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What 11 owners told NHTSA about the 2015 Smart Coupe
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.
2 of 11 complaints match · Seat belts · clear filters
Jul 14, 2023Seat belts
The contact owns a 2015 Smart ForTwo. The contact stated while buckling the seat belt, he became aware that a metal cable through the eyelet bolted to the frame by the door jamb on the driver's side had started to fray. The contact stated that the vehicle was not driven frequently and felt that there could not be a wear and tear issue. The contact had not taken the vehicle to a local dealer. The vehicle had not been diagnosed and had not been repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 65,000.
NHTSA ODI 11532331
May 6, 2022Seat belts
The cable that connects the driver's seatbelt to the seatbelt tensioner (smart/Mercedes part number 4518600084) frayed. The car has less than 49,000 miles on it. Six of the seven strands of the cable frayed and broke, leaving just one strand connecting the driver's seatbelt to the car. I've attached photos of the tensioner as mounted in the car and removed from the car. The frayed cable is part of the tensioner (smart/Mercedes part number 4518600084). Mercedes of Portland said that the seatbelts are not covered under the warranty. I paid $252.23 to have the tensioner assembly replaced. I shudder to think what would have happened if I had been in an accident with this defective seatbelt.
NHTSA ODI 11463676
Working with the data? Download all 11 complaints as CSV · fetched from NHTSA July 28, 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 2015 Smart Coupe verdict →