*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Seat belts
We recently noticed visible damage to one of the seatbelts in our 2025 Mercedes-Benz GLS450. The affected component is the seatbelt webbing. The belt has visible fraying and pulled/cut fibers along the edge in two separate spots near the area where the belt retracts. The vehicle is very new, and the damage appears abnormal for a safety-related component. The damage is localized near the belt path/retractor area, and we are concerned it may be related to an issue with the seatbelt path, retractor mechanism, surrounding trim, alignment, or another defect in the restraint system. The component is available for inspection upon request. This creates a safety concern because the seatbelt is a…
Jun 17, 2026Service brakes
Brake pads completely worn after 11K miles - this seems like premature wear and like there is a potential issue with the braking system on the GLS450.
May 25, 2026SteeringCrash
Accident report: Local ID [XXX] Agency: ISPLowell 13 Date [XXX] Time approx [XXX] Milepost [XXX] on [XXX] Auto: 2025 Mercedes GLS 450 fully loaded Single car accident See attached pictures for damage State Farm insurance - claim filed (claim # [XXX]) Claim filed with Mercedes Benz on 3/9/2026 to access info from event data recorders (claim #[XXX])a total loss Driverâs 2 front airbags deployed - chest and legs. Driver was in left lane with no traffic around - slight drizzle Car started to move a bit in between the lane markers as if the lane assist was engage and trying to keep the car in the lane Driver had both hand in the wheel and was paying attention - tried to stabilize the wheel…
Mar 5, 2026Electrical system
The contact owns a 2025 Mercedes-Benz GLS450 4Matic. The contact stated that while driving at various speeds, a safety feature with a white speed limit sign started flashing on the instrument cluster. The contact stated the flashing was a constant issue. The vehicle was taken to the local dealer several times. The contact was informed by the dealer that it was a known issue and that the manufacturer was still developing a fix. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was 5,265.
Nov 10, 2025 · 5,265 milesService brakes
I am writing to file a formal complaint regarding a serious malfunction of the Automatic Emergency Braking (AEB) system. This malfunction caused my vehicle to unexpectedly perform an emergency stop without a valid cause, resulting in significant damage to its suspension system. Incident Details: â¢Date of Incident: Friday, December 5, 2025, between 10:45 am and 11:15 am ET â¢Location: Community Baptist Church of Englewood, 224 1St, Englewood, New Jersey. â¢Description: While driving under normal conditions on a clear, dry road with no obstructions, the vehicle's AEB system engaged suddenly and forcefully. The abrupt, maximum-force braking caused severe stress and impact on the vehicle's…
Dec 5, 2025Visibility › Sun/moon roof assembly1 injury
The contact owns a 2025 Mercedes-Benz GLS450. The contact stated that while driving approximately 50 MPH, a loud popping noise had occurred, and suddenly the panoramic glass sunroof exploded, causing shards of glass to fall into the cabin of the vehicle. During the incident, shards of glass contacted the driver, front seat passenger, and middle row passenger located on the driver's side. The driver sustained lacerations to the left hand and neck, which would require medical treatment. The children were traumatized by the event. The cause of the failure was not determined. The manufacturer and local dealer were notified of the failure. The failure mileage was 10,000.
Nov 13, 2025 · 10,000 milesEngine
The contact owns a 2025 Mercedes-Benz GLS450 4Matic. The contact stated that while driving at an undisclosed speed, the engine overheated, with several unknown warning lights illuminated. The vehicle was taken to the dealer, where it was diagnosed that the coolant pump had failed and needed to be replaced. The vehicle was repaired. The contact then stated that while driving at an undisclosed speed, there was a metallic clicking sound was coming from the engine compartment, and there were no warning lights illuminated. The contact stated that the front of the vehicle near the instrument panel was very hot. The vehicle was taken back to the dealer, where it was not diagnosed or repaired. The…
Oct 8, 2025 · 14,050 miles
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.