RoadVitals

2009 Mercedes-Benz ML550 Problems

Owner-reported complaints filed with NHTSA, grouped by component

Data refreshed

Owner complaintsComplaints are reports submitted to NHTSA by owners and drivers. NHTSA does not verify most reports before publishing them, and a complaint does not establish that a defect exists. Volume is influenced by how many of a vehicle were sold, how long it has been on the road, and how much attention an issue has received.
4
Latest Apr 5, 2024
Components namedHow many of our component categories appear on at least one report for this model year. One report can name several.
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Crash or fire reportedComplaints whose submitter recorded that a crash or a fire occurred. These are the reporter's own answers on the NHTSA form, not verified findings.
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What this page shows

Everything below is an owner-reported complaint submitted to NHTSA about the 2009 Mercedes-Benz ML550, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.

Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.

Reports by component

Ranked by how many owner reports name each component category

  • Brakes250.0%
  • Airbags125.0%
  • Tires & wheels125.0%

Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.

Each component in detail

What the reports in each category say, in the owners' own words

Brakes

Reports naming service brakes, the antilock braking system, brake hoses, master cylinders or the parking brake.

2
reports

From owner reports, verbatim

The contact owns a 2009 Mercedes-Benz ML550. The contact stated while driving at various speeds and depressing the brake pedal, the brake pedal went to the floorboard and seized. Additionally, the vehicle failed to respond. There was no warning light illuminated. The contact continuously depressed the brake pedal until the brake pedal raised off the floorboard. The contact received notification of NHTSA Campaign Number: 22V315000 (Service Brakes, Hydraulic) and the vehicle was taken to the dealer, where the recall repair was performed; however, the brake booster was not replaced. The contact stated that the failure had been recurring while driving. The manufacturer was notified of the failure and assisted in towing the vehicle to the dealer. The dealer informed the contact that a fee would be charged for a diagnostic test and repair. The vehicle was not diagnosed or repaired. The failure mileage was unknown.

NHTSA ID 11581410 · filed Apr 5, 2024

In mid February/early March the brakes failed while the vehicle was moving in a parking lot. After exiting the vehicle with the emergency brake on, I found a pool of brake fluid under the car. After towing it home, I had to make the decision to leave the car sitting as I did not have the financial resources to take it to an authorized mechanic as I had lost my job in January. In May learned of the recall and called the number, only to be told that I have to wait for a letter in the mail and to do nothing until I receive a letter. After roughly 2 months we received that letter, and the only instructions were to set up a service appointment, which I did at their earliest date available, which was 20 days later. As the car sat undriveable for months on end the lines clearly corroded further and further, and the battery was also damaged by sitting uncharted for that period of time. So when they received the car, they would not repair the car until the battery was replaced, which they would not cover even though they are clearly the cause of that as well. Then, four days after receiving the car, they have decided that the brake failure was caused by excessive corrosion (which was not there until the car sat for as many months as it did) and they would not cover the repair nor finish the safety recall, and as I type this, have not confirmed if they are even going to cover the tow back to my home(over an hour away) so that I can perform the brake line repairs myself. I find all of this extremely hard to believe as we purchased the car less than two years before the incident and the steel lines were inspected before we picked it up. I understand corrosion can cause failure like this in extreme situations over long periods of time, but I do not believe that it was not caused by their neglect. I am desperate for help at this moment.

NHTSA ID 11475982 · filed Jul 26, 2022

Too few reports in this category for a page of its own — they appear in the full complaint list.

Airbags

Reports naming the air-bag system — deployment behaviour, inflators, sensors and warning lights.

1
report

From owner reports, verbatim

TL* TAKATA RECALL. THE CONTACT OWNS A 2009 MERCEDES-BENZ ML550. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 16V081000 (AIR BAGS); HOWEVER, THE PARTS TO DO THE REPAIR WAS UNAVAILABLE. THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR. THE MANUFACTURER WAS NOTIFIED OF THE ISSUE. THE CONTACT HAD NOT EXPERIENCED A FAILURE. PARTS DISTRIBUTION DISCONNECT.

NHTSA ID 10970543 · filed Apr 4, 2017

Too few reports in this category for a page of its own — they appear in the full complaint list.

Tires & wheels

Reports naming tires, wheels, hubs, or the tire-pressure monitoring system.

1
report

From owner reports, verbatim

TIRES ARE NEW 3500 MILES. NORMAL DRIVING AT 40 MPH LOUD NOISE COMING FROM TIRE AND BLEW OUT. THE STEEL BELT WAS FAULTY. TWO DAYS LATER LOUD NOISE COMING FROM ANOTHER NEW TIRE TIRE OUT OF ROUND DUE TO STEEL BELT FAILURE. NO ROAD HAZARD SO TIRE DEALER SAID EVEN THOUGH THEY ARE NEW IT WILL BE ANOTHER 880.00. THE TIRES CLEARLY ARE FAULTY AND WILL CAUSE AN ACCIDENT. DUNLOP 255/50R19 ALL 4 BOUGHT AND INSTALLED 2 FAILED 2 DAYS APART. VERY DANGEROUS BLOWOUT NO INJURIES. THESE TIRES ARE NOT RIGHT AND SHOULD BE COVERED UNDER A RECALL. I HAVE BEEN IN CAR BUSINESS FOR 45 YEARS AND KNOW WHAT THIS IS. NO RESULTS AND NEED CLOSURE QUICKLY !!

NHTSA ID 10935964 · filed Dec 17, 2016

Too few reports in this category for a page of its own — they appear in the full complaint list.

Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.

Elsewhere on this vehicle

Data sources

Data on this page last refreshed .