DRIVING A 2024 MERCEDES C300 ON THE FLORIDA TURNPIKE IN THE LEFT LANE AT 70 MPH THE ENGINE SUDDENLY SLOWED DOWN. WHILE THE VEHICLE SLOWED IN HEAVY TRAFFIC I WAS ABLE TO MERGE TO THE OUTSIDE LANE WHERE IT STOPPED. I CALLED MERCEDES EMERGENCY WHO SUGGESTED WAITING A WHILE AND TRY STARTING THE VEHICLE . AFTER A FEW MINUTES I WAS ABLE TO START THE VEHICLE AND DRIVE IT TO THE DEALER. THE DEALERS COMPUTER ACKNOWLEDGED THE STOPPAGE AND AFTER THREE WEEKS AND 500 MILES DRIVEN BY THE DEALER WAS NOT ABLE TO DETERMINE THE CAUSE AND PLANS TO REPLACE THE ENGINE COMPUTER. I AM [XXX] OLD AND AFRAID TO DRIVE THIS CAR AND WANT TO END THE LEASE. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Source: NHTSA complaint ODI #11751377 · view all complaints for this vehicle at nhtsa.gov

Dashboard reading incorrectly. Blackout screen while driving. Mileage incorrectly reading. Speed limit incorrectly reading while driving the Dashboard pick up the undercarriage camera. The electricity on the car keep popping up. I have been complaining over 1yr since I lease the vehicle they only offer to trade with me paying the expenses. Gas gage not reading correctly

Source: NHTSA complaint ODI #11754852 · view all complaints for this vehicle at nhtsa.gov

The vehicle appears to have experienced a braking system malfunction, possibly involving the brake-by-wire system, electronic stability control (ESC), or unintended acceleration event. When the brake pedal was fully depressed, the car suddenly and uncontrollably accelerated forward into a cinder block wall. After the incident, it was observed that only the left-side tires left skid marks, indicating an apparent brake imbalance or failure on the right side. The vehicle is available for inspection upon request. My safety and the safety of others were severely compromised. My daughter and I were in the car during this and are extremely traumatized. Despite pressing the brake pedal, the vehicle accelerated forward and crashed into a cinder block wall, which could have resulted in serious injury or death had a person, pedestrian, or oncoming vehicle been in front. This type of malfunction poses a critical risk of high-speed unintended collisions in public or residential areas. As of now, the problem has not yet been reproduced or confirmed by a dealer or service center, but further inspection is pending. I am requesting a full diagnostic evaluation, including electronic and mechanical systems related to throttle and braking. The vehicle has not yet been inspected by Mercedes-Benz, police, or insurance representatives, but the car is in the possession of a Mercedes’ collision center. NO, there were no warning lamps, messages, or unusual symptoms on the dashboard prior to the event. The vehicle gave no indication of mechanical or electronic failure before the sudden acceleration occurred.

Source: NHTSA complaint ODI #11677330 · view all complaints for this vehicle at nhtsa.gov

Dealership: Mercedes-Benz of Santa Fe, 2586 Camino Entrada, Santa Fe, NM 87507 I am filing this complaint regarding multiple unresolved safety defects in my 2024 Mercedes-Benz C300 persisting across numerous repair visits since February 2026. Defect 1 – Recurring Strut Assembly: Following an AC sensor replacement on February 11, 2026, a loud rattling noise emerged from the dashboard/strut area. The vehicle was retained 22 days without resolution. The strut plate was repaired, but the noise recurred. Parts were ordered for the strut assembly, requiring me to drive the defective vehicle for approximately two additional weeks. As of June 8, 2026, the noise remains unresolved. A defective strut assembly affects handling, stability, and steering — creating serious risk at highway speeds. Defect 2 – Safety Systems Disabled: Following the strut plate repair, all driver assistance systems — including collision avoidance and lane keeping — were completely disabled. A warning message confirmed the systems were inoperable. A subsequent software update was required to restore them. Defect 3 – Check Engine Light; Dealer Advised Continued Operation: While driving with the unrepaired strut assembly, the check engine light illuminated. I have photographic evidence. Service Manager Simon explicitly advised me it was safe to continue driving. I contest this. I was not provided a loaner vehicle. Inaccurate Service Records: On June 5, 2026, service notes falsely stated the check engine light was not illuminated. I presented photographic evidence to service representative Robert Rodriguez, who verbally confirmed the photograph. The record was not corrected, potentially obscuring defect patterns from NHTSA review. I respectfully request NHTSA add this complaint to the public database, investigate whether this model has a safety-related defect pattern, and review the dealership's practice of advising consumers to operate vehicles with known structural defects.

Source: NHTSA complaint ODI #11743560 · view all complaints for this vehicle at nhtsa.gov

While driving on the highway with the panoramic sunroof open, the glass suddenly shattered, sounding like a gunshot or an explosion. Shards of glass flew into the vehicle and rained down on me, creating a very hazardous driving situation. I did not observe any foreign object that could have caused the sunroof to break.

Source: NHTSA complaint ODI #11728393 · view all complaints for this vehicle at nhtsa.gov

The driver’s seat in my car moves backward on its own while I’m driving. I’ve taken the car to the dealership several times, but the issue still hasn’t been resolved. This is extremely dangerous and frightening. It has happened twice on the highway, Several times in the dealership’s garage, And most recently, while I was pulling out of a parking spot: Half of my car was still in the parking area and the other half was already in the street. The road had a curve, so other drivers couldn’t see me until they got very close, which could have caused a serious accident. This is a serious safety concern that needs immediate attention.

Source: NHTSA complaint ODI #11677176 · view all complaints for this vehicle at nhtsa.gov