The 2021 Mercedes-Benz GLB is associated with 7 official NHTSA owner defect complaints and 12 safety recall campaigns in the federal safety database. The most frequently reported component area is ELECTRICAL SYSTEM,ENGINE, accounting for 1 reports (14% of total complaints). EPA testing covers 3 certified vehicle configurations spanning 2l 4-cyl powertrain configurations. Gasoline and hybrid variants deliver 23 to 26 MPG combined. Detailed NHTSA crash-test ratings are not available in the current AutoUtility dataset for this model year.
Key Data Findings
- • NHTSA Owner Complaints: 7 reports
- • Safety Recall Campaigns: 12 campaigns
- • Top Reported Defect Area: ELECTRICAL SYSTEM,ENGINE (1 / 14%)
- • NHTSA Overall Safety Rating: Not rated by NHTSA
- • EPA Efficiency: 23–26 MPG (3 variants)
Data Note: Compiled directly from official NHTSA Office of Defects Investigation (ODI), NHTSA 5-Star Safety Ratings, and EPA FuelEconomy.gov databases.
| Variant | Engine | Drivetrain | Transmission | City | Highway | Combined | EV Range | Est. Annual Fuel Cost |
| GLB250 | 2L 4-Cyl | Front-Wheel Drive | Automatic (AM8) | 23 MPG | 31 MPG | 26 MPG | — | $2,900 / yr |
| GLB250 4matic | 2L 4-Cyl | 4-Wheel Drive | Automatic (AM8) | 23 MPG | 30 MPG | 26 MPG | — | $2,900 / yr |
| AMG GLB35 4matic | 2L 4-Cyl | 4-Wheel Drive | Automatic (AM8) | 21 MPG | 26 MPG | 23 MPG | — | $3,300 / yr |
Data Boundary Note: EPA specifications are shown by certified vehicle configuration. NHTSA complaints and recall totals are recorded at the model-year level across all configurations.
NHTSA 5-Star NCAP laboratory crash evaluations are not currently on file for the 2021 Mercedes-Benz GLB.
Active Driver Assistance Systems (NHTSA Recorded): Forward Collision Warning (FCW) is documented as Not Specified and Lane Departure Warning (LDW) is documented as Not Specified in official NHTSA records for tested 2021 Mercedes-Benz GLB models.
View complete 2021 Mercedes-Benz GLB crash test & safety breakdown →
Top Reported Problem Categories
Ranked by total consumer complaint submissions recorded by NHTSA
Data Attribution & Context: Complaints are self-reported by vehicle owners to NHTSA and represent unverified consumer submissions. Complaint volume does not equal a statistically controlled failure rate and is not adjusted for total vehicles sold or cumulative mileage driven.
View all 2021 Mercedes-Benz GLB problems & component breakdown (7 categories) →
Affected Component: LATCHES/LOCKS/LINKAGES:DOORS:LOCK
Defect Summary: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2020-2021 CLA, 2019-2022 A-Class, 2022-2023 C-Class, 2024 CLE, 2020-2026 GLA/GLB, and 2023-2024 GLC vehicles. Please refer to MBUSA's recall report for specific model information. The micro-switch in the driver's door lock may corrode and fail to detect an open door, preventing the electronic parking brake or "Auto-Park" feature from engaging automatically. This may result in a vehicle rollaway.
Free Manufacturer Remedy: Dealers will replace the driver's door lock, free of charge. Owner notification letters are expected to be mailed September 18, 2026. Owners may contact MBUSA customer service at 1-800-367-6372. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning July 31, 2026.
Affected Component: ELECTRONIC STABILITY CONTROL (ESC):CONTROL MODULE
Defect Summary: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 GLB250 vehicles. The Electronic Stability Program (ESP) unit may be damaged, which can result in disabled anti-lock brakes (ABS), disabled electronic stability control (ESC), and an electrical short circuit.
Free Manufacturer Remedy: Dealers will replace the ESP unit, free of charge. Owner notification letters were mailed October 28, 2022. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2022090009.
Affected Component: ELECTRICAL SYSTEM:SOFTWARE
Defect Summary: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2022 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, AMG GT-Class, C-Class, E-Class, S-Class, SL-Class, GLC-Class, CLS-Class, GLB-Class, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. An error in the communication module's SIM card software can cause a mobile network connection failure, disabling the emergency call (eCall) system.
Free Manufacturer Remedy: The communication module software will be updated through an Over-the-Air (OTA) update or by a dealer, free of charge. Owner notification letters were mailed July 8, 2022. Owner notification letters will be mailed in phases, on July 8, 2022, May 17, 2024, July 29, 2024, and September 27, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's numbers are for this recall is 2022060005 and 2023110006.
View all 2021 Mercedes-Benz GLB recalls & campaign history (12 campaigns) →