Mercedes-Benz GLC 300 no deployment problems

Filed Oct 12, 2026 · Airbags · FL · crash · 4 injuries

I am reporting a potentially serious vehicle safety issue involving a 2022 Mercedes-Benz GLC after a fatal crash. I was seated in the left rear seat. One occupant died and multiple people were injured. According to the Florida Highway Patrol crash report, the left curtain air bag was listed as “Equipped; Not Deployed,” while the right curtain air bag was listed as “Equipped; Operative; Deployed.” I suffered serious injuries while seated on the same side where the curtain air bag did not deploy. Before the crash, I remember hearing an unusual metallic rattling/clanking noise from the vehicle. I do not know what caused the noise or whether it contributed to the crash, but it occurred before impact. A family member later reported this pre-crash noise to the vehicle’s insurer. Law enforcement indicated that the vehicle’s event data recorder (EDR/“black box”) would be downloaded, but the crash report later stated “EDR Downloaded: No.” To my knowledge, the EDR data was never retrieved or preserved. The insurer later sold the vehicle as salvage before I was able to arrange an independent defect inspection, so the vehicle is no longer available to me for examination. I am not claiming that a defect has been proven. I am asking the federal safety agency to review whether the documented left-curtain nondeployment, in a crash severe enough to cause a fatality and multiple injuries while the opposite curtain air bag deployed, warrants investigation of the air bag/restraint system or another vehicle component. I am also asking the federal safety agency to consider the pre-crash metallic noise and the loss of access to the vehicle and EDR data when evaluating this complaint. Because the vehicle and EDR evidence may no longer be recoverable, I respectfully ask the federal safety agency to evaluate this complaint promptly and compare it with any similar air bag, restraint-system, sensor, or electrical complaints involving this model.

Filed Nov 16, 2025 · Airbags, Brakes · FL · crash · 1 injury

I was involved in a severe front-end collision where my vehicle struck another vehicle with significant force. Despite the major impact, the front airbags did NOT deploy. The entire front end of the vehicle was crushed, including destruction of the radiator, damage to engine components, internal structural collapse, and leaking fluids. Based on the severity and direct frontal nature of the crash, airbags should have deployed but did not. As a result of the impact, I sustained a neck and upper shoulder injury and required medical evaluation. There were no warning lights or messages prior to the crash indicating any malfunction in the airbag or SRS system. The vehicle is available for inspection by the federal safety agency, the manufacturer, insurance, or an authorized Mercedes-Benz service center. This appears to be a possible failure of the airbag/SRS system during a qualifying collision.

Filed Aug 7, 2024 · Engine · 35,000 miles · MI · crash

The contact owns a 2021 Mercedes Benz GLC 300. The contact stated that while driving at various speeds, the vehicle would lose power and fail to accelerate upon the depression of the accelerator pedal. The check engine light would appear on the instrument panel. Despite the failure, the vehicle would resume normal operation upon restart of the engine. The vehicle was initially taken to a dealer but the dealer could not duplicate the failure. The failure worsened over time which resulted in the contact being rear-ended by another vehicle. The air bags did not deploy upon impact and the contact was not injured. A police report was filed and the contact was able to drive the vehicle away from the scene of the accident. The vehicle was taken to various dealers and independent mechanics where each diagnosed the vehicle with a defective cylinder head. The manufacturer was notified by the dealer about the failure and the manufacturer agree to cover half the cost of the repair. The vehicle had yet to be repaired. The failure mileage was approximately 35,000.

Filed Jul 23, 2024 · Airbags, Brakes · 97,000 miles · TX · crash · 1 injury

The contact owns a 2024 Mercedes Benz GLC 300. The contact stated that while attempting to park, the vehicle experienced unintended acceleration causing the contact to lose control of the vehicle and crash into a wall, another vehicle, and two poles where it came to stop when crashing into the second pole. During the unintended acceleration, the contact depressed the brake pedal to control the vehicle however it failed to respond. No air bags deployed. The contact sustained chest, neck, and back injuries and an ambulance transported her to a hospital. A police report was filed. The vehicle was towed to an independent mechanic by the insurance company. The vehicle was not repaired. The dealer was not contacted. The manufacturer was not made aware of the failure. The failure mileage was approximately 97,000.

Filed Feb 11, 2024 · Airbags · FL · crash · 2 injuries

We hit a deer at 50mph. Active restraint system pulled us back into our seats. Cabin filled with white smoke/powder. Windows automatically lowered a few inches. Dash display panel issued fault alarms on all airbags and emergency braking systems; front and rear. Vehicle automatically contacted Mercedes SOS and dispatched police. Air bags never deployed.

Filed Sep 13, 2023 · Acceleration, Electrical · 10,000 miles · PA · crash · 1 injury

The contact owns a 2022 Mercedes-Benz GLC300. The contact stated while driving out of a parking lot at 5-10 MPH and making a left turn, the windshield wipers and the rearview camera engaged independently. Additionally, the vehicle accelerated unintendedly and crashed into another vehicle that was unoccupied and parked on the left side of the road. The air bags did not deploy. The contact sustained bruises and soreness around the left elbow, but did not seek medical assistance. A police report was filed. The vehicle was towed to a Mercedes-Benz auto collision center, where she was informed that the front driver' side suspension was fractured due to the collision. The dealer was notified of the failure. The vehicle was not diagnosed nor repaired. The manufacturer was notified of the failure, and a case was opened. The failure mileage was approximately 10,000.

Filed May 28, 2021 · Airbags · IL · crash · 1 injury

The contact owns a 2020 Mercedes-Benz GLC300. The contact stated that upon driving through an intersection at 40 mph, another vehicle had run a stoplight. The contact swerved in an attempted to avoid the vehicle, however, she had hit the vehicle's rear driver side tire weld. The contact stated that the driver-side airbag did not deploy upon impact; however, the passenger-side airbag, where her mother was seated, did deploy. The Mercedes-Me app automatically called 911 and the contact initially declined medical attention at the time. A police report was filed. Due to the failure, the vehicle was towed to an independent mechanic. The next day, the contact was referred by her doctor to a hospital where they performed a cat scan and x-ray. The contact tested positive for Covid-19 the following Monday and believed it was as a result of the hospital visit. The manufacturer was notified of the failure and upon her own research, the contact discovered the federal safety agency Campaign Number: 21V354000(BACK OVER PREVENTION, ELECTRICAL SYSTEM). The vehicle remained in the possession of the independent mechanic and had yet to be repaired. The failure mileage was unknown.

Filed Jul 8, 2020 · Airbags, Driver assistance · 25,000 miles · AL · crash · 1 injury

Tl* the contact owns a 2017 mercedes benz glc300. The contact stated that while his wife was driving approximately 40 MPH, the vehicle crashed into a 2nd vehicle. During the crash the front end was severely damaged but the air bags did not deploy. Also, the collision avoidance system malfunctioned and did not stop the vehicle to avoid the collision. The driver sustained bruises to the torso area which required medical treatment. An occupant from the 2nd vehicle was transported to the hospital by ambulance. No further information was available. A police report was taken at the scene and the vehicle was towed away. The local dealer mercedes benz of huntsville (6220 university dr. Huntsville, al) and the manufacturer were notified of the incident. The cause of the failures were not determined. The failure mileage was 25,000.

Filed Feb 3, 2020 · Airbags, Transmission · 29,000 miles · CT · crash

Tl* the contact owns a 2016 mercedes benz glc300. The contact stated he placed the gear shifter in park while engine was running however vehicle rolled across the street and crashed into a stone wall. The contact opened the driver's side door however, vehicle failed to stop. There were no reported injuries or fire. The air bags did not deploy. A police report was filed. The vehicle was towed to an independent lot. The local dealer and manufacturer were not contacted. The failure mileage was 29,000.

Filed Sep 11, 2017 · Brakes · 6,000 miles · CA · crash · 1 injury

Tl* the contact owns a 2016 mercedes-benz glc300. While driving 5 MPH, the brakes malfunctioned without warning. The contact depressed the brake pedal and the vehicle surged forward independently. As a result, the vehicle crashed into the contact's barn. The air bags did not deploy. A police report was not filed. The contact sustained severe whiplash to the neck and wrist pain from the crash. Medical atttention was required. The vehicle was towed to mercedes-benz of fairfield (2950 auto mall pkwy, fairfield, ca 94533), but the dealer could not duplicate the failure. The manufacturer was made aware of the issue by voicemail, but never called back. The failure mileage was approximately 6,000.