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What 22 owners told NHTSA about the 2018 Mercedes-benz GLS

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 (22)Crash / fire / injury (4)Brakes (4)Suspension (4)Electrical system (3)Body & structure (2)Engine (2)Transmission & drivetrain (2)Driver assistance (1)Electronic Stability Control (esc) (1)Fuel system (1)Lights (1)

1 of 22 complaints match · Electrical system · crash/fire/injury only · clear filters

Aug 7, 2018Electrical systemFire

TL* THE CONTACT OWNS A 2018 MERCEDES-BENZ GLS450. WHILE DRIVING 70 MPH, THE VEHICLE LOST POWER AND ALL THE WARNING INDICATORS ON THE INSTRUMENT PANEL ILLUMINATED. ALSO, WHEN THE BRAKE PEDAL WAS DEPRESSED, THE VEHICLE FAILED TO STOP. THE CONTACT STATED THAT THE VEHICLE FINALLY STOPPED UPON REACHING A HILL. THE VEHICLE FAILED TO RESTART AND WAS TOWED TO FLETCHER JONES MOTORCARS (3300 JAMBOREE RD, NEWPORT BEACH, CA 92660, (949) 718-3000). THE DEALER DIAGNOSED THAT THE WIRING HARNESS MELTED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND A COMPLAINT WAS OPENED. THE FAILURE MILEAGE WAS 200.

NHTSA ODI 11118382

Working with the data? Download all 22 complaints as CSV · fetched from NHTSA July 20, 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 2018 Mercedes-benz GLS verdict →