2024 GMC Sierra 2500

These are unverified consumer reports filed with NHTSA, shown as submitted.

• 12/28/2025· ENGINE

  Constantly having to clean the map Senor to be able to drive pickup without service emissions alerting me to clean the map Senor or my truck goes in limp mode. This can’t be normal to have to clean this so much. My truck is fairly new and should not be having these issues. Put a scanner on my GMC and the code says P122D. I got on YouTube and I found MANY people complaining about my exact problem for quite some time!

• 12/27/2024· ELECTRICAL SYSTEM

  The contact owns a 2024 GMC Sierra 2500. The contact stated that the vehicle would not not immediately start and had also experienced electrical malfunctions which caused multiple unknown warning lights to display and flash including the seat restraint warning and the ABS and Air Bag warnings. The vehicle was taken to the local dealer who diagnosed that the two batteries located under the hood were faulty and needed to be replaced. Both batteries were replaced and the failure was remedied. The manufacturer was notified of the failure but no assistance was offered. The failure mileage was 40,000.

• 12/19/2025· POWER TRAIN

  Vehicle shudders while accelerating and a constant speed from 1000-3000 rpm. Vehicle will shudder/shake for hundreds of miles at highway speed. Vehicle shakes violently going up steep grade. Vehicle shake is so consistently random it makes passengers ill. Warranty claim denied by GM after issue was recognized by technician.

• 12/17/2025· SERVICE BRAKES

  Premature brake pad wear on all Brakes. All break pads worn down and had to be replaced at or before 25,000 miles. No trailer pulling and only light driving. Dealer stated rotors needed to be turned as well due to extremely low brake life.

• 12/16/2024· SUSPENSION

  Noise coming from rear leaf springs

• 12/12/2023· SERVICE BRAKES

  Towing an RV with solar panels. When the trailer battery becomes fully charged and has a higher charge than the vehicle battery, the trailer brake control module becomes disabled. When this occurs, you have no trailer brakes. Combined weight of truck and RV exceeds 20,000 pounds. Trying to stop with only truck brakes is dangerous, especially if you are on a decent. I not only believe this to be a safety issues, but somebody is going to get killed.

• 12/08/2025· POWER TRAIN

  Upon exiting the freeway, I pressed the gas and the vehicles rpm’s went up to 4K plus on a diesel engine, no acceleration. Thought maybe there was ice and had lost traction, tried again, same thing. Then a shudder, bang and pop. The check engine light went on and informed me of limited power and acceleration. There was no acceleration. Rpm’s would go to 2000 plus just to move. Got it to the dealership and parked it. Made a service appointment. They tried to put it into reverse and it wouldn’t move.

• 11/28/2024· POWER TRAIN

  2024 Gmc sierra Denali ultimate 3500hd equipped with duramax lp5 and Allison 10 speed transmission mission. Towing cargo trailer Thursday November 21 up 4 degree incline transmission let loose banged and popped slammed to a stop almost causing accident and went to limp mode. Took to dealership in show low Arizona. Was told this is common problem and it’s the valve body assembly and parts are 60-90 days out. Mind you this truck was ordered from factory and received in march of 2024. The truck has 21k miles. So now a vehicle I bought specifically for business to haul a spray trailer will be down 2-3 months with no loaner to use to operate our business.

• 11/27/2025· POWER TRAIN

  The transmission is locking up, to the point it stoped pulling, it has been to several dealerships, and they can’t find any problems, put another transmission in the truck and it’s doing the same thing, the dealer ship told us there’s nothing they can do for us!

• 11/27/2024· POWER TRAIN

  Experienced loss of power and inability to maintain highway speeds. The Transmission shifted violently and RPMs went as high as 3500. Was able to move off the highway but cars behind us had to dodge us when it failed. There was warning message on the dash and a CEL. The truck threw two codes P0700, P0747. I was able to limp to a dealer 5 miles away. This is a known TSB with GM. There is a solenoid failure in the Transmission. There is 30-90 day backorder on parts as the failure is so prevalent.

• 11/27/2024· SERVICE BRAKES

  Trailer brake controller will intermittently stop working. “Check trailer wiring” will show up randomly on the display and no trailer braking will be available. This has happened with 3 different trailers. The trailer wiring was gone over and the issue is with the truck. Trailer brakes work with other trucks and aftermarket trailer brake controllers. GMC and dealer were notified and no fix is available. Researching online there are several complaints about this. The trailer brake signal should default to being sent similar to all aftermarket trailer brake controllers. This would be much safer rather than not sending the brake signal at all. This HD truck is rated to tow trailers over 20,000lbs and without trailer brakes it causes an extremely dangerous situation. I was forced to pull over on the highway and purchase an aftermarket trailer brake controller to continue safe travel.

• 11/22/2023· ELECTRICAL SYSTEM

  The contact owns a 2024 GMC Sierra 2500. The contact stated while towing a trailer and driving down a hill at approximately 40 MPH, the integrated trailer braking system error message was displayed, and the trailer braking system failed to activate. The vehicle was later taken to the local dealer who was unable to replicate the failure and failure was found. The dealer later informed the contact that the solar panel system on the trailer might have caused the integrated trailer braking system to malfunction. The contact stated that after turning off the solar panel system the failure persisted. The cause of the failure was not yet determined. The manufacturer was not contacted. The failure mileage was 800.

• 11/07/2024· STRUCTURE

  The contact owns a 2024 GMC Sierra 2500 HD. The contact stated while driving 45 MPH, the tailgate detached from the vehicle. The vehicle was not taken to be diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 3,000.

• 11/05/2024· VISIBILITY

  The contact owns a 2024 GMC Sierra 2500. The contact stated while driving approximately 55 MPH and towing a 28-foot RV, the contact was unable to safely view the blind spot on the left and right sides of the RV using both side view mirrors. The contact stated that the failure had created a dangerous situation while changing lanes. The contact called the local dealer and was informed that the side view mirrors performed as designed, and that there was no fix for the issue. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 5,000.

• 10/29/2025· FUEL SYSTEM, DIESEL,ENGINE

  The contact owns a 2024 GMC Sierra 2500. The contact stated that the vehicle was idling roughly, and the RPM fluctuated between 500 and 1,000 RPM while idling. The check engine warning light was illuminated. Additionally, the contact stated that the fuel economy had decreased to 13 miles per gallon. The contact stated that upon scanning the vehicle, the contact retrieved DTC: P0606 and P062B. The contact related the failure to GM Campaign Number: N232415860 (Fuel Injector Flow Rate Compensation). The dealer was contacted and informed the contact that a fee would be charged for a diagnostic test. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 70,000.

• 10/24/2025· ELECTRICAL SYSTEM,EXTERIOR LIGHTING,SERVICE BRAKES

  This vehicle exhibits the same failure described in NHTSA Recall N232426400 — spontaneous unlatching after rain due to water intrusion into the exterior tailgate release switch. I’m requesting a goodwill replacement under GM bulletin # N232426400 as the failure mechanism and part are identical. It has caused brake failure and nearly killed me because of battery drain while driving. All American Chevrolet of Midland Texas is refusing to solve the problem and says no recall is available.

• 10/23/2023· ELECTRICAL SYSTEM

  When I connect my 2024 GMC Sierra 2500HD to my camping trailer that has a solar panel and solar charge controller, it causes the factory-installed brake controller inside the truck to malfunction. The trailer brakes connect and disconnect 4 times a minute sending alerts to my dashboard. This is dangerous. My trailer weighs up to 14,000 pounds and would have to rely solely on the truck brakes to slow to a stop. GM put out a Document ID: 6379278 / #23-NA-113 "Information on Trailer Brake Disabled or DTC Stored". However, there is no fix. The GMC dealer said they can't find the service bulletin?! Please make this issue a RECALL. I bought this truck to exclusively tow a trailer and now I can't.

• 10/17/2024· ENGINE

  Vehicle surges and stays at 1700 rpm in low range four wheel drive when accelerator pedal is touched Dangerous situation if someone or something is in its path. Dealer is aware of the problem but is unable to repair, says it is inherent on those vehicles for the last couple of model years. (i can't safely hook up a trailer in low range 4X4)

• 10/14/2025· ELECTRICAL SYSTEM

  LED instrument cluster goes blank. No speedometer, no fuel gauge, oil gauge, nothing.

• 10/09/2025· TIRES

  DRIVING THE SPEED LIMIT OF 55 ON A PAVED ROAD, NO WEATHER CONDITIONS AND THE REAR DRIVER SIDE TIRE EXPLODED. WHEN THIS HAPPENED THE TRUCK SLID ACROSS THE ROAD INTO THE OTHER LANE. LUCKILY NO ONE WAS COMING IN THE OTHER LANE AND I WAS ABLE TO GET THE TRUCK UNDER CONTROL. THE TIRE WAS FINE, TIRE PRESSURE WAS CORRECT BUT THE ENTIRE TREAD OF THE TIRE FLEW/BLEW OFF AND CAUSED EXTREME DAMAGE TO THE REAR DRIVER SIDE TIRE WHEEL WELL AND BACK BODY PANEL OF THE TRUCK. THE TIRE IS STILL FULL OF AIR AT THE CORRECT PRESSURE TO THIS DAY. THE TIRE SIZE IS LT 275/70 R 18 125/122 R LOAD RANGE E

• 10/04/2023· UNKNOWN OR OTHER

  Upon starting our 2024 GMC Sierra 2500HD after towing a camping trailer for approximately 200 miles, the following error notifications would cycle every 20 seconds to 5 minutes: "Check Trailer Wiring" "Service Trailer Brake System" The trailer brake would become disabled after these errors, and sometimes would connect with a "trailer brake connected" message, only to repeat every 20 seconds to a few minutes later. During the 60 minutes in which I drove to an RV dealership to have the problem looked at, on multiple occasions, I had no trailer brakes when braking, or had no trailer brakes until the trailer brakes suddenly connected at below the speed of 35 - 25 MPH. GM has acknowledged document ID: 6420021 and bulletin #23-NA-149 that this could happen when pulling a trailer with a battery, generator, or solar charger that has a higher state of charge than the vehicle battery. This is an extremely unsafe condition that could easily cause a rear-end accident or a jackknife condition of the vehicle/trailer combination. GM has known about this issue since at least June of 2023, and as of September, they have an updated trailer brake controller that is supposed to correct this issue. There should be an immediate recall of the vehicles involved to have the trailer brake module replaced with the updated part.

• 09/29/2023· ELECTRONIC STABILITY CONTROL (ESC),ENGINE,LATCHES/LOCKS/LINKAGES

  The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving 30 MPH, the check engine malfunction and Electronic Stability Control system malfunction warning lights illuminated. The contact was inadvertently locked out of the vehicle and was unable to open the tailgate. The contact disconnected the battery to cancel the warning lights; however, the tailgate still failed to open. The vehicle had not been taken to the dealer to be diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 1,000.

• 09/23/2025· POWER TRAIN

  Transmission shifting - faulty shifting between 25 - 55 mph. Took truck to dealership and they state that the radiator leaked coolant into the transmission. They are replacing the transmission and radiator under warranty. Truck only has 21K miles on it. Mostly all highway.

• 09/18/2025· SERVICE BRAKES

  While trailering a large RV the information center sent me two warnings. The first was trailer brakes disconnected the second was service trailer brakes. Took it to the dealer they were unable to replicate so they blew me off.

• 09/13/2023· ELECTRICAL SYSTEM,STRUCTURE

  When the car is on and in park, there is a button on the front console that drops the tail gate. The truck gives you no indication that the button has been pressed or that the tailgate is open. You can then drive the truck with the tailgate open and have no indication or idea. As a result, it is easy to lose gear out of the truck bed while you are driving. This button is located just above a storage compartment and is easy to press while placing items in this compartment. This is a major safety hazard on the road. There is no option to disable this button or be alerted when you tailgate is open.

• 09/09/2025· POWER TRAIN

  The contact owns a 2024 GMC Sierra 2500. The contact stated that transmission fluid was leaking onto the garage floor. The contact stated that while driving at an undisclosed speed, the transmission hesitated before shifting. The contact stated that the check transmission warning light was illuminated. The vehicle was taken to a local dealer; however, the dealer was unable to diagnose the vehicle. The vehicle was not repaired. The contact had inquired if the transmission needed to be replaced, and was informed that transmissions were on a national back order. The manufacturer was not informed of the failure. The failure mileage was 8,808.

• 09/03/2025· TIRES

  The contact owns a 2024 GMC Sierra 2500 equipped with BF Goodrich Tires, Tire Line: K03, Tire Size: 275/70/R18, DOT Number: (N/A). The contact stated that while driving approximately 65 MPH, the vehicle started vibrating. No warning light was illuminated. A dealer was contacted. The vehicle was taken to the dealer where it was diagnosed, and determined that the tires were out of round and provided the contact with several readings on the tires. The manufacturer was contacted, and informed the contact that the tires were out of warranty. The failure mileage was approximately 25,000.

• 09/02/2025· ELECTRICAL SYSTEM

  The contact owns a 2024 GMC Sierra 2500. The contact received notification of NHTSA Campaign Number: 24V894000 (LATCHES/LOCKS/LINKAGES); and the vehicle was taken to a local dealer where the recall repair was performed; however, the contact became aware that the battery was draining, and the vehicle failed to start on more than one occasion. The contact stated that the check engine warning light remained illuminated. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The approximate failure mileage was 41,000.

• 09/01/2025· POWER TRAIN,SERVICE BRAKES

  Problem #1: Trailer brakes failed while pulling 40' fifth wheel trailer. Was driving at about 50MPH on a 55MPH road and was approaching a stop light. I went to apply my truck and trailer brakes simultaneously and quickly found out I had "lost" my trailer brake. This happened another two times within the next 10 mile trip to my house. I immediately disconnected my trailer and took my truck to the shop. The GMC Dealer fixed this issue, however, it is both scary and extremely dangerous to the public when something like this happens on a brand new truck. Problem #2: Right around 30,000 miles I was driving (unloaded) down the road at about 35MPH when I felt a hard clunk in the transmission followed by grinding noises - immediately a notice flashed on the dash stating the truck went into reduced acceleration and the check engine light came on. I brought my truck to a local GMC Dealer to be serviced on June 19th and they advised me it was the Allison transmission valve body. The part has been on back-order and my truck is still at the dealership sitting in the back lot with at least 4 other 2024 HD models. I called GM twice to inquire about Safety Recall N242454440 (covering 2020-2022 GM Vehicles) and recommend that it get extended beyond 2022 since the problem with the transmission valve body has not been resolved yet. I have not heard anything back from them since that call back in June.

• 08/29/2024· FUEL SYSTEM, DIESEL

  The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving at various speeds, the two outside cabs were smoking. There was smoke detected near the fuel tank. The contact stated that there was an abnormal odor of diesel and DEF detected. There were no warning lights illuminated. The vehicle was taken to the local dealer, but the vehicle was not diagnosed or repaired. While driving, there was a lot of smoke detected from the vehicle. The vehicle was taken back to the local dealer, who was unable to determine the cause of the failure. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 100.

• 08/28/2025· ELECTRICAL SYSTEM

  The contact owns a 2024 GMC Sierra 2500. The contact stated that the vehicle had failed to start on several occasions. The vehicle was taken to the dealer, where it was diagnosed with low voltage and electrical failures. The dealer replaced the two batteries; however, the failure recurred. The dealer then replaced one of the batteries; however, the failure persisted. The vehicle was towed to the dealer. The vehicle was not repaired. The manufacturer was notified of the failure, and the contact requested buyback assistance, but no assistance was provided. A case was filed. The failure mileage was approximately 22,000.

• 08/23/2024· POWER TRAIN,VEHICLE SPEED CONTROL

  First date was 04/23/2024 my truck went into limp mode with an alert reading engine and transmission control module problem. Brought it in and they reset the sensors. Shortly after the alert warning goes off again and I turn the engine off and start it back up. It cleared the alert, I brought it back in on 06/15/2024. They reset sensor and fixed a recall on tailgate. I picked up truck, drove it for 2 months and TCM warning came up and threw truck into limp mode while pulling a 2 horse trailer. It turned a 3 hr drive into a 6 hr drive. I brought back to dealer on 8/19/2024 they had it for 4 days and they notified me that this is an on going problem. It is a transmission solenoid valve stuck open and they ordered the part and told me it could be months before the part gets here due to the ongoing backorder from all the other trucks that have the same problem. I use this truck for work and leisure to pull my boat and 2 horse trailer and now I have a vehicle payment to make and no vehicle to use. I cannot use it to work or anything else because it is at the dealer for an unspecified amount of time. I have read online that this is a major problem with this truck and GMC as well as the dealerships know about this problem and they still sold it to me. There are so many complaints online about this GMC 2500 AT4 truck problem that GMC should stop selling this truck.

• 08/21/2025· ELECTRICAL SYSTEM,STRUCTURE

  During a drive home, while in motion, the tailgate of the vehicle opened on its own. This has occurred after the recall to repair this issue was already performed. I know the tailgate was shut prior to the drive because I back into my parking spot and walk the sidewalk behind my truck prior to starting the vehicle.

• 08/20/2025· UNKNOWN OR OTHER

  Loss of audio throughout an entire drive/ignition cycle. This includes the loss of the blinker click/clack audio when the blinker is on. When the loss of audio issue occurs, the driver has no audio input indicating a blinker is on even though the actual blinker is flashing to other drivers. Therefore, an unaware driver (due to no audio feedback) with a blinker left on could have another driver pull out in front of them thinking they intended to turn with the result being a collision.

• 08/20/2025· POWER TRAIN

  Valve Body went out and no eta when its supposed to get in the dealership.

• 08/08/2023· SERVICE BRAKES

  While towing our RV trailer the trailer brakes become disabled. This is a known problem to GM and they have a TSB (23-NA-113) "Information on Trailer Brake Disabled or DTC Stored" This is a know problem and GM solution seems to cast the blame on the trailer manufacture.

• 07/28/2025· POWER TRAIN

  Code P0777 – "Pressure Control Solenoid 'B' Stuck On" – Reduced Propulsion / Reduced Engine Power Initiated While merging onto the interstate, this code triggered a reduction in engine power, limiting my speed to 35 mph on a highway with a posted limit between 40-70 mph. Due to the limited power, I was forced to drive on the shoulder to reach the next exit and pull into a service station. I verified the code using an OBD-II reader at AutoZone. Subsequently, I had the truck towed approximately 1 hour and 30 minutes back home. The vehicle has been at a GM dealership since June 24th, where the faulty valve body has been confirmed. However, there is currently no estimated arrival date for the replacement part, which was ordered on the same date. To my knowledge, the part has only been diagnosed electronically and has not yet been visually inspected. The dealer plans to remove the valve body and transmission pan once the replacement part arrives. Notably, there were no prior warnings, messages, or symptoms before this issue occurred; this code and power reduction were the first indications of a problem.

• 07/23/2026· POWER TRAIN

  While towing my fifth-wheel trailer, I was descending a hill (I had my tow/haul switch engaged) when I noticed an issue with my vehicle. Upon reaching the bottom of the hill and beginning to decelerate, when applying gas to continue up the hill the vehicle shuddered noticeably. A warning light briefly illuminated on the dashboard and then turned off shortly afterward. Although the warning light went away, the vehicle continued to exhibit a slight vibration, particularly between approximately 25 and 50 mph. I was able to drive the vehicle home safely and subsequently brought it to the dealership for inspection. The dealership performed a diagnostic scan and retrieved fault codes. Based on their findings, they have determined that the transmission requires replacement and are proceeding with that repair. They also found a different fluid in the transmission fluid, they skipped the testing and got permission to change out the transmission

• 07/18/2025· POWER TRAIN

  The contact owns a 2024 Chevrolet Sierra 2500. The contact stated that while his son was driving 60-62 MPH in tenth gear, the transmission unexpectedly downshifted to seventh gear. There was an abnormally loud clunking sound coming from the vehicle. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the valve body needed to be replaced. The vehicle was not repaired due to the parts being on backorder. The manufacturer was contacted, but no additional assistance was provided. The failure mileage was approximately 68,000.

• 07/15/2023· ELECTRICAL SYSTEM

  The integrated trailer brake controller does not work on this truck. Specifically, the part is the trailer brake computer module. Trailer brakes went out immediately and continue to disconnect at all times. The problem has been reproduced and confirmed independently. GMC has looked at the problem at dealer and stated they do not currently have a solution. Problem appeared immediately and has continued every single time a trailer is connected to the truck.

• 07/13/2023· ELECTRICAL SYSTEM,SERVICE BRAKES

  When attached to a trailer with solar panels, the truck will intermittently disconnect the trailer electronics which disables the trailer brakes and trailer lights. This is because the solar energy is back flowing to the truck via 7 pin connector and overloading the circuit. Having a truck disable the trailer brakes and lights intermittently is very dangerous. Earlier model years of this truck do not suffer this issue. GM is aware and has TSB but no solution has been found on the truck side without disabling the solar panels on the trailer.

• 07/10/2025· SERVICE BRAKES, HYDRAULIC,VEHICLE SPEED CONTROL

  The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving at an undisclosed speed and approaching a stop, the contact simultaneously depressed the brake pedal and accelerator pedal, causing the vehicle to move forward and to stop simultaneously. The contact stated that the pedals were significantly close to each other. The contact’s foot was sliding off the pedals. The vehicle was taken to the local dealer, and the contact requested for an adjustment of the pedals. The vehicle was not diagnosed or repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 10.

• 07/09/2024· ELECTRICAL SYSTEM,STRUCTURE

  I drove from California to ohio after I bought the truck, I noticed that when stopping to get gas my tailgate was open without me touching it. I drove with cameras showing the truck bed to see what happened and I watched it do it again while driving the vehicle, it just opened on its own while driving. The incident happened again once I was back in ohio when I had my trailor hooked up and it cause the tailgate to collide with the trailor tongue and dented the whole top of the tailgate.3

• 06/27/2025· POWER TRAIN

  The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving 60 MPH, the vehicle went into LIMP Mode. The contact stated that the vehicle then inadvertently lost motive power and was unable to accelerate above 40 MPH. The vehicle returned to normal functionality, but the failure became a regular occurrence. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed failures with the transmission solenoid and transmission control module (TCM). The vehicle was not repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 50,000.

• 06/23/2024· POWER TRAIN,SERVICE BRAKES

  Transmission and transfer case leaking. Masters cylinder ( brake booster) leaking

• 06/18/2023· POWER TRAIN,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL

  The Column Shifter that is installed on all 2024 GMC Sierra 2500HDs and 3500HDs poses a potential safety risk to its passengers and other drivers on the road. When the column shifter of the vehicle is in the standard drive position the shifter covers part of the screen and the direct path to the radio volume control dial and infotainment home button. It has been found and replicated that attempting to interact with the infotainment screen UI and the home button/volume control dial the driver may easily accidentally bump the shifter into the neutral position. Bumping this 8000lbs+ vehicle into neutral unintentionally can be extremely dangerous to its passengers and fellow motorists especially when hauling a heavy trailer or load like heavy-duty pickup trucks are designed to do. Bumping the truck into neutral can allow the truck to lose its acceleration capabilities and degrade braking capabilities as the engine would be disconnected from the drive wheels, limiting engine braking and exhaust braking. This kind of braking is commonly used to help stop the truck with heavy trailers and loads. This problem has been commonly referred to in multiple Facebook groups relating to the 2024 GMC Heavy Duty Truck. I personally have not had it inspected by any third party as there is not much they can do to remedy the issue. I personally recommend that General Motors redesign the column shifter in these trucks shortening it to come no further than the diameter of the steering wheel eliminating any interference with the infotainment system and the home button/volume dial. GM shall replace this updated shifter free of charge in all trucks just recently built. For GM's sake, it is important that this issue is remedied ASAP as the truck just began production and there is a limited amount on the road. This is available for inspection upon request.

• 06/14/2026· UNKNOWN OR OTHER

  The tailgate opens unexpectedly, it can be inspected but it is in for repairs on 6/15/26. There was luggage in the back and it could have fallen out on the freeway. The problem has not been repeated by the dealer, but it has occurred several times in the past. The vehicle had not been inspected by others. There was no warning that the tailgate opened. They start to occur randomly several months ago.

• 06/13/2024· SERVICE BRAKES

  I purchased a 2024 GMC 2500 HD truck to pull a 2021 8,000 lb gvw camping trailer that is equipped with electric trailer brakes. My trailer has functioned perfectly related to the trailer brakes with my previous vehicle (2011 Toyota Tundra). With the GMC 2500, at approximately 3000 miles on the vehicle, a “trailer brake disconnected or disabled” and “check trailer wiring” warning began popping up on my information center of the truck. The trailer braking system would not function, though all other functions of the lighting and camera systems to the trailer worked indicating that the wiring and grounding were not an issue with the trailer. The brake system would intermittently return to normal. And then this warning and disconnected condition (i.e. no functioning trailer brakes) would return. This occurred rapidly, and very frequently. GMC has acknowledged a problem with some vehicles with this problem by publishing a TSB that purports to correct this issue (23-NA-149) that recommends replacement of the trailer brake control module (part no. 212327200000019B). I had this repair performed while on a trip in South Dakota away from my home state in Arkansas and the truck and trailer functioned as normal for approximately 3000 miles of towing. However, the issue has returned and my local GMC dealer repair shop (Little Rock, AR) places the blame on the trailer and not the truck. Towing with this 2024 GMC 2500 HD is very unsafe to the occupants and any others on the road due to loss of braking while towing a heavy load or navigating steep grades with a trailer equipped as described. This problem is now all over GMC/Chevy truck forums and is not just me or my combination. This issue is gonna get people killed.

• 06/08/2026· FORWARD COLLISION AVOIDANCE

  Unexpected braking at highway speeds. This has at least 50 times at highway speeds. The truck has experienced repeated false Forward Collision Alerts and un-commanded Automatic Emergency Braking events. Adaptive Cruise Control frequently detects roadside objects and vehicles in adjacent lanes, particularly on curves. The vehicle has never had windshield replacement, front-end damage, suspension modifications, or aftermarket accessories. This is creating a safety hazard because the truck brakes unexpectedly in traffic at any speed.

• 06/07/2026· POWER TRAIN

  I was merging onto the highway in my 2024 GMC Sierra 2500HD AT4X equipped with the 6.6L Duramax engine at about 50mph when the gauge cluster emitted a “Reduced Acceleration Drive With Care” message followed by a check engine light. The check engine light presented indicated a “P0747” and “P0700” code. The vehicle was then stuck in 5th gear at highway speeds. Luckily there was no traffic present during this event due to the reduced acceleration of the vehicle and confusion caused to the operator. This could have been a dangerous situation due to the sudden change in handling of the vehicle. I have since then had the vehicle towed to the dealership in which it was purchased from for them to do their investigation to see how to fix the issue. This is a very well known issue with these GM heavy duty pickups. There is currently a recall on these trucks for this exact issue but my truck at this point in time is not included in said recall. I believe the recall is for 2020-2022 vehicles. Mine happens to be a 2024 which uses the same transmission as the older model vehicles in the recall. There are many other owners of these trucks like myself who have experienced this exact same issue. I’m sure this isn’t the first time this issue has been reported either. Something must be done about this.