2024 GMC Sierra 1500 Problems

**Subject: Complete Engine Seizure After GM Recall Remedy – 2024 GMC Sierra Denali 1500, 6\.2L V8** I am reporting a catastrophic engine failure involving my 2024 GMC Sierra Denali 1500 equipped with the 6\.2\-liter L87 V8 engine\. At an earlier date, my vehicle underwent GM safety recall 25V274\. The dealership performed the required inspection, changed the engine oil to 0W\-40, and installed the replacement 0W\-40 oil\-fill cap\. The truck was returned to service\. On October 31, 2026, I experienced an unexpected engine shutdown while driving\. The instrument cluster displayed “Please Restart Engine\.” I subsequently brought the truck to a GMC dealership for inspection\. The dealership reported finding nothing wrong and released the vehicle back to me\. On November 3, 2026, while driving home from that inspection, I attempted to pass another vehicle\. While occupying the passing lane, my engine suddenly failed and seized without warning\. The truck lost all engine power and began coasting\. I was forced to maneuver the disabled vehicle off the roadway and into a ditch\. I contacted OnStar roadside assistance, which located my vehicle and dispatched a tow truck\. The vehicle was transported back to the dealership, where it remains\. This engine failure occurred after completion of GM’s official recall remedy and immediately following an additional dealership inspection that found no problems\. I believe this incident warrants investigation under NHTSA Engineering Analysis EA26005, which concerns L87 engine failures following recall repairs\. The sudden loss of propulsion during a passing maneuver created a serious collision hazard\. I request that NHTSA investigate this failure and evaluate the effectiveness of GM’s recall remedy\. **Vehicle:** 2024 GMC Sierra Denali 1500 **Engine:** 6\.2L L87 V8 **Mileage at failure:** 40,035 **Final failure date:** November 3 2026

The contact owned a 2024 GMC Sierra 1500. The contact stated that while driving approximately 65 MPH, there were flames coming from the front passenger side of the vehicle. The contact immediately pulled over and exited the vehicle before the vehicle became engulfed in flames. The Fire Department was called to the scene and extinguished the fire. The vehicle was destroyed and later towed away from the scene. During the fire, the contact sustained a leg and back injury from falling while frantically exiting the vehicle. The cause of the failure was not yet determined. The contact stated that the engine installed at the time of the fire was a replacement engine installed after the original engine had seized and was replaced under NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). The failure mileage was 110,000.

My truck has experienced recurring diagnostic trouble code P244B on [XXX], [XXX], and [XXX], 2026. The latest occurrence included a check-engine warning and reduced engine power. On [XXX], at 40,833 miles, Neil Huffman Chevrolet GMC in Frankfort, Kentucky, diagnosed a damaged diesel particulate filter differential-pressure sensor connector. The dealership's written estimate states that the connector had shorted, begun melting, and had broken wires at the back of the connector. I am concerned about the cause of the electrical overheating, the possibility of additional wiring damage, and the risk of unexpected reduced engine power while driving. I have also experienced intermittent transmission-related warnings and communication fault codes, although I do not know whether these problems are related. I understand there are GM technical bulletins addressing wiring-harness damage on certain 3.0L Duramax vehicles. I am not claiming these bulletins establish the cause of my failure, but I would appreciate having my experience evaluated for a possible safety-related defect trend. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Driving at approximately 45 mph on Berthod Pass in CO, towing a snowmobile flatbed trailer, when dash display indicated "low oil pressure, Turn off Engine". By the time I could read that, the engine was already off and I was all over the road trying to find a way to get off the highway. I did not have opportunity to get off highway, and ended up against a barrier, and partially remaining in traffic. GM towed the car (not the trailer, I had to do that myself) to a dealer quite some distance from my home as opposed to the dealer where I purchased the truck. Then they told me they towed it to a different dealer. After recovering my stuff, I went to the dealer where the truck was, and they said they couldn't look at it for several days. I could not wait several days simply to find out it was going to be a couple of months before id have the truck back. I traded it in on another, larger GMC simply to get out of that engine. What I learned though, is that GM used that exchange to make about $20K. This was more the dealer, but they are part of GM. My original truck was priced below book, and not the book the public can see, but the book they say they go by. They paid me $51K on an $87K truck for trade value. Then they sold the new truck at full price, no break. I was in disaster mode, as I had a large family gathering I was preparing for at our cabin, and did not have time to fight with them. The reason for the low book trade-in value was that the value of these trucks has plummeted because of the very reasons I was replacing it, GM's failure on those engines. My original truck had about 30K miles on it when it blew. The dealer told me that the one I was replacing it with (2026 Sierra HD with 6.6L Turbo Diesel) would get similar mileage, but that was untrue. I get about half the mileage I got in the first truck, and the price of diesel is about 20% more than gas. So they found a sucker on the first truck, then that same sucker bought the second one.

My 2024 GMC Sierra 1500 SLT has recurring failures of its factory 13.4-inch Google built-in infotainment system, creating significant driver-distraction hazards. Google Maps frequently freezes, crashes, or refuses to calculate routes, even to familiar destinations. Navigation malfunctions occur on approximately 90-95% of days I use it, although individual attempts sometimes work. Certain addresses consistently fail while others work. The system also experiences severe lag, intermittent audio interruptions, and voice assistant failures. The assistant often correctly transcribes spoken commands but fails to execute them. When navigation fails, I must resort to my phone to search for destinations, enter addresses, or manually select locations. Repeated attempts to operate the malfunctioning navigation and voice controls have diverted my attention from the roadway. On multiple occasions, this distraction has contributed to unintended lane deviations while driving on highways. These failures create a serious distraction risk, particularly when navigation is needed in unfamiliar areas. The dealership recommended Apple CarPlay as an alternative, but CarPlay causes additional connectivity and infotainment problems, so I have disabled it. The vehicle has undergone three dealership visits for these concerns. First, technicians reprogrammed the infotainment software using USB. Second, they diagnosed radio faults and replaced the infotainment module under warranty. The replacement performed worse, including repeated navigation failures during a trip near Ames, Iowa. On [XXX], at approximately 19,767 miles, Cable Dahmer of Topeka referenced GM bulletin PIC6602Y and advised that GM Engineering is investigating the issue. No further repair was performed, and no resolution timeline was provided The defects remain unresolved despite multiple repair attempts. I request NHTSA investigate whether these widespread infotainment failures constitute a vehicle safety defect INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATI

My truck has experienced recurring diagnostic trouble code P244B on [XXX], [XXX], and [XXX], 2026. The latest occurrence included a check-engine warning and reduced engine power. On [XXX], at 40,833 miles, Neil Huffman Chevrolet GMC in Frankfort, Kentucky, diagnosed a damaged diesel particulate filter differential-pressure sensor connector. The dealership's written estimate states that the connector had shorted, begun melting, and had broken wires at the back of the connector. I am concerned about the cause of the electrical overheating, the possibility of additional wiring damage, and the risk of unexpected reduced engine power while driving. I have also experienced intermittent transmission-related warnings and communication fault codes, although I do not know whether these problems are related. I understand there are GM technical bulletins addressing wiring-harness damage on certain 3.0L Duramax vehicles. I am not claiming these bulletins establish the cause of my failure, but I would appreciate having my experience evaluated for a possible safety-related defect trend. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Subject: Complaint — 2024 GMC Sierra 1500 Denali, Upper Grille Deflector Detached at Highway Speed. To the Office of Defects Investigation, I’m filing this complaint regarding my 2024 GMC Sierra 1500 Denali. While driving on the freeway at approximately highway speed this afternoon, xxx, the upper grille trim piece located above the grille and in front of the hood spontaneously detached from the vehicle with no warning and no prior impact. It created a road hazard for other motorists. This matches the failure pattern described in Recall Query RQ26003, opened xxx, covering 2022 through 2024 Sierra 1500s. My truck is a 2024 and is not covered by Recall 25V-060, which only addressed certain 2022 models. I’m concerned the defect is not limited to the originally recalled population, and that the 2025 remedy may not have resolved the underlying attachment-point failure. I request that NHTSA include my vehicle and all similarly affected 2024 trucks in any expanded recall or investigation, and that GM be required to provide a free repair. Vehicle: 2024 GMC Sierra 1500 Denali. VIN:xxxxxxxx. Mileage: 64,952. Date of failure: xxx. Location: [XXX]. Thank you. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The upper front grille deflector (or chrome hood molding) on 2024 GMC Sierra 1500 AT4 with 38k miles broke off at 65 mph and hit the windshield. It could have cracked or hit a person or another car. No warning or prior issue at all. The plastic clips must have broke

10/01/25: Vehicle brought to dealership for the 6.2L Engine Loss of Propulsion Recall. Engine Passed the Pico vibration test. Oil was changed from 0W-20 to 0W-40. Mileage was 29K. 06/17/26: Engine Seized at 43K miles. Was travelling 50 MPH up a Mtn Pass. Barely had enough momentum to roll to the right shoulder out of traffic. 07/07/26: New motor installed. Back to 0W/20 oil. Since ownership, I have to on a regular basis reset the Collison Warning from Seat Vibration to Beeps. It appears to reset back from Beeps to Seat Vibration every time there is an over the air software update. It might even just randomly reset. I cant tell for sure. I recently had a small backing accident were I was expecting the Beeps to alert me. I mentioned this to my auto insurance company. They told me this was not the first time they have heard of this type of situation.

The vehicle suffers from a persistent transmission defect including shuttering bucking slipping torque converter failure valve body failure twice metal debris improper down shifting chirping noises and related liability and safety issues. The vehicle has undergone multiple unsuccessful repair attempts at authorise GM dealerships. These repairs include torque converter replacement valve body replacement twice solenoid replacement fluid services software updates. The transmission problems have persisted despite these efforts and the vehicle has been out of service for more than 22 business days including a breakdown driving to Florida. I have filed a claim through GM but it seems like it just keeps getting pushed further and further away this is a serious safety issue as I fear for those driving around me and myself that I may cause an accident with the bucking slipping and failure to operate properly on the road.

My truck has experienced recurring diagnostic trouble code P244B on [XXX], [XXX], and [XXX], 2026. The latest occurrence included a check-engine warning and reduced engine power. On [XXX], at 40,833 miles, Neil Huffman Chevrolet GMC in Frankfort, Kentucky, diagnosed a damaged diesel particulate filter differential-pressure sensor connector. The dealership's written estimate states that the connector had shorted, begun melting, and had broken wires at the back of the connector. I am concerned about the cause of the electrical overheating, the possibility of additional wiring damage, and the risk of unexpected reduced engine power while driving. I have also experienced intermittent transmission-related warnings and communication fault codes, although I do not know whether these problems are related. I understand there are GM technical bulletins addressing wiring-harness damage on certain 3.0L Duramax vehicles. I am not claiming these bulletins establish the cause of my failure, but I would appreciate having my experience evaluated for a possible safety-related defect trend. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The truck has shut off driving 5 times total and 3 different days, I was going down the interstate, and Hwy. Speeds were ranging from 45 to 70, this is the 3rd time in the shop. At two different dealers.

Instrument panel is blank. Available for inspection. No speed, fuel or warning lights or directional lights are displayed. No vehicle inspection has been performed by service center.

the rear lights do not function they quit working and there is no parking lights tail lights brake lights

When I begin to accelerate on the highway, and the truck downshifts, it locks up the rear brakes.

At speeds of 65-75, both with the adaptive cruise control enabled and disabled, I accelerated a little bit to pick up speed and pass another vehicle. The vehicle responded initially by gaining speed, then it feels like I hit something and the front brakes lock up for 1-2 seconds and the tires start screeching from sliding, then everything resumes to normal. I was very shocked during a recent roadtrip when this happened 4-5 times. I feel like my safety and my family’s safety is at risk and of the 2 dealerships I called, they don’t prioritize it and make it seem like a minor repair.

top grill deflector flew off at highway speeds creating a safety hazard for me and others in the highway. 2022 GMC Sierra with the same part and grill was previously recalled for this identical issue. 2022-2026 models have the same problem and should be included in the recall. Please see Safety Recall N242490120

The contact owns a 2024 GMC Sierra 1500. The contact stated that there was an unknown failure with the front and rear cameras. The driver's and passengers' side mirror indicators remained illuminated but occasionally failed to operate. There was a glare that was shining into the vehicle while it was raining and driving at night. The vehicle was taken to the local dealer, where it was diagnosed that an unknown module was not operating as needed. The rear wiring harness was replaced. The seat module and transmission were repaired, but the failure recurred. The manufacturer was contacted, and a case was opened. The Attorney General was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 9,000.

My vehicle has experienced repeated and unresolved electrical system failures and unexpected loss of power steering assist. The problem involves multiple warning lights, module communication faults, drivability issues, and simultaneous malfunctions affecting systems including power steering, traction control, transmission, four-wheel drive, and other electronic controls. Repair records, diagnostic information, and videos documenting the failures are available for inspection upon request. The most serious incident occurred on August 23, 2026, when the power steering failed unexpectedly while I was driving. The sudden loss of steering assist made the vehicle difficult to control and nearly resulted in a collision with an oncoming vehicle. The failure created a significant safety risk because it impaired my ability to safely steer and control the vehicle. The condition has occurred multiple times over several months and has resulted in repeated dealership visits. Repairs have included replacement an HVAC controller, but the failures have continued. The vehicle has been inspected multiple times by an authorized dealer, and the manufacturer has been notified through an open support case. As of the most recent repair visit, no confirmed root cause or permanent repair had been identified, and the dealership was still working with engineering support to diagnose the issue. Prior to and during these failures, numerous warning lamps and service messages appeared, including warnings related to power steering, traction control, transmission, four-wheel drive, trailer brake system, steering column lock, and tire monitoring systems. In some incidents, the vehicle entered reduced-performance mode. These warning messages first appeared in November 2025 and have continued intermittently despite multiple repair attempts. The recurring and unresolved loss of power steering assist while driving creates an ongoing risk of crash or injury.

My 2024 GMC Sierra Denali Ultimate 1500 experienced a catastrophic powertrain failure that created a serious safety hazard. On XXX, while driving at highway speeds, the truck unexpectedly shifted into neutral, causing an immediate loss of propulsion. During this event, the electrical system was also affected. The battery power dropped, power steering assistance was lost, and due to the electronic push-button start system, the vehicle could not be restarted while in this condition. This placed me and surrounding motorists at significant risk of a crash. I initially brought the vehicle to Point GMC, where I was advised no issue was found. After the problem continued, I returned on XXX and a dealership technician rode with me. During the test drive on [XXX], the truck again shifted into neutral, confirming the defect. The vehicle was then towed to the dealership, where diagnostics revealed DTC P0016. I was informed the engine had seized and required a complete engine replacement. The engine was replaced by an authorized GMC dealership in New Jersey. After only about 2,000 miles, the check engine light returned and the vehicle began experiencing additional electrical issues. This is a Denali Ultimate, the highest trim level, with advanced electronic systems, making these recurring failures especially concerning. To date, the vehicle has been inspected by three authorized GMC dealerships, and I have opened multiple cases with GMC Corporate. Despite repeated repair attempts, the manufacturer has not provided a permanent resolution. I continue to experience recurring engine and electrical issues and no longer have confidence in the safety or reliability of this vehicle. Given the repeated failures, loss of propulsion, loss of steering assistance, inability to restart the vehicle, and lack of resolution after multiple dealership visits and an engine replacement, I believe this matter warrants investigation by NHTSA. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2024 GMC Sierra 1500. The contact stated that there was an unknown failure with the front and rear cameras. The driver's and passengers' side mirror indicators remained illuminated but occasionally failed to operate. There was a glare that was shining into the vehicle while it was raining and driving at night. The vehicle was taken to the local dealer, where it was diagnosed that an unknown module was not operating as needed. The rear wiring harness was replaced. The seat module and transmission were repaired, but the failure recurred. The manufacturer was contacted, and a case was opened. The Attorney General was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 9,000.

Seat is squeaking loudly like if its loose or something is loose with it dealership and gm dont want to fix it they expect me to pay to fix something that ahouldnt even be happening on a 2 year old vehicle specially when you pay more than 70,000 dollars for a vehicle to be having this issue

I purchased a 2024 GMC SIERRA 1500 Denali Crew Cab Diesel 3.0L After several times bringing the truck to the dealership I purchased from and conduct all service related work. They finally found a crack/whole in the sidewall that was not done by any road hazard to cause damage but looks like a manufacturer defect. This is now not only prominent on one tire but two of the tires. The area is on the covex area of the tire. BRIDGESTONE ALENZA A/S 02 Size 275/50/R22 This is a huge safety concern as a blowout at 65MPH could cause significant harm to not only people in my vehicle but to others. This is an advisement to get the right attention on this before something catastrophic or deadly. With plenty of tread on the tires (6/32), which equated to 50% life on the tire. The dealership is trying to make me pay for a manufacturer defect of $600+ for the two tires.

The contact’s son owns a 2024 GMC Sierra 1500. The contact stated that after coming to a complete stop, the “Service Traction Control” message was displayed on the instrument panel. The contact turned off the vehicle and waited for a while before attempting to restart the vehicle; however, the vehicle failed to restart. The contact stated that the “Service Steering Column” message was then displayed on the instrument panel. A dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 28,140.

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving approximately 65 MPH, the vehicle rolled over a bump in the highway, and the message to "Slow Down" was displayed on the instrument cluster. The contact heard an abnormal metal-on-metal sound coming from the vehicle. The contact had taken the vehicle to a local dealer who diagnosed the vehicle and determined that the supports for the differential and the rear axles had been improperly attached and had become loose. The contact had asked the dealer if the repair could be covered under warranty, and was advised that the repairs were not covered. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 48,000.

The contact owned a 2024 GMC Sierra 1500. The contact stated while his wife was driving at 50-55 MPH, the front passenger side tire detached from the vehicle, and the front passenger side was damaged. The air bags did not deploy. A police report was filed. His wife sustained injuries to the neck and shoulder which required medical attention. The vehicle was not diagnosed or repaired. The vehicle was towed from the scene and deemed a total loss by the insurance company. The contact stated that the ball joint, hub bearing, and 4x4 drive shaft were damaged. The manufacturer was not notified of the failure. The failure mileage was unknown.

This form would only let me select one tire, but all four tires on our truck are like this. They have pretty severe cracking/tread degradation. The mileage is 25,687. This happened suddenly. We have our tires rotated every 3,000 miles. The tire size is 275/50/R22. This appears to be a manufacturer defect. Our truck is garage stored and all paved and highway miles. We have scheduled to have them replaced right away.

The contact owns a 2024 GMC Sierra 1500 equipped with Maxxis Tires, Tire Line: Bravo HT-750, Tire Size: 255/80/R17, DOT Number: 120NK10015028. The contact stated that after the front driver 's-side tire became flat, the contact discovered that the spare tire originally equipped on the vehicle failed to fit the front wheels but did fit the rear wheels. The vehicle was towed to the dealer, who determined that the spare tire failed to fit the front driver's side wheel due to a factory-installed brake modification, causing the spare to not fit over the front brakes. The dealer replaced the front driver's side tire. The manufacturer was made aware of the failure. The tire failure mileage was unknown. The vehicle failure mileage was 14,000.

The contact owns a 2024 GMC Sierra 1500. The contact stated that while attempting to reverse out of a parking space, the transmission failed to respond while in reverse. Additionally, the vehicle operated in LIMP Mode. The vehicle was driven in LIMP Mode to the nearest dealer, who diagnosed the vehicle and determined that the transmission valve body was faulty and needed to be replaced. The transmission valve body was replaced. The vehicle was towed back to the residence from out of state. The manufacturer was notified of the failure. The failure mileage was 6,400.

See attached document for complaint.

While driving a new 2024 GMC Sierra SLT (13,000), I received a prompt to SERVICE SAFETY RESTRAINT SYSTEM. My airbag lamp also illuminated and is now on. Upon researching this issue, it refers to potential failure of seatbelts and/or airbags. I have an appointment tomorrow at the dealership to have them diagnose the issue.

The contact owned a 2024 GMC Sierra 1500. The contact stated while his wife was driving at 50-55 MPH, the front passenger side tire detached from the vehicle, and the front passenger side was damaged. The air bags did not deploy. A police report was filed. His wife sustained injuries to the neck and shoulder which required medical attention. The vehicle was not diagnosed or repaired. The vehicle was towed from the scene and deemed a total loss by the insurance company. The contact stated that the ball joint, hub bearing, and 4x4 drive shaft were damaged. The manufacturer was not notified of the failure. The failure mileage was unknown.

While driving a new 2024 GMC Sierra SLT (13,000), I received a prompt to SERVICE SAFETY RESTRAINT SYSTEM. My airbag lamp also illuminated and is now on. Upon researching this issue, it refers to potential failure of seatbelts and/or airbags. I have an appointment tomorrow at the dealership to have them diagnose the issue.