had been marked as completed under the VIN. The vehicle was taken to a local dealer where they advised the contact that the recall repair was completed. The vehicle was taken to another local dealer, Littleton Chevy (851 Meadow St Littleton, NH 03561); for a second opinion and was informed that the recall repairs had not been performed. In addition, the contact stated that the tailgate was replaced with an after-market part due to backorder issues. The contact stated that there was no failure experienced with the original part. The manufacturer was made aware of the issue. The contact had not experienced a failure. The failure mileage was 125,000.

NHTSA ODI 11624010

I purchased a 2021 GMC Denali 2500 in December 2023. A couple days after purchasing the vehicle I received a message on the dash saying the front camera was not working. I took the vehicle into the dealership where they said they reset the computer and nothing was wrong with the vehicle. One month later I was involved in a collision where a vehicle turned in front of my vehicle and the Automatic Emergency Braking failed to activate. I applied the brakes but due to my delayed reaction time 1.5 seconds, I broadsided the small vehicle with my large truck. Luckily the speed was only 20 mph and no one was hurt or killed. At this time I did not know my vehicle was equipped with AEB. In October I discovered through GM and a different dealership that my vehicle was equipped with Automatic Emergency Braking. I have had several occasions when the AEB including the crash where the AEB should have activated but never did. In 11 months I have never had the AEB activate. I took the vehicle into the dealership where I bought the vehicle and they said their computer said everything was operating correctly. The tech never drove the vehicle where the AEB should have activated. I have driven many cars and even the same model vehicle as mine, so I know what the AEB feels like and my vehicle the AEB is not working. The dealership told me to take the vehicle they checked everything GM told them to check. When I talked to GM they told me to immediately take the truck to the dealership and the dealership did nothing.

NHTSA ODI 11623737

The contact owns a 2021 GMC Sierra 2500. The contact stated while driving approximately 70 MPH, the vehicle lost motive power. The contact stated that the message “Vehicle will not Exceed 50 MPH" was displayed. The vehicle was taken to a dealer and remained for over four months after being diagnosed that the solenoid valve and transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 50,000.

NHTSA ODI 11623113

The transmission started lurching and surging power while driving

NHTSA ODI 11609562

Smog system check and Engan warning light keeps come on.

NHTSA ODI 11608733

The contact owns a 2021 GMC Sierra 2500. The contact stated while driving approximately 25–35 MPH, the tailgate unlatched and opened unexpectedly. The contact stated that while the vehicle was parked, the tailgate opened independently. The contact stated that the tailgate down message was displayed after the failure. The vehicle was taken to an independent mechanic at a body shop, who determined that the failure was due to the touchpad. The vehicle was repaired. The vehicle was taken to a body shop, where it was replaced. The contact received notification of NHTSA Campaign Number: 24V060000 (Latches/Locks/Linkages); however, the part to do the recall repair was not yet available. The local dealer was not contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 49,000. Parts distribution disconnect.

NHTSA ODI 11602713

3 year old truck. The left headlight enclosure gained water and caused the whole headlight system to have issues. Water caused the Headlights to Flash high beams (both), turn off and blinkers not to work. This defect the whole side that is effective. This can cause other drivers or the owner to have an accident. 6 months later, Now the right side headlight is doing the same. I’m out of warranty with only 40k miles. The seal is not strong enough to keep water out the enclosure. This can also cause the whole light system to shut down while driving. Very dangerous especially at night.

NHTSA ODI 11583160

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.

NHTSA ODI 11579498

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.

NHTSA ODI 11576141

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.

NHTSA ODI 11574476

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.

NHTSA ODI 11570651

The tailgate latch is not waterproof, and opens on its own sometimes. this can allow things to fall out of your truck.

NHTSA ODI 11568867

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.

NHTSA ODI 11559776

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.

NHTSA ODI 11557590

Passenger headlight light fills up with moisture resulting in the HID module filling up with water and shorting out. The high beam starts flashing when you try to use your turn signal and eventually the headlights completely stop working. Is a known problem, but GM won’t do anything to help if you’re outside of the 3year/36,000 mile warranty. Currently unable to get a new headlight because of the on going strike.

NHTSA ODI 11548799

The owns a 2021 GMC Sierra 2500. The contact stated while driving 70 MPH, the RPM revved up to 6,000 RPM. Additionally, the vehicle lost motive power. The vehicle was taken to the dealer, who informed the contact that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 47,000. The VIN was not available.

NHTSA ODI 11526772

The contact owns a 2021 GMC Sierra 2500. The contact stated while approaching a stop sign and depressing the brake pedal, the brakes were squeaking. The vehicle was taken to the dealer and the contact was informed that the brake pads needed to be replaced. The brakes on the vehicle were replaced but the failure reoccurred. The vehicle was taken to another dealer and the caliper on the front driver’s side was replaced and the failure reoccurred. The vehicle was taken to another dealer who was aware of the issue however, there was no recall for the failure. The manufacturer was not contacted. The failure mileage was 800.

NHTSA ODI 11491956

The “Service Safety Restraint” alarm goes off continually on my 2021 GMC Sierra 2500HD AT4. The warranty is no longer valid as at the time of occurrence I was at 34,500 miles and when I took it in the warranty had expired due to exceeding 36,000 miles. Extended warranties were not purchased and this began approximately 8-9 months after purchase. The code given is “b0014 Driver Seat Side Air Bag Deployment Loop” with a description of high resistance in wiring or wiring harness. After much research I have found that many GMC 2021 vehicles and previous models have had this exact same issue. No dealership as of yet has offered to help or understand that this defect was of their own flawed design. The issue that I am having is exactly the same as other models such as the 2021 Yukon, Sierra 1500, Suburban and others. This is a safety issue and only want GMC to account for their flaw. I do not believe I should have to pay for a design flaw or equipment malfunction that is well known amongst GMC vehicles. I am asking the NHTSA to help me in this matter and the many others who are having the same issue and for the manufacturer to be accountable for their own flaw.

NHTSA ODI 11478489

Hit in the driver side tire, air bags didn’t release. Truck then went up in flames.

NHTSA ODI 11478289

when driving down the rode the center hood scoop blew off 0

NHTSA ODI 11477615

Diesel Exhaust Fluid tank, high pressure

NHTSA ODI 11464852

LT245/75R17 I bought these tires on Walmart. com June 2021 and had Walmart install with road hazard and lifetime balance, I returned to Walmart in April 2022 and was told I had a defective tire, that it was coming apart, I can see the fibers around the issue area and soft spongy for approximately 14 inches sounds like glue not sticking when I push around the bead area, Walmart told me it was a manufacturer defective tire and they included that on the work order and also told me to take tire and contact manufacturer which I did, I have spoken and also emailed with a Michael Dorr with Unicorn Tire. without any positive results only denied a claim. this tire needs to be Inspected and I want a new one, this for sure is defective.

NHTSA ODI 11462517

Brake pads have excessive squealing. Squealing implies incorrect pressure to rotor to stop the vehicle, which highly concerns me as an operator. According to the dealer where I reported the issue, there is a technical bulletin that approves replacement of the brake pads for free if reported in first 7500 miles. My truck exceeded that mileage when I noticed the squealing. If this was a recall for the defective brakes, the dealer would cover the costs to repair, but not for a technical bulletin according to the service department, and confirmed by GMC. I now have to pay $1500 to replace brakes on a new truck with 15000 miles on it, or risk my safety. I believe this should be a recall and appreciate any assistance in this matter.

NHTSA ODI 11441628

THE TRUCK IS PARKED AT DEALERSHIP

NHTSA ODI 11398288