GMC Sierra Complaints (2019)

729 consumer complaints on file.

#11730295April 9, 2026
ENGINE
The engine suddenly seized and now needs to be replaced. Regular oil changes, no leaks, and the engine just seized up and won't run. 5.3L V8.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729763April 7, 2026
ENGINE
While accelerating from a stop, the oil pressure warning illuminated. The driver immediately pulled over within approximately 0.15 miles and shut the engine off. Oil was actively leaking from the vehicle. The truck was towed and diagnosed with oil cooler line separation at the crimp fitting, resulting in rapid oil loss and catastrophic engine failure. Sudden oil loss while driving creates a safety hazard. This failure appears consistent with known issues involving oil cooler line assemblies on similar vehicles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729332April 6, 2026
ENGINE
I was driving my vehicle on the highway doing normal highway speed, when I began to hear an odd noise coming from the engine area. I slowed down and moved into the slow lane at which time the noise became worse. The vehicle then lost power and I wasn’t able to get the vehicle to do over 40mph. I was able to exit the highway and limp my vehicle home. I had the vehicle towed to a GMC dealership the following morning. After about ten days, I was contacted by the dealer and was advised that I had an engine failure and that my vehicle required a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729531April 6, 2026
POWER TRAIN
The transmission has a shudder at various speeds.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729002April 3, 2026
SERVICE BRAKES, HYDRAULIC
The contact's partner owns a 2019 GMC Sierra 1500. The contact stated that upon starting the vehicle, the "Service Brake System" and ABS warning lights illuminated. The brake pedal was depressed to the floorboard, and the message that the vehicle would not exceed 62 MPH was displayed. The vehicle was restarted, and several unknown warning lights were illuminated with a message that the vehicle would not accelerate above 42 MPH. The vehicle was taken to a dealer, where a diagnostic test was performed and the diagnostic test revealed that the brake pipe had seized in the brake master cylinder and that the pipe fitting threads were damaged. The contact was informed that the brake master cylinder and the reservoir seal needed to be replaced. Despite the repair, the dealer stated that the master cylinder and brake line fitting were still defective. After several additional repairs to the brake system, the vehicle was returned to the owner. Upon driving the vehicle, the contact stated that the prior brake warning lights returned on the instrument panel. The vehicle was returned to the dealer and remained with the dealer. Upon investigation, the contact discovered NHTSA Campaign Number: 20V055000 (Service Brakes, Hydraulic); and associated the failure with the recall. The manufacturer was notified of the failure, and the contact was informed that the vehicle was not included in the recall. The contact was then given a case number. The contact was also transferred to the NHTSA Hotline to report the failure. The vehicle was not repaired. The failure mileage was 42,320.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11729057April 3, 2026
ENGINE AND ENGINE COOLING, POWER TRAIN
The contact owns a 2019 GMC Sierra 1500. The contact stated that while stopped, there was an abnormally loud sound coming from the vehicle. The vehicle was consuming an excessive amount of engine oil. The engine and transmission warning lights were illuminated. The vehicle was initially taken to the local dealer; however, the dealer was unable to determine the cause of the failure. The vehicle was later diagnosed, and it was determined that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the issue and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 106,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728940April 2, 2026
ENGINE
My vehicle is at the dealership now - it wasn’t starting properly, started always getting low on oil which I took to the dealership for them to monitor- and then the check engine light came on- once that came on just last Thursday I did not drive the vehicle except to the dealership to be inspected - which my appt was Monday and they found metal shavings in the oil and said the whole engine needs replacement!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728443April 1, 2026
ELECTRICAL SYSTEM, ENGINE
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle lost automotive power; however, the vehicle maintained electrical power. The check engine warning light was illuminated. The vehicle was towed to a local service center, where it was diagnosed and determined that the battery needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the same local dealer and remained for additional investigation. The contact attempted to restart the vehicle several times and shift into different gears; however, the failure reoccurred. The local dealer was contacted, but 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 103,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728086March 30, 2026
POWER TRAIN
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle vibrated and felt as if the transmission was going to unexpectedly downshift. No warning light was illuminated. In addition, there was an abnormal sound coming from the rear wheels. The contact stated that it felt like the rear tires were driving in the wrong gear. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The contact stated that the failure persisted and became a worsening failure. The manufacturer was not notified of the failure. The failure mileage was approximately 75,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11728087March 30, 2026
ENGINE
Engine knocking, constantly kicking into limp mode, shaking when driving. Taken to GMC and local repair shops. Limp mode will not stop kicking on. Now other issues will mean total engine replacement needed. Mechanic says it’s not worth repairing at this point. Only 109k miles on it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727753March 29, 2026
POWER TRAIN
Transmission shudder and vibration at highway speed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11727566March 27, 2026
ELECTRICAL SYSTEM
THE PARK ASSIST WOULD GO ON WHEN I WAS AT A STOP LIGHT AND NO ONE WAS IN FRONT OF ME AND AUTO STOP WAS OFF ALL THE TIME. TWO GROUND STRAPS WERE CORRODED. THERE IS A RECALL ON THEM FROM 2019 TO 2024. MY TRUCK DID NOT HAVE A RECALL ON IT. I JUST WANT TO LET YOU KNOW AND MAYBE IF ENOUGH PEOPLE COMPLAIN, YOU WILL PUT ALL TRUCKS ON THE RECALL.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11726779March 24, 2026
POWER TRAIN
The transmission valve body was trying to lock up while driving and making it shimmy and shift hard. I took it to Davis GMC in [XXX] . They diagnosed it with the transmission malfunction (this is the same transmission that is under recall in the 2020 models)j. I paid $8660.33 to have them replace the transmission. It has been approximately 6 months and 6.000 miles and now this transmission is shuttering, also. I took it back to Davis GMC and the technician told me that I didn't know how to drive a 10 speed automatic! I then took it to TriLakes Motor in [XXX] where they made an adjustment on it. That has not fixed the problem. Today I contacted the main GMC center and started a case number: XXX. They suggessted taking it back to a dealership again and trying to get it fixed again. I feel like I am stuck with a truck that can not be fixed and should be in the recall due to it having the same transmission as the other GMC Sierra's that are under recall. 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
#11726192March 22, 2026
ENGINE
Lifter failure and camshaft failure twice
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725848March 20, 2026
ENGINE
My Truck Was 123369 Milles Was Driving And Stop At My Work Turn Off The Vehicle and After That Re-Start The Vehicle And The Vehicle Not Start The Check Engine Light Coming on Im Tow The Tuck To The Dealer Were I Do All My Service They Check The Truck After A Mont And They Told Me The Engine Timing Off Due To Camshaft Gear Spun On Camshaf Which Sheared Locator Pin Valve Timing Off So That Enging Does Not Build Compression In Any Cylinder Recommende Enging Replacement Due To Nature Of Failure-Extensive Mechanical Damge Internaly To The Camshatf And The Warranty Was Over
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725101March 17, 2026
ENGINE
dangerous lost of propulsion in traffic while my minor daughter was in the vehicle, I was driving my truck that has a 6.2 Engine gmc that is currently being reviewed Engineering Analysis EA25-007, I bought engine back in October 2025 and incident happen Early March 2026 Around 10,000 miles
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11725116March 17, 2026
ENGINE
This truck is equipped with the 6.2L L87 and the motor seized up and shut off with no dash light warning and i stalled and rolled over a curb! This is very dangerous and now i have to pay 10k + out of Pocket for an engine replacement! Truck has low miles this is unacceptable and it needs to be in the recall , this is dangerous and it hurts people !
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11724775March 16, 2026
ENGINE, UNKNOWN OR OTHER
I was driving in a city at 30 miles per hour no acceleration and no load. I lost oil pressure, dumped all the oil out of the crankcase and then the engine locked up. I had it towed to my mechanic shop that i have work done. The technician diagnosed it as a failed oil cooler pressure supply line. Where the solid steel line crimps to a rubber oil hose, that connection had not been applied enough pressure and the rubber line became separated from the steel line.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724048March 13, 2026
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
While driving down the highway experienced a partial loss of engine power causing jerky/rough operation, harsh shifting, and unpredictable behavior. Was told by the dealer service manager that it was likely a misfire in one of the cylinders. After diagnostics and servicing that included changing spark plugs, wires, and a full engine service it was later confirmed to most likely be due to a stuck lifter and will require a complete engine replacement. I have subsequently learned that this is a common problem with this L87 engine and may be an early indicator of failing crank bearings associated with a recall for later model years of my same vehicle. Seems to me that recall ought to be expanded to include earlier models with L87 engines.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11724160March 13, 2026
ELECTRICAL SYSTEM
UI Bulletin #161b is for years 2020 and beyond. But my 2019 is having the same exact issue and the GM dealer will not cover the work as stated in the UI Bulletin #161b
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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