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.

- Mcpherson , KS, USA

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.

- Spangle, WA, USA

Driving down the Interstate 35 in Tarrant County, Texas. Engine locked up. Towed to dealership. Dealership determined that engine is locked up. Had dealership verify oil level was okay and they confirmed that it was. Oil had been services two weeks ago. Engine is a 6.2 L but not the L87 block. Milage on the vehicle is 149,752.

- Whitehouse, TX, USA

Engine shut off while driving and steering wheel wouldn-??t let me turn and I drove up on a curb into someone-??s yard, There should be a recall on these trucks with the 6.2L in the year 2019, this is very dangerous I could of injured myself on injured someone else. This needs to be addressed!!

- Muskegon, MI, USA

The 2019 GMC Sierra AT4 with the 6.2L V8 engine began making a rattling or tapping noise at 45 mph. No warning lights appeared on the dashboard. When starting the engine and idling, a similar noise can be heard from the engine. I bought the vehicle used from a dealership one month ago, with 80,000 miles, and the second issue is the complete failure of the blind spot warning system on both mirrors. It was a one-owner vehicle with a clean Carfax. I am scheduled to take the vehicle to the dealership's service department for a full inspection.

- Tulsa, OK, USA

Engine oil pump solenoid. Diagnostic code P06DD.

- Baltic, SD, USA

The oil cooler line is leaking, and the vehicle is available for inspection upon request. This safety concern is addressed under GM Program N192220080. The Hazard is Present: The leak is active. The risk of total line detachment and engine seizure is the same in Texas as it is in Alaska (the US state the GMC recalled the exact same part). An engine seizure and loss of propulsion is an immediate danger to passengers within the effected vehicle, as well as the other vehicles on the road. The Admission of Defect: GM-??s offer to provide the part (Part #85136335) confirms that my vehicle-??s hardware is part of the failed batch. The vehicle was inspected by an authorized GMC dealership on 01/14/2026, confirming the leak and potential safety hazard with continued driving of the vehicle. The issue was submitted to the GM Customer Care team, Case #[XXX]. The only warning of the defective oil cooler line leak was oil on the ground underneath the vehicle after driving. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Frisco, TX, USA

Engine light came on, along with 'Service ESC' and 'Service Parking Brake' I drove it to my local GMC and it continued smoking and they told me that if I drove it like that it could blow up the engine. They mentioned a recall on these types of trucks but they said the warranty on my vehicle had expired at 60000 miles. Yes, I took it to Rogers GMC in Hermiston and the diagnostic is, "Mechanical: Valve Lifters - Remove and Replace" Totaling repairs to about $7000 Before this nothing was wrong, I drove it to work everyday and one evening when I turned it on the dashboard lit up and it started smoking.

- Umatilla, OR, USA

While driving my 2019 GMC Sierra with approximately 119,000 miles the engine suddenly made a loud bang, started shaking violently, backfiring, and missing out. Took it to dealer. They diagnosed the problem as a rod failure with camshaft damage. Quoted repair cost $12,000. After repair, they were doing a 25 mile test drive before returning the truck to me. After only 20 miles, the engine completely failed. Now it needs an entire new engine. I am waiting for them to reply what the cost is. The truck was maintained exactly as required in the owners manual at General Motors dealers

- Naples , FL, USA

On Wednesday, January 7th, 2026, my wife and I were traveling North on the Northeast Extension of the Pennsylvania Turnpike (476) at approximately 9:00 pm. A check engine light came on with no other symptoms, we start to get off the next exit. While still on the highway, the motor turns off with a warning to put it in neutral and restart. It would not restart and coasted off the exit and into a convenience store parking lot. There was noise, just turned off. We got stuck in the town for over 2 days before getting a tow 209 miles to the mechanic shop. We were miles from any mechanic shop and tried to troubleshoot while waiting and to no avail. First mechanic had to send it to a second because it looked like the engine had seized and that was confirmed at the second mechanic shop. Apparently the bearings in the lower end seized. The only thing they could offer was to replace the motor. It had proper amounts of fluids and didn't overheat. The motor replacement is approximately $10,800 in addition to having no vehicle there was additional towing and breakdown expenses (food and lodging for 2 nights and 3 days)

- Heislerville, NJ, USA

The DFM program in the engine caused the lifters to fail and bend a pushrod which in turn scared the cam shaft. There were no signs leading up to this. It caused the traction control and brake systems to be compromised. I took vehicle into a gm dealer and had it diagnosed.

- Bernie, MO, USA

Engine loss of power many different engine code took it to the dealership. Now they say lifters, rockers are loose and worn, broken, the cylinder 5 misfire, engine needs rebuild at 88,000 miles. Dealer wants over ten thousand dollars to take apart and repair

- Prospect, CT, USA

For the past month I have noticed my truck has been dripping oil, I pulled the shield off and saw my engine oil cooler lines leaking at the crimp points. I-??ve seen GM put out customer satisfaction notice but when I tried to have the dealership fix mine they said mine is covered under any recall or warranty. If the line comes uncrimped at highway speeds I-??ll lose all my oil where the trucks engine could lock up and lose all forward motion and in my eyes could cause a crash

- Fort Dodge, IA, USA

The contact owns a 2019 GMC Sierra 1500. The contact stated that the vehicle made an abnormal rattling sound while idling. Additionally, while driving at 45 MPH, the message "Reduced Power" was displayed, the check engine warning light illuminated, and the vehicle stalled. The contact was able to coast to the shoulder of the roadway. The vehicle failed to restart and was towed to the dealer, where it was diagnosed and determined that there was no compression in the engine. The dealer determined that the engine needed to be replaced. The dealer advised the contact that the repair was not covered because the VIN was not under recall. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 126,000.

- Detroit, MI, USA

After a really bad cold snap noticed oil spots on my driveway, after further inspection noticed the oil cooler lines were leaking from the crimps. Got in contact with GM because there was a customer satisfaction program for my year model- N212326940- they told me it did not apply to my truck but it is a know issue, and now I-??m having to come out of pocket for it.

- Taft, TN, USA

Catastrophic engine failure. Engine failed while driving and lost all oil pressure. Nearly cause accident

- Warren, NJ, USA

While pulling a small trailer to go hunting, the engine just lost all power while merging onto the freeway. I had to pull over to the shoulder in high speed traffic because the truck had no power and had an odd clanking sound. When I took it to the dealer for repair, they stated that the lifter failed and also damaged the cam. This required a full engine rebuild. When the dealer went to test drive the truck with the new parts, ANOTHER lifter failed and also affected the cam again which required another rebuild.

- Clinton, UT, USA

On January 15, 2026, my wife was driving our 2019 GMC 1500 Sierra Denali and the lights on the dash came on with the truck losing power. I made to my wife later in the day and was able to drive the truck to the dealership only achieving 15mph for about 5 miles. The Mike Bell Chevrolet Dealership in Carrolton GA stated that my engine was knocking and needed to be replaced. I took my truck the John Thornton Buick GMC dealership on January 22 to get a second opinion and they stated the exact same thing stating the engine needs to be replaced. The dealership is stating the remanufactured replacement issue is over $10,900. My truck has over 271,000 miles.

- Douglasville, GA, USA

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, the braking system had erroneously activated, causing the vehicle to abruptly stop in the middle of the road. The vehicle was towed to the local dealer, who diagnosed that the failure was caused by an engine malfunction of the number six cylinder. The vehicle was repaired. No further information was available. After retrieving the vehicle, the contact was driving approximately 10 MPH when the failure reoccurred and the braking system erroneously activated, causing the vehicle to abruptly stop. During the incident, the driver's head slammed into the steering wheel, causing a head laceration. No medical treatment was required. The vehicle was towed back to the dealer. The cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 120,000.

- Willcox, AZ, USA

My vehicle recently experienced a sudden flashing check engine light, severe misfiring, and rough engine operation, creating an unsafe driving condition. An inspection by an authorized GMC dealership, Serra Buick GMC Champaign, confirmed a failed deactivating valve lifter on Cylinder 5, documenting that the lifter ceased movement after a single engine rotation. The dealership advised that the failure necessitates replacement of all lifters and extensive internal engine components, at an estimated cost of $5,650.75. This defect is not isolated, unforeseeable, or the result of consumer misuse. It is directly associated with General Motors-?? Active Fuel Management (AFM) system, which has been widely reported to cause: -??Premature lifter collapse -??Camshaft damage -??Severe engine misfires -??Loss of power while driving -??Catastrophic engine failure

- Urbana, IL, USA