What are the most common Mercedes-Benz GLB problems?
According to Au7o's analysis of 1,800+ owner reports, the 2020 Mercedes-Benz GLB has 9 documented issues. The most frequently reported are: Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246), Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990), M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss). Of these, 3 are rated critical and should be addressed promptly.
Is the Mercedes-Benz GLB reliable?
The 2020 Mercedes-Benz GLB has 9 known issues documented across 1,800+ owner reports. 3 issues are rated critical: Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246) and Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990) and M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mercedes-Benz GLB problems?
Repair costs for known Mercedes-Benz GLB issues range from $0 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2020 Mercedes-Benz GLB Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246)?
Certain early 2020 GLB 250 4MATIC bodies were not sealed properly during manufacturing, allowing water to enter through the front wheel-well area into the front-occupant footwells. The water can reach and damage electrical components, resulting in the instrument cluster going bla… Repairs typically run $0-$0. Severity: high.
What is the 2020 Mercedes-Benz GLB Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990)?
On certain 2020 GLB 250 vehicles, the integral carrier that supports the front axle may corrode, which can cause it to fail. A failure of the front axle carrier can compromise steering and suspension integrity and increase the risk of a crash. This is covered by NHTSA recall 21V9… Repairs typically run $0-$0. Severity: high.
What is the 2020-2022 Mercedes-Benz GLB M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss)?
The 2.0L turbo M260 four-cylinder used in the GLB 250 / GLB 35 (and the M264-related variants) suffers from premature wear of the exhaust valve seats and valve guides. The exhaust valves stop sealing, causing loss of compression in one or more cylinders, rough running and misfire… Repairs typically run $0-$6,000. Severity: high.
What is the 2020-2025 Mercedes-Benz GLB 8G-DCT Transmission Shudder?
The 8G-DCT dual-clutch transmission exhibits shudder and hesitation during low-speed maneuvers and from a standstill. While improved over the earlier 7G-DCT, the 8G-DCT still uses a wet clutch design that can judder when the clutch packs wear or the software calibration is outdat… Repairs typically run $150-$2,500. Severity: medium.
What is the 2020-2022 Mercedes-Benz GLB Emergency Call (eCall) System Disabled by Communication Module SIM Software Error (Recall 22V365)?
An error in the communication module's embedded SIM-card software can cause a loss of mobile-network connection on GLB-Class vehicles, which disables the automatic emergency call (eCall / Mercedes me emergency) function. In a crash the vehicle may fail to automatically alert emer… Repairs typically run $0-$0. Severity: medium.
What is the 2020-2024 Mercedes-Benz GLB Carbon Buildup on Intake Valves (Direct-Injection M260) Causing Rough Idle and Power Loss?
Like other Mercedes direct-injected turbo engines, the M260 in the GLB (and the 1.3L M282 in the GLB 180/200) accumulates carbon deposits on the intake valves and intake tract over time because fuel is injected directly into the cylinder and never washes the back of the valves. T… Repairs typically run $300-$600. Severity: medium.
What is the 2020-2021 Mercedes-Benz GLB Rearview Camera Fails to Display (Black Screen) Due to Software Error (Recall 22V232)?
Many 2020-2021 GLB-Class vehicles can fail to show the rearview camera image when reversing; instead the driver sees a black screen or the previous view plus a message that the rearview camera is inoperable. The defect is a software error affecting vehicles built with certain sup… Repairs typically run $0-$0. Severity: medium.
What is the 2020-2025 Mercedes-Benz GLB MBUX Infotainment Freeze?
The MBUX system freezes, reboots, or displays glitches. Apple CarPlay and Android Auto connections trigger instability in the head unit, and the voice assistant ("Hey Mercedes") intermittently stops responding. Repairs typically run $0-$1,500. Severity: low.
What is the 2020-2025 Mercedes-Benz GLB Panoramic Sunroof Creak?
The panoramic sunroof develops creaking and popping noises, particularly in temperature extremes and over rough roads. The large glass panel flexes differently than the metal roof structure, creating friction at the seal interfaces. Repairs typically run $0-$400. Severity: low.
