Used Mercedes-Benz GLB Buying Guide: 2020-2026 Years to Target

For most people the used Mercedes-Benz GLB to buy is a 2021-2023 GLB250 with 4Matic and dealer service records, or a 2024 and newer car if you want the refreshed cabin and 48-volt mild hybrid. Be careful with a 2020: it was the launch year and carries the longest recall list, including footwell water leaks and a front axle carrier that can corrode. Whatever year you pick, check the VIN for the driver-door-lock rollaway recall, which covers 2020 through 2026 GLBs and is still being rolled out in phases.

I pulled the GLB's recalls from the NHTSA API and reread Car and Driver's GLB pages on Saturday afternoon, October 17, 2026. The timing is relevant because Mercedes is about to replace this generation: C/D's 2027 preview describes an all-new GLB with a hybrid 1.5-liter, so the car you are shopping is the outgoing one.

What you get in a first-generation GLB

The GLB arrived for 2020 and slots between the GLA and the GLC. C/D's 2020 review notes it is an inch shorter than a GLC but offers an optional third row that neither the GLC nor the GLA has. The GLB250 uses a 221-hp turbocharged 2.0-liter four and an eight-speed dual-clutch automatic, with front- or all-wheel drive. C/D's lows from that first year still hold: "Expensive to upgrade, engine lacks power, limited third row passenger space." That third row is for kids. It is useful in a pinch, but you should not plan a carpool around it.

The AMG GLB35 came for 2021. On the 2021 AMG page, C/D lists 302 hp and a 4.9-second run to 60 mph, and complains about a "stiff-legged ride" and fussy infotainment. Its test car had the third row as an $850 option, which tells you it was not standard there either. Count the seats before you believe a listing that says "7-passenger."

For 2024 the GLB got a refresh. The 2024 page lists new headlights and taillights, revised front and rear styling, an updated interior, a standard 10.3-inch touchscreen with newer software, and a 48-volt hybrid-assist system. Output stayed at 221 hp and 258 lb-ft. Warranty is 4 years or 50,000 miles, with no free maintenance, so a 2020 or 2021 is long past it.

GLB recalls to check by VIN

• 26V481, 2020-2026: a micro-switch in the driver's door lock can corrode and fail to detect an open door, so the electronic parking brake or Auto-Park may not engage and the car can roll away. The NHTSA record covers 310,667 Mercedes vehicles, says owner letters were expected September 18, 2026, and calls it a phased campaign, so the fix may not be ready for your car yet.
• 21V990, 2020 GLB250 and 2021 AMG GLB35: the integral carrier that supports the front axle may corrode and fail, which can mean a loss of steering control. The record lists 38,312 vehicles, with dealers inspecting and replacing the part as needed.
• 20V246 and 21V403, 2020: water can get in through the wheel well into the front footwells and damage electronics. The listed symptoms are a blank cluster, a stall or a car that will not start. If a 2020 has a musty carpet or new floor mats, ask why.
• Air bags, 2020-2021: 20V628, 21V404, 21V405, 21V639 and 21V860 cover window and curtain air bag mounting, the passenger cushion, and control-unit software.
• Others: 20V558 (second-row seat may not lock), 20V480 and 21V231 (spoilers that can detach), 21V232 (wheel arch covers), 22V078 (wrong driver air bag module on some 2021s) and 24V780 (sidewall damage on the right-side tires of 416 new 2025 cars).

One annoyance is that NHTSA files the GLB under several names, including GLB250, GLB 250 4MATIC, GLB 250 and AMG GLB35, and model-year searches are patchy. My 2022 search returned nothing at all, even though 26V481 covers that year. So check by VIN, not by model name.

GLB, GLA or something else

Honestly, the GLA and GLB are the same idea in different shapes. Our used Mercedes GLA buying guide covers the lower, sportier one, and C/D's 2024 page admits "the GLA-class looks cooler" while the GLB wins on cargo space. If you need real adult room, the used Mercedes GLC guide is the next size up. Outside Mercedes, C/D says the 2027 GLB's second row should be similar to a Volvo XC40's, and our used Volvo XC40 buying guide covers that rival.

As for the new one, C/D's 2027 preview expects a second generation with a 208-hp hybrid 1.5-liter, standard all-wheel drive and an optional third row, plus an electric GLB that replaces the EQB. Prices are estimates for now. Do not let a dealer sell you a 2026 at 2027 money.

Before you pay luxury-brand money

Start with our Mercedes VIN decoder post or NHTSA's free vPIC tool to confirm 250 versus AMG 35 and FWD versus 4Matic, then follow our Mercedes-Benz recall check by VIN guide. A 2020 with water-leak history deserves a look under the carpet, and a full history report will show whether earlier owners had electrical repairs. Check NMVTIS for title brands too. We have seen sellers forward edited report PDFs, so buy your own. CarVins is a licensed reseller of CARFAX and AutoCheck reports and has no affiliation with CARFAX, AutoCheck, Experian or Mercedes-Benz. In mid October 2026 one report runs about $5.50 as a guest or $4.50 as a member here, and a bundle of both is near $6.75. Buying direct costs roughly $39.99 to $44.99. Confirm at checkout, because prices shift.

Sources

• Car and Driver: 2020 GLB, 2021 AMG GLB35, 2024 GLB, 2027 GLB preview
• NHTSA recall records 26V481 and 21V990
• NHTSA vPIC and NMVTIS