Consumer Safety Complaints

Incident date: Aug 24, 2026

When I try to start my truck it comes up as service trailer brake control module and it has caused my truck battery to drain so I cant even crank my truck up.

Incident date: Jun 28, 2026

1.Description of the Incident: On 6/28/26, while driving my 2023 GMC Yukon Denali at approximately 70 miles per hour with cruise control engaged, I attempted to take an exit. As I approached the exit, the vehicle’s display indicated that it was not in gear, despite being in motion. This malfunction occurred in heavy traffic, and I narrowly avoided a collision with a semi-truck as I maneuvered to... Read more

Incident date: Aug 8, 2026

Transmission torque converter required replacement

Incident date: Sep 2, 2026

Vehicle passed previous recall for engine defect related to complete engine failure, GM switched oil viscosity. Recall performed 10-16-25. Complete engine failure diagnosed at dealer 9-4-26, related to exact malfunction that sparked recall.

Incident date: Sep 2, 2026

Vehicle passed previous recall for engine defect related to complete engine failure, GM switched oil viscosity. Recall performed 10-16-25. Complete engine failure diagnosed at dealer 9-4-26, related to exact malfunction that sparked recall.

Incident date: Aug 27, 2026

The contact owns a 2022 GMC Yukon. The contact stated that while attempting to make a left turn at an intersection, the vehicle lost automotive power while the accelerator pedal was depressed. The vehicle was towed to a local Firestone, where the fuel pump module was replaced. The local dealer was contacted. Upon further investigation, the contact associated the failure with GMC Emission Recall: N... Read more

Incident date: Aug 24, 2026

While driving my 2019 GMC Terrain with three children as passengers, the vehicle developed a braking/engine problem. The brake pedal became very hard, and the vehicle subsequently became undrivable and would not start. I received no advance warning through the GMC app indicating that the vacuum pump was failing. The vehicle was towed to a GMC dealership. The dealership diagnosed a failed vacuum p... Read more

Incident date: Aug 24, 2026

While driving my 2019 GMC Terrain with three children as passengers, the vehicle developed a braking/engine problem. The brake pedal became very hard, and the vehicle subsequently became undrivable and would not start. I received no advance warning through the GMC app indicating that the vacuum pump was failing. The vehicle was towed to a GMC dealership. The dealership diagnosed a failed vacuum p... Read more

Incident date: Sep 3, 2026

The shark fin antenna has a plastic cover that is only held on by 4 plastic clips. Hi winds or car wash can compromise the cover by breaking at least two of the plastic clips allowing air to get underneath the cover and then the cover falls off. I consider this a safety issue due to the fact that if your on a highway and it comes off it can crash thru another vehicle’s windshield causing a colli... Read more

Incident date: Dec 15, 2025

The engine needed to be replaced with just over 2,000 miles.

Incident date: Oct 23, 2021

Within the first 3 years of purchase as a new vehicle, my 2018 GMC Sierra Denali equipped with the GM 8L90 automatic transmission developed a pronounced judder during light acceleration, resembling driving over rumble strips. The condition was first reported to an authorized GMC dealer on October 23, 2021, at 26,648 miles while the powertrain warranty was in effect. GM authorized a transmission-fl... Read more

Incident date: Jun 1, 2026

The contact owned a 2026 GMC Sierra 1500. The contact stated that while slowly driving up a slightly inclined driveway and making a left turn, the engine shut off. The contact stated that either the parking brake activated, or the vehicle suddenly decelerated. The contact stated that the failure had occurred several times, with three identical vehicles, including the loaner vehicle provided by the... Read more

Incident date: Sep 3, 2026

Vehicle ran out of fuel and became disabled in an active roadway/exit ramp. The vehicle retained 12-volt electrical power and the dashboard and electronic controls remained operational. With the brake pedal depressed and the ignition/electrical system on, I attempted to shift the transmission from Park to Neutral so the vehicle could be pushed out of traffic. The vehicle repeatedly displayed “Co... Read more

Incident date: Jul 20, 2026

2020 GMC Sierra 1500 AT4, 3.0L LM2 Duramax. In service 08/13/2020. Five glow plug failures on five different cylinders in under 19,000 miles, all at one GM dealer, all part 24000504: Cyl 1, 10/21/2024, 38,650 mi, P0671, RO 13714, warranty. Cyl 6, 11/05/2024, 38,793 mi, P1330, RO 26665, warranty. Cyl 4, 11/29/2024, 39,683 mi, P133B, RO 57498, warranty. Cyl 3, 01/22/2026, 52,959 mi, P0673/P06C7/P13... Read more

Incident date: Aug 29, 2026

I purchased a 2024 GMC Sierra 1500 Denali Ultimate equipped with the 6.2L V8 engine on XXX. The vehicle currently has approximately 25,000 miles. On XXX, the vehicle underwent the GM recall repair related to the 6.2L engine at Don Mealey Chevrolet. On XXX, approximately nine months after the recall repair, my family and I were traveling on the [XXX] with my two children inside the vehicle when ... Read more

Incident date: Jul 25, 2026

So I spent many months trying to aquire a GMC Sierra Denali and with all the issues with the 20 - 24 6.2 engines we were assured by the dealer that all the issues were resolved with the 2025 6.2 models. So we spent big to aquire an 2025. So I bought one new. My truck had 8000 miles on it with 2 oil changes. So we booked a trip to [XXX] at considerably a large expense and loaded up our Harley's on ... Read more

Incident date: Sep 3, 2026

The contact owns a 2026 GMC Sierra 1500. The contact stated that while slowly driving up a slightly inclined drive port and making a left turn, the vehicle shut off and the parking brake was activated or the vehicle suddenly decelerated. The contact stated that the failure had occurred on several occasions with three separate identical vehicles, including the loaner vehicle provided by the dealer.... Read more

Incident date: Aug 30, 2026

Sunday XXX, we were riding in our 2022 Yukon Denali with my wife driving on [XXX] at the speed limit of 75 mph when the vehicle stumbled for a moment then returned to normal operation... a few seconds later the engine just died. No drive information center warning or check engine light, no funny noises or catastrophic banging. It just quit running. There was traffic on the highway but with my w... Read more

Incident date: Aug 8, 2026

L87 recall was completed on 10/22/2025. On August 8th 2026 the engine developed a loud knock. It was taken to the dealership on 8/31/2026 after inspection it was determined that the engine had failed and needed to be replaced. There was no warning lamps that indicated there was an issue with the engine. The vehicle was still driveable when it was taken to the dealership. If the engine had compl... Read more

Incident date: Aug 16, 2026

2023 Yukon Denali, 6.2 Engine. Owner complied with first GM recall and the engine passed inspection. 8/16/26 Engine started making a knocking sound. 8/17/26 Yukon was taken to the dealership and diagnosed as complete engine failure. There were no warnings indicated on the dash. Yukon is currently still at the Dealership with no repair date issued. Today is 9/3/26. I have contacted GM regarding a p... Read more

Incident date: Aug 15, 2026

1. My vehicle is having transmission issues with shuddering and shifting. M5U RPO code 8L90 transmission. 2. My safety and the safety of others is a concern if the transmission is not working as intended my vehicle could be at risk an accident that could be avoided. 3. The problem has not be reproduced or confirmed by a dealer I work on my own vehicles and I am going to repair this issue myself if... Read more

Incident date: Sep 2, 2026

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving 70 MPH and looking in the driver’s side mirror, the contact became aware that an unknown object had detached from the vehicle. The contact was unaware that the chrome front grille deflector had detached until arriving at the residence. The dealer was contacted, and the vehicle was taken to the dealer to be diagnosed, ... Read more

Incident date: Jun 21, 2026

The vehicle was part of the GM L87 engine recall. The vehicle was taken to the dealership in late 2025 for recall service. The dealership inspected the vehicle for vibration and determined that it required an oil change and updated service manual to require 0W-40 oil. On June 21, 2026 the vehicle experienced an engine failure.

Incident date: Apr 29, 2026

Lifter locked up causing bent push rod. This situation caused truck to strand the driver without warning. Truck needed to be towed. This repair was performed by the dealership and is a known issue with 6.2 L engine.

Incident date: Aug 28, 2026

I got a yukon at4 and I had to replace it for the one with this vin number [XXX], the first one had a problem with the engine and the offer me to change it for a new one and accept it but since then it has given me problems, at first it was a small pull that felt, then an engine problem, that they "fix" and i have to come back because the " pull " still existed, they fixed it, and after around ... Read more

Incident date: May 1, 2026

The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission independently shifted to park or neutral. The contact stated that the failure had occurred while driving at slow speeds. The contact stated that during one failure, the brakes independently activated, and the vehicle shut off. The contact stated that while attempting to restart ... Read more

Incident date: Aug 28, 2026

My 2022 GMC Sierra 1500 was subject to GM safety recall N242490120 / NHTSA 25V060 for an upper grille deflector that could detach from the vehicle. The recall repair was completed by my GM dealership in June 2025. In late August 2026, while driving normally on the highway, the same upper grille deflector detached again in the exact manner described by the recall. There was no collision, impact, o... Read more

Incident date: Aug 31, 2026

Dropping my children off at school, 4 lights came on on the dash. Two messages came across my dash as well. Service esc service abs. EBCM master cylinder needed to be replaced at local GMC dealership.My brakes were failing…This is a known safety issue by GMC and there’s no recall!

Incident date: Aug 31, 2026

Dropping my children off at school, 4 lights came on on the dash. Two messages came across my dash as well. Service esc service abs. EBCM master cylinder needed to be replaced at local GMC dealership.My brakes were failing…This is a known safety issue by GMC and there’s no recall!

Incident date: Aug 31, 2026

Dropping my children off at school, 4 lights came on on the dash. Two messages came across my dash as well. Service esc service abs. EBCM master cylinder needed to be replaced at local GMC dealership.My brakes were failing…This is a known safety issue by GMC and there’s no recall!

Incident date: Aug 25, 2026

While driving my truck on the highway at 65 mph the truck bucked hard and immediately downshifted into 2nd gear. This caused me to rapidly decelerate to approximately 40 mph, I am lucky there was not another vehicle behind me when this happened since rapid unexpected deceleration without brake lights is very dangerous. I had to drive the truck in limp mode at 45mph and approximately 4500 rpms to t... Read more

Incident date: Aug 25, 2026

While driving my truck on the highway at 65 mph the truck bucked hard and immediately downshifted into 2nd gear. This caused me to rapidly decelerate to approximately 40 mph, I am lucky there was not another vehicle behind me when this happened since rapid unexpected deceleration without brake lights is very dangerous. I had to drive the truck in limp mode at 45mph and approximately 4500 rpms to t... Read more

Incident date: Aug 28, 2026

My 2021 GMC Yukon began experiencing severe engine problems, including shaking/rough running, a noticeable ticking/knocking noise from the engine, and a flashing check-engine light. The vehicle also displayed Service ESC and traction control warnings and exhibited symptoms of an engine misfire. I took the vehicle to a dealership for evaluation. I was advised that the problem may involve failed li... Read more

Incident date: Apr 1, 2026

Lifters failed under 80k miles. Had lifters replaced with gm parts and engine is continuing to eat up oil and lifters are failing again in less than 3 months after the repair. Vehicle was out of warranty and all costs were out of pocket including a rental for over a month bc parts were on backorder

Incident date: Sep 2, 2026

I am reporting a serious safety concern involving a 2023 GMC Sierra 1500 Denali, 6.2L L87 V8, VIN [XXX]. This vehicle has now experienced two catastrophic powertrain failures at very low mileage. The first catastrophic engine failure occurred at approximately 23,696 miles. The vehicle was taken to a GMC dealer, where the repair documentation states that the engine had suffered significant intern... Read more

Incident date: Sep 2, 2026

I am reporting a serious safety concern involving a 2023 GMC Sierra 1500 Denali, 6.2L L87 V8, VIN [XXX]. This vehicle has now experienced two catastrophic powertrain failures at very low mileage. The first catastrophic engine failure occurred at approximately 23,696 miles. The vehicle was taken to a GMC dealer, where the repair documentation states that the engine had suffered significant intern... Read more

Incident date: Mar 15, 2026

Safety Complaint – 2025 GMC Sierra 1500 Tailgate While driving our 2025 GMC Sierra 1500 and towing a trailer, the tailgate unexpectedly opened and dropped down while the vehicle was in motion. No one touched the tailgate button, key fob, or any other controls to activate the tailgate. We were unaware that the tailgate had opened. When we made a turn, the trailer contacted the tailgate and crus... Read more

Incident date: Aug 22, 2026

while driving my 2023 GMC Sierra AT4 at highway speed, the front grille piece (GM part 84957848, roughly 3 feet or longer) detached from the vehicle without warning and flew off into the roadway. The piece landed on the shoulder rather than in a travel lane, but given its size, it could easily have struck another vehicle or caused a serious accident if it had landed differently. I was then forced ... Read more

Incident date: Sep 2, 2026

Fuel pump control module and or the in tank fuel pump failed and or isn’t making proper connection for car to run correctly. Safety was put at risk as car came to abrupt halt while driving. Driver was outside of vehicle at busy intersection for vehicle diagnostics and battery jump. Battery was removed and new battery installed yet problem persists. Not confirmed by dealer but code is as follo... Read more

Incident date: Aug 19, 2026

The piece in front of the hood detached and flew off while riding down the highway.

Incident date: Sep 1, 2026

engine failure

Incident date: Apr 22, 2026

XXX Pulling into Mason Park - Truck Shot down while driving. Went into Park (immediate stop) 2 of my Kids were in the truck at the time. Restarted truck and loud Noises. Immediately backed into parking space shut down and towed. Sent to dealership XXX Called spoke co/ Mark. [XXX] had tech. look at truck. expressed My concerns and Should Never occurred @ 6788 miles. Expressed Something Needs done.... Read more

Incident date: Sep 2, 2026

While driving my 2021 GMC Yukon Denali with the 6.2L L87 V8 on a high-speed highway near Somers Point, New Jersey, the vehicle suddenly began bucking and the accelerator stopped responding normally. The vehicle rapidly lost propulsion while I was surrounded by highway traffic and approaching a bridge. I was fortunate to get the vehicle onto the shoulder before reaching the bridge. I was then stra... Read more

Incident date: May 25, 2025

Driving down [XXX] in [XXX] the engine seized and blew every major electrical fuse. The suv was in the center lane of [XXX] at rush hour unable to be put in neutral and rolled to safety. SUV was towed home then to dealership for confirmation. Engine and all wiring were replaced. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Incident date: May 25, 2025

Driving down [XXX] in [XXX] the engine seized and blew every major electrical fuse. The suv was in the center lane of [XXX] at rush hour unable to be put in neutral and rolled to safety. SUV was towed home then to dealership for confirmation. Engine and all wiring were replaced. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Incident date: Aug 4, 2026

After the initial recall inspection was performed, I was informed that my vehicle was not affected. Subsequently, the vehicle experienced a catastrophic engine failure while traveling westbound on [XXX] near [XXX], approximately one mile from [XXX]. While traveling at highway speed, the vehicle suddenly began losing speed and power. I was positioned between two semi-trucks, creating an extremely ... Read more

Incident date: Jul 6, 2026

Engine stopped working while driving 65 mph on I435 Kansas City. Engine failure had to pull over in 3 lane traffic to get off of roadway. Engine just stopped working. Had towed to GM dealer who performed full engine replacement. 6.2 L . No warning. Just stopped working. Safety traveling on 3 land highway engine stopped with no warning had to work way over the shoulder with no engine.

Incident date: Sep 1, 2026

My vehicle was with ANCIRA GMC Boerne for approximately three weeks where they replaced the transmission control system/module, the centralized OnStar module, and diagnosed both rear screens for replacement. Approximately one month after getting it back, at only 49,800 miles, I experienced a complete loss of propulsion. The vehicle shut down while I was driving. Given the recent transmission re... Read more

Incident date: Sep 1, 2026

My vehicle was with ANCIRA GMC Boerne for approximately three weeks where they replaced the transmission control system/module, the centralized OnStar module, and diagnosed both rear screens for replacement. Approximately one month after getting it back, at only 49,800 miles, I experienced a complete loss of propulsion. The vehicle shut down while I was driving. Given the recent transmission re... Read more

Incident date: Aug 31, 2026

While traveling at highway speeds of approximately 82 mph in a 2026 GMC Yukon Denali (6.2L V8 L87 engine), the engine experienced a sudden, catastrophic internal failure and completely seized without warning. This resulted in an immediate, total loss of motive power, power steering assist, and power braking assist while surrounded by high-speed traffic. The sudden deceleration and lack of vehicle ... Read more

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