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2012 Mercedes Benz Glk Class Recalls, Issues & Maintenance

The 2012 Mercedes Benz Glk Class has no open NHTSA recalls. Owners report 4 recurring issue clusters, led by “Fuel tank leak with gasoline odor when filling.” 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 2012 Mercedes Benz Glk Class.

Reported to NHTSA

Fuel tank leak with gasoline odor when filling

FUEL/PROPULSION SYSTEM

10 NHTSA complaints · 2017-04 → 2024-09

“THE GLK SMELLS LIKE GAS ANY TIME IT'S FUELED UP. I NEVER TOP IT OFF BECAUSE IF I DO, IT LEAKS FUEL UNTIL I GET DOWN TO 3/4 OF A TANK. I TOOK IT IN TO GET LOOKED AT AND THE DEALERSHIP WARRANTY DEPT. TOLD ME MY VIN NUMBER WAS NOT ONE OF THE ONES AFFECTED BY THE SAMEEXAT TYPE OF”
— Owner report, NHTSA ODI #11119889
“My 2012 GLK350 leaking gas from under the rear right passenger seat, where the gas cap located. we fill up gas when we came back to home and park in the garage gas smell was very strong We thought may be because of spill some gas while Pumping”
— Owner report, NHTSA ODI #11503713
“Every time the car's tank is filled with gas some leaks out on the ground. There is also a strong smell of gas in the cabin. I see there are many other complaints concerning this issue”
— Owner report, NHTSA ODI #11437808

Read all complaints on NHTSA →

Rear brake line corrosion and rupture

SERVICE BRAKES

2 NHTSA complaints · 2024-09 → 2025-11

“RUPTURE OF LEFT REAR AND LEFT FRONT BRAKE LINES 1/26/24,8/30/24. BOTH TIMES THE FAILURE WAS UNANNOUNCED WHILE DRIVING THE CAR AND PUT MY LIFE IN DANGER”
— Owner report, NHTSA ODI #11612830
“I brought my car in to my local mechanic and was told my rear suspension was corroded. He said it would cost around five thousand dollars to repair. I researched online and found mercedes did not have a recall but has extended the warranty and will cover the repair to the rear”
— Owner report, NHTSA ODI #11701710

Read all complaints on NHTSA →

Takata airbag recall replacement parts unavailable

AIR BAGS

132 NHTSA complaints · 2016-06 → 2020-01

“THE CONTACT OWNS A 2012 MERCEDES-BENZ GLK350. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBERS: 16V081000 (AIR BAGS) AND 19V010000 (AIR BAGS). THE PARTS FOR THE RECALL REMEDY WERE NOT AVAILABLE. THE CONTACT STATED THAT THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF”
— Owner report, NHTSA ODI #11256646
“TL* TAKATA RECALL. THE CONTACT OWNS A 2012 MERCEDES-BENZ GLK350. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBERS: 16V081000 AND 19V010000 (AIR BAGS). THE CONTACT STATED THAT THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR”
— Owner report, NHTSA ODI #11218343
“AIRBAGS STILL HAVEN'T BEEN FIXED YET! MERCEDES SAYING AIRBAGS AREN'T AVAILABLE YET, SO HOW LONG WE ARE GOING TO DRIVE THIS VEHICLE BEFORE HAPPEN TO MY WIFE, DAUGHTER OR MYSELF GET INJURED OR KILLED!!!”
— Owner report, NHTSA ODI #11192539

Read all complaints on NHTSA →

Sunroof glass panel shattering while driving

VISIBILITY/WIPER

2 NHTSA complaints · 2017-12 → 2021-01

“I WAS DRIVING WITH MY HEAT ON IN COLD WEATHER. I WAS IN MOTION WHEN I HEARD A LOUD POP. I WAS ON ROUTE 1 TRAVELING STRAIGHT ON THE ROAD. AT FIRST I THOUGHT IT WAS MY WINDSHIELD. THEN I HEARD A CRACKLING SOUND ABOVE ME. THE WHOLE FRONT PANEL SUNROOF NOW LOOKED LIKE CRACKLE GLASS”
— Owner report, NHTSA ODI #11057781
“I WAS DRIVING ON I35 AT THE SPEED LIMIT WHEN I HEARD A LOUD POP OVERHEAD. I WAS NOT SURE WHAT IT WAS, WONDERED IF IT WAS GUN FIRE. A FEW DAYS LATER WHEN I GOT IN MY VEHICLE, AND THE SUN WAS OUT, I WAS CLOSING THE SUNROOF COVER WHEN I NOTICED THAT THE GLASS WAS SHATTERED, PIECES”
— Owner report, NHTSA ODI #11390524

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 14, 2026. Investigation data refreshed Sep 14, 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)

12 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.

5

complaints mentioning a crash

0

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 2012 Mercedes Benz Glk 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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