GMC Sierra Complaints (2019)

729 consumer complaints on file.

#11748492July 6, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2019 GMC Sierra 1500. The contact stated while driving at 55 MPH, the vehicle made an abnormal rumbling sound and stalled. All the warning lights illuminated. The vehicle was taken to a nearby independent mechanic, who determined that the engine lifter and cylinder had failed. The vehicle was not repaired. The local dealer was not contacted. The manufacturer was contacted and confirmed that there was no recall coverage. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 98,003.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11747528June 30, 2026
ENGINE, FUEL/PROPULSION SYSTEM
Lifters (the part that opens and closes engine valves) fail prematurely. There was a loud ticking noises, rough idling. Took to dealership and they advise that yes the lifters are failing and not drivable at this time.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11746005June 23, 2026
EXTERIOR LIGHTING, ENGINE, ELECTRICAL SYSTEM
I am retired and have always bought GM vehicles which are taken care of with required oil changes etc. This one I have only owned 25,000 mi each year (I have owned two years). So, when purchased it has high 50,000 miles not sure of exact, and it has only been driven 2 years. When calling escalation at GM, they act as though it doesn't matter and too bad. 110,000 miles and the truck needs a new motor. This is what we are told and 10,000 more than the initial 1500 to tear it down. This truck is not broken due to us, this is a problem with the manufacturer and the responsibility needs to be addressed. My husband has a heart issue and he almost didn't make it home. I'm not accepting that nothing be done, since next we need a lawyer and a media appointment. This isn't right when you see thousands of people with the same GMC Sierra trucks online with complaints of the same valve and motor issues. This needs completely replaced and not by a customer, by the manufacturer. How can 1500 people new wrong on one sight stating the same as we have had. This person who is responsble for reporting and making sure we are safe needs to be fired. I am writing my representatives, senators etc to let them know this is going on. No one should pay for the mistakes of bad engineering. PERIOD.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11746054June 23, 2026
ENGINE
No warning lights, engine stalled in the middle of the freeway almost got killed by a semi truck was behind me, engine lost power and found that needed new engine because of the camshaft and internal damage.confirmed by certified mechanic
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745543June 22, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving 75 MPH, the message "Engine Power Reduced" was displayed and the vehicle decelerated and stalled. The vehicle was pulled over onto the shoulder and failed to restart. Roadside Assistance was called to the scene, and the vehicle was towed to the local service center, diagnosed, and it was determined that the engine Cam Actuator screws had failed causing metal shavings to enter the engine and turbo. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer and local dealer were notified of the failure. The failure mileage was 95,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744883June 17, 2026
ENGINE
On [XXX], my 2019 GMC Sierra 1500 Denali equipped with the 6.2L engine suffered a sudden loss of power while driving. The vehicle lost propulsion and could not continue operating normally. The vehicle was taken to Orange Buick GMC in Orlando, Florida. The dealership advised that the engine is locked and unable to rotate manually, and that the engine requires replacement. The vehicle has approximately 126,000 miles. This failure occurred while the vehicle was being driven and created a safety concern due to sudden loss of propulsion. A sudden engine lockup or loss of power could increase the risk of a crash, especially if it occurs in traffic, at highway speed, while turning, or while crossing an intersection. There was no crash, fire, injury, or death. The vehicle remains at the dealership awaiting repair. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744534June 16, 2026
ENGINE
Engine fail due to lifters collapsing, had a really bad lifter on #3 and #2 and cause to chew out camshaft . Needed a new engine and gm didnt wanna honor it warranty only partial .
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743480June 11, 2026
ENGINE
On May 27, 2026, I was on my way home from work when I went to accelerate the vehicle and all the sudden it started shaking and the check engine light came on with the EBS. I was able to get the vehicle to a repair shop local the next day, who took the car apart. What was thought to be an easy fix of spark plugs and fuel injector, became even more after they put back together and the cylinder was still misfiring. After several hours of taking apart the engine, the mechanic determined that the hydraulic valve lifters had failed. This has been an ongoing issue with with the 5.8L V8. Due to a recall not being under the vin yet, i have now incured a $16k expense to add an engine to it after i purchased it in Nov of 25 at $97,000. This is a saftey issue and luckily no one was hurt when the car started shaking and couldn't go over a certain speed. I want this reviewed and looked at for possible reimbursement as there have been several other vehicles with the same known issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743324June 10, 2026
ENGINE
I was driving, suddenly my truck is dead. I got it tow to GM dealership for weeks. The technician diagnose and said I need a new engine replacement. My truck is only 148K.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11743062June 9, 2026
ENGINE
While towing Jetski's the #2 Cylinder has a persistent misfire. Was able to limp to Chapman Chevrolet where it took 2 days to diagnose. Vehicle is below 70K, which just recieved a brand new transmission and torque converter due to metal shavings from converter getting pushed through to the transmission. Service Advisor's Message below: "Performed further diagnosis and requested engine teardown to determine root cause of misfire. During disassembly, found cylinder #2 intake/exhaust valve train failure, including a bent pushrod and a severely scored/collapsed lifter. Inspection revealed the damaged lifter had caused abnormal contact with the camshaft lobe, resulting in significant scoring and wear of the camshaft. The failed lifter and bent pushrod led to loss of proper valve operation and cylinder misfire. Point of failure is lifter #2 that resulted in camshaft failure as consequence. I am in the process of generating a quote and taking pictures for the extended warranty." Seems like another AFM/DFM issue has brought down another GM Motor. Why are these motors not part of the recall, when they are going down the same was as the recall? My safety and my family were put at risk for a possible catastrophic failure and loss of power due to the engine being faulty. There were no warning laps, just Check engine Light, Parking Break Wrench Light. The only other sign was a quite tick that is with most Chevy/GM Motors.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11742729June 8, 2026
ENGINE
Vehicle lost power and shut down while driving at 60 mph, would not restart
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741983June 4, 2026
VEHICLE SPEED CONTROL, POWER TRAIN, UNKNOWN OR OTHER
Transmission blew on a 7 year old vehicle. Was replaced entirely and is NOW having the EXACT SAME PROBLEM AGAIN!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741465June 2, 2026
EXTERIOR LIGHTING, ELECTRICAL SYSTEM
The contact owns a 2019 GMC Sierra 1500. The contact stated that the trailer lights flashed intermittently while the vehicle is turned off. Additionally, the contact stated while driving with a trailer hitched to the vehicle, the messages "Trailer Disconnected" and "Trailer Connected" were intermittently displayed, and the running and marking lights were inoperative. The contact related the failure to GM TSB Numbers: 20-NA-198 (Trailer Running Lights Shut Off Due to Excessive Load on the Running Lamp Circuit), PIT5747B (Diagnostic Tip - Trailer Lighting Complaints with Trailering App RPO U1D) and N192213550 (Service UpdateTrailer Integration Module Software Error). The vehicle was taken to an independent mechanic, where it was determined that the failures were due to a wiring or software failure. The contact was informed that the failure was a factory defect because the fuses were in good condition. The vehicle was not repaired. The dealer and the manufacturer were not contacted yet. The failure mileage was approximately 64,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11741022May 30, 2026
UNKNOWN OR OTHER
Back window water leaking causing bad smell and mod
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740464May 27, 2026
ENGINE, POWER TRAIN, FUEL/PROPULSION SYSTEM
While driving, the vehicle suddenly began running rough, losing power, and displaying engine warning lights. Due to the severity of the issue, the vehicle was towed to a GMC dealership for diagnosis. The dealership diagnosed lifter failure and a cracked cylinder head. The dealership also documented coolant intrusion, oil/coolant contamination, and evidence of internal engine damage. Repairs were attempted, including replacement of the cylinder head and lifter. After the repairs were completed, the vehicle never left the dealership because it continued misfiring on the same cylinder. GM later determined the engine had a failed piston ring and scored engine block requiring complete engine replacement. The vehicle has approximately 55,000 miles, has been properly maintained, and was purchased new. This catastrophic engine failure resulted in loss of power and major internal engine damage at relatively low mileage. I also opened a case directly with GM Customer Assistance regarding this failure. The case involved multiple escalations after the initial repair attempt failed and the vehicle ultimately required full engine replacement. GM ultimately advised that only partial assistance toward the engine replacement would be provided, leaving the customer responsible for a significant portion of the repair cost. I am submitting this complaint because this vehicle appears consistent with the ongoing NHTSA investigation involving GM 6.2L L87 engine failures and loss of motive power.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11740370May 27, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2019 GMC Sierra LD 1500. The contact stated that while driving approximately 65 mph, the vehicle, went into low power mode, and was able to move safely to a and then the vehicle stalled. The vehicle was towed to an independent mechanic and was diagnosed as the engine has no compression, suspect a possible crankshaft failure, also a possible engine replacement. The manufacturer was notified of of the failure. The contact associated the failure with NHTSA Campaign Number 25V274000 (Engine and Engine Cooling). The approximate failure mileage was 130,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739273May 21, 2026
ENGINE
Engine component failure. If not identified early could have caused catastrophic failure being disabled in traffic. This problem has been diagnosed and confirmed by a certified GM dealership. Initial warning sign was a knock in the engine, no warning lamps. First identified on 9/2/25 at 80,345 miles. Dealership changed oil to a higher viscosity. Problem gradually got worse, diagnosed #3 cam lobe failed 3/9/26 at 85,437 miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739399May 21, 2026
ENGINE
After the vehicle was purchased in October 2023, it immediately had an issue shifting very hard. After numerous trips to the servicing dealership in attempts for error codes to be discovered with no success, the dealership gave the recommendation to flush the transmission as this was a fix for this type of engine in November 2024. The transmission was completely flushed in November 2024. The vehicle continued to have the issue with hard shifting and also developed less efficient gas mileage and would misfire upon ignition and there was a constant knock when running. After a prominent ticking began in May 2026, it was discovered that the timing chain was broken and we were told the rods could impale the engine and go through the hood if the engine was not replaced. The engine had completely failed and needed to be replaced including radiator and hoses. The engine, radiator, and hoses were replaced 05/2026. The invoices for both of these Service transactions are attached. After much research and advice, it appears this issue was the same issue that was happening with the other 6.2L L87 engines from the years 2021 to 2024 that were recalled.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11738515May 18, 2026
ENGINE
I was driving my 2019 GMC and all of a sudden I pulled into a subdivision the vehicle shut off and would not start again. I wasn't given an y warning or heard any sounds it shut off and would not start up again. I checked the battery and it was fine. I had it towed to a mechanic shop. They replaced the starter, and the battery module. after that they ran codes and the codes were P00C6 and P0340. I had it towed the the local chevrolet dealership and they told me I needed to have the engine replaced, however they don't have any engines available or know when they would be able to get one.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11737475May 12, 2026
ENGINE, FUEL/PROPULSION SYSTEM
I was on my way home from work and everything was driving fine and then I got 1/4 mile from my house and the motor started making a very loud grinding sound. I could barely accelerate. The issue happened out of nowhere. No issues prior to this happening. I was driving about 40 miles an hour when the issue started and I limped it to my driveway, luckily I was not very far away. I have a 3 month old baby and this was my reliable family vehicle. Who’s to say what could have happened if I was driving at a higher speed with my child in the car. When it happened it started shaking really bad. I checked everything that I could. It sounded like my motor was starving for oil. I decided to go ahead and change my oil to see if that could have been the issue. I had just changed the oil approximately 2000 miles before this. I changed the oil and filter. Went to start it up and still same very loud grinding sound, shut it back off and have not started it since cause I’m afraid to damage it further. I checked the oil that I drained out of it and looks like small metal flakes in the oil. No warning prior to this happening. Just out of no where it sounds and felt like my motor was going to blow.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

← Back to GMC Sierra