2021 Chevrolet Silverado 1500 Problems

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated and the messages "Engine Power Reduced" and "Speed Limited to 65 MPH" were displayed. The vehicle was taken to a dealer, where it was diagnosed and determined that the engine coolant flow control valve and related components needed to be replaced. The vehicle was not repaired. The contact associated the failure with NHTSA Action Number: EA25007 (Engine, Engine and Engine Cooling). The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 95,000.

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.

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.

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The contact stated that there was an abnormal sound coming from the vehicle and the vehicle was jerking erratically. The contact stated that the transmission was shifting hard, and the vehicle drove abnormally rough. No warning lights were illuminated. The vehicle was taken to the dealer; however, the failure was not duplicated. The failure was persistent. The manufacturer was not made aware of the failure. The failure mileage was approximately 49,000.

May 28 ,2026 I left work to get some lunch And when I went back inside my vehicle I turned it on and the check engine light came On and on the dash it was telling me to park the truck and it wasn’t going more then 45mph so I called my dealer ship simspson Chevrolet in garden grove and they told me they couldn’t do anything because it wasn’t under warranty so I had to take my truck to a near by auto shop because my truck is my daily and I use to get to work so the. The body shop found out the problem it was the wiring harness it was the way they installed the wiring harness it’s manufacturing I called my insurance company and I called GMC directly and they don’t want to help me

Loss of engine power while merging or passing traffic. * Reduced acceleration making it difficult to enter highways safely. * Engine overheating if the active grille shutters fail in the closed position. * Unexpected limp mode causing sudden speed reduction in traffic. * Increased risk of a rear-end collision due to loss of power or reduced speed. * Check engine light and warning messages distracting the driver. * Vehicle stalling while driving or at intersections. * Reduced visibility if the defroster or HVAC performance is affected by engine temperature issues. * Potential engine damage from overheating, creating a hazard if the vehicle becomes disabled on the roadway. The active grille shutter system malfunctioned and caused warning lights to illuminate. I am concerned that the shutters remaining closed could lead to engine overheating or reduced vehicle performance while driving, increasing the risk of an accident due to loss of power or unexpected vehicle behavior in traffic.

Turned from [XXX] into my street, about 9 houses down, i could not brake or turn steering wheel. Ended up hitting 2 cars, the problem was that the air bags did not deploy and the seat belt did not lock. truck was totalled. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the message that the rear seats were occupied and that the windows were rolled down was displayed, which required the contact to press the OK button. The vehicle was taken to the dealer where it was purchased, but no assistance was provided. The traction control and the ABS warning lights were illuminated while depressing the brake pedal. Additionally, the cruise control mode was inoperable. The contact replaced the brake pedal position sensor independently, and the vehicle was taken to an independent mechanic, who reprogrammed the sensor. The contact stated that after the repair, the brake lights erroneously illuminated while the vehicle was turned off, causing the battery to drain. The contact disconnected and reconnected the battery, which reset the vehicle; however, the failure recurred. The vehicle was not further diagnosed or repaired. The manufacturer was not contacted. The failure mileage was 110,881.

Sudden loss of power steering, usually upon initial start. May return, may not return during drive. Began around 1 week ago. Sudden loss of power steering when turning either right or left has occurred causing a dangerous situation. Upon loss of power steering, 2 warnings appear. One for loss of power steering and the other for the trailer brake. Have never trailered anything with truck. Check engine light has come on at times, others it has not. Steering failure has occurred approximately 6 times. An internet search found some reference to my vehicle being informally added to the recall affecting other GM Vehicles. Vehicle has not been inspected yet.

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.

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.

2021 Chevrolet Silverado 1500 Custom 2.7 L Turbo 4 cylinder with 34,000 miles When Truck cranks and put in gear begins moving at low speed between 1-2 gear (low speed 5-10 mph forward and also in put into reverse) hard jolted severely injuring passenger. Felt like being rear-ended by another car. Passenger was hurt & required Trauma 1 EMS & 2 surgeries (Spinal Fusion Surgery) hospitalization from 12/2/2025 to 12/13/2025. The truck jolt directly caused this accident and there were many recalls for this truck yet we had no direct knowledge of this information & was never notified of any of these issues. Truck was services at same dealership just weeks prior to accident. The truck check engine light came on only after the accident. It happened on a private gated property. Only select trucks have been said to do this very hard jolted injuring passenger and owners are not made aware using Silverado 1500 trucks. Please acknowledge receipt of this report and advise. Thank you.

I was on the highway doing 70 MPH with my family driving down I-40 through western NC (mountainous terrain) when my brakes went out and the vehicle went into limp mode. I was able to safely pull over thank God and then had my vehicle towed to the dealer. The dealer just informed me that a software update is needed, and not covered under warranty. There are multiple safety bulletins coming out for related years and issues related to the braking system of this make/model and I would like this documented as well as Chevy to cover the cost of repairing this defect.

Once I disengaged the auto stop on my vehicle, I would accelerate from a stop and I would loose my brakes. This happened several times. I took it to the shop and was told it was fine. Finally, one day I was descending on an overpass, disengaged my auto stop and my brakes were complete failure, even my emergency brakes, my check engine light engaged (the code read emissions issue). Was able to stop in a field, get it back to the dealership to find out I lost the master break cylinder but no indication on prior visits. The truck, check engine light will spontaneously start blinking but hold no codes. I have had it routinely serviced and it will overheat and oil will run hot but mechanics find no issues

APPARATUS USED TO HOLD HOOD UPRIGHT, (2 STRUTS), FAIL WITHOUT WARNING. STRUTS HAVE BEEN REPLACED FOUR (4) TIMES IN PAST TWO (2) MONTHS WITH TWO ( 2) OEM PARTS AND ONE (1) AFTER MARKET PART. LAST OCCURANCE, 12/26/2025, CAUSED A MINOR HAND INJURY. IF NOT PREPARED FOR SUDDEN CLOSING OF HOOD, POSSIBLE SERIOUS INJURY COULD RESULT. THE VEHICLE AT PRESENT HAS 19,775 MILES AND HAS BEEN EXAMINED BY THREE (3) SERVICE TECHNICIANS FROM DEALERSHIPS AND CAN NOT EXPLAIN WHY IT IS OCCURING OR HOW TO REPAIR IT.

Rear power window has been replaced multiple times, each time it develops cracks and leaks water causing possible mold in the truck cabin.

Turned from [XXX] into my street, about 9 houses down, i could not brake or turn steering wheel. Ended up hitting 2 cars, the problem was that the air bags did not deploy and the seat belt did not lock. truck was totalled. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Air bag light was on , took to dealership because this was absolutely a safety hazard! The left front crash sensor is defective.

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 contact owns a 2021 Chevrolet Silverado 1500. The contact stated that on several occasions while driving at various speeds, the tailgate inadvertently opened. The tailgate was closed, but the tailgate reopened unexpectedly within several seconds. The contact stated that while the vehicle was parked, the tailgate opened unexpectedly. After closing the tailgate, the tailgate reopened within several seconds. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was not available.

On 2-23-2026, while traveling at highway speeds on the freeway, the front upper and lower A-arms (control arms) suffered a complete structural failure. This caused an immediate loss of steering control, forcing the vehicle off the road. By sheer luck and reactive maneuvering, I was able to avoid a multi-vehicle collision; however, the failure resulted in over $4,000 in mechanical and body damage.

The contact owns a 2021 Chevrolet Silverado 1500. While driving 43 MPH, the message "Brake Failure" was displayed. The contact then lost control of the vehicle, and the vehicle drove from the right side to the left side of the road, the vehicle drove off the road and crashed into a ditch before coming to a stop. The driver had not sustained any injuries. There was no property damage. The air bags did not deploy. The check engine, the ABS and several unknown warning lights were illuminated after the failure. A tow truck driver who was also a mechanic inspected the vehicle and informed the contact that the driver's side front suspension had fractured from the upper ball joint and the wheel was folded in underneath the vehicle. The vehicle was towed to the dealer, where it was being diagnosed. A Police Report was filed. The manufacturer was not notified of the failure. The failure mileage was approximately 98,000.

Starting back in June 2025 Loss of engine power multiple times. Many times almost hit from behind as I turned onto a highway. Found out vehicle had a stop sale recall at the time of purchase and I had issues with back right tire. Took truck to a tire shop and learned that the wheel was welded in many places and fracture was visible. Finally, got the dealership to pay attention in October to my concerns. They were going to allow me to trade the vehicle out for another one while paying off the bank but that’s not what they did. They attempted the repair and tried to hand it back to me. 1/27/26 Was recently told this was corrected, and the sales person told me when he picked it up from shop he couldn’t go more than 30 mph. Dealership management told him not to tell me. I am submitting this complaint for immediate review regarding Ruiz Ranch Motors (Spring Branch, TX) for an illegal vehicle sale, prolonged withholding of my vehicle, misrepresentation of a “loaner” vehicle, and coercive threats involving law enforcement. This matter involves ongoing safety risks, financial harm, and improper dealer conduct affecting both myself and my minor child. Summary of Key Facts (Concise): • On June 25, 2025, I purchased a 2021 Chevrolet Silverado (VIN 1GCUYHET7MZ155657) from Ruiz Ranch Motors, financed through Ally Financial. • The vehicle was subject to a GM Stop-Sale / No-Sale Safety Recall (NHTSA 24V797000) at or around the time of sale. • I repeatedly raised safety concerns beginning shortly after purchase. These concerns were dismissed for months. • In November, Ruiz Ranch Motors took possession of my 2021 Silverado under the representation that they were “working on trade numbers” and a solution to correct the experience. Misrepresented “Loaner / Trade” Vehicle: • I was provided a 2023 Chevrolet Silverado, represented as a potential trade option, no trade was made (only dealership delay) this vehicle now has a engine light and no cooperation from dealership

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving 30 MPH, the rear wheels locked up, causing the vehicle to slide across the road. The contact was able to regain control of the vehicle and came to a stop in the middle of the road. The check engine and traction control warning lights were illuminated. The contact turned off and then restarted the vehicle and became aware that the transmission failed to shift into the intended gear. The vehicle was towed to the contact's place of employment. The contact who is a certified mechanic performed a diagnostic test and retrieved DTC: P0747, indicating a failure with the pressure control cylinder in the transmission. The contact also found information on NHTSA Campaign Number: 24V797000 (Power Train); however, the VIN was not included. The vehicle was not repaired. The dealer was contacted and confirmed that the VIN was not included int the recall. The manufacturer was not informed of the failure. The failure mileage was 83,830.

Window switch failed and I was unable to roll down the window. Dealer confirmed and performed repairs. Problem occurred on a dry day with no previous issues and the dealer stated it was manufacturing defect with the switch.

Rain is coming in through the back window. Dealer is stating that the rain is coming from the sliding window but satellite is stating it’s the brake light on the top of the truck.

Turned from [XXX] into my street, about 9 houses down, i could not brake or turn steering wheel. Ended up hitting 2 cars, the problem was that the air bags did not deploy and the seat belt did not lock. truck was totalled. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am submitting a safety complaint regarding a vehicle restraint system failure. I was involved in a collision with a deer. During the incident, the seat belt pretensioner activated; however, the seat belt did not properly restrain me. I experienced forward movement despite the pretensioner activation. The airbags did not deploy. Because pretensioner activation is intended to lock and tighten the seat belt during a collision, I am concerned that the restraint system failed to function as designed. This raises concerns about occupant safety and the ability of the seat belt system to provide protection in future crashes. I am submitting this complaint to document a potential safety defect and request review of this restraint system failure.“After reporting the seat belt restraint failure to General Motors, I was informed that because I was not injured, no action would be taken and no further review would occur.” Thank you for your attention to this matter.

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at various speeds, the vehicle jerked unexpectedly. The check engine warning light was illuminated. The vehicle was taken to a local dealer, where it was diagnosed, and determined that the valve body needed to be replaced. The vehicle was not repaired due to parts not being available and the VIN not being included in a recall. In addition, the part was ordered at the owner's expense. The manufacturer was made aware of the failure. The failure mileage was approximately 145,565.

See attached document for complaint.

While towing at night with horses, trailer lights started blinking on and off, eventually for longer periods, then stopped working all together. Research shows this is a common problem in GM vehicles related to the wiring and trailer light module. This is especially dangerous when pulling horses at night and all of the sudden lights go out. GM issued a technical service bulletin. This should be a recall...

Rain is coming in through the back window. Dealer is stating that the rain is coming from the sliding window but satellite is stating it’s the brake light on the top of the truck.

A tire purchased new as part of a complete set failed on June 29, 2026, approximately 58 days after purchase. The vehicle was being driven on a smooth road surface under normal driving conditions when the tire suddenly failed. There was no known impact with a pothole, curb, road debris, or other road hazard before the failure, and there were no warning lights, messages, or noticeable symptoms indicating a problem with the tire before it failed. The sudden tire failure created a serious safety concern because it occurred while the vehicle was being driven and could have resulted in loss of vehicle control, a collision, or injury to the vehicle occupants or other motorists. Because the failure occurred while traveling out of state, the tire was taken to an independent tire service center for inspection. After inspecting the failed tire, the service center documented that the tire had separated internally and determined that the failure was due to a manufacturing defect. Written documentation of the inspection findings was provided. The failed tire was later taken to the selling Goodyear location for inspection. Goodyear disagreed with the independent inspection and claimed that the failure resulted from a pothole impact. No pothole or other road hazard was struck before the tire failure. The failed tire has been retained and remains available for inspection upon request. The independent service center’s written inspection report, photographs, purchase documentation, and other supporting records are also available. 275/65R18 116T

Unknown,don’t want to have an accident if my rear wheel lock up on me for my recall of my vehicle don’t want to put my family at risk