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What 22 owners told NHTSA about the 2017 Mercedes-benz S-class Phev

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)Visibility & wipers (4)Airbags (3)Steering (3)Body & structure (2)Electrical system (2)Engine (2)Fuel system (2)Transmission & drivetrain (2)Lights (1)Seat belts (1)

1 of 22 complaints match · Seat belts · clear filters

Aug 23, 2022Seat belts

The contact owns a 2017 Mercedes-Benz S550. The contact stated the vehicle's front passenger seat belt failed to lock into the seat buckle. The failure occurred intermittently. The contact had taken the vehicle to a certified mechanic who stated the entire seat belt buckle needed to be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and informed the contact that the VIN was not included in NHTSA Campaign Number: 16V829000 (Seat Belts). The contact was advised to contact the NHTSA Hotline. The approximate failure mileage was 100,000

NHTSA ODI 11480834

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 2017 Mercedes-benz S-class Phev verdict →