2020 Mercedes-Benz GLB 2.0L Petrol · D3 LTA

The MFA2 front axle uses a stamped integral carrier that links the subframe, suspension mounts and steering rack. On early GLBs the corrosion protection was inadequate, so after several years of UK winter road salt the carrier scales and the mounting points weaken. DVSA lists recall R/2023/185 for 4,148 UK GLBs with the remedy being replacement of the front axle carrier, mirroring the NHTSA action covering 38,312 US A-Class and GLB cars. Failure of the carrier means sudden loss of steering control, so treat heavy rust here as structural.

The GLB's 7G-DCT (GLB 180/200) and 8G-DCT (GLB 250, 220d, AMG 35) are prone to harshness at walking pace, and early UK cars were called in under three separate DVSA campaigns for dual-clutch oil level being outside specification, one of which replaced the gearbox outright. Mercedes has no gearbox-fluid change interval, so by 70,000 miles the fluid that cools the clutches and actuates the mechatronic unit is degraded, which shows as shudder, hesitation from first gear and flare-ups on the 1-2 or 2-3 change. A mechatronic or clutch-pack repair runs into four figures.

DVSA campaign R/2024/166 covers 18,969 UK GLBs built on the MFA2 family because the fallback level of the electric power-steering software did not meet specification: if an independent hardware fault occurs, steering assistance can be impaired and a loss of steerability cannot be excluded. Car-Recalls.eu shows the same campaign running to 528,640 right-hand-drive A-Class, B-Class, CLA, EQA, EQB, GLA and GLB cars built from 2017 to 2024, monitored by the KBA. The fix is a software update, so an unremedied car is both a safety risk and a resale problem.