2019 Mercedes-Benz GLS 450 problems

Filed Oct 31, 2026 · Electrical · CO

A silica bag has burst inside the coolant system, contaminating the entire engine and disabling all heating and defrosting capabilities at only 40,000 miles. Estimates for the fix over $13,000.

Filed Oct 27, 2026 · Electrical · CO

The AC/Heating control unit failed prematurely at 40,000 miles, causing a complete loss of cabin heat and windshield defrosting capabilities. This creates a severe visibility and driving hazard in freezing weather, and risks the safety of a dependent child with high medical vulnerabilities.

Filed Sep 2, 2026 · Transmission · 56,000 miles · PA

The contact owns a 2019 Mercedes-Benz GLS450 4Matic. The contact stated that vehicle was taken to the dealer for routine service, and it was discovered that the U-joint on front driveshaft was fractured and needed to be replaced. The contact associated the failure with the federal safety agency Campaign Number: 26V216000 (Power Train); however, the VIN was not included in the recall. The failure mileage was approximately 56,000.

Filed Aug 25, 2026 · Transmission · CA

the vehicle suffered a sudden and catastrophic engine failure while being driven on the freeway at about 60mph. The engine seized and the vehicle lost propulsion creating a serious safety concern

Filed Jun 22, 2026 · Body · NJ

The front vehicle hood keep saying it open but is lock keep getting a message saying is open I am afraid is might come out lock and cause me to an accident

Filed May 22, 2026 · Engine · NJ

I am reporting a serious safety defect in my 2019 Mercedes-Benz GLS450. My vehicle experienced low oil pressure warnings and engine warning lights, which were diagnosed as a faulty oil pump solenoid valve. The repair required removing major engine components, resulting in a cost of $5,000 that I paid personally. It is important to note that Mercedes-Benz updated the valve design in the following model year, indicating that the company was aware of a defect in the original design. This demonstrates that the failure is recurring and not isolated, creating a serious safety risk—low oil pressure can lead to catastrophic engine failure while driving, endangering the driver and passengers. I request that the federal safety agency: Document this as a potential safety defect. Investigate the prevalence of this issue. Consider initiating a recall or safety notice for affected GLS450 vehicles.

Filed Feb 16, 2026 · Transmission · CA

When I attempt to shift from park to to drive or reverse or even neutral the car wont respond. this has happened a couple of times in the last two months. I press on the brake in order to shift and it wont respond to any commands . I then have no choice but to turn off the car and then turn it back on. that usually works. this is unsafe if i was at an open parking lot or even on the street doing a U-turn and I don't turn right then having to reverse and the car doesn't respond. very scary stuff.

Filed Nov 14, 2025 · IA

The panoramic sunroof spontaneously shattered while driving down the road. The glass blew out from the inside out. There didn't appear to be any issues with the sunroof before this. As far as safety, just the noise of the explosion was enough to surprise the driver causing a jerking of the steering wheel into the opposite lane of traffic which could have caused a head on collision. If the sunroof shade would have been open, the glass would have came down the drivers and passengers as they were going down the road. Saying this was distracting is an understatement. I called the local Mercedes dealership and was completely dismissed by them. They said it would have to be repaired by a glass company which is incorrect. The glass was replaced by the local collision center.

Filed Jun 10, 2025 · Airbags · FL

Shows an error on the dashboard: 3rd Row, Right Malfunction Consult Workshop

Filed Dec 6, 2024 · Engine · 91,000 miles · NC

The contact owns a 2019 Mercedes-Benz GLS450. The contact stated upon starting the vehicle, the check engine warning light illuminated intermittently. The contact stated that the failure had become consistent. The vehicle was taken to the dealer, where it was diagnosed that the engine oil pump valve and the camshaft adjuster had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 91,000.