I pulled up to a traffic light at a busy intersection in Lubbock, TX, and the engine just shut down on approach to a red light. The vehicle still had power (radio, headlights, AC/heater, etc.) but the engine would not start or even turn over and try to start. The vehicle was towed to a Chevy dealership in Lubbock, TX, and they said they believed it was an internal engine failure but wouldn-??t be able to look at it for several weeks. I had it transported to my hometown in Taylor, TX, and my certified mechanic replaced the starter and battery solenoid but the engine still wouldn-??t start. They drained the oil and found metal shavings in the oil. They too believe that the engine suffered a catastrophic failure and needs to be replaced.

- Taylor, TX, USA

The Timing Chain failed. It is at the Dealership available for inspection. Vehicle was unable to accelerate correctly while driving. If it had blown a valve or locked up the engine we would have been stuck on the highway with my kids in the vehicle. Problem has been confirmed with the dealer. It is a known defect with this vehicle but my VIN was not one that was recalled. No issues had came up before it failed. Just went to accelerate and you could feel it slipping and the truck stuttering forward.

- Alcoa, TN, USA

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at various speeds, the vehicle unexpectedly sputtered. There were no warning lights illuminated. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA Hotline for further assistance. The approximate failure mileage was 73,000.

- Parma, OH, USA

What happened: In mid-December 2025, my 2020 Silverado 1500 (VIN: [XXX] ) suffered a catastrophic failure of the DEF Tank Assembly (P/N 84914535) at 29,354 miles-?"less than 30% of its warranted life. This is a latent design defect involving undersized terminal pins that suffer thermal degradation and melt the connector during high-amperage heater operation in arctic conditions (Ref: GM TSB 21-NA-006). Component Availability: The failed assembly is held at the dealership. I have submitted a "Part Preservation Request" to ensure it is available for forensic inspection by federal regulators. Safety Risk: The failure triggers an EPA-mandated "Limp Mode, " initiating a software-forced reduction in speed. Unexpectedly losing speed on high-speed, icy Alaskan highways-?"where roadside snowbanks prevent safe egress-?"creates an extreme risk of rear-end collisions. Furthermore, a vehicle restricted to 5 MPH or rendered inoperable in temperatures of -30?F to -50?F poses a direct, life-threatening risk of cold-weather exposure in remote areas. Confirmation: Failure was confirmed by Lithia Chevrolet GMC of Fairbanks on Jan 7, 2026. GDS2 diagnostic verified DTCs P20B9, P20C1, P205D, and P204C. Data was reviewed by the GM District Manager of Aftersales (DMA) and GM Customer Assistance (Case #[XXX]). Warning Symptoms: Check Engine lamp and "Service Emission System" message appeared in mid-Dec 2025, followed by a "Speed Limited" countdown. The electrical disconnect was abrupt due to terminal pin melting, as documented in my forensic engineering report. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Fort Wainwright, AK, USA

The 6.2L engine failed. The same as the 2021-2024 recalls.

- Savannah, GA, USA

The truck had a lifter failure which caused the pushrod to bend damaging the camshaft as well. I spent $5000 dollars just for the problem to happen again. I-??ve have spent nearly $10000 on this issue. This not something you expect from a truck that you pay nearly $60000 for.

- Hiram, OH, USA

Engine Failure 6 Nov 2025 Yes, engine is available for inspection. Possible loss power, unable to control the vehicle. Vehicle engine failure has been confirmed by dealership, Ruben Milton Chevrolet and Jim Hudson Cadillac in Augusta Georgia. Vehicle has not been inspection by manufacturer, police, insurance representatives. No warning light, no knocking noise, no messages on dashboard.

- Hephzibah, GA, USA

GM declared my original engine as unfixable and decided to replace my engine luckily with 2 weeks remaining in warranty. It had similar clicking noise to everything else I've seen related to this 6.2L having issues. It currently has a new engine that can be inspected if need be. As well as receipt given to me from Klein Chevy from engine replacement. My engine could've failed while driving if I didnt notice the clicking noise prior to getting it looked at. Putting other in danger if driving on a public roadway. Yes the noise/defect was reproducible upon dealer looking at it. Unsure if the vehicle was inspected by the actual manufacturer but they removed my motor and sent it back to the factory. Was never inspected by police or insurance that im aware of There was no check engine light or warning lamps, only thing I noticed was a clicking noise that the common layman would have probably missed, they appeared roughly around 46,000 miles.

- Krakow, WI, USA

Driving on highway truck lose power, engine lights start to flash and cracking noises start to come from engine. The lose of speed almos cause another vehicle to rear end me, Truck gave no signs or warnings before. Truck was delivered to a local shop and due abundant amount of metal flakes in oil engine need to be replaced

- Poolville, TX, USA

While driving at highway speeds, multiple warning lights illuminated on the dashboard at the same time, including engine and powertrain warnings. The vehicle suddenly began operating abnormally, with loss of power and unstable driving behavior, making it unsafe to continue driving. This same issue has occurred multiple times previously and the vehicle has been taken to an authorized Chevrolet dealership for repairs on three separate occasions. Each time, repairs were performed, but the problem returned. The most recent incident occurred while driving on the highway and created a serious safety risk to the driver and other vehicles. The vehicle is not safe to drive.

- Yonkers , NY, USA

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that upon starting the vehicle, there was an abnormally loud engine camshaft bearing sound coming from the engine. The engine warning light was illuminated. The vehicle was taken to the local dealer, and after three days, it was determined that the camshaft bearing had failed, and the engine needed to be replaced. The vehicle was not repaired. The contact linked the failure with NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling) and NHTSA Action Number: EA25007 (Engine and Engine and Engine Cooling). The manufacturer was contacted and opened a case. The failure mileage was approximately 45,000.

- Racine, WI, USA

What component or system failed or malfunctioned, and is it available for inspection upon request" Based on information from ODI Resume EA25007 & Safety Recall N252494002, it is more than likely engine connecting rod bearing failure. How was your safety or the safety of others put at risk? I was traveling at freeway speed, 70mph when it occurred. Has the problem been reproduced or confirmed by a dealer or independent service center" 11/25/25 at 12:33 (pacific), I am currently stranded 190 miles from home and waiting for the truck to be towed to the dealer. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others" It has not. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear" Prior to Failure: Since I-??ve owned the vehicle, I-??ve notice slight ticking and slight knocking during cold start within the engine bay. At the time the noises seemed normal and not cause-for-concern. At Time of Failure: I was traveling on level grade on the highway when I heard a deep knock from the front, bottom left side of the engine bay. Within about a minute from the initial noise, I received a -??check engine-?? warning light and a message of -??ESC Warning-?? displayed on my instrument cluster. At that moment, I noticed the engine noise become more prevalent and constant. I immediately slowed and coasted to my next exit off the freeway.

- Walnut Creek, CA, USA

The Engine began to make a knocking noise at ~62000 miles on the odometer. I assume it was bearing failure. MURREY CHEVROLET GMC diagnosed the problem as catastrophic engine failure with the repair being a replacement of the engine. There were no warning lamps. This is a 2020 Chevrolet Silverado High Country with the 6.2L engine.

- Elkmont, AL, USA

Fan started running non stop, we overheated, engine cut out and says reduced power. This diesel engine has 80k miles which is nothing for a diesel.

- Deming, WA, USA

Loss of power when driving and a shutter feeling when accelerating. I took the vehicle to the dealership for repairs and was told the torque converter was replaced due to it being faulty but problem still persists.

- Mission, TX, USA

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving approximately 40 MPH, there was an abnormal pop and ticking sound coming from under the hood. The check engine and several other unknown warning lights were illuminated. The vehicle was taken to a local independent dealer, where it was diagnosed with a failure in cylinder #7 and piston failure. The vehicle was not repaired. The local dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 99,600.

- Albertville, MN, USA

Driving at normal highway speeds, "service parking brake", "service engine", and "electronic stability control" lights illuminated on the dash with no prior warning. When attempting to accelerate, to maintain highway speed there was noticeable roughness to the engine along with a tapping sound. I slowed and made the trip back to my home under reduced power. The vehicle was towed to the dealer the following day per the dealer's service advisor instructions. Issue was diagnosed as a collapsed lifter, bent lifter rod and damaged cam lobe. Total repair cost exceeded $10,000. Internet search of this issue reports a number of drivers reporting similar issues with the Chevrolet 5.3 liter engine. If this issue had occurred in a more congested traffic area it could have caused an accident when my engine power was suddenly reduced without warning.

- East Taunton, MA, USA

While driving on a residential side street my 2020 Chevrolet Silverado 1500 (81,996 miles) suddenly lost power steering and braking with no waring. Several messages appeared in the dash and the check engine light illuminated. I was able get the vehicle safely to the shoulder and put in park without power steering or brakes. At this point the engine stalled and would not restart. The vehicle was towed to the nearest Chevy dealer on 10/29/2025. The technician verified the loss of power steering, brakes, and several other codes and diagnosed the issue as corroded engine grounding straps per GM bulletin #23-NA-201. The grounding straps were replaced and the codes cleared. The technician test drove the vehicle and verified normal operation after the repair. I was responsible for paying the full cost of these repairs as my vehicle was out of warranty. I feel incredibly fortunate that this happened on a residential side street with no traffic. Had this failure happened on the expressway while pulling my 4,000 lb trailer, this could have been a fatal accident if I suddenly lost power steering, brakes and had the engine stall like it did. I see multiple complaints for this issue on the NHTSA website and the GM TSB for this issue dates back to 2023. I am shocked that this is not a nationwide recall yet. It is a significant safety threat to the driver and others. I also know this is not an isolated incident, as my service advisor at the dealer suggested it was probably the grounding straps before the technician even inspected my vehicle. It was pretty clear from our conversation that I was not the first vehicle they had repaired with this issue.

- Rochester, NY, USA

my 2020 High Country Deluxe 6.2 L87 GM Motor: At Every Cold startup, the engine sound is erratic and sounds like metal on metal for internal combustion for approximately 2 seconds until the newly designed two-stage, variable displacement vane-type pump oil sump pump. The biggest issue that I have with this design is, with a 2 stage pump, depending on the engine rpm, according to GM is Possible lower psi to pump the oil to the top end Valve assembly. In addition, the OW/20 oil IMHO is too thin and does not have the Viscosity to lubricate the motor properly. GM Fix (for 2021 -2024 L87 6.2 motors was to change the viscosity to 5W/30 Supercar Synthetic oil, add a leaf to the owners manual to dictate the oil viscosity change and changing the oil cap from 0W/20 to 5W30. 10-speed Hydra-Matic 10L80: Hard upshifts and downshifts intermittently and confusion of proper gears. There is a TSB regarding this specific Valve Body and torque converter issues. Finally: When deactivating DFM Random cylinders as needed by ECM-TCM-BCM, the lifters are staying in the collapsed state and cant return to full height resulting in bent push rods, rocker arm damage, Camshaft damage, crankshaft damage and Catastrophic engine Failure. It now seems that NHTSA has issued a New Federal Probe into the remaining 2019-2021 L87 6.2 motors.

- Raleigh, NC, USA

Summary: While driving, the transmission intermittently fails to shift and the truck has locked up and screeched to a complete halt approximately four times, creating a sudden stop/near rear-?'end-?'collision risk. Details & timeline: First symptoms were around 55,010 miles. On 10/13/2024 the Chevrolet dealer performed -??SERVICE TRANSMISSION GM-?? (fluid & filter), but the condition continued. In April 2025, a shop documented DTC P0700 & P2727 (pressure-?'control solenoid), burnt transmission fluid, and clutch material in the pan, and recommended replacing the transmission, transmission cooler, and cooler lines. Earlier, the transmission control module was reprogrammed, and oil cooler lines were replaced, but the truck still intermittently fails to shift while driving. The check engine light has illuminated during some events. Engine safety concern: During the same period the engine oil was found very low/-??no oil on dipstick-?? with no external leaks; an oil-?'consumption test was recommended, raising concern about internal engine damage and possible contamination from the transmission failure. Safety impact: The lock-?'up / abrupt stop events occurred while the vehicle was in motion at approximately [~speed and road type, e.g., 35-?"55 mph on city/secondary roads], forcing hard braking by vehicles behind me. This presents a risk of sudden loss of propulsion and crash. Frequency: About four lock-?'up events so far; shifting failures are intermittent and ongoing. Current status: Vehicle at ~73,000 miles. A Chevrolet dealer is being asked to perform a factory diagnosis and to submit a manufacturer goodwill/warranty review.

- Box Elder, MT, USA