03/08/2025 While at Interstate speed engine turned off as did the entire vehicle electrical system in the truck. Steering control was maintained (though not power assisted) and brake control was in the same position. Truck was brought to a safe position in the breakdown lane and a re start was attempted to find that engine would not rotate and a number of dash indications were displayed including check engine. No indication of low oil pressure light nor any other warning was displayed prior engine shutdown event were noted. Truck was taken to an independent repair center for evaluation. Initial inspection noted that engine would neither turn via electric starter nor by manual rotation of crank shaft with a socket and breaker bar. Truck may be inspected near owners residence. Safety risk was low due to the low traffic condition of the interstate travelled at the time.

- Cunningham, TN, USA

The transmission on this vehicle has given me problems. I have had the vehicle in a certified garage many times with complaints of a hard shifting transmission. First Chevrolet told me -??it-??s normal-?? but there is nothing normal about jerking so hard it throws a drink from a cup holder. Then I was told I needed a transmission wash. That was about $500 for it to -??fix-?? the problem. Chevrolet told me the transmission was may or may not work and it may only be temporary. In my case it has reduced the hard shifting transmission but it-??s still obvious. Now when I drive I remove my foot from the accelerator when it shifts from 1st to 2nd. I also make sure to keep a spill proof lid on my coffee because I never know when the transmission may throw it out of the cup holder.

- Galax, VA, USA

The contact owns a 2022 GMC Sierra 1500. The contact stated that after shifting to park(P) and turning off the vehicle, the message "Shift to Park" remained displayed on the instrument panel, with an audible chime coming from the vehicle. The contact was forced to use the key fob to lock and unlock the doors several times to correct the failure. The dealer was notified of the failure and an appointment was scheduled to have the vehicle repaired. The manufacturer was notified of the failure and provided the contact with a case number. The contact was then referred to the NHTSA Hotline to report the failure. The vehicle was not repaired. The failure mileage was unknown.

- Laurinburg, NC, USA

The contact owns a 2022 GMC Sierra 1500. The contact stated that while her husband was driving 30-35 MPH, the vehicle stalled. No warning lights were illuminated. The contact's husband was able to pull over onto the side of the road. The contact's husband attempted to restart the vehicle, and the vehicle failed to restart. The vehicle was towed to the dealer where it was diagnosed and determined that the engine had seized and needed to be replaced. The contact's husband stated that the tow truck driver could not move the gear shifter into neutral(N) when the vehicle was being towed. The vehicle was not repaired. The manufacturer was notified of the failure. The vehicle remained at the dealer and had not been driven since. The failure mileage was 81,000.

- Litchfield Park, AZ, USA

Engine catastrophic failure while under extended warranty. Engine failed in February of 24 however I had told dealership I was having troubles with Engine and shifting also tires from 1st 11000 miles it also kept reduce power on me and basically shut down 3 times in middle of hwy. The 6.2 engine locked up on the mechanic who was test driving it. Took 3 months

- Blackwell , MO, USA

While driving at 65 mph, the engine locked up, the truck went into neutral, and all power was lost. This occurred with no warning at all. The truck was towed 40 miles to a GMC dealership for repairs. GMC dealership has indicated that the engine is permanently locked up and will have to be replaced. The dealership did not provide any explanation as to why the engine locked up.

- Franklin, TN, USA

Coolant control valve failure (P1098) after 50k service. When this engine code appears the vehicle goes into reduced power mode. While it does this at inopportune time and creates potential for colission with other vehicles such as when merging with traffic. The coolant control valve is a known issue and GM has just recently recalssified it from their powertrain warranty to their much shorter bumper to bumper or emissions warranty without notifity owners of this change. This move directly puts owners and drivers at risk while on the road. GM should be accountable to resolve this problem as failures are across multiples years and are happening to vehicles at all milages with some less than 5k miles. This is an obvious failure on their part and they should be required to rectify the situation.

- Puyallup, WA, USA

On or around January 27 2025 my 2022 sierra loss power and shut down at night and dropped to 0 rpm. I was close to the house and got pulled home by relative. When I did get it cranked lifters were tapping which was common in the 6.2 but I drained my oil and filter and saw the glitter look. Truck was still tapping after warmed up. Last night I about got hit at an intersection when same thing happened. I felt a jar, and truck went to zero rpm and loss power. Truck said, put in neutral and try again. When I pushed starter had a click. Then I pushed start again and it started smoking. It burnt my starter up, because engine is seized. I saw where there is an investigation on this and I really hope it goes through because that was a scary moment and it is safety concern. Twice the same thing. But now can-??t turn crankshaft, nothing to drive, making payments on a 80,000 truck that is my personal and work vehicle. 92000 miles on my truck and have my oil changed regularly. I-??m stuck between rock and hard place, but will be getting it towed to a dealer somewhere. To here I need a 6.2l engine in my sierra slt. 2 year old truck it is stressful. I know im going to here 10,000 $$$ I don-??t have.

- Bethune , SC, USA

Engine - catastrophic failure 6.2 liter V8. Vehicle is currently at dealer awaiting full engine replacement. Failure left me stranded waiting for tow to dealer. Problem has been diagnosed as rod and main bearing failure, engine replacement imminent. Vehicle was running perfectly fine all day. Went to take my daughter to basketball practice in evening initially everything was fine, then we heard squeeking, turned around to bring right back home, lost power in intersection, truck stalled. Got restarted check engine light came on and limp mode reduced power activated. Truck towed to dealer and oil pan was pulled. Rob and main bearings have scattered metal throughout the engine. Truck confirmed to need full replacement.

- Hampshire, IL, USA

The contact owns a 2022 GMC Sierra 1500. The contact stated while driving at approximately 55 MPH, the infotainment system, and the rearview camera became inoperative, and the vehicle stalled. The tailgate unintendedly opened, and the steering and lane control assist feature independently activated causing the vehicle to steer in the other lanes. The contact stated while the vehicle was in reverse, the vehicle unexpectedly shifted to park. No warning light was illuminated; however, the "Check Suspension" message was displayed on the instrument panel, and lights on the instrument panel were intermittently darkened. The headlights were intermittently illuminated independently. The failures had occurred on several occasions. The vehicle was taken to a dealer to be diagnosed; however, the results were unknown. The vehicle was repaired; however, the failure persisted. The manufacturer was not notified of the failure. The failure mileage was approximately 15,000.

- Pomeroy, OH, USA

Used my truck to back out of the driveway and wouldn't go into reverse at all. Towed to dealership and said problem was transmission valve body went bad. Dealership said TVB fail all the time in these trucks. They told me that this part is on back order and could be 2 or 3 months to get part in. GM has and known transmission issues. This truck is little over 2 years old and only has 40k on it. I'm hearing that TVB are failing while driving and creating dangerous situations and GM isn't doing anything about. Truck is under PT warranty. I asked what can't GM just put a new transmission in? They say it's not cost effective. So cost is over safety i said!

- Utica, NY, USA

My truck lost power while driving on the interstate.. had to restart while traffic moved around me.. truck eventually restarted and then again died while getting off exit ramp in traffic. Towed to Dealership and was diagnosed with a "blown" rod bearing. Full Engine replacement.

- Clarkston, MI, USA

My 2022 Sierra Denali shows message "Shift To Park" when turning off, even though it has been shifted to park, the dashboard stays lit as well as the radio on. Horn even goes off alerting as if the engine is on and me walking away with the key in my pocket even though engine is off. Have to play with shifter to get it to stop, sometimes turning it back on and off will do trick. Locking it with remote works most of the time but when this happens, I can't use remoteless key access, door just won't lock.

- Spring, TX, USA

The contact owns a 2022 GMC Sierra 1500. The contact stated while her husband was driving 40-45 MPH, the vehicle experienced reduced engine power and failed to exceed 30 MPH. The driver was able to pull to the side of the road. The driver turned off and restarted the vehicle. The contact stated that upon shifting to reverse(R), the RPM decreased, and the vehicle failed to respond. The driver was able to drive to the dealer, where it was diagnosed that the transmission had failed, and there were metal shavings inside the transmission. The dealer determined that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that the VIN was not included in a related recall. The manufacturer referred the contact to the NHTSA Hotline for the VIN to be added to a recall. The failure mileage was approximately 90,000.

- Plummer, ID, USA

When the truck reaches approximately 50mph it is unable to shift into the next gears and then it's unable to downshift. The transmission will not go into neutral. The truck must be stopped and turned off, sometimes it will need to be restarted 2x before it's able to shift into first gear. The outdoors temperature was approximately 24F, transmission temp was 178F. The truck locked into 7th gear 6x in a row while the transmission was set to normal driving mode. There were no signs of transmission failure until the vehicle reached approximately 50mph, afterwards the check engine light illuminated, a warning stating "reduced acceleration drive with care" and "service transmission now unable to shift soon". The trucks RPMs were approximately 2500rpm while driving 45mph and would not go down because the transmission would not shift up or down.

- Litchfield, MI, USA

The contact owns a 2022 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle suddenly shifted into a higher or a lower gear, the contact stated that when this occurs the vehicle will aggressively jerk into either the higher or lower gear, and the vehicle experiences reduced acceleration to approximately 30 MPH. The check engine warning light was illuminated. The vehicle was taken to a local dealer where the vehicle was diagnosed. The contact was informed that there was a leak in a backflow valve that was responsible for the failure experienced. The contact stated that the failure had occurred five times was provided different causes for the failure, even though the contact stated that the failure was the same failure. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 30,000.

- Lancaster, NY, USA

The transmission failed without warning. The truck jerked several times and wouldn't go forward, eventually stopping, putting the driver at risk of being hit or losing control. There were no warning lights or issues prior to this. It was towed to the dealer who knew immediately that the transmission valve body had failed. He said this is a known problem and in fact there was a service bulletin issued last year by GM. As of now he told us there are 2000 vehicles waiting for this part. The part has been redesigned because GM knew it was faulty. Our truck is still at the dealer waiting for the part after a month. Others have been waiting for months. GM is not allocating the part for current customers but instead putting the majority in new vehicles even though they know there are thousands of vehicles less than 3 years old on the road and putting people in danger! The rest of us are left without a vehicle. You are welcome to inspect our truck at the dealership where it currently sits.

- Temperance, MI, USA

In the past 6 years I have owned 4 GMC 6.2L trucks the first was a 2019 no issues great truck. The second unfortunately had a Short life with another vehicle. In 2023 The third a 2021 Denali 6.2L truck at 34k began using oil and blowing blue smoke out the tailpipes. The dealer started an oil consumption test (like you couldn-??t see it happening) so finally at 45k they tore down the engine and found worn out valve guides and scored cylinders. They ordered an engine the engine was installed and it failed in 25 miles come to find out it was not oiling on one bank, A second motor was ordered and installed it failed at start up. At this time it had been months that the truck was down. The dealer took a stand and moved me into a 2022 GMC AT4 with 6.2L with the hopes of removing the issue this truck was the internet sales managers truck that he had recently bought and had 15k on. We made the deal, well at 35k this truck begins consuming oil. The dealer once again starts the oil consumption test process. A couple of months ago. The truck now has 42k or so on it and on my last trip from Atlanta to Fort Walton after the dealer just topped it off 2 1/2 weeks prior to the first 2500 interval of the oil consumption test, the truck burned 1 1/2quarts in less than 2k miles and the oil warning light comes on as we arrive in Fort Walton. I would like a resolution to this, I have invested a lot of money into what should be one of the most reliable trucks on the road and all I hear is GM says it-??s not met their threshold of a problem and you should expect to have to add oil to a truck with less than 45k on it and it-??s not a problem. It-??s already been proven with the 2021 that GM has a problem, I as well as the other 100,000 or so individuals with this same engine and GM knows it-??s a problem with the quality of the engine build. GM has a quality issue and knows it but they are not addressing it, just making the consumer jump through hoops and not finding a fix in 5 yr's is bad

- Dacula, GA, USA

The contact owns a 2022 GMC Sierra 1500. The contact stated upon accelerating and driving at approximately 5 MPH, the vehicle violently jerked. The vehicle began to drive as designed, but the failure recurred. There were no warning lights illuminated. The vehicle was taken to the local dealer, who test-drove the vehicle and experienced the failure, but the vehicle was not diagnosed or repaired. The failure mileage was approximately 52,000. The VIN was not available.

- Greenville, TX, USA

The engine failed while driving on the expressway. It is clearly the fault of the Active Fuel Management (AFM) system but GMC will not honor the warranty because I went over 7,500 miles between oil changes. This is a problem because the car stopped operating while driving down the interstate. Manufacturer inspection took place. They looked at the oil filter and saw the metal in the oil filter. No warning lamps, messages or symptoms of any sort prior to the engine failure.

- Ann Arbor, MI, USA