2021 Mercedes-Benz Glb 250 4matic problems, complaints & recalls
Most-reported problem areas: Fuel/Propulsion System (1) · Engine (1)
Safety recalls (1)
Latches/Locks/Linkages:doors:lock 2026-07-24 · campaign 26V481000 · 310,667 vehicles
Defect: 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.
Risk: A vehicle rollaway increases the risk of a crash or injury.
Fix: Dealers will replace the driver's door lock, free of charge. Owner notification letters are expected to be mailed September 18, 2026. This will be a phased campaign, with the remedy becoming available in different phases based on model and model years. 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.
Service bulletins (60)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Steering 2026-09-26 · LI46.10-P-080896 · Service Bulletin/Repair Instructions
complaint slight creaking noises when steering. cause noises may come from one or more sleeves of the horn contact plate. remedy remove the horn contact plate and check the sleeves for noise; see attached video. if necessary, apply lubricant to the sleeves.
Service Brakes 2026-09-22 · LI42.10-P-078779 · Service Bulletin/Repair Instructions
complaint repeat workshop visit for vehicle vibration while braking from 60mph. note: although the symptom is similar to a tire or wheel vibration, it is usually readily noticeable that it is distinctly different if it happens at all times or only while braking. cause although the cause of the vibra
Electrical System 2026-09-15 · LI82.60-P-080383 · Service Bulletin/Repair Instructions
complaint radio station cover art does not refresh when switching stations. the ui continues to show the old station’s artwork instead of updating to the new one. cause when a new station change request is triggered, a temporary glitch is causing the head unit application to fail to overwrite the pr
Structure:body 2026-09-14 · LI82.62-P-078631 · Service Bulletin/Repair Instructions
complaint clanking noise from the area of the speakers in the doors. cause under analysis. remedy to narrow down the cause, first of all remove the door trim. • if the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary,
Power Train 2026-08-29 · LI 27.10-P-080851 · Service Bulletin/Repair Instructions
complaint intermittent shift feel or thud/clunk noise perceived, such as a brief jerk or transmission reaction during certain driving situations. may be most noticeable when transitioning from a coasting condition to accelerator pedal application. may occur in all drive modes. cause dual‑clutch tran
Electrical System 2026-08-29 · LI27.19-P-080869 · Service Bulletin/Repair Instructions
complaint temporary no start condition with check engine light and multiple warning messages. when performing a quick test, the following fault code is stored in y3/14 ‑ transmission control for 8‑speed dual‑clutch transmission (dkg): p24f100 the wake‑up line of the control unit has a short circuit
Showing the 6 most recent of 60 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-07-30 · Fuel/Propulsion System“as i was driving down road car began to lose power, check engine light came on and car went into limp mode. car was towed to nearest repair shop where analysis was made. i was advised to take to dealership for repair. advised that there was a service campaign issued by the manufacturer on glb class with m260 motors. see attached report. took car to…”
2026-06-09 · Engine“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' conf…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.