Mercedes-Benz GLB years to avoid

How we rated the best and worst Mercedes-Benz GLB years

The 2020 model year is the worst in the GLB lineup, scoring 59/100 on the reliability index primarily due to structure-related issues and elevated recall volume. To build this guide, we pulled data from NHTSA complaints and recalls, CarComplaints PainRank (which ranks a year’s worst-ness by repair cost and average mileage when problems appear), and the Auto Reliability Index (which aggregates NHTSA complaint and recall data into a 0-100 score). Our editorial guidelines govern how each source is weighted and attributed throughout this guide. These are different measures: CarComplaints rates 2021 as the worst year on repair cost and mileage-at-failure, while NHTSA raw complaint volume peaks on the 2020 GLB. They are not the same year, and each finding is attributed to its actual source throughout this guide.

Every Mercedes-Benz GLB model year ranked

The GLB is a single-generation model that launched for 2020 and received a mid-cycle facelift for 2024. The table below covers every model year in the NHTSA database.

Most common Mercedes-Benz GLB problems

The single biggest failure tied to this model is front axle carrier corrosion, which triggered a safety recall covering thousands of 2020 GLBs and set the tone for first-year quality concerns. Owners of early cars also report structural and body issues, electrical faults, MBUX software glitches, and panoramic sunroof failures.

1. Front axle carrier corrosion (structural failure)

Mercedes-Benz recalled 38,312 small cars and SUVs because the front axle carrier may corrode, causing it to fail, affecting steering ability and increasing the risk of a crash - and the part was found not to have adequate corrosion protection for the lifetime of the vehicle on certain A-Class and GLB-Class vehicles.

The recall covers the 2020 Mercedes GLB250, and a corroded carrier can cause trouble steering because it supports the front axle. The NHTSA campaign number for this recall is 21V-990. The integral carrier - essentially the subframe - is the central part of the front axle holding most suspension components in place, and the supplier did not apply enough corrosion protection, potentially causing it to corrode and break under load, which could cause the driver to lose control.

Dealers inspect and replace the integral carrier free of charge. If you are shopping a used 2020 GLB, confirm this repair is already done by having the dealer pull up the VIN service history before you sign anything. This is the most safety-critical defect in the GLB’s short history, and an unrepaired example is a genuine crash risk, not just a maintenance annoyance.

2. Panoramic sunroof shattering (2021)

CarComplaints rates 2021 as the worst GLB250 model year on overall complaints, and the most-reported problem for the 2021 GLB250 is the panoramic sunroof exploding while driving. Owners describe the glass detonating without warning, sometimes at highway speed, showering occupants and following traffic with shards.

This is a body component issue, not a recall-driven defect at the time of publication - so there is no free dealer fix waiting. Sunroof glass replacement at a Mercedes dealer typically runs in the range of several thousand dollars; specialty shops quote $4,000 to $8,000 or more for full replacement. On any used 2021 GLB with a panoramic roof, inspect the glass carefully for micro-cracks around the edges before buying, and ask the seller whether the sunroof has ever been replaced.

3. Rearview camera / MBUX display failure

The MBUX multimedia system software can cause the display to remain black or reboot after startup, which means the rearview camera image may not display properly - a violation of Federal Motor Vehicle Safety Standard 111, “Rear Visibility.” This issue is common across the 2020 and 2021 model years and is linked to NHTSA campaign 22V-232, which covers multiple Mercedes platforms including the GLB-Class.

The symptom is a black or cycling MBUX screen at startup. Dealers update the software or replace the display module. If you test-drive a used GLB, cycle the ignition a few times and confirm the backup camera displays immediately every time. A persistent black screen at purchase is a red flag that the recall repair has not been completed.

4. Electronic Stability Program (ESP) unit fault (2021)

On certain 2021 GLB vehicles, the Electronic Stability Program unit may have been damaged during production, with moisture potentially ingressing into the ESP control unit - which could deactivate vehicle stability control and ABS, and created a risk of fire due to an internal short circuit, increasing the risk of a crash or injury. NHTSA assigned this recall campaign 22V-679.

This is a low-probability but high-consequence fault. There are 10 recalls on record for the 2021 Mercedes-Benz GLB overall, and the ESP defect is among the most serious. The fix is dealer replacement of the affected control unit at no charge. Verify the recall is closed on any 2021 GLB before purchase.

5. Structural and body integrity issues (2020)

Based on NHTSA data, the 2020 Mercedes-Benz GLB had the highest combined complaint and recall count - 28 complaints and 12 safety recalls. Structure-related reports (13 incidents) are the primary driver of the 2020’s low reliability score. Complaints include water intrusion at the front footwell, loose body trim, and improperly installed rear spoilers.

A separate 2021 recall addressed 5,680 SUVs because water may seep into the front floor area, potentially damaging electronics and raising the risk of a stall - and that recall affects 2020 Mercedes GLB 250 SUVs. When inspecting a 2020 GLB, check under the driver’s and passenger’s floor mats for any sign of moisture or corrosion on the wiring harnesses near the firewall.

6. Electrical system faults (cross-generation)

The most frequently cited problem areas across all GLB model years in the NHTSA database are: Unknown/Other (17 reports), Structure (10 reports), Engine (9 reports), and Electrical System (6 reports). The most frequently reported problem areas on the 2020-2025 GLB-Class are body/trim, electrical system, and safety systems.

Electrical complaints include sensors triggering warning lights without a root cause, lane-keeping system errors, and forward collision avoidance false alerts - the last of which is the top complaint category for the 2022 model year. Most electrical faults are software-addressable, but out-of-warranty repairs can reach several hundred dollars per visit. Mercedes-Benz carries an average annual repair cost of $908, with a 13% probability of a repair being severe.

Which Mercedes-Benz GLB years should you avoid

The Mercedes-Benz GLB years to avoid are 2020 and 2021. Based on NHTSA data, the 2020 Mercedes-Benz GLB had the highest combined complaint and recall count - 28 complaints and 12 safety recalls, making it the highest raw-volume year by NHTSA’s measure. CarComplaints rates 2021 as the worst model year on repair cost and average mileage when problems occur, giving each source a different worst year - and both years earned their place on the avoid list.

Worst Mercedes-Benz GLB years: 2020, 2021

1st-generation Mercedes-Benz GLB (2020-2021)

The 2020 GLB had 19 recalls and 56 owner complaints on file, including severity signals: 2 crash-related complaints and 1 fire-related complaint. The NHTSA complaints page for the 2020 GLB shows structural concerns as the leading category, largely tied to the front axle carrier defect.

The 2021 GLB posted 10 recalls and 30 owner complaints, with the top problem areas being Unknown/Other (8), Electrical System (6), and Engine (4). The sunroof-shattering complaint and the ESP control-unit recall define the 2021 as the costlier year to own out of warranty, which is why CarComplaints assigns it the worst PainRank on repair cost and mileage-at-failure.

What are the best Mercedes-Benz GLB years to buy

The best Mercedes-Benz GLB years to buy are 2022 and 2023, both of which post significantly lower complaint and recall counts than the launch cars. The 2022 is the single standout pick.

Most reliable Mercedes-Benz GLB years: 2022, 2023

2022 Mercedes-Benz GLB

The 2022 Mercedes-Benz GLB carries 0 recalls and just 13 owner complaints, with 2 crash-related complaints as severity signals; the most commonly reported problem areas are forward collision avoidance (3 reports), vehicle speed control (2), and suspension (2). It earns the best reliability score of any GLB year at 75/100.

The 2022 also cleared the front axle recall window - that defect is specific to 2020 production and 2021 AMG GLB35 units, not the 2022 car. If your budget allows only one year, the 2022 is the cleanest pick in the current GLB lineup.

2023 Mercedes-Benz GLB

The 2023 scores 74/100 and continues the improvement trend. Complaint volumes continued to fall, and no major recalls burdened this model year at the time of writing. The 2023 also benefits from any software and quality tweaks Mercedes rolled in after the high-recall 2020-2021 period.

Complaint rates fell from 24.2 per 10,000 sold in 2020 to 2.7 per 10,000 in 2024, a trajectory that makes any 2022-or-later GLB a much lower risk than the launch cars.

Mercedes-Benz GLB submodel years to avoid

Both the GLB250 and the GLB35 AMG ride the same X247 platform as the standard GLB, but each has its own model-year span, engine, and fault record. Here is what the data shows for each, assessed on its own complaints and recalls.

Mercedes-Benz GLB250 years to avoid

The GLB250 is the base variant, powered by a 2.0-liter turbocharged four-cylinder engine, and it covers the full production run from 2020 onward. CarComplaints rates the 2021 GLB250 as the worst model year on overall complaints, repair cost, and average mileage when problems occur. The 2020 GLB250 carries its own distinct burden: it is the primary vehicle population inside NHTSA recall 21V-990. The 2020 GLB250 accounts for 21,219 vehicles in that front axle carrier recall.

The 2020’s structural issues - the axle corrosion recall, the water-intrusion recall, and the MBUX camera blackout campaign - are shared with the broader GLB range but land most heavily on the GLB250 because it was the only body style sold in 2020. The 2020 GLB250 logged 40 complaints and around 100 technical service bulletins, with problems appearing as early as 2,000 miles.

Pre-purchase checks specific to the GLB250:

• Confirm recall 21V-990 (front axle carrier) is closed on the VIN
• Check for the MBUX camera blackout under NHTSA campaign 22V-232
• On a 2021 GLB250, inspect the panoramic sunroof glass edges for micro-cracks - the most-reported problem for that year per CarComplaints

Mercedes-Benz GLB35 AMG years to avoid

The GLB35 AMG uses a different, higher-output 2.0-liter turbocharged four-cylinder (the M260 engine in AMG tune, producing 302 hp) paired with the same 8-speed dual-clutch automatic. The GLB35 AMG recall population inside NHTSA 21V-990 covers only 6 vehicles - all from the 2021 model year. That extremely small recall population means the front axle corrosion issue touches the GLB35 far less broadly than the GLB250, though any 2021 GLB35 should still be VIN-checked.

A separate recall covers 2021 GLB250 and AMG GLB35 vehicles where the driver-side window airbag may not have been mounted correctly to the lower area of the A-pillar, causing these vehicles to fail compliance with FMVSS 226, “Ejection Mitigation.” That airbag mounting recall is specific to the 2021 GLB35 and is not shared with later years. Beyond the launch-year recall cluster, no GLB35 AMG model year has yet accumulated enough complaint data to flag as a standalone avoid year. The GLB35 is low-volume compared to the GLB250, and its complaint record remains thin - which is a finding, not a gap. Buy the 2022 or 2023 GLB35 if one is in your budget, verify all 2021 recall campaigns are closed on any earlier car, and note that the SRS light illuminating after purchase could point back to the unrepaired airbag mounting issue on 2021 vehicles.

Mercedes-Benz GLB pre-purchase checklist

Before signing anything on a used GLB, run through these model-specific checks:

• Run the VIN through NHTSA’s recall checker: Confirm every open recall is closed, paying particular attention to recall 21V-990 (front axle carrier corrosion) on 2020 and 2021 models, and the airbag mounting recall on 2021 GLB35 AMG units.
• On any 2020-2021 GLB, ask for the recall service records: Dealers must document the integral carrier inspection and replacement - get the paperwork, not just a verbal confirmation.
• Test the MBUX camera at startup: Cycle the ignition three times and confirm the rearview camera displays immediately each time; a black or slow-loading screen signals an unresolved NHTSA 22V-232 campaign.
• Inspect the panoramic sunroof (2021 cars especially): Look at the glass edges under bright light for hairline cracks; the most-reported 2021 GLB250 problem on CarComplaints is the sunroof shattering while driving.
• Check under the front floor mats (2020 GLBs): A water-intrusion recall affected 2020 GLB250 units - dried moisture stains or corrosion on wiring near the firewall are red flags.
• Check ESP warning lights: On any 2021 GLB, an illuminated ESP or stability-control warning lamp may indicate the 22V-679 defective control unit was never replaced.
• Request full dealer service history: Any 2020-2021 GLB with less than 30,000 miles but no service records is a risk given how many early recalls required dealer visits.
• Budget for maintenance: The average annual repair cost for a Mercedes-Benz is $908; factor that into your total cost of ownership before committing.

Better alternatives to consider

If the GLB years in your budget fall on the avoid list, these same-segment compact luxury SUVs are worth cross-shopping:

• Audi Q3 - a direct competitor in the compact luxury SUV segment with a cleaner early-generation recall record than the 2020-2021 GLB
• BMW X1 - shares the compact luxury crossover space and the 2022-2023 years post strong reliability scores against the GLB’s weak launch window
• Volvo XC40 - consistently strong safety ratings from IIHS and fewer structural recalls than the first-year GLB, making it a lower-risk used purchase in the same price bracket
• Hyundai Kona - a non-luxury alternative at a lower price point with a longer production run and a clearer year-by-year reliability record for budget-conscious buyers

Is the Mercedes-Benz GLB worth buying

Yes - as long as you avoid the 2020 and 2021 model years. The GLB averages 69/100 across five model years, rated good, and complaint rates dropped from 24.2 per 10,000 sold in 2020 to 2.7 in 2024, showing real and sustained improvement. The 2022 earns the best score at 75/100 and carries zero recalls, making it the clearest safe buy. Stick to 2022 or 2023, run the VIN through NHTSA’s recall checker before purchase, and verify the maintenance history is complete - those two steps eliminate most of the risk this model carries. If you want to understand how which Mercedes class is the best overall for reliability and value, the GLB ranks as a practical mid-tier pick within the lineup.

Frequently asked questions

What are the best Mercedes-Benz GLB years to buy

The best Mercedes-Benz GLB years to buy are 2022 and 2023 - the 2022 earns the top reliability score of 75/100, and the 2023 follows closely at 74/100. Both years carry low complaint counts and minimal recall exposure compared to the 2020-2021 launch cars.

What are the worst years for the Mercedes-Benz GLB

The worst years for the Mercedes-Benz GLB are 2020 and 2021. The 2020 leads in raw NHTSA complaint volume with 28 complaints and 12 safety recalls, while CarComplaints rates the 2021 as the worst on repair cost and mileage-at-failure. The years to avoid methodology applied here weights both repair cost and complaint volume to flag model years that represent the highest ownership risk.

Which year Mercedes-Benz GLB is most reliable

The 2022 Mercedes-Benz GLB is the most reliable model year, with a reliability score of 75/100. It carries zero recalls and just 13 owner complaints on file, the cleanest record in the GLB’s production history.

What year Mercedes-Benz GLB has the worst front axle problems

The front axle carrier corrosion defect is tied to the 2020 GLB250 most broadly. Mercedes-Benz recalled 38,312 vehicles because the front axle carrier may corrode, causing it to fail and affecting steering ability, under NHTSA recall 21V-990. The 2020 GLB250 accounts for 21,219 of the vehicles in that recall population. Confirm the repair is completed on any 2020 or recalled 2021 GLB before purchase.

How long does a Mercedes-Benz GLB last

The GLB carries an average reliability score of 69/100 and an estimated annual repair cost of $908, with a medium reliability rating of 3/5 - it is best suited for owners who prioritize spaciousness and luxury but should be aware of potential early-life defects. With proper maintenance and a clean ownership history, a well-kept GLB from a good model year (2022 or later) can be expected to reach 150,000 miles or more, in line with other compact luxury SUVs in its class.