general problems of the 2021 Chevrolet Silverado 1500 - part 1

I have a 2021 Chevrolet Silverado 1500 with a 3. 0 duramax diesel engine, have had a check engine light intermittent a couple times. Vehicle went into limp mode. Had the diagnostic code read; p1010. Code p1010 shows an engine coolant flow control valve position sensor exceeded minimum learning limit. General motors has issued a special warranty n252508341covering 2021-2023 Silverado 1500 for this part ( lm2 coolant control valve replacement ) with a 15 year and 150,000 mile limit. I took my vehicle to the Chevrolet dealer and they said my VIN number was not covered. It would be a $1900 repair. I have read of numerous other of same vehicles listed under the special warranty, yet gm has excluded these VIN numbers as well. This is a known defect, gm has covered some but not all. Yet many are not covered yet having the same problem. I am not able to reach anyone at gm to talk about this issue. It needs to be addressed.

I am requesting immediate review and resolution regarding a major engine failure in my 2021 Chevrolet Silverado 1500 with the 6. 2l v8 engine. My vehicle has suffered a complete engine failure and is displaying code p0016 (crankshaft/camshaft correlation). This is a known and widely documented defect affecting gm 6. 2l engines and is the basis of an existing recall and engine replacement program for similarly equipped vehicles. Despite my vehicle exhibiting the exact same failure, I have been informed that my VIN is excluded from the recall. This is unacceptable, as it reflects inconsistent application of a known defect remedy. Under consumer protection principles, including the magnuson-moss warranty act, manufacturers are obligated to address known defects and ensure consistent warranty and post-warranty remedies where systemic issues exist. Denying coverage for an identical failure based solely on VIN exclusion raises serious concerns. I am formally requesting a full goodwill engine replacement. This failure is clearly tied to a known defect pattern, and I expect gm to provide the same remedy afforded to other affected customers. Please escalate this case for immediate review and confirm next steps. I am prepared to provide all supporting documentation.

Check engine light flashes when pulling a load and accelerating above 50mph. Check engine light code is po300 random multiple misfires. Took it to the shop and there we’re currently no active misfires.

Verified customers cpncern of cylinder 3 misfire and low compression. Inspected cylinder 3 sing a borescope and found excessive oil on top of the piston and on the cylinder walls. There are marks from loose carbon debris damaged the cylinder wall. Upon further inspection the oil looks to be coming from the valve seals. Recommend replacement of the long block assembly to correct these conditions. --cody glasscock, Ford Lincoln of morgantown.

The truck started backfiring and shuddering. Took it to the mechanic and with only 112000 miles I am being told it needs a new engine. It is the 6. 2l motor.

Was on way to trade truck in onb6/6/26 and got a cylinder #7 misfire. Replaced spark plug and wire and moved coil packs around to trace and stayed on #7. Just had recall completed on 9/25/25 and stated that I've heard a rattling noise in engine area. They performed recall and changed to new oil suggested by gm. Dealership said noise was transmission. I told them that was replaced already within last 50k miles under warranty. Drive it for a few days and rattling noise still there. Took back to dealer on 9/30/25 at cost of $200 diagnositc and stated there is a grinding noise under light acceleration like it's metal on metal. Dealer stated that it was the rear seat rattling. There were no noises in the cab, only coming from outside at driverside motor area. Called gm 10/1/25 to let them know the denial of motor replacement and we wanted 2nd opinion but we would have to pay out of pocket again. On 6/4/26 had to have truck towed to new dealer. New dealer won't make deal on new truck because of this and we have 2 trips already booked and paid for and 1 at end of June. New dealer is putting in service on 6/8/26 to verify cause. I have called gm after making repairs and they said it was between me and the dealer, there is nothing they can do. This is unacceptable! im fine if they would offset cost and buy a new chevy truck and we are going to fight to get it made right. This does make us want to change brands even though we've bought 5 chevys in the last 10 years.

Lights on the panel reads service parking break, engine, transmission, abs, traffic control and esc service. All these lights are on. Idling rough, white smoke with rich smell. Had a diagnostic read cam/crank and lifters bad… estimated cost 15,000. Total new engine install.

On June 3, 2026, my 2021 Chevrolet Silverado 1500 lt trail boss, which has a 6. 2l l87 v8 engine, stalled and shut off unexpectedly while I was stopped at a traffic light on a public highway. The engine died without warning, leaving me stranded in traffic and creating a serious safety risk for me and other drivers because of the chance of a collision. I had to call the police to come and sit behind me to keep myself safe from a collision while I waited for a tow truck. A dealer diagnosed the vehicle with dtc p0016, indicating a crankshaft/camshaft position correlation fault. This points to either an engine timing problem or an internal engine failure. The dealer confirmed the issue and gave me a repair estimate of about $11,000. Both the vehicle and repair records can be inspected if needed. Before the failure, the vehicle showed signs of an engine timing or internal issue and eventually triggered the check engine light with code p0016. After researching, I discovered many reports from other owners with the same 6. 2l l87 engine who faced similar problems, including p0016 faults, engine stalling, internal engine damage, and complete engine replacement. While some vehicles with this engine have been part of recalls or special coverage programs, my vehicle is not included, even though it shows the same failure pattern. At the time of the failure, the vehicle has about 140,336 miles. I believe my vehicle has the same defect affecting other 6. 2l l87 engines. I ask that NHTSA look into whether more vehicles should be added to any current or future recalls or defect investigations. Thank you for your attention to this matter.

It started backfiring and knocking.

I have 112,000 miles on my truck and my 6. 2l motor is going out or knocking. I am very unhappy that my truck is not covered under the recall and I would like to understand why it is not since this is the issue of the recall. I would like to clarification on this and what options I have since it is going to cost me 14k to replace the motor. Case #101943027.

Truck started ticking/clicking a few months back and the esc or ecs light came on took it to the dealer carl black Chevrolet in orlando, where the was supposed to to fix the problem under the previous owner, my boss who gave me the truck and 30 days after receiving the title the motor is bad. Mileage now is 112,000, the truck has burned the right fuel and had proper oil changes. Now the motor is blown as per a certified mechanic northeast auto and truck service in ocala. First owner called general motors to see if they could help and was told it should have gone to a chevy dealer so they won’t or cant help. Motor is blown on a truck with low miles and this is how chevy appreciate its drivers who purchase their vechiles. Buy american, they say…wow! on [xxx] the same reading came on again. This time it said service emergency brakes, parked it, went in store to purchase food, came out, started truck, drove 4 miles, parked truck went in to work and three hour later came out and white smoke rolled out the back and inside cab. What the heck! embarrassing … had to leave truck… chevy replace this engine, please. Was concerned about it information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Valve cover leak, known issue by gm, TSB 22-na-027, refusing to warranty known problems & charge the customer $4,000 in repairs.

Loud ticking noise and power loss. Transmission shift slips from 2nd to 3rd . Called factory and dealership for check up. Said no problem… told to change oil. Did this, no change.

While driving on the freeway, the truck suddenly displayed a flashing check engine light along with multiple warning/error messages. I was able to limp the vehicle to the nearest mechanic, where they inspected it and confirmed catastrophic internal engine failure. Upon removing the oil pan, they found large copper-colored metal chunks and metallic glitter throughout the engine oil, indicating severe internal bearing/component failure. The vehicle is no longer safe to operate and now requires major engine repair or replacement.

On 4/27/26, my family and I were traveling south on colorado c470 at 8 am. Our 2021 chevy Silverado 1500 had catastrophic engine failure at highway speed as we were passing an 18 wheeler. The failure caused the vehicle to lose power and engine, and the display said to put the truck in neutral and restart the engine. After coasting to the shoulder, the engine would not restart. We were stranded on the highway during rush hour for an hour and 1/2 waiting for a tow truck. This scenario is identical to the safety risks outlined in NHTSA recall 25v274 (and investigation pe 24-007). This failure resulted in the intake manifold being physically displaced and damage to the timing assembly. The dealership is attempting to deny coverage by claiming the "upper gallery" damage (timing/intake) is unrelated to the "lower end" issues covered under the special coverage/recall [ this is a dealer quote]. This logic is technically flawed: consequential damage: a catastrophic lower-end failure (e. G. , a broken connecting rod or seized crankshaft bearing) at 80 mph creates the massive internal pressure required to shatter or "blow off" a plastic intake manifold. Timing linkage: the timing chain is physically connected to the crankshaft. It is mechanically impossible to have a catastrophic crankshaft failure at high rpms without causing secondary damage to the timing gears and "upper gallery". Recall precedence: my vehicle exhibits the exact failure mode—loss of motive power due to bearing failure—currently being investigated by the NHTSA for 2019-2024 l87 engines.

While operating my vehicle under normal driving conditions, I experienced a sudden and complete loss of engine power without warning. The engine shut off abruptly in active traffic, creating an immediate safety hazard and increasing the risk of a collision for myself and surrounding motorists. Following the stall, the vehicle would not restart. The engine cranks but does not start (a “dry crank” condition). There were no prior warnings, indicators, or drivability issues suggesting an impending failure. This vehicle is equipped with the l87 6. 2l v8 engine, which is subject to a known recall involving internal engine defects that may result in sudden failure. The symptoms and failure mode observed are consistent with reported cases of internal engine damage, including potential bearing or rotating assembly failure. At the direction of gm and the dealership, the vehicle was previously brought in for recall inspection. The recall was subsequently marked as completed. However, I am now being advised that the recall cannot be reopened and that I am responsible for the repair costs. A completed recall inspection does not eliminate manufacturer responsibility when the underlying defect later results in failure. I understand there is an ongoing and recently reopened NHTSA investigation into gm’s “pico test” inspection process, as multiple engines have reportedly failed after passing this procedure. Given that this failure occurred after the recall inspection was completed, this incident raises concerns regarding the adequacy and effectiveness of the prescribed remedy. This event represents a serious safety issue due to the sudden loss of power in traffic without warning. I am submitting this complaint to document the failure and to request further review of the recall remedy and associated inspection process.

I completed the n252494003 recall inspection on my 2021 chevy Silverado 1500 6. 2l at carl black Buick/chevy/GMC in roswell, GA. They said my crankshaft was not one of the vehicles affected and sent me on my way with my free oil change as a remedy to the issue. I subsequently used that information, thinking the “bottom assembly” of my motor was good and not impaired, and proceeded to have the dod/dfm deleted from the motor because it was a known fail point and this work cost me $7,000. Maybe 6 months after my inspection for the recall, I begin to hear a noise and I take it to the same dealership for service and they tell me the crankshaft is faulty. Nothing about the dod/dfm delete and subsequent ecm tune had any impact on the crankshaft and yet, the dealership is denying fault when it was there service department hid the truth of the engine during the inspection. The warranty for the crankshaft is no longer applicable because of the modifications I did, but had they been honest about the faulty crankshaft, I would’ve never done that work to it in the first place. The engine should’ve been flagged during inspection and replaced.

For the second time in my 2021 Chevrolet silverado with a 5. 3-liter engine, I've had gm lifter failure. It's directly related to the active fuel management system (afm), and was confirmed by my Chevrolet dealer's mechanic and service writer, burdick Chevrolet in cicero, new york, on both occasions. They've had to perform a multi-thousand-dollar lifter replacement service job. They've told me that gm is aware of the safety issues, but won't do anything about them. It also happened to me with my 2014 Chevrolet silverado, but I was lucky that time. It was fixed with new spark plugs and wires. It's cost me thousands of dollars for repairs each time. But that's not why I'm reporting this to NHTSA. The issue is safety. When the lifters fail, you get no warning. The truck rattles and rumbles. It becomes unstable on the road, and sometimes wobbles as if it's about to go out of control. The problem causes the loss of electronic stability control (esc) and renders the electronic parking brake useless. Lifter failure can also cause the engine to stall while driving, especially at a stoplight. This happened to me. I had to press the gas pedal gently to keep the engine running at a stop light just to get off the road. On the highway, when the lifters fail, the truck slows to a point where it cannot keep up with traffic. That presents a dangerous situation. It's not safe. Gm knows about it, but as far as I understand, the company has done nothing to fix the safety problem. Internet forums are full of comments about the problem, the safety issues, and the enormous cost of repairs. Surely your agency can compel gm to fix the lifter failure problem before someone suffers a major accident due to an uncontrollable vehicle. I'll never buy another vehicle with afm. Many people are unaware of the dangers involved with this system. Gm should get rid of it. [xxx] skaneateles, [xxx] [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Truck is equipped with a 6. 2 engine. It is a 2021 with less than 100k miles on it. Dealership is stating engine failed for no reason. Dealership confirmed engine failure this past week of April 2026. This is a known issue and my vehicle is not under the recall. Truck stalled out of no where. There was no warning before it did it.

When taking off it will sometime have hard shifts, shuddering, and acceleration hesitation. While driving, it will do static jolts. Dealer couldn’t pin point problem and advised for a new transmission or we could drive it until it dies. Dealer didn’t recommend to change transmission oil in fear of creating more damage.

The contact's father owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving approximately 70 mph, the check engine warning light illuminated. The vehicle started losing automotive power. The contact pulled over and turned off and restarted the vehicle, but the check engine warning light remained illuminated, and while the vehicle was shifted to drive(d), the vehicle failed to accelerate above 40 mph. The contact stated that the vehicle was taken to a dealer who diagnosed the vehicle and determined that the lifters and cam shaft had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 63,000.

Engine temperature fluctuates. Check engine light comes on, prompt on dash will say engine is overheating. Engine fan stays on high. Code on scanner states coolant control valve. Gm has issued special coverage on this exact issue. However, they tell me my truck is not covered. I am very upset with gm as they are failing to address a known concern with my vehicle.

The contact owns a 2021 Chevrolet silverado1500. The contact stated while driving the vehicle he felt shuttering and noticed his automatic start does not start. The contact also experienced engine reduced power issues, preceded by a warning sign on the dashboard stating "engine power is reduced" while driving. Additionally, the contact noticed a significant loss of mileage per gallon and a loss of oil. The contact noticed a check engine light on, which had codes that had a crankshaft and cam shaft sensors that are not operating properly, which the vehicle cannot be inspected due to the failure. The vehicle was taken to a dealer where it was diagnosed to need a new timing chain to control on the cams and crankshaft. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 110,000.

The contact owns a 2021 Chevrolet Silverado 1500. The contact received notification of NHTSA campaign number: 25v274000 (engine and engine cooling), and the vehicle was taken to the dealer, where the contact was informed that the vehicle had passed the recall inspection, and no repair was needed. The contact stated that while driving at 50 mph, five months later, the engine seized in the middle of the roadway. The contact was unable to pull over to the side of the road. The vehicle was shifted to neutral(n) and pushed over to the side of the road with assistance. The vehicle was impounded by the local police department. The vehicle was then towed to an independent mechanic, where it was diagnosed, and it was determined that the engine had seized. The vehicle was not repaired. The contact stated that the recall remedy had failed to correct the issue. The contact related the failure to NHTSA action number: rq26001 (engine). The dealer and the manufacturer were not contacted. The failure mileage was approximately 125,700.

Right bank collapsed lifter. This is the 3rd time in 5 years this has happened same side same lifter. Loss of power engine shakes the whole truck. Also electronic emergency brake won't release automatically and engages when driving. This has happened when I first bought the truck in Mar 2021, again in Nov 2024 and currently at antelope valley Chevrolet on Mar 20 2026 for the same thing.

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving at various speeds, the vehicle started shaking abnormally. The service electronic stability control (esc) warning light, parking brake warning light, a wrench warning symbol, and the check engine warning light were illuminated. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was informed of the failure and confirmed that there was no recall associated with the VIN. The contact was referred to the NHTSA hotline to report the failure. The failure mileage was approximately 125,000.

The coolant control valve failed and the repair resulted in an engine oil leak which persisted for 8 weeks and still has not been repaired. The service manager at the dealership and general motors company are trying to figure out how to fix it but are not able to yet. They may have to replace the engine is one thing the service manager said to us this week.

Random catastrophic engine failure randomly made a clunk noise and oil pressure dropped to 0. Engine needs replaced.

- what component or system failed or malfunctioned, and is it available for inspection upon request? high pressure fuel pump, lifter, and cam shaft failure. - how was your safety or the safety of others put at risk? potential crash w/ kids in truck, loss of power, surging, engine damage, etc. . (fuel pump) potential crash w/ kids in truck, engine seizure, severe engine damaged, metal fragments, loss of power, abrupt lock up, fire hazard, excessive noise, etc. . (lifter/cam shaft) - has the problem been reproduced or confirmed by a dealer or independent service center? yes confirmed by dealer hiley chevorlet, case # 90727922 w/ general motors. - has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? yes by service dealer hiley chevorlet, case # 90727922 w/ general motors. - were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? no, no check engine light or messages. Bought the 21' silverado about 18 months ago, recently the truck began to sound and drive terrible, it was found to be a bad high pressure fuel pump, bad lifter, and damaged camshaft. Dealership acknowledged that these are common issues w/ this model & year of vehicle and the parts are defective parts that they use in the manufacturing process of this model. They deemed it was out of warranty range as it's still under year 5 however I exceeded the powertrain warranty by 10,000 miles so they will not cover the issues and damage.

The contact owns a 2021 Chevrolet silverado. Stated that while driving on several occasions at various speeds, the vehicle lost power and did not accelerate as intended. The check engine warning light illuminated. The vehicle was taken to a dealer but was not diagnosed. The vehicle was then taken to an independent mechanic where it was diagnosed that the coolant control valve needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 115,000.

I brought my vehicle to the dealership on March 7, 2026, to address the outstanding safety recall. However, I was informed that the recall repair cannot be completed until I first pay $1,100 to replace the idler pulley. Unfortunately, an unexpected $1,100 expense is not currently in my budget. It is quite concerning to continue driving a vehicle with a known risk of losing propulsion, as the increased risk of a crash is a significant safety worry for me. I would appreciate any assistance or alternative solutions you can provide to ensure this safety recall is resolved. Please find the message from the dealership: additional diagnostic recommendations: we are going to want to get the idler pulley replaced 1st as it can cause unwanted noise and vibration during the testing with the pico scope. After the repair take the vehicle on a good test drive get it good and warm then retest the engine with the pico scope and proceed with those test results. We still want to make sure it is tested correctly if the engine passes just note under special coverage n252494003 this special coverage covers if an engine failure occurs in the vehicle as a result of the condition described above for a period of 10 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. ".

2021 silverado ltz l87 6. 2l v8 engine. 49753 mi. February 27th 2026 total loss of power when parking. A few weeks later hearing knocking noises coming from driver side engine area. This is my daily driver and need this issued fixed.

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at 35 mph, there was a metallic sound as if a bolt had fallen inside the engine compartment and was rotating and spinning. The vehicle was taken to the dealer, where it was diagnosed, and determined that the camshaft and the engine lifters had failed and needed to be replaced. The vehicle was not yet repaired. The contact related the failure to NHTSA campaign number: 25v274000 (engine and engine cooling) and NHTSA action numbers: ea25007 (engine, engine and engine cooling) and rq26001 (engine). The manufacturer was notified of the failure and referred the contact to the NHTSA hotline for assistance because the VIN was not included in the recall. The failure mileage was approximately 116,000.

The engine was burning oil, so did a consumption test. The dealer took apart the engine and found the rings for the pistons were leaking and scaring was resulting. This caused me to buy part of a new engine because it was 6days past warranty with only 44,000mi on it. Also, at 18,000mi, a lifter bent and needed that replaced. There are numerous reports for this engine. It should be recalled! I shouldn't have to pay out of pocket for the defaulted error proned engine.

I am writing because I have a truck with the 6. 2l l87 engine and it has been burning oil at every start up and acceleration from stop signs or stop lights, it blows out a blue cloud of smoke. I have asked jeff belzers in lakeville , mn to look and they did not as my VIN did not show up in the recall. I took it to maur Chevrolet in inver grove heights, mn and they told me that my miles were too high and they did not do an oil consumption test. I am burning 2 1/2-3 quarts of oil every 3,000 miles. I called the gm customer service line and they said there is nothing they can do except note it, so if I do get it repaired and pay for it, I could possibly get reimbursed in the future. If there is a known issue with this engine and there being 3 different engine builders, than why is it that my engine doesn't fall under that recall. It has all the symptoms of the engine failure that is specified in the recall? and it started about 6 months ago. Thank you sincerely, [xxx] p. S. I have 136,000 miles and the special coverage warranty runs out at 10 years or 150,000 miles. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).