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2020 Mercedes Benz Glb Class Recalls, Issues & Maintenance

The 2020 Mercedes Benz Glb Class has no open NHTSA recalls. Owners report 6 recurring issue clusters, led by “Rear spoiler and exterior trim detachment while driving.” Mercedes-Benz alternates two service events: Service A (oil, filter, inspection) at roughly 10,000 miles or 1 year, then Service B (Service A plus brake fluid, cabin filter, and deeper checks) at roughly 20,000 miles or 2 years — the ASSYST Plus counter in the cluster tells you which is due. Oil must carry the MB-Approval number your engine specifies (commonly 229.5, or 229.71 for newer 0W-20 engines); 'meets or exceeds' marketing language is not an approval. Electric EQB and EQS models keep the A/B rhythm for inspections, brake fluid, and cabin filters — just without oil.

No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2020 Mercedes Benz Glb Class.

Reported to NHTSA

Rear spoiler and exterior trim detachment while driving

STRUCTURE

12 NHTSA complaints · 2020-07 → 2025-08

“The contact owns a 2020 Mercedes-Benz GLB250. The contact stated while driving 45 MPH, the rear spoiler detached from the vehicle. There were no warning lights illuminated”
— Owner report, NHTSA ODI #11615360
“WHILE DRIVING ON THE HIGHWAY AT 79 MPH THE WHOLE VEHICLE SHUTTERED AND THEN THE BACK OF THE VEHICLE EXPLODED. THE REAR SPOILER ASSEMBLY FLEW OFF IN PIECES”
— Owner report, NHTSA ODI #11385562
“I am submitting this formal complaint regarding a serious safety incident involving my 2020 Mercedes-Benz GLB, which directly reflects the defect outlined in Recall 20V-480 (Rear Spoiler Detachment)”
— Owner report, NHTSA ODI #11678410

Read all complaints on NHTSA →

Dashboard and instrument cluster electrical failures

ELECTRICAL SYSTEM

4 NHTSA complaints · 2020-07 → 2023-09

“ON FRIDAY 7/17/2020 AROUNDNOON, I WASDRIVING MYMB GLB THAT WAS BOUGHT LESSTHAN90 DAYS AGO WHEN SUDDENLY THE DASHBOARD WENT BLANK. I COULD NOT SEE SPEED, GAS GAGES OR ANY OTHER SAFETY FEATURES THAT WOULD BE ON THE DASH”
— Owner report, NHTSA ODI #11340435
“I EXPERIENCED AN INCIDENT WITH MY RECENTLY PURCHASED GLB 250 THAT MIRRORS EXACTLY THE 20200070009 RECALL THAT DOES NOT COVER MY VIN. AFTER RUNNING THE VEHICLE THROUGH A CAR WASH, THE DASHBOARD INSTRUMENT CLUSTER WENT BLANK, WITH NO ABILITY TO DETERMINE SPEED, FUEL LEVELS, ETC”
— Owner report, NHTSA ODI #11406659
“My GLB250 does not fall under recall 2020070009 however after taking it through the car wash the entire display instrument went out and car will not turn on and off”
— Owner report, NHTSA ODI #11545725

Read all complaints on NHTSA →

Engine failure and stalling

ENGINE

6 NHTSA complaints · 2024-03 → 2026-08

“Complete engine failure mid driving on highway. NO engine light prior to complete engine failure. Vehicle has been towed to two different Mercedes Benz auto dealerships”
— Owner report, NHTSA ODI #11757113
“Engine failure. Engine has no compression which is causing injection fueler to fail. The head engine has gone bad at 50,000 miles. Head engine must be replaced and is on back order per Mercerdes Benz”
— Owner report, NHTSA ODI #11575249
“Car constantly cuts out and loses power as well as occasionally shuts off for no reason. Causing very hazardous driving conditions”
— Owner report, NHTSA ODI #11617187

Read all complaints on NHTSA →

Airbag warning light malfunctions

AIR BAGS

5 NHTSA complaints · 2020-03 → 2026-05

“my car has only 24533 miles and Air bag malfunction message is showing up”
— Owner report, NHTSA ODI #11734342
“GOT WARNING LIGHT ON IN DECEMBER 7TH 2020 SAYING "FRONT RIGHT AIRBAG MALFUNCTION". TOOK CAR FOR SERVICE AND APPARENT SOLVED ISSUE. TODAY DECEMBER 17TH 2020 THE PROBLEM IS BACK AGAIN”
— Owner report, NHTSA ODI #11383890
“FOUR WEEKS AGO I TURNED ON MY CAR AND SAW A WARNING LIGHT THAT SAID "LEFTSIDE CURTAIN AIRBAG MALFUNCTION". I IMMEDIATELY CALLED THE MERCEDES 800 NUMBER AND THEY TRANSFERRED ME TO MY LOCAL SERVICE CENTER”
— Owner report, NHTSA ODI #11361424

Read all complaints on NHTSA →

Front axle and steering control failures

STEERING, SUSPENSION

4 NHTSA complaints · 2022-02 → 2025-01

“The contact owns a 2020 Mercedes Benz GLB250. The contact stated that while her husband was driving at approximately 45 mph and merged to the left, the driver was losing control of the steering and crashed into the meridian”
— Owner report, NHTSA ODI #11451402
“The integral carrier that supports the front axle caused it to fail. Front axle carrier failed and resulted in a loss of steering control, and hit the curb”
— Owner report, NHTSA ODI #11461636
“CV joint axle. This car does not maintain its lane. Drives misaligned and sounds like there is a cracking noise like something is breaking under driverside steering wheel”
— Owner report, NHTSA ODI #11633560

Read all complaints on NHTSA →

Fuel system leaks and odor

FUEL SYSTEM, GASOLINE

3 NHTSA complaints · 2021-02 → 2024-02

“TL* THE CONTACT OWNS A 2020 MERCEDES-BENZ GLB250. THE CONTACT STATED THAT THERE WAS AN ABNORMALLY STRONG SMELL OF GASOLINE INSIDE OF THE VEHICLE. WHILE THE CONTACT'S SON WAS ABOUT TO ENTER THE VEHICLE, HE BECAME AWARE OF A LARGE AMOUNT OF GASOLINE LEAKING FROM THE VEHICLE”
— Owner report, NHTSA ODI #11395972
“The contact owns a 2020 Mercedes-Benz GLB250. The contact stated that there was an abnormal fuel odor inside the cabin of the vehicle. There were no warning lights illuminated”
— Owner report, NHTSA ODI #11570269
“The contact owns a 2020 Mercedes-Benz GLB250. The contact stated while driving at approximately 30 MPH the vehicle had started shaking as if the engine was going to stall. The contact stated the check engine light was illuminated”
— Owner report, NHTSA ODI #11489214

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 11, 2026. Investigation data refreshed Sep 11, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Essential maintenance

Critical for safety and preventing major damage

Service A — Oil & Filter + Inspection

Every 10,000 mi

Every 10,000 miles or 12 months: oil and filter with MB-Approved oil, fluid top-offs, tire check, and inspection. AMG models driven hard: many owners service at 5,000-7,500 miles.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

Service B — Major Inspection

Every 20,000 mi

Every 20,000 miles or 2 years, alternating with Service A: everything in A plus brake-fluid replacement, cabin filter, and a deeper multi-point inspection of brakes, suspension, and driveline.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free with any paid service. A flashlight and 10 minutes covers the basics yourself.

Tire Rotation

Every 10,000 mi

Rotate at every Service A where the tire sizes allow. Many AMG and 4MATIC+ models run staggered widths that can't rotate front-to-rear — check your spec before paying for a rotation.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

Brake Inspection

Every 10,000 mi

Checked at every A/B service via electronic pad-wear sensors. Replace sensors with pads. Heavy EQS models wear pads slowly (regen braking) but rotors can corrode from disuse — an inspection catches that.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

Brake Fluid

Every 20,000 mi

Replaced every 2 years as part of Service B — Mercedes schedules it on time, not miles, because DOT 4 fluid absorbs moisture regardless of driving.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

Important maintenance

Keeps your vehicle running smoothly and efficiently

Automatic Transmission Fluid (7G / 9G-Tronic)

Every 70,000 mi

Mercedes specifies fluid and filter service around 70,000 miles on most 7G- and 9G-Tronic gearboxes — check your year's sheet. Use only the MB-spec fluid for your transmission code; independent specialists often service at 60,000 on hard-driven cars.

Estimated cost — typical U.S. ranges

Dealer

~$330–$500

Shop

~$235–$355

DIY

~$60–$180

Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.

Spark Plugs

Every 60,000 mi

Most modern MB gas engines: plugs around 60,000 miles — AMG engines often sooner. Check your engine's sheet; twin-turbo V8 plug jobs are labor-heavy, so pair with other scheduled work.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

Engine Air Filter

Every 40,000 mi

Replace around every 40,000 miles (twin-filter setups on V6/V8 engines double the parts bill). Inspected at every Service B.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

Recommended maintenance

Extends the life of your vehicle and improves comfort

Combination / Dust Filter

Every 20,000 mi

Replaced with every Service B. Models with the ENERGIZING air package use a higher-grade filter — priced accordingly.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

Engine Coolant

On condition / lifetime

MB-spec coolant is long-life (typically ~10 years / 150,000 miles on the sheet). Refresh only with MB 325/326-spec coolant — the wrong chemistry attacks aluminum and head gaskets.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

12V & Auxiliary Battery

Every 25,000 mi

Test annually after year 3. Most modern Mercedes carry a second auxiliary battery; a weak one triggers cascading warning messages long before a no-start. EQ models also depend on the 12V system to boot.

Estimated cost — typical U.S. ranges

Dealer

~$225–$390

Shop

~$160–$280

DIY

~$130–$250

Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

2 crashes 2010–2024

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

2

complaints mentioning a crash

1

complaints mentioning a fire

Reviewed known issues for this vehicle

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2020 Mercedes Benz Glb Class reflects Mercedes-Benz's published service intervals and the ASSYST Plus (Service A / Service B) system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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