What is the 2020 Mercedes-Benz GLB Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990)?

Recall 21V990 directly covers 21,219 model-year 2020 GLB 250 vehicles whose front-axle integral carrier may have insufficient corrosion protection. After several years and under specific environmental influences, corrosion may impair structural durability or connections to other… Severity: high.

What is the 2020-2022 Mercedes-Benz GLB M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss)?

Mercedes-Benz extended the exhaust-valve-system warranty to 15 years or 150,000 miles for certain model-year 2020-2022 GLB 250, GLB 250 4MATIC and AMG GLB 35 vehicles. The notice identifies valve-guide and/or seat-ring wear from increased lateral forces, which can cause cylinder… Severity: high.

What is the 2021 Mercedes-Benz GLB Driver Airbag Module Not Built to Specification (Recall 22V078)?

Mercedes-Benz determined that a number of Model Year 2021 GLB-Class (X247) vehicles may have left the plant with a driver airbag module that does not conform to specification. Because the module is not to spec, correct deployment behavior in a crash cannot be assured, which is a… Repairs typically run $0-$0. 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 2021 Mercedes-Benz GLB Rear Axle Headlamp Level Sensor Linkage Misinstalled, Causing Headlights to Aim Upward When Loaded (Recall 22V314)?

On certain 2021 GLB (X247) vehicles the ride-height level sensor linkage at the rear axle - the input the automatic headlamp leveling system uses to work out how far the tail has squatted - was not installed correctly at the factory. With the linkage mounted wrong, the system rea… Repairs typically run $0-$0. 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)?

Recall 22V232 directly covers 15,787 model-year 2020-2021 GLB 250 vehicles and 177 model-year 2021 AMG GLB 35 vehicles whose rearview-camera software may fail to show the required image after reverse is selected. The center display may instead retain the previous image or show a… Severity: medium.

What is the 2024-2026 Mercedes-Benz GLB 48-Volt Lithium-Ion Battery Reinitialization Communication Fault Draining the 12V Battery (Service Campaign 2025100004)?

The facelifted GLB (2024 onward) gained a 48-volt mild-hybrid system with a second-generation belt-driven starter-generator (RSG), so the car now depends on a small 48V lithium-ion battery for engine restarts, coasting, and recuperation in addition to the conventional 12V battery… Repairs typically run $0-$600. 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.

What is the 2020 Mercedes-Benz GLB Rear Brake Pad Wear Inspection Gauge Omitted From Vehicle (Recall 23V732)?

The GLB250, like its A-Class/CLA/GLA platform mates, uses an electronic wear sensor on the FRONT brake pads only; the REAR pads have no sensor and are meant to be checked mechanically using a small inspection gauge supplied with the vehicle, with the procedure documented in the o… Repairs typically run $0-$800. Severity: low.

What is the 2021-2025 Mercedes-Benz GLB AMG GLB35 Front Brake Squeal Under Light Braking (TSB Pad Replacement and Bed-In)?

AMG GLB35 owners report a loud squeal from the brakes when coming to a stop under light pedal pressure, present from delivery and persisting well past the break-in period. The AMG uses a higher-friction pad compound on larger front rotors than the GLB250, and that compound plus t… Repairs typically run $0-$600. Severity: low.

Mercedes-Benz · Known Issues

2020-2026 Mercedes-Benz GLB Problems & Issues

2020-2026 model years · 1,800+ owner reports · Updated August 2026

Share:@au7o.io

According to Au7o's analysis of 1,800+ owner reports, the 2020-2026 Mercedes-Benz GLB has 16 documented known issues, with 6 rated critical. The most serious are Fuel Rail-to-Injector Seal Leak Allowing Gasoline Into the Engine Bay (Recall 21V961) ($0-$0 repair), ESP/ABS Control Unit Damage Disabling Stability Control and Anti-Lock Brakes (Recall 22V679), Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990), Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246), M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss) and Driver Airbag Module Not Built to Specification (Recall 22V078) ($0-$0 repair). The most commonly reported issue is 8G-DCT Transmission Shudder with 800 owner reports. Across all issues with published estimates, repair costs range from $150 to $2,500. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Mercedes-Benz GLB problems?

According to Au7o's analysis of 1,800+ owner reports, the 2020-2026 Mercedes-Benz GLB has 16 documented issues. The most frequently reported are: Fuel Rail-to-Injector Seal Leak Allowing Gasoline Into the Engine Bay (Recall 21V961), ESP/ABS Control Unit Damage Disabling Stability Control and Anti-Lock Brakes (Recall 22V679), Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990). Of these, 6 are rated critical and should be addressed promptly.

Is the Mercedes-Benz GLB reliable?

The 2020-2026 Mercedes-Benz GLB has 16 known issues documented across 1,800+ owner reports. 6 issues are rated critical: Fuel Rail-to-Injector Seal Leak Allowing Gasoline Into the Engine Bay (Recall 21V961) and ESP/ABS Control Unit Damage Disabling Stability Control and Anti-Lock Brakes (Recall 22V679) and Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990) and Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246) and M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss) and Driver Airbag Module Not Built to Specification (Recall 22V078). 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 $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Fuel Rail-to-Injector Seal Leak Allowing Gasoline Into the Engine Bay (Recall 21V961), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Mercedes-Benz GLB is the most reliable?

Reliability varies across model years of the Mercedes-Benz GLB. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2020-2026 Mercedes-Benz GLB with 16 documented issues documented across 1,800+ owner reports.

All 16 Known Issues

Other Mercedes-Benz Models

Frequently Asked Questions

What are the most common Mercedes-Benz GLB problems?

Is the Mercedes-Benz GLB reliable?

How much does it cost to fix common Mercedes-Benz GLB problems?

What year Mercedes-Benz GLB is the most reliable?

Water Intrusion Into Front Footwells Causing Blank Instrument Cluster or Engine Stall (Recall 20V246)#

Rearview Camera Fails to Display (Black Screen) Due to Software Error (Recall 22V232)#

48-Volt Lithium-Ion Battery Reinitialization Communication Fault Draining the 12V Battery (Service Campaign 2025100004)#

MBUX Infotainment Freeze#

ESP/ABS Control Unit Damage Disabling Stability Control and Anti-Lock Brakes (Recall 22V679)#

Rear Brake Pad Wear Inspection Gauge Omitted From Vehicle (Recall 23V732)#

AMG GLB35 Front Brake Squeal Under Light Braking (TSB Pad Replacement and Bed-In)#

Driver Airbag Module Not Built to Specification (Recall 22V078)#

Rear Axle Headlamp Level Sensor Linkage Misinstalled, Causing Headlights to Aim Upward When Loaded (Recall 22V314)#

Emergency Call (eCall) System Disabled by Communication Module SIM Software Error (Recall 22V365)#

M260 Cylinder Head Exhaust Valve Seat/Guide Wear (Misfires, Compression Loss)#

Carbon Buildup on Intake Valves (Direct-Injection M260) Causing Rough Idle and Power Loss#

Fuel Rail-to-Injector Seal Leak Allowing Gasoline Into the Engine Bay (Recall 21V961)#

Front Axle Carrier (Integral Carrier) Corrosion / Failure (Recall 21V990)#

8G-DCT Transmission Shudder#

Panoramic Sunroof Creak#

What is the 2020 Mercedes-Benz GLB Fuel Rail-to-Injector Seal Leak Allowing Gasoline Into the Engine Bay (Recall 21V961)?

What is the 2021 Mercedes-Benz GLB ESP/ABS Control Unit Damage Disabling Stability Control and Anti-Lock Brakes (Recall 22V679)?