The vehicle presented multiple warnings/errors before shutting down on the street in traffic on June 23, 2026. Warnings such as Collision Detected, Blind Spot Assist and Exit Warning Inoperative, PRE-SAFE Inoperative, System Failure Detected, Service Required Do Not Shift Gear, along with various lights on the dashboard which includes the Check Engine Light. The vehicle was towed to local Mercedes Benz dealership which reported the issue was with a drive train module that required a software update, the update was performed and vehicle was returned to me on June 25, 2026. On June 28, 2026 the warnings Blind Spot Assist and Exit Warning Inoperative, and PRE-SAFE Inoperative messages returned. Then on July 13, 2026 the vehicle shut down completely again in the same manner and error messages as initially reported. The vehicle was then towed to another dealership who reported seeing the same error messages, however they have not been able to replicate the issue after resetting the software.

Source: NHTSA complaint ODI #11751243 · view all complaints for this vehicle at nhtsa.gov

My 2024 Mercedes-Benz GLC 300 has experienced multiple serious safety-related malfunctions involving several vehicle systems. In August, after picking up the vehicle from service, I placed my [XXX] grandson in his car seat, set my purse with the key inside the vehicle, and closed the rear door. The vehicle immediately locked all doors on its own, trapping my grandson inside in approximately 88-degree temperatures. I was unable to gain access for about 30 minutes. This created a dangerous child safety situation. Key fob periodically will lock you out of car. The following day, while driving approximately 35 mph with my [XXX] grandson in the vehicle, the car suddenly and violently applied the brakes and tightened the seatbelt without warning or any obstacle present. The vehicle came to a complete stop in the roadway. I later experienced bruising and increased neck pain afterward. I have also experienced repeated power liftgate malfunctions. While loading groceries, the liftgate failed to recognize my presence and closed on me unexpectedly, striking my head. The vehicle was brought in for service in November regarding this issue. Additionally, while driving on the highway, both side mirrors have suddenly folded inward without warning on several occasions, causing immediate loss of visibility and creating a serious driving hazard. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Source: NHTSA complaint ODI #11736573 · view all complaints for this vehicle at nhtsa.gov

2. Service Department Misconduct —XXX Appointment On XXX, I brought my vehicle to the dealership’s service department for a pre-scheduled and confirmed appointment regarding a safety-related warning involving the emergency brake system. Despite having provided a full description of the issue at the time of booking, I was informed upon arrival that the diagnostic process would take more than five hours. When I asked about a loaner vehicle — standard practice at Mercedes-Benz dealerships in cases of extended service — I was refused, even though five courtesy vehicles were visibly parked on the lot and at least two other customers who arrived after me were provided loaners and expedited service that same day. I was made to wait in the lobby for the entire day. At approximately 5:00 p.m., just before closing, and despite no diagnostic work having been performed on my vehicle, a loaner vehicle was suddenly made available to me. This inconsistent and apparently discriminatory treatment in the allocation of loaner vehicles and service priority is unacceptable and warrants review. 3. Lack of Communication and Missing Documentation Following Service The technician assigned to my vehicle, [XXX], told me he would call me on Monday, XXX, once diagnostics were complete. He did not call. Instead, I received only an automated text message on Tuesday, XXX, stating the vehicle was ready — with no phone call, no email, and no explanation or summary of the work performed, contrary to standard practice at other Mercedes-Benz dealerships I have used. When I called to follow up, the technician did not answer despite multiple voicemails. I called the service department directly and asked for a supervisor; none was made available. After approximately one hour of calling the main dealership line, a sales associate attempted to reach the service department on my behalf and also received no answer. I then reached the technician directly. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Source: NHTSA complaint ODI #11759873 · view all complaints for this vehicle at nhtsa.gov

Passenger backseat seatbelt would not release under any circumstance. I tried turning the car off and on again. Checking settings on the screen and even releasing the seat a bit. Pushing the red button on the buckle did nothing. Pulling did nothing. Eventually had to cut the seatbelt to get the passenger out. And it is still stuck in the buckle.

Source: NHTSA complaint ODI #11613147 · view all complaints for this vehicle at nhtsa.gov

The rear lift gate closes unexpectedly when standing behind the vehicle and loading or unloading the cargo area. The keyless soft close activates even though there is no foot movement, or when there is minimal movement. This happens without warning. On several occasions this has happened to me, and also to my wife. It has caused minor bruises, but more importantly we are both older and it has been difficult extricating ourselves and reaching the control to raise the gate again. While there have been no falls yet, it's only a matter of time before someone loses their balance or is hurt in some other way. This has been reviewed by the local dealer's service department who says there is nothing wrong. It has also been discussed with an engineer at Mercedes with no result.

Source: NHTSA complaint ODI #11749171 · view all complaints for this vehicle at nhtsa.gov