Incident: Twice our Chevrolet Silverado 2020 Duramax has experienced while operating, sudden with no warning "reduced engine power" and "check engine light" the engine sounds very different and does not operate as it should and presents a safety issue when you are driving and traveling at a high rate of speed. These incidences occurred on 10-4-2026 and 10-23-2026. The vehicle experienced a sudden failure of the engine coolant control valve, triggering Diagnostic Trouble Code P1006. This component failure restricts proper engine thermal management and poses a risk of sudden engine overheating while driving. General Motors has formally acknowledged this identical part failure as a chronic manufacturing and safety defect via Special Coverage Bulletins N252508341 and N252508340, which extend warranty coverage to 15 years/150,000 miles. However, GM has arbitrarily excluded the 2020 model year from this coverage, despite the vehicle utilizing the exact same defective part assembly number as the covered 2021-2023 models. This identical component failure across model years constitutes an unaddressed defect pool that requires immediate regulatory expansion to protect consumers from unsafe engine component failure. please fix this situation TY
2020 Chevrolet Silverado 1500 engine problems
272 complaints (36% of all complaints for this car). Typical mileage when it fails: 68,000.
- owner complaints
- 272
- of this car's complaints
- 36%
- typical mileage
- 68,000
- crashes
- 0
- recalls
- 0
Which part fails
- Exhaust system: emission control: urea injection system (DEF)1
- Exhaust system: emission control1
- Engine: crank/camshaft position sensor1
At what mileage
Complaints by mileage at the time of the problem.
Chevrolet Silverado 1500 engine problems in other years
Specific symptoms reported on the 2020 Chevrolet Silverado 1500 engine
Phrases found in the owners' own descriptions, so one complaint can mention several symptoms.
Check engine light 142Engine failure 75Loss of power 70Knocking 41Misfire 28Stalling 27Won't start 15Overheating 12Oil consumption 5
Related recalls
No recalls on record for this model year.
Related investigations
Loss of motive power due to engine failure
The Office of Defects Investigation (ODI) has received 1,157 reports of engine bearing failure failures in the L87 6.2L engine produced by General Motors (GM). Of the 1,157 reports received, 173 are outside of the scope of recall 25V‑274. These engines are installed in Model Years (MY) 2019â2024 Chevrolet Silverado 1500 and GMC Sierra 1500, and 2021-2024MY Chevrolet Suburban and Tahoe, GMC Yukon/Yukon XL, and Cadillac Escalade/Escalade ESV vehicles. The subject engine failures were investigated as part of a Preliminary Evaluation (PE25001). GM determined that these engine failures were due to multiple supplier manufacturing and quality issues. GM issued recall 25V‑274 to address the supplier manufacturing and quality issues produced between March 1, 2021, and May 31, 2024. Based on the issuance of recall 25V‑274, the federal safety agency has closed PE25001. ODI continues to receive a significant number of reports of engine failure in vehicles outside the scope of 25V‑274. This presents a potential safety risk that warrants further investigation. ODI is opening this Engineering Analysis (EA) to further evaluate the scope and severity of the potential problem and to fully assess the potential safety-related issues of vehicles built outside the recall scope. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to
EA25007
Loss of motive power due to engine failure
On January 16, 2025, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE25001 after receiving complaints and field reports concerning engine failures in MY2019-2024 GMâs full-size truck and SUV T1XX platform equipped with the L87 6.2L V8 engine. These complainants alleged engine bearing failures resulting in knocking and growling noises from the engineâs bottom end and in some cases more severe consequences such as broken connecting rods leading to engine damage, or engine failure. If the engine fails during vehicle operation, the vehicle will lose propulsion, increasing the risk of a crash. On April 24, 2025, GM issued recall 25V‑274 to address the concern with L87 engines produced between March 1, 2021, and May 31, 2024. GM cited the root cause as a supplier manufacturing and quality issues. GMâs recall remedy will be either an oil change to an oil with a different viscosity or engine replacement depending on the results of the remedy inspection procedure. To date, ODI has received 1,157 allegations of engine bearing failure. GM submitted 55,464 reports in total, with 29,752 unique VINs. ODI continues to receive allegations of L87 engine failures which fall outside of the scope of recall 25V‑274. Based on GMâs recall, ODI will close this PE. the federal safety agency will continue to investigate complaints of engine failure outside the scope of recall 25V‑274 as part ofEngineering Analysis (EA25007). To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to
PE25001
What 2020 Chevrolet Silverado 1500 owners say
Most recent owner complaints, unedited.
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
I was driving the vehicle at around 50MPH after leaving a set of traffic lights when the engine lost all power and a series of warning lights came on. I pulled over safely to the side of the road and had the vehicle towed to a local vehicle mechanic shop. On investigation the engine had seized and a number of internal components had failed. The engine/vehicle I have owned since new and had approximately 103000 miles on it at the time of the incident.
The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that the engine was previously rebuilt. While driving at an undisclosed speed, the vehicle jerked and lost motive power, with several unknown warning lights illuminated. The vehicle was pushed to the side of the road and towed to an independent mechanic, who determined that the engine had low compression, and that the engine and transmission needed to be replaced. The manufacturer was notified of the failure by phone. The failure mileage was approximately 140,000.
The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving 65 MPH, the engine lifters failed to operate as intended. Additionally, the lifters were replaced three years prior to the failure reoccurring. The dealer was contacted and the vehicle was diagnosed with lifter failure. The manufacturer was contacted by phone and made aware of the failure. The failure mileage was approximately 120,000.
The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving, the vehicle was shuddering. The vehicle was taken to the dealer and was diagnosed with transmission failure. The contact was informed that the torque converter and transmission needed to be flushed. While driving approximately 30 MPH, the vehicle was shuddering and the transmission seized, with the check engine warning light illuminated. The failure had occurred briefly, and the failure was self-corrected, and the contact continued driving. The failure reoccurred approximately 2 - 3 times. The vehicle was returned to the dealer, and the transmission was replaced. The failure persisted, and the vehicle was returned to the dealer, and the transmission was replaced a second time. The vehicle was returned to the dealer, who was unable to diagnose or repair the vehicle. The contact drove the vehicle an additional 20,000 miles before the vehicle received additional repairs. The manufacturer was informed of the issue several times. The failure mileage was approximately 73,000.
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.
Vehicle is hard shifting and has the following error codes. Engine P0700 Transmission Control Moduel Requested, test not passed Transmission P0747 Transmission control solenoid Valve 1 stuck on- Test failed. Warning indicator requested. Very concerned to be driving this vehicle.
have notice that the car jerks hard from time to time and when try to accelerate the car does a quick/short stop then accelerates hards very jerky. Also I smell coolant and my check engine light came on..
Motor blew up. 6.2 L87. 2020 silverado 90000 miles, this will be the 4th motor
Questions about the 2020 Chevrolet Silverado 1500 engine
Does the 2020 Chevrolet Silverado 1500 have engine problems?
Owners have filed 272 complaints about the engine of the 2020 Chevrolet Silverado 1500, 36% of all its complaints, more than any other problem.
At what mileage do 2020 Chevrolet Silverado 1500 engine problems start?
The typical (median) mileage in owner complaints is 68,000 miles.
Was there a recall on the 2020 Chevrolet Silverado 1500 engine?
There is no recall for this problem on this model year.
What year does the Chevrolet Silverado 1500 have bad engine?
The Chevrolet Silverado 1500 model years with the most engine complaints are 2021 (453 complaints), 2019 (424 complaints) and 2022 (281 complaints).
Other 2020 Chevrolet Silverado 1500 problems
Transmission 239Brakes 118Electrical 118Steering 74Fuel system 41Acceleration 28Driver assistance 27Body 26Suspension 20Wheels 14Lights 12Visibility 12Airbags 11Locks 6Seat belts 5Tires 4Seats 2
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