2020 Chevrolet Silverado 1500: misfire or rough idle

Filed Oct 20, 2026 · Engine · WA

Had a misfire in cylinder 4 so I took it to the dealership to diagnose. It held compression and switched the plugs and still had the same misfire. They said it was a common issue that the lifters go out with the DFM. It only has about 50k miles on it and I am the original owner

Filed Oct 2, 2026 · Engine · OH

I was driving down the highway doing 70mph when my check engine light started flashing. I had to pull over and turn off my truck and turn it back on in order for it to go away. I brought it to the dealership and they explained that I had a misfire on the entire driver side of the engine and I would need to replace it. I have kept up on all of my vehicle maintenance but it still requires a new engine, costing $11,000 if not covered under warranty. This is a known problem with the Chevrolet 6.2L V8 engine and is now a class action lawsuit with the company.

Filed Aug 12, 2026 · Engine, Transmission · 76,000 miles · GA

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the vehicle was running rough and the vehicle lost automotive power. The check engine warning light was illuminated. Additionally, the transmission made an abnormal sound while starting the vehicle and while driving, and the torque converter was shuddering. The contact and his father diagnosed the vehicle as having a cylinder misfire and performed a compression test on the engine. The contact replaced the lifter and push rods, deactivated and removed the Dynamic Fuel Management (DFM), modified the engine, replaced transmission fluid, and used Lube Gard Instant Shudder Fixx for the torque converter shudder. The manufacturer was made aware of the failure. The failure mileage was approximately 76,000.

Filed Jul 10, 2026 · Engine · TX

Dear Sir or Madam, I am submitting this complaint to request that the Federal Trade Commission investigate General Motors (Chevrolet) regarding what appears to be a known engine defect affecting the 2020 Chevrolet Silverado and the company's handling of this issue. I own a 2020 Chevrolet Silverado. In September 2025, when my truck had only 45,494 miles, I experienced an engine misfire consistent with a defect that has been widely reported by other owners. Through my research, I discovered that General Motors was aware of this issue and, rather than correcting the underlying mechanical defect, reportedly issued a Technical Service Bulletin (TSB) instructing dealerships to reprogram the Engine Control Module (ECM) to reduce or mask the symptoms instead of permanently repairing the root cause. Now, less than one year later, my truck is experiencing the same engine problems again. Although my vehicle has relatively low mileage, it is no longer covered under the factory warranty because of its age rather than its mileage. When I contacted Chevrolet Customer Assistance, I was advised to work with my local dealership to determine whether I might qualify for a "goodwill" repair. I do not believe it is fair for consumers to rely on discretionary goodwill assistance when the manufacturer was allegedly aware of a design defect before or during the time these vehicles were sold. Based on my research, properly repairing the underlying cause of this engine failure can cost as much as $15,000. Consumers should not be expected to bear the financial burden of repairing a defect that the manufacturer allegedly knew existed but failed to adequately correct. I respectfully request that the FTC investigate whether General Motors engaged in unfair or deceptive business practices by: Continuing to market and sell vehicles with a known engine defect. Addressing customer complaints with software reprogramming rather than permanently correcting the underlying mechanical issue. Failing

Filed Jul 10, 2026 · Engine · FL

While driving my 2020 Chevrolet Silverado 1500 equipped with the 5.3L V8 engine and Dynamic Fuel Management (DFM), the engine developed an internal valvetrain failure resulting in misfires, rough running, and reduced engine performance. The vehicle was diagnosed by a Chevrolet dealership as having failed lifters associated with the DFM system, requiring major engine repairs and replacement of internal engine components. The failure occurred at approximately 81,000 miles and resulted in the vehicle entering a reduced performance condition, creating a potential safety concern when merging, accelerating, or operating in traffic due to the inability to maintain normal vehicle speed and power. The vehicle was inspected and repaired by an authorized Chevrolet dealer. Research shows numerous similar reports from owners of GM 5.3L and 6.2L engines equipped with Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) systems involving lifter and valvetrain failures.

Filed Jun 11, 2026 · Engine · 107,800 miles · SD

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at 25 MPH, the vehicle suddenly made knocking sounds. The Check Engine warning light illuminated. Additionally, the vehicle experienced rough idling and a decrease in motive power. The vehicle was taken to an independent mechanic, who determined the lifters had collapsed and bent the push rod. The push rod was replaced, but the newly installed part instantly bent. The mechanic informed the contact that the cam needed to be replaced. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 107,800.

Filed Apr 27, 2026 · Engine, Transmission · 70,000 miles · GA

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving 35 MPH, the vehicle shuddered and lost automotive power. The check engine, ABS, and several other unknown warning lights were displayed before an engine misfire. The vehicle regained automotive power before hesitated while depressing the accelerator pedal. Additionally, there was an abnormal humming sound coming from the engine. The vehicle was eventually driven to the dealer where a diagnostic test was performed. The dealer determined there was a lifter failure in cylinder #2, and there was debris in both the engine and transmission, which caused engine and transmission failures. The dealer agreed to a goodwill repair, to cover part of the cost of the repair. The manufacturer was notified of the failure and transferred the contact to the federal safety agency to report the failure. The vehicle was not repaired and remained with the dealer. The failure mileage was approximately 70,000.

Filed Apr 27, 2026 · Engine · 131,000 miles · IA

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving 55 MPH, there was an abnormal sound coming from the engine compartment. The vehicle lost automotive power with the check engine warning light illuminated. The contact stated that there was bluish-gray smoke coming from the rear of the vehicle. After releasing the accelerator pedal, the vehicle stalled. The contact restarted the vehicle, but the sound became louder. The vehicle was towed to an independent mechanic, where it was diagnosed, and metal shavings were found in the engine oil. Additionally, there was a misfire in several cylinders, the camshaft not operating properly, and the engine needed to be repaired or replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 131,000.

Filed Apr 20, 2026 · Engine · NY

September 2020 received new vehicle ( purchased platinum extended warranty at time of sale that expires 9/22/2027)-December 2022 heard loud ticking & misfires & check engine light on took to dealer who found #2 cylinder intake lifter collapsed at that time was under warranty (9924 miles) and dealer replaced not only damaged lifter but all lifters and guides (I have this repair invoice from 12/2022) On March 31 2026 (19,000 miles)ticking came back took silverado to dealer to be checked 4/3/26 they kept truck and had to take top of engine apart where they found that the #2 cylinder lifter has collapsed again the technician went ahead & replaced lifter before getting authorization from warranty company, GM or us to do repair dealer told us that they can put old damaged lifter back in truck & we can take truck back if we want- we are waiting for the inspector that warranty company wants to send to inspect the truck they still have truck 2 1/2 weeks later the warranty company wanted to see all receipts & log for all 7 oil changes which i gave to dealer 4/13/26 was passed to warranty company who accepted all & they want to send an independent inspector to see truck on 4/20/26 we are waiting to hear if he came This is a serious safety issue as this engine 6.2 (L87) Z71 has been prone to lifter failures since 2019, we only found this out now when the same lifter collapsed a second time & that this engine has been known to shut engine down while driving & severely damaging it & even possibly causing an accident If we get no satisfaction from dealer or warranty company as a next step we will be asking for a GM regional representative to come inspect the truck see the repeat lifter failure, open a case with a corporate representative & look into the Lemon Law as this is a recurring issue-- it also affects the value & resale value of our Silverado

Filed Apr 10, 2026 · Engine · TX

I am reporting a failure involving a 2020 vehicle equipped with a GM 6.2L V8 engine that developed a cylinder 8 misfire along with diagnostic trouble codes P0300, P0500, and P0521. Dealer inspection revealed a severely scored camshaft and metal debris present in the engine oil, indicating significant internal engine damage. The failure appears to be related to a lifter or valvetrain malfunction, leading to improper valve operation and engine misfire. This issue occurred unexpectedly and creates a serious safety concern due to the risk of sudden engine failure during operation. This may be associated with known problems affecting this engine type and should be investigated further.

Filed Dec 16, 2025 · Engine · 96,000 miles · NM

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving approximately 65 MPH, the vehicle started to hesitate with several unknown warning lights illuminated. The contact stated that there was a misfire in the engine, and her husband pulled off the roadway and turned off the vehicle. The vehicle was restarted and driven back to the residence at speeds no greater than 50 MPH. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the left engine lifters had collapsed and needed to be replaced. The contact was advised by the dealer that the right-side engine lifters should be replaced while the engine was disassembled. The vehicle was not yet repaired. The manufacturer was informed of the failure. The failure mileage was approximately 96,000.

Filed Nov 11, 2025 · Transmission · OK

The transmission quite working while I was driving down the road. Took my foot off of the gas pedal and my truck bogged down completely and had no power to it. It is at an auto repair shop so I am unaware if it could be inspected under request. Took time but was able to safely get off the roadway and out of traffic. It did the out of no where. Started having some issues this summer but no warnings lights ever came on, so I didn’t think much about it. Completely stopped in the middle of the road and had little to no power from the transmission to the truck to move off of the road. My truck is currently in an auto repair shop waiting on a new transmission to be installed. I had it towed to an independent auto shop from where it stalled. There were not warning lamps or anything at the time of my transmission quitting. Truck started to run rough and shifting hard this summer but without warning lamps I didn’t take it anywhere. When running on the interstate it was shuttering which I thought was due to possible tire out of balance. It would also hesitate to take off when put into drive. It had several of the same issues that Chevy had on other transmissions that were recalled within this same time frame.