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2014 Mercedes Benz Glk Class Recalls, Issues & Maintenance

The 2014 Mercedes Benz Glk Class has no open NHTSA recalls. Owners report 6 recurring issue clusters, led by “Fuel system odor and leak.” 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 2014 Mercedes Benz Glk Class.

Reported to NHTSA

Fuel system odor and leak

FUEL SYSTEM, GASOLINE

8 NHTSA complaints · 2019-11 → 2026-07

“The contact owns a 2014 Mercedes-Benz GLK350. The contact stated while starting the vehicle after refueling, there was an abnormal gasoline odor inside the vehicle. The vehicle was taken to the dealer and the contact was informed that the fuel pump was leaking onto the rear seats”
— Owner report, NHTSA ODI #11526545
“My vehicle started smelling like gas. Took it in for inspection. Mechanic found a leak in the fuel assembly, resulting in gasoline pooling inside the vehicle under the back seat and leaking out through the bottom of the vehicle”
— Owner report, NHTSA ODI #11511839
“WE STARTED TO DEVELOP A STRONG SMELL OF GAS INSIDE THE VEHICLE. I STARTED TO RESEARCH ONLINE TO FIND THAT MANY MERCEDES MODELS HAVE THE SAME PROBLEM, A CRACK DEVELOPS ON A CAP THAT HOUSES THE FUEL PUMP UNDER THE BACK SEAT INSIDE THE VEHICLE”
— Owner report, NHTSA ODI #11394886

Read all complaints on NHTSA →

Takata passenger airbag recall parts unavailable

AIR BAGS

74 NHTSA complaints · 2018-11 → 2022-09

“MERCEDES RECALL NOTICE ISSUED MARCH, 2019. TO DATE, MERCEDES HAS NOT CONTACTED ME TO SCHEDULE RECALL REMEDY. IT HAS NOW BEEN OVER ONE YEAR SINCE I RECEIVED ORIGINAL NOTICE”
— Owner report, NHTSA ODI #11338124
“STILL NO REMEDY FOR MY MERCEDES-BENZ GLK350 4MATIC 2014”
— Owner report, NHTSA ODI #11349966
“I'VE BEEN WAITING FOR 18 MONTHS FOR MY AIRBAG TO BE REPAIRED. THE DEALER HAS NO IDEA WHEN THEY WILL RECEIVE THE PARTS. THIS IS RIDICULOUS, THIS IS A SAFETY ISSUE. *TR”
— Owner report, NHTSA ODI #11327980

Read all complaints on NHTSA →

Heated seat element burn-through

SEATS

3 NHTSA complaints · 2025-01 → 2026-05

“The contact owns a 2014 Mercedes Benz GLK. The contact stated he heating element burned through the front driver side seat. The vehicle was taken to the dealer where it was diagnosed with an internal fault in the driver seat back heater; however the vehicle was not repaired”
— Owner report, NHTSA ODI #11740866
“On 1/17/25, I was on my commute to my office when I noted a very strong and unpleasant odor. Thinking it was from a truck in front of me, I passed the truck, cracked my passenger window and continued the short distance to my office”
— Owner report, NHTSA ODI #11638529
“On January 01, 2025, I started my wife's car after adding coolant. I just want to warm it up since we did not use it in a couple of days. I activated the heated seat on the driver side where I was seated and was just looking at the dashboard”
— Owner report, NHTSA ODI #11633753

Read all complaints on NHTSA →

Sunroof glass shattering

VISIBILITY/WIPER

4 NHTSA complaints · 2016-07 → 2023-11

“On 11/18/2023, while driving my GLK350 2014, I decided to open and later close the sunroof. As I closed the sunroof, I heard a distinct cracking sound, which caught my attention. Initially, I was unsure of the source of the sound and continued driving”
— Owner report, NHTSA ODI #11555900
“The contact owns a 2014 Mercedes Benz GLK350. The contact stated while driving at various speeds, there was a loud sound coming from the sunroof. The contact stated that there was no warning light illuminated”
— Owner report, NHTSA ODI #11418042
“TL* THE CONTACT OWNS A 2014 MERCEDES-BENZ GLK350. WHILE DRIVING APPROXIMATELY 45 MPH, THE SUN ROOF SHATTERED. THERE WERE NO INJURIES. THE VEHICLE WAS TAKEN TO LOKEY AUTOMOTIVE GROUP (LOCATED AT 27758 US HWY 19 N, CLEARWATER, FL 33763, (727) 799-2151)”
— Owner report, NHTSA ODI #11242342

Read all complaints on NHTSA →

Unintended acceleration during low-speed maneuvering

VEHICLE SPEED CONTROL

3 NHTSA complaints · 2014-06 → 2023-01

“The contact owns a 2014 Mercedes Benz GLK250. The contact stated while driving at a slow speed and seeking a parking spot, the vehicle accelerated independently and caused her to crash into a parked vehicle. The contact stated no warning light was illuminated”
— Owner report, NHTSA ODI #11500787
“TL* THE CONTACT OWNS A 2014 MERCEDES-BENZ GLK350. THE CONTACT STATED THAT A WARNING LIGHT INDICATED A DANGER OF THE VEHICLE ROLLING OVER. THE CONTACT APPLIED THE ACCELERATOR PEDAL WHILE IN REVERSE, BUT IT DID NOT RESPOND AND THE WARNING LIGHT FLASHED”
— Owner report, NHTSA ODI #10872362
“TL* THE CONTACT OWNS A 2014 MERCEDES BENZ GLK350. THE CONTACT STATED THAT WHILE PARKING, THE VEHICLE SUDDENLY ACCELERATED WITHOUT ANY WARNING AND CRASHED INTO ANOTHER VEHICLE. THE CONTACT MENTIONED THAT SHE ENGAGED THE BRAKES BUT IT FAILED TO STOP THE VEHICLE”
— Owner report, NHTSA ODI #10606546

Read all complaints on NHTSA →

Brake system engagement and release malfunctions

SERVICE BRAKES

6 NHTSA complaints · 2014-10 → 2024-10

“IN DECEMBER 2019 I WAS ON THE EXPRESSWAY AND THE TRAFFIC WAS BUMPER TO BUMPER. I WAS DRIVING BEHIND A LADY AND WHEN SHE STOPPED I WENT TO PUT MY FEET ON THE BRAKES AND THE BRAKES WENT TO THE FLOOR AND MY CAR HIT HER”
— Owner report, NHTSA ODI #11363291
“The contact owns a 2014 Mercedes-Benz GLK350. The contact stated that the parking brake failed to engage as needed. There were no warning lights illuminated”
— Owner report, NHTSA ODI #11622865
“WE WERE DRIVING ON THE INTERSTATE IN THE MIDDLE OF DENVER WITH CRUISE CONTROL ON WHEN THE BRAKES ENGAGED. WE WERE ALMOST AT A COMPLETE STOP WHEN MY HUSBAND WAS ABLE TO GET THE CAR TO ACCELERATE AGAIN AND WE LUCKILY WERE NOT REAR ENDED”
— Owner report, NHTSA ODI #10884345

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 13, 2026. Investigation data refreshed Sep 13, 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)

10 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

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 2014 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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