Every record we hold for this vehicle, as plain tables, with nothing added. The consumer page shows the same records with the maintenance schedule, price ranges and nearby shops around them.
vehicle
2021 / mercedes-benz / glb-class
known issues
6 clusters (reviewed 2026-08-21)
complaints
2 on file (2026-06-09 → 2026-07-30)
recalls
0
investigations
0
fars
1 occupant deaths, crash years 2010-2024 (legacy-code)
M260 engine failure and cylinder head defectENGINE, FUEL/PROPULSION SYSTEM9 complaints2022-06 → 2026-07glb-2021-engine-failure-m260
11660562 On 4/13/25 while driving my car on the highway, along with my 2 young children, I began to hear what initally sounded like a "flapping" noise. I rolled the windows down and after a minute or 2 the sound got lounder. There was never a warning or any type of safety icon
11668223 In April 2025, my 2021 Mercedes-Benz GLB 250 (81,000 miles) suffered repeated engine issues caused by a cylinder head failure. The dealer attempted a cylinder head replacement, but during their own test drive after repairs, the engine completely seized and failed again
11520946 The car has 29,000 miles and I took it on a two day trip across part of the country. It was driven hard but had a oil change before leaving. After arriving home it started to sputter and have no "energy". I had the cabin filter and engine filter changed and another oil change…
Panoramic sunroof spontaneous shatteringUNKNOWN OR OTHER6 complaints2022-09 → 2026-08glb-2021-panoramic-sunroof-shattering
11704359 Driving on north bound of Merritt Parkway between exit 17 and 18. Today 12/10/25 9:28 AM My panoramic sunroof exploded ! all catch on video, driver on the vehicle behind me , came to check on me; and told me the glass went over four feet up in the air and then hit…
11734501 Family and I were driving on the interstate and heard a loud bang (like a shotgun) followed by immediate glass everywhere. The panoramic sunroof exploded. We had to drive 4 hours like this - lucky we didn’t jerk the wheel on the interstate with the noise
11483597 On September 3, 2022 while traveling east on AL highway 110 the sunroof exploded as i was driving. Notified Montgomery county sheriff Department but they refuse to do a report because it wasn’t an accident. The dealership said something had to hit the sunroof for it to Shadder
Transmission malfunction warning and limp modeELECTRICAL SYSTEM, ENGINE3 complaints2026-02 → 2026-06glb-2021-transmission-limp-mode
11742901 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
11721700 When my car sits in the rain for long periods of time, while driving, it will automatically switch into neutral and give me a "transmission malfunction stop" & "service required do not shift gears visit dealer" sign on the dash. This has happened at least 7 times in 2 years…
Front axle and suspension clunk or separationSUSPENSION, POWER TRAIN4 complaints2022-12 → 2025-11glb-2021-front-axle-suspension
11496487 Front right ball joint separated from lower control arm with no advance warning and the drive shaft was disconnected from the vehicle body. I was travelling at about 15 mph in a straight line through an intersection on a flat surface with no potholes. Then I saw a warning of a…
11667631 The contact stated that while reversing down the driveway at approximately 4 MPH, the contact turned the steering wheel to the left and the vehicle started losing motive power. The contact stated that the RPMs were extremely high and the vehicle almost stalled
11701110 one of our vehicles, a 2021 mb glb250 has recently developed severe clunking, thumping, and loud cracking noises originating from the front axle area, noticeable especially at low speeds. The problem appeared suddenly and is rapidly worsening
Stationary roof panel and windshield glass crackingVISIBILITY3 complaints2023-04 → 2026-08glb-2021-stationary-roof-panel-windshield
11756454 The contact stated that the front stationary roof panel detached from the vehicle and shattered. The vehicle was taken to the dealer but was not diagnosed or repaired. The contact became aware of a recall with a similar failure; however, the VIN was not included
11516008 I heard a loud pop or bang sound coming from the top middle area of my windshield. I checked for any windshield damage, observed none. I thought the whole noise strange as nothing had hit my car or windshield. A couple days later I noticed that the glass panel between the…
Electrical system failure with water intrusionELECTRICAL SYSTEM, STRUCTURE:BODY, AIR BAGS2 complaints2023-10 → 2023-10glb-2021-electrical-water-intrusion
11551607 Entire electrical system went out while driving causing check engine light to come on after the failure of system; there was no dashboard working at all when the system went out; without the dashboard out it was not certain if the vehicle was safe to drive anymore; the dealer…
11533526 The horn randomly starts honking while driving posing a serious safety risk. it makes driving the vehicle seem like it is stolen
FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road.
Cite this
Derived data is CC BY 4.0. Link back to the page you used. Text and BibTeX below.
Wrench.Pro (2026). 2021 Mercedes-Benz GLB-Class vehicle data [dataset]. https://www.wrench.pro/data/vehicles/2021/mercedes-benz/glb-class
@misc{wrenchpro_2021_mercedes_benz_glb_class_2026,
author = {Wrench.Pro},
title = {Wrench.Pro vehicle data: 2021 Mercedes-Benz GLB-Class},
year = {2026},
howpublished = {\url{https://www.wrench.pro/data/vehicles/2021/mercedes-benz/glb-class}},
note = {Derived from NHTSA public records. CC BY 4.0.}
}
