general problems of the 2020 Chevrolet Silverado 1500 - part 2

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.

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.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while his son-in-law was driving 61 mph, the vehicle made an abnormal clanking sound and stalled. The driver pulled over safely. The onstar mobile app alerted the driver of an issue with the vehicle. The contact stated that the vehicle was making an abnormal ticking sound prior to the failure. Upon arriving to the location of the vehicle, the contact noticed an oil leak underneath the vehicle. The contact stated that he was a certified mechanic, and the vehicle was towed to the contact's auto repair shop, where the contact determined that the rod had gone through the engine block. The contact called an unknown local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 80,000.

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.

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.

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.

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.

I have 2020 chevy 1500 with l87 engines on it. We have the exact same issues that the 2021 1500 recall is having. Loses power, noisy engine when at start. Paradise Chevrolet in temecula told me that they were going to replace the engine per gm but then gm only auth the repair. 8 barring kits, 8 rings 8 piston kits lot of bolts and gastkit and seals. Talked to gm every tho it’s the same engine they won’t replace it since not on recall. Don’t understand how the same engine in a car one year before the recall. I have all the paperwork video of the noise pictures of the pistons. I failed from the dealer. Had to get the truck towed to the dealer cause the car wouldn’t turn on and all this happened with only 68,833 miles.

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.

Lifter failure.

On September 27, 2025 while driving to my nieces soccer game my 2020 silverado traill boss lt started losing power while driving. I was at a red light when I felt the truck not properly responding to me pushing the gas pedal once it turned green. It slowly started accelerating and then with all the lights still illuminated on the dash, the truck completely stopped working with no response to the gas pedal. I had to let the truck coast forward while driving through an intersection. Thank god there was not that much traffic behind me and any cross traffic. I managed to pull the truck over stuck on the side of the road. My wife had to get a ride from a family member to reach the destination while I had to call a tow truck and have it towed home. Ironically, I believe the truck had just got out of warranty, what a complete waste of thousands of dollars including the warranty that is always useless. I did not reach out to the dealership because I knew it was going to cost me an arm and a leg just for a diagnostic only for them not to find a problem. There was no warning light flashing to notify me that my truck was taking a dump or any error code of any sort for a diagnostic to pinpoint the issue. I am surprised this has not turned into a class action lawsuit (not yet anyways). My father made me a Chevrolet person but with all the recent engine/powertrain problems with general motors. I always believed the slogan "the longest lasting dependable trucks on the road". Tanks to youtuber "@donslife" for keeping the public informed of all the latest updates with all these issues. This might be my last Chevrolet ever unless they could fix these issues and take some type of customer reimbursement/assurance/future or current incentives.

Engine idling rough shaking stalling loss of power.

After completing a gm assisted engine rebuild the transmission oil pump is failing and transmission shifting era tic.

Engine shut off while driving and was unable to restart.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving 55 mph, several unknown warning lights illuminated. The vehicle was towed to the dealer where it was diagnosed. The dealer became aware of an abnormal sound coming from the lifters and camshaft, which failed to create a misfire. The contact was informed that the engine needed to be replaced. The vehicle was not repaired due to the cost. The manufacturer was not notified of the failure. The failure mileage was approximately 68,000.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at a moderate speed, the fuel warning light had appeared on the instrument panel. After fueling the vehicle at a gas station, the vehicle began to hesitate while depressing the accelerator pedal, with several warning lights, including the "engine power reduced" and "service esc" illuminated. Due to the failure, the contact had the vehicle towed to a dealer. The dealer informed the contact that the starter needed to be replaced because the vehicle had failed to start. The mechanic performed a diagnostic test and discovered that the fuel injectors were defective and leaking fuel into the engine. The mechanic diagnosed the vehicle with engine failure and provided the contact with an estimate for repair. The manufacturer was notified of the failure but offered no assistance. The contact was then referred to the NHTSA hotline to report the failure. The vehicle was not repaired. The failure mileage was approximately 68,000.

Coolant control valve failure. Dealer inspected vehicle and it was confirmed that it needed to be replaced. Check engine light came on fan started spinning at a high speed and the vehicle went into low power mode. When I spoke with the dealer, this is a known issue so much to the point where the cooler control valve is on backorder and I’ve had to wait for over a month now. Projected cost to replace with labor is over $3000.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, there was a loud knocking sound coming from the engine compartment, and the vehicle shook violently, with several unknown warning lights illuminated. The vehicle was taken to the dealer, where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to the NHTSA hotline for further assistance. The failure mileage was approximately 84,000.

While driving the active fuel management changed my truck from 4 cylinders to 8 cylinders. This is when I heard a loud bang and a bunch of lights came on the dash and my truck started shaking and shuttering. I was able to regain control of it, but I came close to crashing. I now require a whole new engine at 100000 miles. After talking to multiple shops this KS a known issue. While they dont always catastrophic fail, mine did and almost cost me to crash. This is a serious safety concern.

Truck experienced reduce power mode. Took to have codes ran and it showed 24 separate codes when engine light comes on. While riding down the road, truck will go into reduce power mode, shift automatically into 4x4, and several other notifications will appear. Taking to dealership and was told the electrical wiring harness was shorting out causing this issue. Cost around $700 for repair, happened one month later, took it back and no charge for the 2nd time. It is currently in reduced power now. Dealership stated to replace the wiring harness would cost over $3,000. Dealership stated this was a manufactures defect, but no recall was issued so all cost is on the owner.

I was on a trip to iowa and noticed a loud ticking noise starting in my engine. There was no warning lights on the dash to indicate any problems. I checked the oil and notice it was not registering on the dip stick. I added over a quart of oil and the noise continued. My truck was just at a dealer 2 weeks prior for an oil change and they noted that everything was good and in proper working order. No leaks or no other issues. I set up an appointment at a chevy dealer at the destination which I was traveling to for a check up. About 60 miles from the dealership, my check engine light went on. I immediately stopped and checked all my fluids which were showing normal ranges. I dropped my truck off for inspection and they advised me that my lifters need to be replaced. I authorized the repair and after the new ones where installed, they tested my truck and noticed that there was still a ticking noise coming from the engine and was not holding any oil pressure. They advised me that the motor needed to be replaced at a cost of almost $15,000. I will request all pictures and videos taken by the dealership for further inspection if needed.

While driving in southern utah my truck gave me a service esc (electronic stability control) warning, service parking brake warning, and check engine light that was for code p0303. I had the vehicle towed to the local Chevrolet dealership and it was diagnosed with lifter failure and camshaft damage because of the lifter failure. Safety was compromised because of the failure of the esc and the loss of power and stability of the engine. I didn't receive warnings prior to the failure. This appears to be a well-known issue with several service bulletins issued for the vehicle.

My problem is the same as many others with the 3. 0 duramax engine. I h e the p0016 code indicating the the timing chain that can cost up to $10k and sudden engine failure if not repaired. My vehicle is only 5 years old and has 98k miles at the moment.

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.

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.

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.

Lifter failure and miss fire.

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.

Motor suddenly loss power and load knocking noise. After taking it to the dealer they said that number 3 cyl. Connecting rod had an issue . This sounds like the same recall for the 2021 to 2024 6. 2 engines. They gave me a quote for a new engine ( 20000) that was not available for 4 to 5 weeks if not more. I was on vacation at the time and ended up buying a new truck from them. I was not happy.

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.

I was driving and came to a stop at a red light. When accelerating on green the transmission would not go into gear, stalling my vehicle. Nearly causing the vehicle behind me to rear end me. The vehicle eventually went into gear and started to slowly accelerate with shuttering of the transmission.

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.

After three oil leak repairs in my lm2 3. 0 diesel engine in my 2020 Chevrolet silverado rst, you would think that would be enough to repair the manufacturer's defects, but it wasn't. I think the saying is fourth time is the charm? the third repair which was a second oil pan lasted a whopping 48 hours before leaking. This time it ended up being the timing chain cover that was leaking. Again, the service advisor mentioned that these are known to leak too due to a defect from the manufacturer. I even got a call from the service manager, and he said that anything area that could and does leak oil on these lm2 engines has been replaced and/or repaired, so I should be good for the future. I called into gm as per their instructions to update them on the fourth oil leak, and where the repairs were taking place. Fast forward to nearly two months later, and no one from gm attempted to contact me, and jill stated that the case was closed and wouldn't disclose why. The only thing she could do was open another case. I declined since gm couldn't be bothered to address the issues they know they have in the lm2. The dealership the work was done in, the service advisors, the service techs, and the service manager all discussed in great detail the issues Chevrolet is having with the 3. 0 diesel engine. Gm knows this and refuses to address this. At this point, my vehicle spent 37 days in 2. 5 months at the dealership fixing oil leaks that at any time could have caused engine failure and resulted in a crash. This truck is our dedicated family vehicle as my wife and I each daily Subaru wrx's. Gm has done nothing and will do nothing. Someone needs to issue recalls to address the oil leak issues with the lm2 before it results in someone's death. I wish I wouldn't have wasted time contacting gm. I should have filed these complaints and got legal representation for the magnuson-moss warranty act. * loaner vehicle was given during the entire 37-day repair duration. **.

Was driving on highway and vehicle went into "engine power reduced" and dropped from 60mph down to 35mph and then steadily decelerated down and wouldn't go over 18mph. Per mechanic it is the engine coolant control valve and the part is not available and could be months to a year before the part is available. Online shows this is a widespread issue with gm / chev vehicles but no recall has been ordered and parts not available anywhere. Completely unacceptable to pay $65000 for a vehicle that is just barely 5 years old and have this kind of issue and manufacturer doing nothing about it.

The second oil leak repair and the first repair for the oil pan failed within one week of the previous repair. This is the third oil leak that occurred in the lm2 engine in the 2020 silverado. It was identified as an additional leak in the oil pan which had already been repaired the week prior. This is a failure within seven days from the previous repair. I lost 1/2 quart of oil during a 650-mile drive back from vacation. I took pictures of the oil level before leaving and driving home. During our drive, we passed through an area called yermo where it was 107 degrees at 11am. The two closest Chevrolet dealerships are either 45 minutes or 1. 5 hours one-way. I was incredibly frustrated since imagine being stranded in 107-degree weather with your family on the side of the road unable to run ac. It is a serious life, health, and safety issue at this point. I called gm and opened a case expecting them to assist me with the issues with the truck. Fast forward to today, I spoke with jill at gm, they closed the case without even reaching out to me. This was the third of four oil repairs that have been conducted on my vehicle and the lm2 engine. It isn't a safe engine to have. * loaner vehicle was given during the repair. **.