Engine And Engine Cooling Problems of GMC Sierra 1500 - part 1

The contact owns a 2021 GMC Sierra 1500. The contact stated that while the vehicle was parked, the battery charge indicator to zero. The vehicle lost motive power, and the vehicle was unable to exceed 30 mph while driving. The vehicle was driven in limp mode. The battery saver mode message was displayed before and during the failure. The vehicle then failed to restart. The vehicle had been repaired a year prior to the failure. The contact's blood pressure became elevated due to the issue. The failure mileage was approximately 98,000.

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6. 2l engine lost power and failed at highway speed with no warning lamp or prior indication of failure. Engine recall/pico test and oil viscosity change performed by dealer at 40,000 miles. Engine failed at 45,868 miles.

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Excessive oil consumption. I am fearful that my vehicle engine will lock up.

While turning right and at a slight incline the truck engine turned off, the transmission made a grinding noise, the truck went into neutral and the dash stayed “press start button”. This is the second time this has happened within 5000 miles of the struck being purchased. Several others have reported the exact same issue on facebook forums.

Code p1098 came up today 80k on the truck. Coolant control valve failure. Second time this has failed, first at 45k. Speed reduction activated.

On [xxx], my vehicle suffered a complete loss of propulsion on the highway, displaying fault codes p0324 and p0016. The vehicle was taken to boyd's tar heel Chevrolet in roxboro, nc, where the engine block was replaced under the official gm 6. 2l engine safety recall. The truck was delivered back to me, and on the very first day I drove it—only 28 miles from my house—it suffered a secondary catastrophic loss of propulsion on the highway on [xxx]. The check engine light began flashing violently, indicating an immediate catalyst-damaging safety hazard, and the vehicle displayed fault code p0307 (cylinder 7 misfire). The dealership explicitly instructed me to stop driving the vehicle immediately, authorized the recovery, and told me to bill the tow directly to them. After towing the vehicle back to their facility, boyd's tar heel Chevrolet reversed their position. They are now attempting to hold me financially responsible for the towing fees, along with spark plugs, wiring, and fuel injector services, claiming the failure is due to routine maintenance. This represents a severe highway safety hazard, a direct failure of the manufacturer's official recall remedy, and potential dealer misconduct to avoid liability under the active NHTSA engineering analysis ea26005 for post-recall 6. 2l engine failures. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

2019 GMC sierra denali 6. 2l , back in March 2026 my motor seized up , waited for a month for a new motor replacement that I had to pay out of pocket for 12k+, finallyy got my truck back mid may! , fast forward to [xxx], lifters and cam went out had to get replaced, I only driven under 5k miles since the motor replacement (the motor I payed for came with a 3 year warranty) , also over a months waiting… [xxx], I receive a call from the dealership saying my truck was ready for pick up but during the test drive , it started having a bottom end problem, turns out it was a bearing issue! , now they have to replace the motor again! michigan! information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving 70 mph, the engine seized, causing the vehicle to stall and lose motive power in the middle of the interstate. The vehicle was unable to restart and was towed by onstar service. The vehicle was towed to the dealer, where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was scheduled to be repaired by the dealer. The manufacturer was made aware of the failure by the dealer.

The truck has shut off driving 5 times total and 3 different days, I was going down the interstate, and hwy. Speeds were ranging from 45 to 70, this is the 3rd time in the shop. At two different dealers.

See all problems of the 2024 GMC Sierra 1500 🔎.

Dealer confirmed 6. 2 v8 engine failed at a little over 4000 miles. Dealer stated it was the bottom of the engine. Probably the same failure the 21-24 recall is for.

The contact owned a 2026 GMC Sierra 1500. The contact stated that while accelerating from a red light at 15 mph, the vehicle sputtered and shook before finally moving forward. The contact stated the failure was a recurring failure. The contact associated the failure with NHTSA action number: ea26005 (engine). The dealer was contacted. The failure mileage was approximately 160.

2026 GMC Sierra 1500 denali 6. 2l , with 3550 miles; started ticking and another mile to get home started knocking, had truck for less than a month, had it towed to the dealer they said will get a new engine, they can't even five me a time frame for the new engine replacement.

Addendum to previous submission # 11760415. At 15,033 mileage again multiple codes present along with a rough running engine. Dealership service dept confirmed on 9/17/2026 verification of 10 active codes , 2 pending codes triggering check engine light. Onstar notification as well of engine issue. Prominently codes p0016 & p0340 lead the list. Pico testing was stated to have failed two out of 3 parameters. Officially stated now as an engine defect which is being directed to be replaced with a remanufactured , not new , motor. Very fortunate to not have experienced dramatic failure ( loss of propulsion ) at highway speeds far from home. Even though this vehicle warning's persisted prior to this ultimate conclusion it was insisted that ultimate failure was necessary before any resolution would be instituted. A safety conundrum if you will. A high probability safety risk of continued use ( based on historical data on this known engine failure risk ) to ‘ prove ‘ it would fail like many others already have. A fair assessment of my personal experience.

There is an known issue with the coolant control valve that causes the truck to enter "limp mode" that dangerously reduces the engine power. The part is not recalled but there is a special extended warranty, n252508341, up to 15yrs or 150,000 miles for 2021-2022 GMC 1500 trucks but my VIN is excluded from this for some reason. I would like this investigated.

While driving 40 mph my entire dash lite up with every known light and the vehicle lost all power. The dealer stated I need an entire engine replacement, as with many 6. 2. My vehicle is 1 months out side of the recall, it has the exact symptoms and the exact damage as the recall.

I did not have anyone tell me about recalls concerning my GMC slt, when can I have what ever it takes to send me info concerning lifters, these have not had any issues yet. Will I have someone to contact me about possible lifter issue. Current miles are 18129. Thanks for your attention. Mcg.

Timing in engine is going out at 150,000 miles.

See all problems of the 2020 GMC Sierra 1500 🔎.

In August, 2019, at 93,672 miles, gm covered a lifter failure on our 2015 GMC sierra, v8 afm engine. Only the left side was repaired. Now, in 2026 at 130,000, the right side has the same issue and needs repair. The estimate to repair is $16,697. This is a known issue and a safety concern.

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The contact owns at 2021 GMC Sierra 1500. The contact stated that while driving 60 mph, the engine was overheating. The message "reduce engine power" was displayed. The contact shifted to neutral to reach the dealer. The contact associated the failure with special coverage: n252508341; however, the VIN was not included. The dealer diagnosed the vehicle with coolant control valve failure, and the vehicle was repaired. The manufacturer was made aware of the failure and stated that the cost of the repair was not covered under the special coverage program. The failure mileage was approximately 94,328.

I was driving home on the evening of September 12th 2026 and when I exited the interstate and came to a stop at the traffic signal my vehicle died and I had to have it towed. There was no way to flat tow because we couldn’t get it into neutral without the vehicle’s engine running. Once the vehicle’s engine died it would not restart. Had this happened while still on the interstate causing my vehicle to be disabled in the lane of travel it could have been deadly since it was 10 p. M. In the evening and dark outside. Anyhow had the vehicle towed to the dealership for diagnosis and the engine spun #7 rod bearing which ruined the entire engine at just 15,182 miles.

On Friday the 11th the vehicle quit running had to be towed and left me stranded in the middle of an intersection. This is a second vehicle from gm with the 6. 2 l engine that has done this to me. The dealer says it’s catastrophic engine failure, and they’re gonna replace the engine. I was told that gm edward repaired this issue but is still selling brand new trucks with this motor that has this failure, they can lead people stranded in very compromising positions.

I purchased this vehicle on may 28th 2026. At that time I was told there were no problems with the 6. 2l engine. The problems they have had didn't affect the 2026 denali 1500 6. 2l's. After hearing about numerous 25's and 26's engine failures I decided to have my first oil change at 1540 miles. I asked the dealership to give me the oil filter so I could open it and examine it. I found excessive metal in the filter, indicating to me that the engine is failing. I contacted the dealer, they told me to go to gm customer service. They told me there is nothing they can do unless the check engine light comes on or there is noise in the engine or it blows up. In which case people have reported traffic hazards getting to the side of the road without power or even the rear wheels locking up. One incident shows the vehicle had a fire and completely burned up. I made a vacation trip without incident and put another 825 miles on the truck, at which time I swapped out the oil filter and opened it up and found more metal particles. Common sense tells me that the engine is self destructing and will at some point fail. The manner in which that happens is the safety issue. I have reported this issue to the dealer and gm and they say just keep driving it. Putting myself and my family at risk. I know I am not the first one to have a bad engine in my new GMC denali. There are just way too many defective engines in these vehicles to feel safe after buying such and expensive vehicle. Don't get me wrong, I love the truck!! I just would like to know it has a dependable engine to keep me safe while driving it!!.

On 9-10-26 engine spun rod bearings per the dealership repair order miles 52,796 I was towing a car on a car trailer traveling down the interstate when the motor failed. I had my wife in the truck with me. No prior warnings just a check engine light right before engine failed. GMC dealer replaced engine and returned on 9-14-26. The truck had already had the recall to check the engine and replace the oil to a thicker oil.

2026 GMC Sierra 1500 denali 6. 2l , with 3550 miles; started ticking at 45 mph and another mile to get home started knocking, had truck for less than a month; no warning lights. I had it towed to the dealer. They said it needed a new engine, no time frame for repair.

When updating the vehicle as prompted by the entrainment system the next day when attempting to start the vehicle it did not start. Vehicle had to be jumped then 6 warning lights came on and disappeared shortly after driving.

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Engine I believe the truck died while I was doing 78 mph on the highway dashboard stated “shift into neutral and press start” I pulled to the side of the road and did what it stated and it would not crank over. I also put it in park turned the vehicle off and back on to try to start it. The lights on the dashboard, all gauges, the ac, and everything works the truck just will not crank over. Check engine light came on but is not throwing any codes.

Catastrophic engine failure at 77357 miles. I went to the local gm dealer and my VIN is not in the l87 engine recall. Not sure how to repair my truck , but feel like the engine should not have locked up with such low miles, and I done constant engine maintenance , meaning oil changes every 5k miles.

1. I am being told that the high-pressure fuel pump (hpfp) catastrophically seized and locked up internally while driving. Because the hpfp on the 3. 0l duramax (lm2) engine is directly driven by the engine's timing system, this sudden mechanical seizure instantly destroyed the engine timing gears and snapped/skipped the timing chain. The failed components are currently intact inside the vehicle and are fully available for inspection upon request at ron’s smith GMC in merced, CA. 2. The failure occurred on busy labor day (xxx) while our family of [xxx] was traveling back home at 70 mph on a major highway. The truck violently shook, instantly lost all engine power, and forced the vehicle into a dangerous limp-mode state before completely stalling in live highway traffic at night around 10:45 pm. This sudden loss of propulsion at high speed severely compromised our ability to safely navigate out of the way of fast-moving highway traffic, creating an immediate & extreme risk of a high-speed rear-end collision. At times hazard lights didn’t work causing family panic & screaming as truck shook with passing traffic. 3. The problem has been officially confirmed by ron smith GMC in merced, CA. Their service department diagnosed the issue, confirming that the high-pressure fuel pump had locked up and subsequently destroyed the timing belt/chain and engine gears. 4. The vehicle and its failed components have only been inspected by technicians at the ron smith GMC dealership service department. No police, insurance representatives, or outside third parties have inspected the vehicle yet. 5. I had been extremely happy with my truck and there were absolutely no warning lamps, dashboard messages, or driving symptoms prior to the failure. The truck was operating perfectly normally under cruise until the exact moment of the failure, at which point a "reduced engine power" warning flashed on the dashboard simultaneously with the mechanical lock-up, shaking, and immediate stall. Information redacted pursuant to the freedom of.

1. I am being told that the high-pressure fuel pump (hpfp) catastrophically seized and locked up internally while driving. Because the hpfp on the 3. 0l duramax (lm2) engine is directly driven by the engine's timing system, this sudden mechanical seizure instantly destroyed the engine timing gears and snapped/skipped the timing chain. The failed components are currently intact inside the vehicle and are fully available for inspection upon request at ron's smith GMC in merced, CA. 2. The failure occurred on busy labor day (xxx) while our family of [xxx] was traveling back home at 70 mph on a major highway. The truck violently shook, instantly lost all engine power, and forced the vehicle into a dangerous limp-mode state before completely stalling in live highway traffic at night around 10:45 pm. This sudden loss of propulsion at high speed severely compromised our ability to safely navigate out of the way of fast-moving highway traffic, creating an immediate & extreme risk of a high-speed rear-end collision. At times hazard lights didn't work causing family panic & screaming as truck shook with passing traffic. 3. The problem has been officially confirmed by ron smith GMC in merced, CA. Their service department diagnosed the issue, confirming that the high-pressure fuel pump had locked up and subsequently destroyed the timing belt/chain & engine gears. 4. The vehicle and its failed components have only been inspected by technicians at the ron smith GMC dealership service department. No police, insurance representatives, or outside third parties have inspected the vehicle yet. 5. I had been extremely happy with my truck and there were absolutely no warning lamps, dashboard messages, or driving symptoms prior to the failure. The truck was operating perfectly normally under cruise until the exact moment of the failure, at which point a "reduced engine power" warning flashed on the dashboard simultaneously with the mechanical lock-up, shaking, and immediate stall. Information redacted pursuant to the freedom of.

My 2024 GMC sierra 6. 2 engine had th recall scope work done on the engine. I was told it passed and they changed the oil to the 0-40. Well apparently that was not the case and the bearings in the drive shaft and whatever holds it together broke.

I was driving on the highway at 70mph when out of no where my truck stopped running and I received a message warning to put the truck in neutral and restart the engine. It was very alarming being on the highway and this happening. I was unable to restart the vehicle so I had to coast and navigate us at high speed to the should of the highway. Since it was labor day I had to sit for over 4 hours before getting a tow vehicle at 2am to tow my truck to [xxx] flow Buick GMC. They contacted me and told me that my engine had seized and that it was possible bearings or something that made it seize and I need a whole new engine. They quoted me $12,500. I have not done anything yet in repairs and I now contacted gm and submitted a case #xxx. I notified them I am aware of the known issue and the gm service bulletin pip5900. I am waiting for them to respond now. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving 65 mph, the engine made a clunking, knocking, and tapping sound. The engine was driving on seven of the eight cylinders. The contact slowed down and pulled over. The engine warning light was illuminated. The vehicle was taken to the local dealer and was diagnosed with a detached valve. The vehicle was repaired under an extended warranty. The dealer informed the contact that the failure might recur. The failure mileage was approximately 12,998.

I was driving my truck and I had a sudden loss of power. The engine sounded like a rattle of bolts. It was towed to the dealership and they replaced the engine.

At just below 5,000 miles of use, my new 2026 GMC sierra at4 (6. 2l v8 engine) is currently undergoing a total engine replacement arising from traces of metal being detected in the oil filter. Although covered by GMC warranty since it is essentially a brand-new vehicle, I wanted to report this issue as it is most likely part of the large gm recall pertaining to this l87 engine since I am concerned this is related to ongoing 6. 2l l87 engine failure investigation. It is expected to be out for around 4-6 weeks with a new engine incoming and would want to be covered if the new engine fails in the future with any issues relating to this case.

On xxx my 2025 GMC sierra 6. 2l v8 engine experience catastrophic engine failure with no preexisting alerts or warnings. It was towed to baglier GMC in [xxx] on xxx and is currently awaiting diagnostic evaluation. Upon restarting the vehicle after failure, the engine light did turn on. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).