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2012 Mercedes Benz Ml Class Recalls, Issues & Maintenance

The 2012 Mercedes Benz Ml Class has no open NHTSA recalls. Owners report 7 recurring issue clusters, led by “Oil leaks into engine wiring harness and camshaft failure.” 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 Ml Class.

Reported to NHTSA

Oil leaks into engine wiring harness and camshaft failure

ENGINE

6 NHTSA complaints · 2015-12 → 2025-01

“My vehicle cut off on me 3 times twice while stationary and once at an intersection. Found oil in engine control module due to failed cam position sensors”
— Owner report, NHTSA ODI #11637887
“The contact owns a 2012 Mercedes-Benz ML350. The contact stated while driving uphill at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended”
— Owner report, NHTSA ODI #11628291
“OIL WAS LEAKING FROM THE ENGINE WHICH WAS THE RESULT OF A FAULTY PART THAT MERCEDES HAS SUBSEQUENTLY REPLACED WITH A NEW RE-ENGINEERED PART”
— Owner report, NHTSA ODI #10811684

Read all complaints on NHTSA →

Seat belt retractor failure preventing buckling

SEAT BELTS

3 NHTSA complaints · 2014-06 → 2024-12

“The driver's seat belt is locked and the retractor is not working without any reason”
— Owner report, NHTSA ODI #11629538
“SEAT BELTS WILL NOT EXTEND. WHEN TRYING TO BUCKLE SEAT BELT, THE BELT RETRACTOR LOCKS AS YOU TRY TO EXTEND, PREVENTING YOU FROM BUCKLING YOUR SEAT-BELT”
— Owner report, NHTSA ODI #11132292
“SEAT BELT ON THE DRIVER SIDE WILL NOT PULL OUT TO LATCH, I HAVE TAKEN IT TO THE DEALER FIVE TIMES OVER THE COARSE OF 2.5 YEARS AND THEY SAY "THIS IS NORMAL FOR THIS VEHICLE", MY WIFE HAD TO DRIVE THE CAR WITH NO SEAT BELT”
— Owner report, NHTSA ODI #10598246

Read all complaints on NHTSA →

Engine stalling and loss of power from fuel pump failure

ENGINE

15 NHTSA complaints · 2012-08 → 2026-04

“Vehicle stalled without warning, and I was advised by a mechanic that the fuel pump control unit was reporting a fault through the onboard diagnostics port and the check engine light on the dashboard”
— Owner report, NHTSA ODI #11634404
“VEHICLE LOSES POWER AFTER A FEW HOURS OF DRIVING. THIS PROBLEM DOES NOT SHOW ANY ERROR MESSAGE ON THE DASHBOARD, AND THE DEALER CANNOT FIX THIS PROBLEM AFTER MULTIPLE ATTEMPTS”
— Owner report, NHTSA ODI #10479969
“THE VEHICLE STALLED AFTER THE FIRST WEEK OF PICKING UP A BRAND NEW VEHICLE AT A TRAFFIC LIGHT. DEALER REPLACED HIGH PRESSURE FUEL PUMP, BUT THE VEHICLE CONTINUED TO STALL ON MANY DIFFERENT SUBSEQUENT OCCASIONS RANDOMLY”
— Owner report, NHTSA ODI #10510348

Read all complaints on NHTSA →

Water intrusion in spare tire wheel well disabling fuel pump

FUEL/PROPULSION SYSTEM

4 NHTSA complaints · 2023-05 → 2024-01

“While driving, vehicle stalled. Mechanic found water in spare wheel Well. And fuel module and fuel pump shorted out”
— Owner report, NHTSA ODI #11555567
“Due to water in the spare wheel well, (Recall ID:22V955) our fuel module and fuel pump went out. While driving in traffic on I-5 our car stalled then stopped which put us at risk of a crash”
— Owner report, NHTSA ODI #11521457
“The contact owns a 2012 Mercedes-Benz ML350. The contact stated that while driving at an undisclosed speed, the vehicle stalled and lost forward propulsion”
— Owner report, NHTSA ODI #11567440

Read all complaints on NHTSA →

Turn signal and blind spot assist failure

ELECTRICAL SYSTEM, LANE DEPARTURE

11 NHTSA complaints · 2017-11 → 2024-07

“Steering column module is intermittently not working as intended, therefore the blinkers will sometimes not work causing it to be a safety concern if I can not signal where I am going”
— Owner report, NHTSA ODI #11602716
“After traveling in the car for 5-15 minutes, and sooner if connected to cell phone via bluetooth, the indicators stop working. This leads to deactivation of the blind spot assist as well”
— Owner report, NHTSA ODI #11478166
“THE TURN SIGNALS STOP WORKING AFTER DRIVING THE CAR FOR A FEW MINUTES. TO GET THEM TO WORK AGAIN REQUIRES STOPPING THE CAR, SHUTTING OFF THE ENGINE AND RESTARTING IT WHICH IN TURN RESETS THE COMPUTER”
— Owner report, NHTSA ODI #11402827

Read all complaints on NHTSA →

Power steering malfunction and steering lockup

STEERING

3 NHTSA complaints · 2013-07 → 2016-08

“TL* THE CONTACT OWNS A 2012 MERCEDES-BENZ ML350. WHILE DRIVING APPROXIMATELY 70 MPH, THE STEERING WHEEL SEIZED AND THE POWER STEERING WARNING INDICATOR ILLUMINATED”
— Owner report, NHTSA ODI #10902940
“WHILE TRAVELING AT 55MPH THE STEERING SUDDENLY FELT VERY STIFF AND HARD TO MOVE. HAD TO APPLY BRAKES WHEN IT SEEMED I COULDN'T NEGOTIATE A CURVE IN THE ROAD”
— Owner report, NHTSA ODI #10542743
“AFTER 7 MILES OF DRIVING ON THE ROAD SUDDENLY SHOWING ERROR MESSAGE " POWER STEERING MALFUNCTION REFER TO OPERATOR'S MANUAL" AT THAT TIME STEERING WAS SUPER SUPER SUPER HARD TO TURN”
— Owner report, NHTSA ODI #10523508

Read all complaints on NHTSA →

Diesel fuel odor and leaks entering the passenger cabin

FUEL/PROPULSION SYSTEM

2 NHTSA complaints · 2018-04 → 2019-03

“TOOK OUR 2012 MERCEDES-BENZ ML350 BLUETEC TO THE DEALERSHIP NUMEROUS TIMES DUE TO AN OVERPOWERING FUEL SMELL AND BURNED PLASTIC IN THE CABIN OF THE VEHICLE”
— Owner report, NHTSA ODI #11185111
“AFTER BEING INTO AUTHORIZED MERCEDES BENZ DEALERSHIP ONLY FOR AN STRONG DIESEL FUEL SMELL AND OIL LEAK 3 TIMES IN LESS THAN 4 MONTHS ON OUR ML350 BLUETEC ENGINE FUEL SMELL IS STRONG ENOUGH THAT WE HAVE A SEVER HEADACHE”
— Owner report, NHTSA ODI #11090864

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 17, 2026. Investigation data refreshed Sep 17, 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)

7 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 2012 Mercedes Benz Ml 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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