Model-year record
2021 Mercedes GLB
See the complaints, recalls, crash rating, and fuel economy in the public record. Then check the mileage and history of the car you found.
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Complaints filed
1
Reports to NHTSA, 2021
Safety recalls
0
NHTSA campaigns on record
NHTSA crash test
Overall NCAP rating
Combined MPG
No data
EPA estimate
Known issues
Electrical System issues account for the largest share of owner complaints (100% of 1 reports).
Share of all 1 NHTSA complaints for this model year, grouped by the component owners named. Bars are scaled to the largest category. Examples: ODI 11742901.
Individual complaint reports(1)
Showing the 1 most recent reportsElectrical SystemJun 2026 · ODI 11742901Details +Close −
While driving on the highway at 70mph my transmission malfunction warning light illuminated in red and my vehicle went into limp mode, creating a life threatening safety defect at highway speeds. I immediately took the vehicle to Mercedes Benz of Pittsburgh. The dealer's own diagnostic tech notes stated 'software is in preparation for concern' confirming this is a known safety defect on Mercedes' end. The dealer was unable to replicate the concern or produce stored fault codes but acknowledged software is actively being developed to address this issue. I contacted MBUSA who confirmed the only escalation path available is a buyback, meaning Mercedes cannot provide a timeline for the software fix. I am currently unable to safely drive my vehicle and am requesting this be investigated as a potential safety defect that may affect other 2021 Mercedes GLB 250 owners.
- Reported
- Jun 2026
- Incident date
- May 2026
- Mileage
- Not provided
- Outcome flags
- None reported
Recalls
No recalls are listed for this model year as of Jul 2026. Recall records can change when NHTSA publishes new information.
A campaign can apply to this model year without being incomplete on a specific vehicle. Check the VIN with NHTSA or a dealer to confirm whether a particular car needs repair.
Investigations
0 NHTSA investigations on record
No investigations are on record as of Jul 2026. An empty record is not a clean bill of health.
Crash-test ratings
2021 Mercedes-Benz GLB-Class SUV 4WD NHTSA source
- Overall
- Frontal
- Side
- Rollover
2021 Mercedes-Benz GLB-Class SUV FWD NHTSA source
- Overall
- Frontal
- Side
- Rollover
Fuel economy by trim
No EPA fuel-economy record is available for this model year. Some trims and older vehicles were not tested or are not in the current EPA feed.
Before you buy
Useful next checks
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Compare the year-by-year record
Open another year for its own evidence-gated decision. TireKick does not crown a best year from raw complaint totals.
2021 Mercedes GLB: frequently asked
What does the complaint record show for the 2021 Mercedes GLB?
Owners filed 1 NHTSA complaints about the 2021 Mercedes GLB. This is raw owner-reported complaint volume with no production or exposure normalization, so it is not a reliability score or a best/worst-year ranking.
What are the most common problems on the 2021 Mercedes GLB?
The most-reported problem area is Electrical System (100% of complaints).
How many recalls does the 2021 Mercedes GLB have?
No safety recalls are on record for the 2021 Mercedes GLB as of Jul 2026.
What gas mileage does the 2021 Mercedes GLB get?
EPA fuel-economy figures for the 2021 Mercedes GLB aren't available yet.