There are 1 owner-reported powertrain & transmission complaints for the 2020 Mercedes-Benz GLB-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
The contact owns a 2020 Mercedes-Benz GLB250. The contact stated while the vehicle was at a stop light, the accelerator pedal was depressed however, the vehicle lunged backward. There was no warning light illuminated. The contact depressed the brake pedal to stop the vehicle. The vehicle was restarted; however, the failure recurred. The vehicle was taken to the dealer but was not diagnosed or repaired. The contact was informed by the dealer that the failure could not be duplicated. The manufacturer was made aware of the failure. The approximate failure mileage was 50,307.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026