2021 Chevrolet Silverado 1500: sudden loss of power

Filed Nov 3, 2026 · Engine · PA

The truck shut down while on the highway, complete loss of power and would not restart. Chevrolet dealership concluded that the engine has locked up/failed. Chevrolet states that 2021 6.2-L L87 engine is not included in Recall 25V‑274 despite similar mechanical failure.

Filed Oct 27, 2026 · Engine · OH

On October 18, 2026, I was driving my 2021 Chevrolet Silverado 1500 with the 5.3L V8 engine at highway speeds with my wife and two young daughters in the vehicle when the engine suddenly lost power and the truck began shaking violently. The check engine light flashed, and "Service ESC" and "Service Parking Brake" warnings appeared on the dashboard. The sudden loss of power at highway speeds created a serious safety risk to my family and surrounding motorists. I was able to get the vehicle off the highway safely. Restarting the truck did not resolve the issue, and it was no longer drivable. The truck was towed by a AAA contractor to a Chevrolet dealership. Following inspection, the dealership verbally diagnosed a broken camshaft and advised that the entire engine required replacement. The truck had approximately 98,000 miles at the time. A written diagnosis has been requested, and the vehicle is currently at the dealership. The truck has a documented history of engine problems. In July 2023, at approximately 33,500 miles, a Chevrolet dealership diagnosed code P0300 and documented misfires on cylinders 1, 3, and 7. Warranty diagnostic and repair work was performed. Another check engine light concern was documented in November 2024 at approximately 62,300 miles. In April 2025, at approximately 69,600 miles, Chevrolet again investigated a P0300 multiple-cylinder misfire condition. Beginning around 75,000 miles, the truck also began displaying recurring low-oil warnings. I added oil whenever these warnings appeared and maintained regular oil changes, supported by service records. Despite these prior engine concerns and dealership visits, the engine suffered a catastrophic failure without an immediate warning before reaching 100,000 miles. I am concerned about the potential for sudden engine failure and loss of propulsion at highway speeds and believe this warrants a safety investigation.

Filed Oct 27, 2026 · Engine · 79,000 miles · MN

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving the vehicle at highway speeds, the vehicle shut off and lost power. The vehicle failed to accelerate and coasted off the interstate to a safe stop. The contact stated that several warning lights were illuminated on the instrument panel while the vehicle was losing power. The contact stated that two days prior to the failure, the vehicle was taken to an independent mechanic for an oil change, and there was no failure found. The manufacturer was notified of the failure. The vehicle was towed to the dealer where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The failure mileage was 79,000.

Filed Oct 16, 2026 · Engine · FL

Coolant control valve Is available for inspection Safty issues include Loss of power steering and brakes while driving Sudden power limp mode Sudden engine over heating and engine seizure Loss of visibility due to smoke and Loss of defrosting Inspection done by chevolet (live oak Fl) Check engine light and code p1098 appeared after defect.

Filed Oct 4, 2026 · Engine, Fuel system · TX

I am submitting this complaint regarding a 2021 Chevrolet Silverado 1500 Trail Boss 4WD with the [6.2L V8 (L87)], VIN [XXX], 101,000 miles. The truck was assembled in Mexico in XXX, about six weeks before XXX, just outside the build range of GM recall 25V‑274 (N252494000, Engine Failure). On 10/2/2026, [XXX], [XXX] a certified GM dealership, diagnosed crankshaft and lifter failure, matching the recall condition. Codes: P0300, P050D, P0016. The truck was shaking violently, the ESC and emergency braking system failed, reducing engine power. GM's Part 573 filing attributes the defect to out-of-specification crankshafts and identifies a Mexico-based crankshaft supplier. I ask GM to confirm my engine's build date and crankshaft source. A six-week gap in build date should not exclude a truck with the same failure. Engine failure can cause sudden loss of power while driving, a safety risk. The dealer quoted repairs of up to $10,292.00. I request: That GM cover the repair in full as a goodwill adjustment. That GM and the federal safety agency review expanding the recall population to trucks built near my date. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 17, 2026 · Electrical, Engine · PA

2021 silverado engine failure. Yes it was inspected by a dealership and my extended warranty company and serviced by the dealership. Back on August 5th I experienced a misfire cylinder 3 and felt loss of power. On August 7th the dealership diagnosed both camshafts, 1 lifter, 1 valve, and 1 fuel injector was damaged and never received at warning lights or messages on the dashboard. I was without the vehicle for 39 days and within 10 hrs after picking up the truck i got an engine light on and several new codes on it and can not be driven and being towed. I feel these engines need a recall as it is well documented that these engines go between 60 and 80,000 miles and some a lot less than that, mine has 70,800 and went and now being towed with in less than 24 hrs after engine repair. I will be in contact with a lawyer to follow up on this matter.

Filed Sep 8, 2026 · Engine · TX

Loss of power , catastrophic engine failure

Filed Sep 1, 2026 · Engine · MI

Vehicle went into reduced power mode and was taken to the dealership. They had to tear down the motor to diagnose the problem and determined it was the crankshaft and the motor needed to be replaced. It was out of factory warranty however it has an extended warranty and the warranty covered 80% of the repair. We still had to pay over $3k out of pocket. Vehicle is now making engine noises again and will be getting taken back to the dealership to be looked at. Currently not part of the recall however truck was built at the Mexico plant in question. We believe it may have the faulty components as well.

Filed Aug 26, 2026 · Engine · TX

I own a 2021 Silverado Trail Boss LT with the 6.2L V8. I purchased the vehicle new at Classic Chevrolet in [XXX]. In XXX, it experienced what I can only describe as engine failure. Severe knocking, loss of power, rough idling. I contacted the dealership as it was under warranty (it had approximately 45k miles at the time). They towed the vehicle in and performed repairs. I do not have service records but the repairs totaled approximately 12-15k dollars and involved several engine part replacements. I received the vehicle back after about 2 weeks. I later learned of the factory recall that was issued by GM affecting my truck and took it in for inspection. This XXX5. It was inspected and passed. They did replace the oil to a higher weight oil as recommended. In XXX it experienced the same issues as before. This time while driving on freeway. Sever engine knocking and loss of power. As I was on the way to work, I drove straight to the dealership to drop it off. After inspecting, they determined it warranted a replacement engine under the original recall. They kept the vehicle about 3 weeks and returned back to me in early XXX. It has been driving fine since then, but I am worried the replacement engine may have the same defects as the original engine. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 6, 2026 · Engine, Fuel system · OK

On August 22, 2025 the malfunction indicator lamp (code: P146B Evap. purge pump) illuminated with no noticeable change. Ran codes at auto zone which stated engine failed and emissions not ready. August 25, 2025 drove to certified Chevy dealer dropped off vehicle and showed the service advisor the fix finder test results from auto zone as well as the illuminated indicator lamp (check engine light). August 26, 2025 picked up my vehicle with receipt stating "found dtc's P146b and P1467 stored in ECM (engine control module) for evap purge pump fault. inspected evap canister for any signs of fuel and none were found. replaced evap purge pump per special policy #N232395310. Cleared dtc and road tested vehicle to verify repair". September 9, 2025 my engine indicator light illuminated and my engine entered limp mode, a safety feature which reduces cylinder output/capacity. September 12, 2025 while in limp mode, I returned to the service dealer and informed them of the reduced power (limp mode) and my confusion as the second engine symbol that has been illuminated is in a different area than the first and my truck has ONE engine. (editor note: malfunction indicator lamp is for the emissions). My original transmission (8L90) was replace, because my vehicle was under power train warranty and the service advisor took it upon himself to approve the disassembly of my running, in good condition 8L90 transmission without consulting me or my approval. the 8L90 was "discontinued" for the 2020-2022 years without recall come to find out (sarcasm). I now have a new transmission (8L86-85) with the "special coverage" part (#N232395310) still connected, only now I have NO additional powertrain coverage for a new transmission, but the "special coverage" originally issued in 2023, BY MAIL, for 15 yr/150,000miles has extended two years plus mileage. (15 yr / 152,955) .The "special coverage" part should NOT affect the engine! Engines produce power/HEAT not CO2 . Sarbane - Oxley Act.

Filed Aug 3, 2026 · Engine, Transmission · OH

2021 Chevy Silverado 5.3 trail boss lifters has failed on this driver two times while driving on highway engine lost power with my family in the vehicle. Dealer warranty fixed lifter the first time lifter went out at 1100 miles. The vehicle has failed again with multiple lifters going out and camshaft needing being replaced also on my extended warranty at 73000 miles. I do not want to take this vehicle back in my possession as it has put me and my family at risk twice being stuck on highway with no power.

Filed Jul 25, 2026 · Engine · IN

While driving at ~50mph, the truck immediately went into reduced power mode, temperatures spiked to 260 from 210. Engine code P1006 showed indicating coolant control valve failure. After experiencing, I discovered that GM issued Special Coverage for Coolant Control Valve (N252508341). However, the local Chevy dealership indicated my truck would not be covered even though it is within the timeframe/mileage, and falls in the year/make/model categories. According to them, the coverage is VIN specific and my VIN is not listed. They directed me to Chevrolet Customer Care. Customer Care did not acknowledge the Special Coverage until I directed them to the correct bulletin. They further indicated because my VIN was not covered, they would not be able to do anything. This issue is HIGHLY known by GM, but they have failed to remedy appropriately. It is also a safety hazard, especially in my case, where the failure occurred on the highway, at speed with cars behind me, and resulted in the truck immediately ceasing normal operation causing the potential for property damage and/or injury.