Used Mercedes-Benz GLB-Class — common problems and service

Yes, 2020-2021 GLB models are covered by NHTSA recall 21V-990 for corrosion of the front axle integral carrier, and rerev.com lists it as the top failure for those years. Symptoms include structural weakening of the front axle mounting points, which can lead to loss of steering control, component detachment, or increased crash risk. Before buying, check the VIN through the NHTSA recall checker and inspect the front axle carrier for corrosion or evidence of replacement. No specific repair cost is documented in the research, but it is considered a high-cost structural repair.

The 2021 GLB-Class is specifically flagged for sunroof failure, with CarComplaints ranking that model year worst for repair cost. Symptoms include the sunroof failing to open or close, water leaks into the cabin, or glass and mechanism breakage, which can lead to interior water damage, electrical short circuits, and potential safety hazards. No precise repair cost is given in the research, so only a high-cost estimate is implied.