2020 CHEVROLET SILVERADO 1500 Complaints

Initially, turbo charger issues. Dealer after 2 weeks corrected issues with the turbo charger. We were provided loaner. Dealer took 28 days, the second time, to supposedly remedy Transmission/shifting issues. First we were told it was a valve port body. Then we were told they had to remove the pan, etc., all part of the process. Then the parts were on backorder. Finally, at the 11th hour, they installed a rebuilt transmission. Without a loaner for 2 weeks. Got the truck back and within 24 hours, the truck suddenly lost power steering while driving around curve at aprox.30 to 35 mph., check engine light on, power steering light on, trailer brakes warning light on, etc. Had it towed back to dealer in the morning and told it would be a priority. Called at 5pm. Truck has not been seen. It's not a car. It's a work truck. Seems the dealership is swamped with silverado trucks with similar transmission issues waiting for valve ports. No loaner vehicles to be had the second time after 2 weeks. Not sure what they will tell us tomorrow.

Having failure with the engine coolant control valve. Have taken my truck to the dealership for overheating and they always come and say that they can’t find an issue. They also informed me that I need to bring it back when my motor blows a head gasket which is complete bull.

Lifter failure on the 5.3L L84 engine. Due to Dynamic fuel management that come with the trucks.

There is an issue with the wiring harness that causes vehicle to lose power. Dealership says manufacturer defect because designed with harness cover is too thin and is to close to engine so burns wires. Many other users have complained of this issue and is frequent in this model.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while at a complete stop and depressing the accelerator pedal, the vehicle jerked. The check engine warning light was illuminated. The vehicle was taken to an unknown dealer, where it was diagnosed that the transmission was shifting hard. The vehicle was not repaired. The manufacturer was notified of the failure and the contact was informed that the vehicle was out of warranty. The contact was referred to the NHTSA Hotline to file a vehicle safety complaint. The failure mileage was approximately 40,000.

About 3 months after the 5 year 100000 mi warranty with only 70000 miles on the duramax diesel engine the exhaust brake part of the engine emissions/exhaust split along the weld. Have seen a number of these reported on the internet as well. Sounds like a manufacturing problem. The vehicle's check engine light came on and it's now at the dealership getting a new exhaust brake housing and bracket replaced. If this was in California or the 12 states listed would be covered for 8yrs/100000 miles.

Engine seized my truck has been at the Chevorlet Tempe dealership I filed a claim with GM still no response.

I had the lifters and camshaft fail in my truck as a result of the faulty fuel management system GM put in these trucks during these years of manufacturing. I was driving my kids to an appointment when they failed in the middle of the highway, leaving the truck unable to run. I have reported the problem to the dealer as well as reported to GM directly. I have spoken with 3 different garages, all of which have made it a point to tell me this is a common issue in these trucks. Prior to this happening, there were no lights on to warn me of this problem. The repair cost is $12,000 and that is to put the same parts in the failed the first time. I don’t know many consumers that can afford the costs of these repairs when GM knows this is an issue but refuses to do anything about it.

My 2020 Chevrolet Silverado 1500 LT with the 3.0L Duramax diesel engine has experienced three separate failures of the coolant control valve over a span of less than two years. Each failure resulted in the vehicle entering reduced engine power mode, which drastically limits acceleration and the ability to maintain safe driving speeds — particularly dangerous on highways or in heavy traffic. Chronology of Failures: October 2023: First coolant control valve failure. Part was backordered. Repair took ~6 weeks. June 2024: Second failure of the same part. Another 6-week delay in repair due to part availability. June 2025: Third failure of the same part. Vehicle is currently inoperable and unsafe to drive. Each time, the failure triggered a check engine light and immediately placed the truck into reduced power mode. This issue significantly compromises driver safety, especially in high-speed or congested environments, where limited acceleration can increase the risk of collisions. Safety Concerns: Loss of acceleration power at critical times (merging, overtaking, etc.) Unpredictable vehicle behavior Extended unavailability of parts leads to prolonged periods without a functional vehicle Possible underlying design flaw or recurring part defect Given the recurrence, safety risks, and the number of similar complaints I have seen from other owners, I believe this is a widespread and systemic defect that deserves NHTSA investigation. Requested Action: I urge the NHTSA to investigate the frequency and root cause of coolant control valve failures on the 3.0L Duramax engine in the 2020–2022 Silverado models. This is not an isolated incident, and repeated failures of a critical engine cooling component warrant a safety recall or technical service bulletin (TSB) requiring redesign or replacement with a permanent fix.

Transmission is sputtering when trying to shift. Mostly at low speeds it's extremely jerky like it doesn't want to go. Had Transmission fluid and filter changed, but it did not help.