2021 Chevrolet Silverado 2500 Problems

My 10L1000 transmission had a catastrophic failure internally which caused it to rough shift, sudden down shifting, not want to shift into gear at all, and high engine rpm prior to roughly shifting. I took it to the Chevy dealers mechanic the very next business day, only to find out that from the mechanic that this is a common occurrence with Chevy transmissions in my truck and google also verified this to be a common problem. The mechanic from the Chevy dealership also stated that there was larger metal chunks than normal. My truck is available for inspection asap. The manufacturer and vin lookup contradicts the mechanic and google stating no issues or recalls for my transmission. After speaking with the manufacturer, I became highly concerned due to their unwillingness to address the obvious issues known by so many. If I wasn’t such a safe driver and immediately brought it to the mechanic, this could have caused a terrible accident leading to extreme bodily harm or death even. According to a quick google search of the 2021 Chevy 2500 transmission problems and my mechanic this is a well known problem even though Chevy manufacturers refuse to acknowledge the issue or implement a recall. There was zero warning lights or lamps to indicate this problem. I am extremely concerned with the manufacturer’s response to my concerns and their unwillingness to correct this issue before it cost someone their life. This catastrophic failure with the transmission having metal shavings throughout it and extreme damage to the transmission valve body and being well known and reported by many other customers has to be addressed. Chevy’s unwillingness to acknowledge people’s claims in this has left me with around $10,000 in monetary damages and could have lead to bodily harm or death if I would have been traveling on a main highway or interstate when it occurred. At the very least Chevy needs to be held responsible for this known and reported issue before it causes death or injury.

Operator of this vehicle was commuting and truck started to slow down and chug. Vehicle hesitated when operator applied gas pedal. -Transmission cooler inlet/outlet pipe as per Chevrolet known issues. -Safety of driver at risk as failure happened in heavy traffic, unable to pull to safety -Yes confirmed by authorized repair facility -Part inspected by authorized mechanic. -No warnings, symptoms, prior to failure.

The contact owns a 2021 Chevrolet Silverado 2500. The contact stated that the connector for the heater system was causing the vehicle to overheat, subsequently enabling the vehicle to go faster than 50 MPH. If the vehicle reaches 75 miles, it would immediately decrease in speed to 5 MPH. The vehicle was taken to a certified mechanic who diagnosed a P20C1 code, indicating reductant heater failure had occurred. The vehicle was not repaired. The contact called the dealer, who recommended calling the NHTSA Hotline to file a safety complaint. The manufacturer was informed of the failure they also referred the contact to the NHTSA Hotline to file a safety complaint. The failure mileage was approximately 68,000.

We believe that it is the park sensor in the column . When you place the truck into park, the screen displays the words shift to park period and the dinger.Inside the truck continues to ding for a long time, even with opening and closing the door ... The truck is actually in park, so it does not move.But the display says it's not.And apparently it is not registering because it keeps dinging

What component or system failed or malfunctioned, and is it available for inspection upon request? - The parking brakes were engaged and would not release / yes, it is available for inspection How was your safety or the safety of others put at risk? I was in traffic stopped at a train track and could not move. Has the problem been reproduced or confirmed by a dealer or independent service center? - Yes, the rear actuator for the brakes was faulty and had to be replaced. The warranty work was completed by the dealership Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? - Unknown Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? - Not prior to the problem My concern is that my parking brakes "were nonexistent" per the dealership when they were diagnosing the warning light. So, I am afraid that the truck was driving while these were engaged.

On 01/16/2026, Quirk Chevrolet completed product safety recall N242482680 for the Brake Pressure Switch Connector Fire on my vehicle. Shortly after, my vehicle would come to an abrupt stop on its own while driving. This happened twice on my way home and then the third time at home at which point, it would no longer move forward or backward. The vehicle needed to be towed to the dealership that did the recall. After researching online, I discovered this is a known issue after the recall because the recall component is faulty. One source reports the cause is an improperly manufactured jumper harness which is missing protective tape or a faulty internal C-clip in the cylinder. Another source states the post-service emergency brake issues often stem from a software update meant to enhance safety or an incomplete repair of the brake pressure switch wiring harness. The update automatically engages the parking brake. I absolutely know that the catastrophic failure of my vehicle's braking system was a direct result of the recall work; however, the dealership made me pay for the repairs out of pocket until such time as GM or Chevy makes an "official" recall on the faulty recall. My safety and the safety of others was put at risk by way of my vehicle stopping abruptly on its own. The problem has been reproduced by many sources online - just do an online search "2021 Chevy 5500 emergency brake issue after brake recall completed" and see all the results that come up corroborating my personal experience. Quirks Chevrolet in Manchester, NH inspected the vehicle. No warning lamps or messages appeared on the dash. Please contact me if you want any additional information or copies of receipts, etc. My vehicle is available for inspection upon request.

The contact owns a 2021 Chevrolet Silverado 2500. The contact stated that the electronic tailgate door had erroneously opened and closed and also, moments after turning the vehicle off the door had erroneously opened. The cause of the failure was not yet determined. The manufacturer was notified of the failure. The contact was informed that the VIN was not included in the NHTSA Campaign Number: 24V060000(LATCHES/LOCKS/LINKAGES). The contact indicated that the vehicle had experienced that same failure listed in the recall. The failure mileage was 47,000.

The contact owns a 2021 Chevrolet Silverado 2500. The contact stated while the vehicle was turned off and shifted into park, the tailgate opened independently. The failure occurred frequently, and the contact removed the fuse to prevent the tailgate from unlatching independently. The contact stated that the failure only occurred while the vehicle was not in drive. The dealer had been contacted and notified of the failure. After researching the failure, the contact became aware of NHTSA Campaign Number: 24V060000 (Latches/Locks/Linkages); and related the failure to the recall. The dealer confirmed that the VIN was not included in NHTSA Campaign Number: 24V060000 (Latches/Locks/Linkages). The vehicle was not repaired. The manufacturer was informed of the failure, and a case was opened. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was unknown.

first issue was around April-May 2025 when my engine started knocking and burning fuel. Warning light came on and it went right in to the dealer where I have all my maintenance done. They determined that it due to (2) faulty fuel injectors and I had them replaced at that time. In December of 2025 my engine started doing the same thing as before with the knocking and burning fuel and reduced speeds when on the highway so again it went into the dealer. It has since been in there and first was told it was the fuel injector again. They priced out the one was bad and I asked them to replace the remaining 6 fuel injectors so I didn't have this issue again in the near future. They did and the vehicle had the same issues going on. During the next inspection it was determined that the engine needed new rocker arms. These were replaced but this also did not solve the problem and the vehicle would not pass the regeneration on the engine. During the next inspection it was determined that we needed to replace a cylinder and one of the valves. After this was complete they were still having issues and then I was told that the Piston was bad and there are (2) bad valves so I need an entire engine replacement. My truck only has 130,000 miles and has been in the shop for almost 2 months last year from engine issues and it has had all maintenance completed at he same dealership with Records.

I own a 2021 Chevrolet Silverado 2500HD Duramax diesel with approximately 100,300 miles. The truck began displaying a “Service Emissions System” warning and a countdown message that in a certain number of miles the vehicle will be limited in speed (for example to 65 mph). GM’s own Duramax diesel owner’s supplement explains that when a “Service Emission System” message appears it is accompanied by a distance-until-speed-limit countdown and that the truck will progressively limit speed first to about 65 mph and then to about 55 mph if the condition is not corrected, telling the owner to see the dealer. This creates a safety risk because the derate can occur while driving on highways or rural roads, where an unexpected limit on maximum speed can interfere with merging, passing, and keeping up with traffic. This is our only vehicle, and we must use it for important medical appointments, including cardiology and surgery-related visits. The condition started only about 300 miles beyond GM’s 5-year / 100,000-mile powertrain warranty. I opened a case with Chevrolet / GM Corporate (Service Request No. XXX) and took the truck to Sons Chevrolet in Columbus, Georgia on November 17, 2025 for this issue and a rear wheel lockup recall. The dealer kept the truck from about 9:00 a.m. to 3:00 p.m. and indicated they might need to keep it for at least two more days, but I was not given a clear written explanation of the diagnostic trouble codes or a firm repair plan. Because GM’s own manuals describe this “Service Emission System” message together with speed-limit countdowns, and because the vehicle can actively limit speed on the road if the fault is not resolved, I am concerned this represents a broader emissions/derate defect on late-model Silverado HD Duramax trucks. I request that NHTSA review similar complaints and consider whether further investigation or a safety recall is warranted. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Similar to the issues that were on the gas version of this engine and the recall associated with it. The engine seized on the expressway. When it was towed to the dealership, they said it was catastrophic engine failure. They found a lot metal shavings in the oil pan. They did not diagnose any further due to cost. At the time it happened, there were no warning lights or check engine lights on.

first issue was around April-May 2025 when my engine started knocking and burning fuel. Warning light came on and it went right in to the dealer where I have all my maintenance done. They determined that it due to (2) faulty fuel injectors and I had them replaced at that time. In December of 2025 my engine started doing the same thing as before with the knocking and burning fuel and reduced speeds when on the highway so again it went into the dealer. It has since been in there and first was told it was the fuel injector again. They priced out the one was bad and I asked them to replace the remaining 6 fuel injectors so I didn't have this issue again in the near future. They did and the vehicle had the same issues going on. During the next inspection it was determined that the engine needed new rocker arms. These were replaced but this also did not solve the problem and the vehicle would not pass the regeneration on the engine. During the next inspection it was determined that we needed to replace a cylinder and one of the valves. After this was complete they were still having issues and then I was told that the Piston was bad and there are (2) bad valves so I need an entire engine replacement. My truck only has 130,000 miles and has been in the shop for almost 2 months last year from engine issues and it has had all maintenance completed at he same dealership with Records.

I own a 2021 Chevrolet Silverado 2500HD Duramax diesel with approximately 100,300 miles. The truck began displaying a “Service Emissions System” warning and a countdown message that in a certain number of miles the vehicle will be limited in speed (for example to 65 mph). GM’s own Duramax diesel owner’s supplement explains that when a “Service Emission System” message appears it is accompanied by a distance-until-speed-limit countdown and that the truck will progressively limit speed first to about 65 mph and then to about 55 mph if the condition is not corrected, telling the owner to see the dealer. This creates a safety risk because the derate can occur while driving on highways or rural roads, where an unexpected limit on maximum speed can interfere with merging, passing, and keeping up with traffic. This is our only vehicle, and we must use it for important medical appointments, including cardiology and surgery-related visits. The condition started only about 300 miles beyond GM’s 5-year / 100,000-mile powertrain warranty. I opened a case with Chevrolet / GM Corporate (Service Request No. XXX) and took the truck to Sons Chevrolet in Columbus, Georgia on November 17, 2025 for this issue and a rear wheel lockup recall. The dealer kept the truck from about 9:00 a.m. to 3:00 p.m. and indicated they might need to keep it for at least two more days, but I was not given a clear written explanation of the diagnostic trouble codes or a firm repair plan. Because GM’s own manuals describe this “Service Emission System” message together with speed-limit countdowns, and because the vehicle can actively limit speed on the road if the fault is not resolved, I am concerned this represents a broader emissions/derate defect on late-model Silverado HD Duramax trucks. I request that NHTSA review similar complaints and consider whether further investigation or a safety recall is warranted. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2021 Chevrolet Silverado 2500. The contact stated that while slowing down and coming to a stop, the accelerator pedal was depressed while in drive; however, the vehicle started to roll backwards. The contact depressed the brake pedal to prevent the vehicle from rolling backwards, and the RPM became elevated to 5,000 RPM. The contact immediately turned off the vehicle to prevent the RPM from continuing to increase. The vehicle was shifted to park, restarted, and then shifted to drive(D) and the brakes released. While releasing the brake pedal, the failure reoccurred. The vehicle was immediately turned off and towed to the residence. The dealer was informed of the failure of the clutch pack, which was welded together from friction. The dealer scheduled an appointment; however, the vehicle was not diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 100,000.

The tailgate opens by randomly. I was in a CVS parking lot walking towards my car and saw the tailgate open without any commands. A young kid running towards his mother's car was just able to avoid running into it and getting 'clotheslined'. Another vehicle found it necessary to drive around the tailgate protruding from the parking spot. I have been finding the tailgate down multiple times, and thought I may have left it open even when I was sure I didn't. I also shut my tailgate recently and noticed I have a large dent in the tailgate itself when I closed it. It may have opened on another vehicle, or it was open when I was backing up assuming it was closed. After reading online I came across many owners having the exact same problems with the exact same truck. GM has told me the problem is VIN specific, and my VIN was not listed; therefore, no recall notice ever sent out to me.

Tailgate. Yes it can be inspected. It opens and closes randomly , I was going on to the freeway for work when I suddenly received a notice that the tailgate was opening. when I pulled over the gate was open and all the contents were at the end of the truck bed, power saws and equipment almost flew out into traffic! I then called the dealer who told me there was a recall and to bring it in, so I did and when I pulled in the service department the tailgate opened upon entering service area. After about 20 minutes he tells me that mine is not covered. Warranty ran out! And not on that Vin#. The tailgate now opens and closes randomly at all different times.Try to close and it just keeps opening and closing.Have to go out and close manually.

Unexpected roof rail airbag deployment without vehicle impact or accident. Front left and right side deploy - rear left and right side deploy spontaneously without notice.

Driving about 45 mph and unexpectedly both roof rail air bags deploy stoping vehicle on the road.

In certain GMC and Chevrolet Models 2019 to 2025 it is common knowledge and easily found on the web that there is a manufacturer defect that does not allow the vehicle to be placed in “park” properly due to defective parts in the steering column that do not allow the vehicle to safely turn off fully. The module does not seat and the vehicle will remain on in auxiliary. https://m.youtube.com/watch?v=RTcX-j3R5OQ . Again the link is an example but this defect is rampant.

Factory LED headlamp was flashing rapidly like a strobe light intermittently before it failed. The lights are bright enought that it was not immediately obvious to me (the driver) that anything was amiss. Was noticeable when close to other vehicles in traffic and on open, dark roads, where the strobing affect as apparent on reflective signs. The unit later failed completely and is now backordered and so unavailable to replace. I'm forced to drive with no headlight. The unit was faulty and suffered from water intrusion, which was determined to be the cause of the failure by the dealership. The failure occurred less than three years after the vehicle was placed into service, though it could not be taken in for service until a week after warranty expired. It is not covered by any warranty, though headlights are typically a wear item and expected to be readily replaceable. Dealer-quote cost to repair is $2,300, making the repair to be likely inaccessible to many owners. I have a video of the offensive behavior.

Service steering column lock continually appears on my screen. Front collision detectors are also going off for no reason.

Brakes: the brakes do not stop the vehicle without excessive pressure to the pedal. Especially carrying a trailer with the exhaust brake & trailer brakes in effect. Takes excessive distance for vehicle to stop. Pedal must be pressed 3/4 to the floor for it to start to apply brakes. It is extremely difficult to stop this vehicle at any speed over 45mph. Have not taken to dealer, was expecting a recall but none until now. Steering: when I turn the steering wheel at low speeds such as backing into a parking spot, there’s a loud squealing noise coming from the engine bay.

Wrangler Trailrunner AT LT275/65R20 were on the truck when I purchased my new 2021 Chevy 2500. I only have 25K miles on it. I was driving on the interstate and the tread came off the tire tore my wheel base apart and damaged back of truck along with scratches on the side by wheel also tore wheel trim off.

Goodyear Wranger At Trailrunner 275 65R20. I was heading home with my 14 year old daughter Sunday night. When I was merging on the on ramp to the highway and I felt a vibration. So I was in the process of slowing down and boom. My truck went broadside in the highway. I gathered it up and got all together. I don’t have a single dash light on or anything. The tire was still holding air. A matter of fact it still is. But when the tread came off it destroyed my bedside and bumper. My truck only has 32,473 miles on it. The tires are rated for 55,000. I just want something to happen to the manufacturer. If that would’ve happened to the right front it would’ve been bad. Or if it happened to a mom and kids. This is not good.

The contact owns a 2021 Chevrolet Silverado 2500. The contact stated while driving uphill at an undisclosed speed with a trailer hitched to the vehicle, the vehicle downshifted inadvertently, which caused the trailer to fishtail. The contact stated that he lost control of the vehicle, and he was able to slowly regain control of the vehicle. The contact stated that the failure had been recurring while driving. The vehicle was taken to an unknown dealer, where the cause of the failure could not be determined. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 110,000. The VIN was not available.

Windshield wipers stopped working on 4/23/24 while driving in the rain.