Mercedes-Benz GLB Common Problems

STRUCTURE

Owners of the 2020 Mercedes-Benz GLB frequently report issues with the rear spoiler detaching, particularly while driving, which poses a potential road hazard as it can become airborne. These incidents are often linked to a recall, although some vehicles experiencing the issue are not officially included in the recall range. Complaints typically occur around 12,000 to 47,000 miles. Additionally, a few reports mention problems with the front bumper trim and fender flare detaching while driving, which could also pose safety risks if these parts fall off at high speeds. Buyers considering a used model should be aware of these structural issues and verify whether recall repairs have been completed.

UNKNOWN OR OTHER

Owners of the 2020 Mercedes-Benz GLB report several issues, with a notable instance involving a vehicle fire that occurred while the car was parked and warming up, resulting in total vehicle loss and home damage. Multiple owners describe problems with the sunroof and front glass panels, with reports of shattering without impact. Complaints also frequently mention liftgate malfunctions, where the liftgate does not retract adequately, leading to an injury in one case. Additionally, some owners report persistent unpleasant odors from the air conditioning system and transmission issues, such as unexpected shifting into neutral while driving. These issues appear across various mileage ranges, with some occurring at low mileages, indicating potential early-life defects. Safety concerns are evident, particularly with the fire and transmission failure, which could pose risks if they occur under different circumstances.

Severity signals: 0 crash, 1 fire, 1 injury reports

ELECTRICAL SYSTEM

Owners report that the 2020 Mercedes-Benz GLB frequently experiences electrical system issues, particularly involving the dashboard display going blank. Complaints often describe instances where the instrument cluster becomes non-functional, preventing visibility of speed, fuel levels, and other critical information, with some incidents occurring after exposure to water, such as a car wash. Several owners note problems with the control module for air conditioning and persistent check engine lights, with some issues manifesting at low mileages, such as 1,200 to 1,500 miles. Safety implications include moments when the car cannot be turned on or off, or when the vehicle is unable to shift gears, posing potential hazards during driving. These patterns suggest that prospective buyers should be aware of possible unresolved recall issues related to electrical components and water ingress.

UNKNOWN OR OTHER

Owners report two primary issues with the 2021 Mercedes-Benz GLB: spontaneous sunroof shattering and engine performance problems. Multiple complaints describe the panoramic sunroof unexpectedly exploding, resulting in glass falling into the vehicle, with incidents occurring while driving at highway speeds. Additionally, several owners mention engine issues, including jerking, rough idling, and loss of power, with some reports indicating metal particles in the oil and the need for engine replacement. These problems often manifest around 29,000 miles, posing potential safety risks such as loss of control and possible injury from shattered glass. Buyers should be aware of these reported issues when considering this model.

AIR BAGS

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.

Severity signals: 1 crash, 0 fire, 2 injury reports

ELECTRICAL SYSTEM

Owners of the 2021 Mercedes-Benz GLB frequently report issues with the vehicle's electrical system. Common symptoms include the horn randomly honking while driving, potentially causing confusion and safety risks. Some owners experience complete electrical system failures while driving, leading to a non-functional dashboard and uncertainty about the vehicle's safety. Reports also mention a transmission malfunction warning light triggering a limp mode at highway speeds, with ongoing software development to address this issue. Additionally, there are complaints about delays in recall repairs related to electrical system components, although some owners have not experienced failures. These issues often occur at varying mileages, and the safety implications include potential loss of vehicle control and increased risk during highway driving.

ENGINE

Owners report several engine-related issues with the 2021 Mercedes-Benz GLB, including catastrophic engine failure and cylinder head problems. Complaints frequently mention symptoms such as engine shaking, loss of power, excessive noise, and engine lights turning on. These issues appear to occur at mileage as low as 35,000 miles, with some owners experiencing complete engine replacements. Safety implications are noted, as one owner describes losing power on the interstate, leading to a challenging and potentially dangerous situation to maneuver the vehicle to safety. Potential buyers should be aware of these issues and the associated repair costs, as well as the reported difficulties in obtaining satisfactory resolutions from dealerships and the manufacturer.

ENGINE

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.