2021 CHEVROLET SILVERADO 1500 Complaints

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.

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.

LIFTER FAILURE AT 50,100 MILES- JUST OUT OF POWERTRAIN WARRANT BY 136 DAYS. FAILURE OCCURED ON FREEWAY. AFTER HEARING METALLIC SOUND SERVICE BRAKE SYSTEM LIGHT, TRACTION CONTROL AND SERVICE ENGINE LIGHT CAME ON. THIS OCCURED 5/3/26.

Valve Cover leak, Known Issue by GM, TSB 22-NA-027, refusing to warranty known problems & charge the customer $4,000 in repairs.

Two grounding straps failed on my 2021 Silverado Trail boss lt. GM has a recall for this exact problem under N252515590, model years 2019-2024. Apparently my vin number is not associated with this recall, yet my dealer just did the recall repair. They said my truck did not qualify for the GM recall and I was forced to pay for the repair. The failing grounding straps caused my power steering to go out and my brake system and safety traffic sensors to fail as well. This was very dangerous as it would fail randomly while driving the truck. There were no warning signs or lights on the the truck to indicate any problems.

Vehicle: 2021 Chevrolet Silverado VIN: [XXX] Mileage at time of incident: Approximately 68,000 miles Date of incident: April 24, 2026 Approximate speed: 75 mph Weather/road conditions: Clear, sunny day Was the vehicle towed? No Did the engine restart? Yes My 2021 Chevrolet Silverado experienced a sudden loss of power and stalled while I was driving on the highway at approximately 75 mph. The weather was clear and sunny, and road conditions were normal. This created a serious safety concern because the vehicle lost power while traveling at highway speed in traffic and could have caused a crash. The vehicle did restart after the incident and was not towed, but it had to be taken in for service after the power loss/stalling event. The dealership later advised that the oil was low on the dipstick and stated they would change the oil and complete a recall/service update. However, I have maintained the vehicle with regular oil changes, and at the time of the incident, the vehicle’s oil life monitor still showed approximately 50% oil life remaining. I do not believe this should be dismissed as a simple lack-of-maintenance issue. I am concerned that the sudden loss of power/stalling may be related to an engine, fuel, oil pressure, electrical, ECM, or recall/service campaign issue. I am also concerned that the vehicle was low on oil despite regular oil maintenance and the oil life monitor still showing about 50%. The vehicle is currently at Tyrell Chevrolet for inspection/service. I have not yet received a clear explanation of the cause of the power loss, whether diagnostic trouble codes were found, whether oil pressure was affected, whether oil consumption was checked, whether any recall or service campaign caused or corrected the issue, or whether the truck is safe to drive. This sudden loss of power while driving at approximately 75 mph presents a serious safety risk and should be investigated. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The special coverage program on the coolant valve for My 2021 Chevy Silverado (70,000mi) is not covered due to my vin not being on the list. Something they say and know is an issue, but not covering it for the vehicles they say they’re covering it for.

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that after parking the vehicle, it was later discovered that the rear tailgate door had erroneously opened. The contact indicated that the failure had occurred on multiple occasions. The cause of the failure was not yet determined. The local dealer and manufacturer were notified of the failure but no assistance was offered. The failure mileage was 22,000.

The vehicle was shiifting sluggishly and the check engine light came on. The dealer has indicated that I need to replace a transmission controller valve body. This problem has been acknowledged by GM and a recall initiated, but my vehicle was not included in the recall. This does not seem reasonable and I believe the recall should be expanded.

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.