2020 Mercedes-Benz GLB Reliability Report

Owners of the 2020 Mercedes-Benz GLB frequently report issues with airbag malfunctions, often indicated by warning lights for various airbags, including the front right and left curtain airbags. These warnings sometimes recur even after dealership repairs, suggesting persistent problems. One report describes a crash where side airbags failed to deploy, resulting in two injuries, indicating potential safety risks. Complaints often arise at relatively low mileages, such as 24,533 miles, and some owners experience these issues within the first weeks of ownership. Buyers considering a used GLB should be aware of these airbag system concerns and verify if repairs have been effectively addressed.

Owners report several engine-related issues with the 2020 Mercedes-Benz GLB, predominantly involving the engine head and valves. Complaints frequently mention problems such as the vehicle cutting out, losing power, and occasionally shutting off unexpectedly, which create hazardous driving conditions. These issues are often noted to occur around the 40,000 to 50,000-mile mark. Multiple owners describe a knocking sound and a lack of engine compression, which leads to engine failure, and some report the need for engine head replacement, which can be delayed due to parts being on back order. Safety implications include potential loss of vehicle control, though no crashes or fires are reported. Buyers should be aware of these patterns and consider the potential for costly repairs and safety risks.

Owners of the 2020 Mercedes-Benz GLB frequently report issues related to the steering system. Multiple complaints describe symptoms such as the vehicle not maintaining its lane, a cracking noise near the driver's side steering wheel, and the vehicle feeling misaligned. These issues are noted shortly after purchase and at mileage around 22,300. A significant safety concern is highlighted by a report of a crash where the driver lost control of the steering, resulting in a collision with a meridian, and the front axle fracturing and detaching. Buyers should be aware of these issues, especially considering the unresolved recall related to steering and suspension components.

Owners report issues with the suspension of the 2020 Mercedes-Benz GLB, including squeaky noises from the front and rear suspension/control arms during turns or when driving over speed bumps. Another significant issue involves the integral carrier supporting the front axle, which may corrode and fail, potentially leading to a loss of steering control. This is noted in a recall affecting certain vehicles, with owners having been notified of the safety risk. The complaints do not specify mileage ranges, but the safety implications include the risk of losing steering control, which could increase the likelihood of a crash. Buyers should be aware of these potential issues and verify if recall remedies have been applied.

Owners of the 2020 Mercedes-Benz GLB250 report issues related to abnormal fuel odors and gasoline leaks, with symptoms including a strong smell of fuel inside the cabin and visible fuel leakage. These issues are noted at mileage as low as approximately 11,820 miles and as high as 54,000 miles. Some owners also describe engine shaking and stalling, with the check engine light illuminating, which was diagnosed as related to faulty fuel injectors and a gas cap. Safety implications are implied with the presence of fuel odors and leaks, but no reports of crashes or fires are mentioned. Buyers considering this vehicle should be aware of these potential fuel system issues, especially at higher mileages.