2019 GMC Sierra 1500: sudden loss of power

Filed Nov 5, 2026 · Engine, Transmission · AL

1. The engine has failed. Yes it is available upon request. 2. My safety was put at results because the vehicle loss power/pressure as I was driving. 3. Yes the problem has been confirmed by an independent service center. 4.The vehicle has been inspected by an ASE Certified Mechanic. 5. The engine light came on in the vehicle. Carshield Denied Claim, therefore I am responsible for the repairs. I spoke with GMC and it was nothing they could do and advised me to contact the federal safety agency.

Filed Oct 20, 2026 · Engine, Fuel system · FL

Recall N262576260 has just come out. My truck has the same symptoms/conditions consistent with the recall. I have a code P0420, check engine light, high oil consumption and loss of power. also, the GM representative i spoke with told me i have an open recall N242450631. it does not show on the federal safety agency website and it does not show at the dealer. the high oil consumption has allowed the turbo to damage the catalytic converter and something in the engine to tap due to less lubrication.

Filed Oct 11, 2026 · Engine · AL

The engine started making a loud knocking noise and lost power. Luckily the event happened in a neighborhood and no one got hurt. The check engine has been on for brief periods prior to this event.

Filed Sep 22, 2026 · Engine · 88,000 miles · NY

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at speeds above 60 MPH, the vehicle lost power and decelerated to approximately 10 MPH, with a knocking sound coming from the engine. The vehicle was driven off the highway and taken to the local dealer to be diagnosed. The contact was informed that the engine had experienced internal damage to the #4 lifter and a bent #4 pushrod and damaged the #4 engine camshaft lobe. The contact was informed that the engine needed to be replaced. The vehicle was not yet repaired. The contact stated that the dealer was previously informed of a ticking sound coming from the engine. The manufacturer was notified of the failure. The failure mileage was 88,000.

Filed Sep 8, 2026 · Transmission · IL

I had complained to the dealer less than one year after purchase in may of 2019 that there was a shuddering noise and the transmission hesitates and seems to lock up at times. I was told it was "just how the 8-speed transmission operates". It has contnued throughout ownership and now seems to lose power and vibrates excessively during acceleration.

Filed Aug 30, 2026 · Engine · MO

My 2019 6.2 engine suffered from severe loss of compression caused by internal piston ring failure and bore scoring also loss of power . In the 6.2L engine , piston ring failure and ring- seal are direct consequences of connectiing rod alignment errors, My engine failure is proof that this is the same situation that is currently under investigation and have proof with compression test and report done by my Technician . First time it happened to me it just stopped on me in the middle not the road all lights came on the dash including ESC light something it never done before. But before this happened it had been running rough. I took it first to the local repair shop and they wouldn't be able to work on it , So I took it to the local dealer and there it got. worse from there . Took it to the dealer changed the battery and it was running again but they found it had really bad leak on the rear main seal spent over $3,000 for all of it. Thought the problem was over after that months later after it was running rough again took back to the dealer and from there they told me there were oil coming through the piston rings and metal shaving in the engine and from there found out engine needed to be replaced Warranty company would not cover it. I had to pay 1500.00 for rental car coverage, teardown of engine was 3,500 since the extended warranty did not cover it Endurance Warranty Co. denied my claim.Dealership is charging me out of pocket charges of 13,495 for the engine replacement plus engine teardown Endurance Warranty Co. denied my claim. Even after paying for warranty for almost 2 Years. GM says manufacture warranty is out of coverage can not be apart of the recall but engine failure mirrors 21-24 recall 6.2 engines.

Filed Aug 19, 2026 · Engine · CO

On XXX at approximately 3:00 p.m., I was driving on the highway in [XXX], at approximately 65 mph when my truck suddenly displayed a warning stating that all oil pressure had been lost and that the engine needed to be shut off immediately. Within roughly seven seconds of seeing and comprehending the warning, I attempted to safely shut down the engine. Before I could do so, the engine seized while the truck was still traveling at highway speed.The engine failure caused an immediate loss of power steering and power-assisted braking, leaving me with limited control as the truck coasted at highway speed. This was an extremely dangerous situation that could have resulted in a serious accident, injury, or loss of life. The truck was towed to a repair facility, where technicians confirmed that the engine had seized and recommended replacing the long block. A new GM Genuine Parts engine was installed, and the repairs were completed on XXX. Today, XXX, the replacement engine has approximately 40,000 miles on it. I recently began hearing a ticking noise followed by knocking, and the engine nearly stalled while idling. I immediately checked the oil and confirmed that oil was present on the dipstick. I have consistently maintained the vehicle and completed every oil change at intervals of 5,000 miles or fewer. I returned the truck to the same repair facility that installed the replacement engine and was immediately informed that the truck requires yet another engine replacement. This is now the second 6.2L L87 engine that has failed in this vehicle. Two catastrophic engine failures—one involving a replacement GM Genuine Parts engine after only approximately 40,000 miles—are completely unacceptable. The first failure created a severe highway safety hazard, and the failure of the replacement engine raises serious concerns about the reliability and safety of these engines. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jul 28, 2026 · Engine · ID

The Lifter on my GM Sierra AT4 truck with a 6.2L (L87) engine collapsed and damaged the engine shafts and cylinders in the block. While driving, the engine started to lose power, and a ticking noise started to occur. I pulled the car over to the side of the road and called the dealer, which told me to have the truck towed into the dealership. Metal was found in the Oil. The entire engine has to be replaced for $12K. I have a life time oil change service with the dealer an also an extended warranty, but my mileage was over the warranty by 6K miles. The warranty ended at 106K miles and actual milage was 113K. I reached out to my dealer and also to GM to discuss goodwill assistance and GM pushed back indicating they cannot do anymore. I asked the rep to esalate the ticket

Filed Jul 15, 2026 · Transmission · GA

TSB 19-NA-121. My truck is experiencing the exact issues detailed in the listed TSB. Randomly and quite often my truck feels like I am running over speed bumps. This just started about 3 days ago. The truck has been maintained. Oil is changed on time and there was a 100,000 mile service and I just had a 150,000 service done. Currently there are roughly $148,000 miles on the vehicle. Is there a way to have GM cover the costs of the repairs even though my VIN# was not listed. Also I am experiencing sudden power loss which is also mentioned in other bulletins. Basically it feels like the engine hesitates to accelerate.

Filed Jul 14, 2026 · Engine, Fuel system · PA

Total engine power loss while driving 70mph on the highway in steady moving traffic causing a safety hazard, with 3 young children in the vehicle. No prior warning lamps, messages or symptoms to indicate a problem. Engine completely shut down while driving and will not turn back on. Had vehicle towed to the dealership. Certified GMC dealership did a full inspection and indicated that the engine assembly needs to be fully replaced. the federal safety agency Campaign 25V274 for vehicles 2021 and newer is for the same exact engine failure issue with the same engine size. I would appreciate you exploring the possibility of covering this catastrophic malfunction as an exception to the aforementioned recall campaign. Many other drivers have noted the same failure with the 2019 as was included in the recall for 21-24. Thank you for your consideration, please feel free to reach out to me directly to discuss further. I look forward to hearing from you!

Filed Jul 7, 2026 · Engine · KY

I believe I had a lifter failure as I was traveling up SR 393. Safety issue as vehicle lost power. Vehicle is at dealership now and confirmed possible lifter collapse. No dashboard lights were on or any power issues prior.

Filed Jun 23, 2026 · Engine · AZ

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