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What 76 owners told NHTSA about the 2012 Mercedes-benz Gl-class

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (76)Crash / fire / injury (6)Airbags (40)Brakes (10)Suspension (7)Transmission & drivetrain (5)Engine (4)Electrical system (3)Fuel system (3)Electronic Stability Control (esc) (2)Seat belts (2)Body & structure (1)

Newest first · 76 complaints · page 4 of 4

Jul 10, 2013Brakes

HELLO, I WOULD LIKE TO NOTIFY A DEFECT ON A VEHICLE MERCEDES GL 500 MODEL SERIES X166 MADE IN 2012 IN U.S. PLANT BY MERCEDES COMPANY IN SEATTLE. WHILE DRIVING THERE WAS A FAULT IN THE BRAKING SYSTEM WITHOUT ANY WARNING LIGHTS. DURING THE BRAKING THE BRAKE WAS PUSHED TO THE FLOOR, BUT THE VEHICLE WAS NOT STOPPING. IN THE CASE IF THE VEHICLE WAS DRIVEN BY AN INEXPERIENCED DRIVER, IT IS MORE THAN CERTAIN THERE WOULD HAVE BEEN AN ACCIDENT. THE VEHICLE IS CURRENTLY LOCATED AT AN AUTHORIZED MERCEDES SERVICE IN TRENCIN (SLOVAKIA) AND HEADQUARTERS COMPANY DOES NOT APPEAR INTERESTED IN RESOLVING THIS SERIOUS SECURITY DEFECT. THEREFORE, THE VEHICLE WAS MANUFACTURED IN AMERICA AND MOSTLY IS SOLD IN THE U.S. MARKET; I GIVE THIS FACT TO YOUR ATTENTION WITH THE RECOMMENDATION TO INVESTIGATE THE TECHNICAL CONDITION OF THESE VEHICLES.

NHTSA ODI 10524428

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Working with the data? Download all 76 complaints as CSV · fetched from NHTSA July 26, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2012 Mercedes-benz Gl-class verdict →