2018 Mercedes-Benz GLC-Class Body & Structure Problems

While driving on interstate 4 in Florida with our grandchildren going approximately 70 mph the sunroof on our 2018 Mercedes GLC just exploded no object came into the vehicle and while glass came into the vehiclenot all the glass that made up the sunroof came into vehicle suggesting a pressure issue as apparently blew out

What component or system failed or malfunctioned, and is it available for inspection upon request? 2018 Mercedes-Benz GLC 300 Panoramic stationary sunroof between the windshield and sunroof glass panel disbonded while vehicle was in operation and almost caused an accident on the highway. How was your safety or the safety of others put at risk? Exterior panel disbonded while in operation and almost hit vehicles behind and could have caused an accident. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes diagnosis from the dealership that panel was coming loose. Then upon picking up my vehicle, panel disbonded on the highway. Dealer is Mercedes-Benz of Atlanta South. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? No inspection only completed by local Dealership. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? Excessive wind noise inside the cabin during vehicle operation. In addition, my year, make and model vehicle has already had a recall regarding this issue, however, Mercedes did not identify my vehicle VIN number for this recall and is refusing to repair this safety issue. But the exact issue occurred on my vehicle. The NHTSA campaign numbers for the two recalls are 17V715000 (MBUSA number 2017110009) and a revised campaign in 2021 21V197 (MBUSA number 2021070010), which states “Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 GLC300, GLC300 4Matic, and GLC43 AMG vehicles. The fixed panoramic sunroof frontal and side plastic panels may have insufficient bonding, allowing the panels to separate during vehicle operation”. Warning signs for these recalls are “high wind noise inside the cabin” which is EXACTLY what was diagnosed on my vehicle by the dealership. Please contact Mercedes-Benz and require them to re-assess the VIN numbers identified with the recalls.

In May 2023 a black plastic portion of the roof blew off the car. The plastic part that blew off was around the sunroof. There was no wind or blow to the car or anything like that; there was no prior warning or error message; there were no symptoms in advance. The part simply blew off the vehicle. The part is not available for inspection. Others were put at risk because the portion that blew off could have hit them or their vehicles. If the parts obstructed someone's view, there could have been an accident. The dealer has inspected and recently repaired the vehicle and can confirm the incident. No others such as the manufacturer, police, or insurance representatives have inspected the vehicle.

Driving at 70MPH on interstate and glass on top of roof in front of sunroof became separated and flew off of car. Part appears to be named Cover OSR. Our safety was not at risk however part breaking off at highway speed could have caused accident for a vehicle behind us or caused injury if someone was struck by the part. When the part became detached, there is no longer a seal to prevent water or debris from entering into the roof of the car. Independent service center stated to take car to dealership repair. Has not been scheduled yet. It has not been inspected yet. There was excess noise prior to the part breaking loose.

The contact owns a 2018 Mercedes-Benz GLC300. The contact stated while stopped in a parking lot, she raised the automatic liftgate, as she helped her husband load his walker into the rear cargo area of the vehicle, and the tailgate independently closed with force. The contact stated that both her husband and herself were struck on the top of the head by the liftgate. The contact stated that there was a pain but no physical injury was sustained. The contact stated that the failure had become constant and she no longer operated the liftgate. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the liftgate motor needed to be replaced. The vehicle had not been repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 35,000.

Panoramic Sunroof exploded while driving out of the blue. No other cars in front of me or near me. Nothing hit it.

WHILE DRIVING ON THE HIGHWAY MY SUNROOF SUDDENLY EXPLODED.

TL* THE CONTACT OWNED A 2018 MERCEDES-BENZ GLC300. WHILE DRIVING 55 MPH, THE REAR DRIVER'S SIDE TIRE WAS PUNCTURED. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED WITH 18 INCH RUN FLAT TIRES. THE CONTACT PULLED THE VEHICLE OVER TO THE SIDE OF THE ROAD. AFTER WAITING APPROXIMATELY 70 MINUTES ON THE SIDE OF THE ROAD, THE TIRE BURST INTO FLAMES. THE CONTACT WAS UNABLE TO PROVIDE THE TIRE MANUFACTURER, TIRE LINE, COMPLETE TIRE SIZE, OR DOT NUMBER. THE CONTACT STATED THAT THE FIRE ORIGINATED IN THE WHEEL WELL OF THE VEHICLE AND WAS NOT NECESSARILY CAUSED BY THE TIRE PUNCTURE. THE FIRE DEPARTMENT WAS CONTACTED AND WAS ABLE TO EXTINGUISH THE FIRE. A FIRE REPORT AND A POLICE REPORT WERE FILED. THE VEHICLE WAS DESTROYED AND TOWED FROM THE SCENE. THERE WERE NO INJURIES SUSTAINED. THE DEALER AND THE MANUFACTURER WERE NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 1,110.