*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Engine
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…
Oct 23, 2026Electrical system
Truck would not start - it left me stranded. The main body to engine ground strap had rotted off. I found there is a Chevrolet Customer Satisfaction Program (N252515590) for ground straps rotting for the same make/model/year as my vehicle, but for some reason mine isnât listed by VIN number in the program.
Oct 23, 2026Service brakes
It said on the dash, "Brake System Failure 43MPH Top Speed," "Service ESC," and lights on were the ABS light, BRAKE light, Engine Light, and Wheel Traction light. My wife and my [XXX] son's safety were at risk while driving on a busy 75mph highway and trying to turn around and make it home as the brakes did not work and having to cross busy streets. It was not able to reproduce but my local mechanic found the bulletin from way back that had not been addressed by GM after numerous times to a dealer for other repairs. I then took it to a local GM dealer that confirmed software update was not applied and they did the repair and I was charged to pay even though this was a known GM issue that…
Oct 17, 2026Power train
Transmission started slipping for no reason around 100 thousand miles. All maintenance had been done no code was ever shown on dash no check engine light took it to 3 different places and had it tested all said the same thing they couldn't find anything wrong. Now its sitting at the shop and they are saying its the Transmission and it needs a new one.
Jul 4, 2026Unknown or otherFire
We were traveling at approximately 65 miles per hour while towing our Coachmen Apex travel trailer with our 2020 Chevrolet Silverado 1500 LT equipped with the 3.0L Duramax diesel engine. During travel, we heard a loud popping sound originating from beneath the hood. There were no warning/engine lights or smell. Immediately afterward, we observed substantial smoke billowing from the front of the vehicle.We pulled off the highway as quickly as possible. Smoke began entering the passenger compartment through the ventilation system, and we observed flames beneath the hood. Recognizing the immediate danger, we evacuated the vehicle and removed our dog. We attempted to extinguish the fire using a…
Oct 18, 2026Engine
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
Oct 12, 2026Electrical system
1. Transmission Issue: Since purchasing the vehicle, I have experienced ongoing transmission problems. The transmission exhibits noticeable shifting issues, including delayed response, harsh/rough gear engagement, and erratic shifting behavior while driving. 2. Intermittent Electrical & Sound Failure: In addition to the transmission issue, the vehicle has developed a severe intermittent electrical malfunction. Without warning, all audio and electronic sounds in the cabin completely turn off ("go mute"). This includes the loss of interior warning chimes, system alerts, and the audible turn signal clicker. The system restores itself randomly ("goes back when it wants to"), making the issue…
Oct 1, 2025Power train
The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while attempting to reverse at an undisclosed speed, the vehicle accelerated independently. The check engine warning light and transmission warning light illuminated. The vehicle was towed to a dealer, where it was diagnosed that the engine and transmission required replacement. e. The failure mileage was unknown.
Oct 19, 2025 · 60,000 miles
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.