GMC Sierra Complaints (2023)

567 consumer complaints on file.

#11744918June 18, 2026
ENGINE, FUEL/PROPULSION SYSTEM
1. The L87 Engine Loss of Propulsion failed and is available for inspection at the service department at Power Swain Chevrolet dealership, Fayetteville, NC. 2. I, other vehicles, cyclists, and pedestrians were at risk. That vehicle could have come down on the highway, causing a vehicle pileup, which could have caused mass casualties. 3. The problem is known; the service advisor informed me the vehicle's engine needed to be replaced. 4. There were absolutely zero warning lamps or My GMC app alerts to announce vehicle issues. I have attached the last two maintenance records I have on hand. I suspect the dealership will try to deny responsibility for repairs. An extended warranty most nearly means we expect it to break down and your safety is not our concern.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744192June 15, 2026
ENGINE
Truck starting bottom end knocking noise at 57,700 miles. Engine had the recall done to it for Pico test and passed. Dealership states now it will need a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743955June 14, 2026
STRUCTURE:BODY
It was the Chrome Grille Deflector and is available for inspection. I was driving down a long road at roughly 50 mph when all of a sudden the grille deflector detaches from my bumper and hits my windshield causing me to swerve thinking I had hit something. I was almost in an accident. I believe there is a recall for this exact thing but only for 2022 models not 2023. No it has not been inspected I tried to call GM to get guidance and see if it could possibly be covered seeing as it is a manufacture error but was denied. One small piece that has been recalled on other vehicles but mine is causing me to almost pay $900 dollars. I have yet to replace the part
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744025June 14, 2026
UNKNOWN OR OTHER
While driving down the highway at night my front grill deflector broke off hitting my windshield and flying into the road. Thankfully there was no one behind me but it scared me quite a bit and could have caused me or someone else to crash
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743860June 13, 2026
STRUCTURE:BODY
As I was driving down the highway the hood front molding flew off and took a chunck of paint off my GMC 2023 AT4, hitting a elderly ladies windshield we pulled over there was no damage to her car thankfully, she was very shakin and gave me an ear full. I have reached out to GMC even took it in and left it overnight and they say it is not under the recall and it will cost $1200.00 to fix. We currently own 3 GMC's, this one is mine (a woman) and she is my baby. I do not think it is fair that my truck matches the exactly damage you see on the trucks on the recall list, a service man also told me that they replaced one of them that was recalled and shortly after it to broke and flew off. If there is anything someone can do help, I know I am not the only one this is happening too. Thank you J
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743475June 11, 2026
STRUCTURE:BODY, ELECTRICAL SYSTEM, VISIBILITY/WIPER
The plastic upper rail glass guide frame on the rear sliding window assembly of my 2023 GMC Sierra developed structural micro-cracks during normal vehicle operation. This manufacturing defect is a known issue tracked internally by the manufacturer under Technical Service Bulletin (TSB) #18-NA-383.This structural failure allows severe water intrusion into the passenger cabin. The leaking water runs straight down the inside back wall of the cab, completely flooding and corroding sensitive, factory-installed electronic safety modules mounted directly beneath the leak path.This continuous water intrusion caused the catastrophic electrical failure and corrosion of the video processing control module located behind the rear seat. The sudden failure of this module completely disabled the rearview digital mirror camera and the 360-degree perimeter driver assistance cameras, creating immediate blind spots and an active driving safety hazard while operating the vehicle.The vehicle was inspected and repaired by an authorized dealership, confirming the rear window leak as the direct cause of the electronic destruction. The out-of-pocket cost to replace the water-damaged safety components was $2,747.00. Because the manufacturer refused to cover the replacement of the defective rear glass assembly, the structural leak remains unresolved. This active water intrusion continues to flood the cabin, creating a health hazard via mold growth and guaranteeing that the newly replaced safety cameras will inevitably short-circuit and fail again.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742955June 9, 2026
POWER TRAIN
the vehicle is actively presenting severe mechanical symptoms that make it entirely unsafe to operate on public roads. Specifically, it exhibits a violent shuddering and vibration through the cabin when coasting or cruising at highway speeds. Furthermore, it undergoes aggressive jerking, harsh engagement, and dangerous hesitation the moment I press the gas pedal to accelerate or merge.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742795June 8, 2026
ENGINE
The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving at 15 MPH, the vehicle stalled. There was no warning light illuminated. The vehicle was towed to the dealer, where it was serviced, but the failure persisted. The vehicle was taken to another dealer, where it was diagnosed with engine failure. No further information was available. The manufacturer was not made aware of the failure. The failure mileage was approximately 103,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742551June 7, 2026
POWER TRAIN
The transmission control module failed. The dealer said a I a high voltage alarm signal code. This was the diagnostic inform received from the dealership service department. Primary]: MDIAG : MISC. VEHICLE DIAGNOSIS. CHECK ENGINE LIGHT ILLUMINATED AND GETTING MESSAGE FOR SERVICE TRANSMISSION, UNABLE TO SHIFT. PLEASE CHECK AND ADVISE * Repair items per diagnosis: FOUND P07B4 STORED IN SYSTEM. VERIFIED WIRING OK TO GEAR SHIFT CONTROL MODULE. SI STATES IF WIRING GOOD TO REPLACE GEAR SHIFT CONTROL MODULE AND IF CODE RESETS TO REPLACE ECM. RECOMMEND STARTING BY REPLACING GEAR SHIFT CONTROL MODULE The truck would not shift or go into gear at all. This was concerning because the transmission could have stopped shifting while I was driving myself and my children around. This warning light came on while I was driving on the highway. My vehicle has about 58,000 miles on it and is still under powertrain warranty. But the dealership is saying this repair isn’t included.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741918June 3, 2026
VEHICLE SPEED CONTROL, POWER TRAIN
The truck side toy down shift and the accelerator was very high…. When I was going to park the reverse was not shifting…
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741318June 1, 2026
POWER TRAIN
Upon accelerating on the freeway, rear wheels locked up completely almost causing me to hit multiple vehicles. Was repeatable and was able to record the event. Manufacturer claims unable to reproduce and bring back if it happens again. No lights were set.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741004May 30, 2026
POWER TRAIN, ELECTRICAL SYSTEM, ENGINE
Model: Sierra Denali Ultimate Engine: 6.2L V8 VIN: [XXX] Mileage at Most Recent Incident: Approximately 52,000 miles Safety Complaint Summary I am submitting this complaint to report a recurring loss-of-propulsion and engine power event involving my 2023 GMC Sierra Denali Ultimate equipped with the 6.2L V8 engine. This vehicle has experienced two separate incidents in which it suddenly lost power while being operated at highway speeds. During both events, the vehicle unexpectedly lost propulsion without warning and without any apparent driver input or mechanical indication beforehand. No warning lights, check-engine lights, reduced-engine-power messages, service transmission messages, or other warning indicators were displayed prior to the failure. The vehicle simply lost power while traveling in traffic. During both occurrences, I was forced to safely maneuver the vehicle to the shoulder of the roadway while rapidly losing speed among surrounding traffic. Once stopped, the vehicle would not resume normal operation until it was restarted. After restarting, the vehicle appeared to operate normally; however, the fact that this condition has now occurred twice raises significant concerns regarding the reliability and safety of the vehicle. Safety Risk This condition presents a significant and immediate safety risk because sudden loss of propulsion during highway operation can leave the driver unable to maintain speed, safely merge, maneuver, or avoid surrounding traffic. The unexpected reduction in speed creates the potential for rear-end collisions, loss of vehicle control, or other traffic accidents, particularly when operating on high-speed roadways. Because the vehicle provided no warning before losing power, there is little opportunity for a driver to take preventive action. Additional Information • Vehicle: 2023 GMC Sierra Denali Ultimate • Engine: 6.2L V8 • VIN: [XXX] • Approximate Mileage: 52,000 miles • Number of Incident INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 55
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740911May 29, 2026
ENGINE
The lifters on my 2023 GMC Sierra failed and damaged my engine. The truck has approx 78,000 miles. I do have an extended warranty to 100,000 miles. I got the truck to my GMC Dealer who confirmed the problem was lifter failure. There might be camshaft damage but will have to tear the engine down. It seems like GMC is dragging there feet. It is known the lifters are a problem on this engine but GMC continues to sell them. There was no warning that the lifters would fail. The lifters could have failed while driving at high speeds and the driver could loss control.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740519May 28, 2026
ENGINE, FUEL/PROPULSION SYSTEM, VEHICLE SPEED CONTROL
After driving my vehicle for a short period of time I stopped to go shopping. When I returned to my vehicle I started it as usual and the check engine light illuminated. I began driving and within 0.25 miles I received an info enter message that stated my vehicle would have reduced acceleration and to please drive safely. My engine fans became noticeably louder and ran the entire trip home (about 15 minutes). After pulling into my driveway I sat in the vehicle and listen to the fans continue to operate. Additionally, my OnStar system, WiFi, and navigation systems quit working. A P1098 Code was returned when using a diagnostic code device. Disconnecting the battery would cause the check engine light to extinguish and for the truck to operate without reduced acceleration; however, OnStar, navigation and WiFi would not work. After shutting off the engine and then restarting the check engine light would once again illuminate and the reduced acceleration message reappeared.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739478May 22, 2026
STRUCTURE:BODY
Driving down the interstate and the front trim bezel on the hood flew off. The plastic clips broke from underneath. GM had a recall on this same issue in 2022 but not 2023 yet. Could of had an accident with the piece flying off at interstate speeds.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739316May 21, 2026
ENGINE
This vehicle has experienced repeated catastrophic engine and drivability failures since purchase and has now undergone four engine replacements under warranty. Despite these major repairs, the vehicle continues to experience dangerous shutdown/stalling conditions. The primary safety issue occurs while braking or coming to a stop. The engine will suddenly shut off unexpectedly, creating a serious traffic hazard and leaving the vehicle unable or difficult to restart. This has occurred multiple times and creates a dangerous situation in traffic and at intersections. The vehicle remains under manufacturer warranty, however the defect has not been successfully repaired despite extensive service attempts and multiple complete engine replacements. The condition substantially impairs the safety, reliability, and use of the vehicle. This vehicle was acquired through a fleet/lease arrangement for company use and was not purchased for resale. It is a light-duty 1500-series pickup with approximately 7,100–7,200 GVWR used as a company vehicle. Complete repair history, diagnostic records, warranty repairs, and engine replacement documentation can be obtained from: Stevens GMC Bristol, Connecticut The vehicle has been repeatedly presented for repair and the defect remains unresolved. This appears to be a serious ongoing safety-related defect involving engine shutdown/stalling while braking or stopping.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739416May 21, 2026
ENGINE
On May 13. 2026 traveling southbound on I15 Utah at 75 MPH the engine Stop and put the tranmisson in N and I move the truck to a stop. then the Truck shut Down. I had the Truck tow to the nearest GMC and was informed that the Engine had sezed. I had recalled done to pervent engine failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737984May 15, 2026
ENGINE, POWER TRAIN, WHEELS
While out of Town driving back home Wheel lock up on my 3500hd dually 2023 gmc .. vehicle had shudder effect and from 75 to 25 mph drasticly and engine reduced power light came on and wouldn’t come out of drive and then after stopping vehicle To cement parking safety block the vehicle had multiple codes for valve body and transmission failure relating to the na242454441 issue on previous year models and gmc is not working properly on a resolution but admitting that it is having the exact issue of previous models and with this issue I was promised for full replacement at no cost I am currently working with executive team to help fix the issue that the dealership in Levelland Texas is not honest about what codes are within parameters when infact have A dtc code reader and was able to get a photo and have history of code showing etc
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11737731May 14, 2026
ENGINE
catastrophic internal engine failure on my 6.2L engine. Several times vehicle was to Gm Gunn Buick GMC regarding power loss knocking noises. Received the run around that vehicle past all their initial inspection and test. They only replaced a VALVE LIFTER REPLACEMENTS BANK 2 without further assessment of the engine or components. I took my vehicle to another shop to conduct a thorough inspection and they found broken metal from the piston/skirt and likely connecting rod damage inside the crankcase. Broken piston skirt/piston material • Cylinder wall damage/scoring • Metal debris throughout lower end • Possible bent/broken connecting rod • Potential crankshaft/journal damage from debris circulation • Oil pickup area contaminated with metal Lifter failure leading to dropped valve/ piston contact • Rod bearing failure • Oil starvation • Spun bearing • Piston failure/detonation Advised GM Gunn Buick and GMC of the secondary engine inspection by another shop. Manager told me it was my issue now and they wouldn’t replace my engine it wasn’t there problem. I had to pay out of pocket for a new engine replacement due to the negligence of GM and their agency lack of maintenance and customer care and service
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11736546May 8, 2026
WHEELS, ENGINE, POWER TRAIN
I have had an incident where my 2023 gmc 3500 hd was had left me stranded earler this week. i towed the new truck to a certified dealer and i haven't heard anything since then. they mentioned my transmission will need to be fully replaced because valve body issues of solenoid a,e,f, are stuck open and closed codes on the 10 speed transmission upon researching my trucks history it was manufactured in 2022 and pulled out for sale october 2022 and i have seen. 242454441 special recall the same issues i experienced shudder and engine power reduced and no parking gear or driving. i need help and didnt have any warning of anything about this till now since it was showing my vehicle only had a tailgate issue which gmc didnt help me out when i had to pay for my taillight after firewood flew out with the tailgate opening in jan 2023 they said it wasnt a known issue then fixed the tailgate but not the taillight so i need help proving my truck belongs with the 242454441 class of recalls because not only does the transmission the exact same as previous models obviously 1000s of others are getting this issue thank you
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0

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