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Power Train, electrical System, engine
11/20/2025
The Power Electronics Control Unit (ECM), Part No. A453-900-72-11, and the DC-to-DC converter have both failed, rendering this all-electric vehicle completely inoperable. There is no backup propulsion system. The DC-to-DC converter powers safety-critical systems including lighting, turn signals, and hazard flashers — its failure could cause loss of safety-critical functions while driving. Total repair estimate is $20,560.43. The manufacturer Mercedes-Benz USA denied warranty coverage using a Canadian warranty document for the wrong vehicle model. MBUSA has shut down the Smart warranty portal at the dealer level and their website returns no warranty data for Smart vehicles despite active warranty obligations. Smart exited the US market and MBUSA appears to have abandoned warranty support while warranties remain active.
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Steering, suspension, wheels
07/04/2019
What component or system failed or malfunctioned, and is it available for inspection upon request? Driver Side front wheel / maybe steering rack / etc. makes loud grinding / rubbing sound when making turn only when the weather's hot and humid and when the car has been running for about 20 min How was your safety or the safety of others put at risk? Noise / rubbing / grinding sound comes from the driver side front wheels or Has the problem been reproduced or confirmed by a dealer or independent service center? Yes, Service center reproduced the sound and went two levels deep to try and ascertain the origin but to no avail. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? YES Has been inspected multiple times by different mechanics costing hundreds of dollars with still no diagnostic or remedy. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear...
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Electrical System
06/28/2023
The car won't charge over 20% due probably a faulty manufacturer part of N83 high voltage control box. This could cause very serious electrical/battery issues if the high voltage box is faulty.
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Seat Belts
09/01/2018
SEAT BELTS DO NOT RETRACT. THERE WERE COUPLE OF TIMES WHILE IN TRANSIT ON CITY ROAD, I HAD TO APPLY BRAKE SUDDENLY AND SEAT BELT FAIL TO ENGAGE TO HOLD THE PASSENGER BACK . ALL THE TIME , BOTH SEAT BELTS DO NOT RETRACT TO THEIR HOME POSITION WHEN NOT IN USE AND CAR IS STOPPED AND PARKED, THIS CAUSED DENTS TO THE CAR'S BODY AND FRAME AROUND THE DOOR WHEN WE CLOSE THE DOORS. I REPORTED TO THE LOCAL MERCEDES DEALER SEPTEMBER 2018. IN DECEMBER, THEY COULD ONLY REPLACE THE DRIVER SIDE SEAT BELT. THE PASSENGER SIDE'S BELT HAS BEEN CLAIMED TO BE BACKED ORDER TILL NOW. I HAVE CALLED NUMEROUS TIMES TO FOLLOW UP FOR THE REPAIR AND I AM STILL WAITING FOR OVER 6 MONTHS FOR THIS FAULTY SEAT BELT TO BE REPAIRED. I DON'T FEEL SAFE TO DRIVE MY CAR. I LEASE THIS NEW CAR SINCE OCTOBER 2017 AND THE SAFETY ISSUE HAPPENED ONLY WITHIN A YEAR.
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Electrical System, exterior Lighting, visibility/wiper
06/21/2018
TL* THE CONTACT OWNS A 2017 SMART FOR TWO. WHILE THE VEHICLE WAS IN REVERSE, THE CONTACT HEARD AN ABNORMAL NOISE COMING FROM THE REAR OF THE VEHICLE. THE REAR EXTERIOR LIGHTING AND REAR WIPER WARNING INDICATOR ILLUMINATED. THE VEHICLE WAS TAKEN TO GARAGE ISLA VERDE LLC (LOCATED AT AVE, BALDORIOTY DE CASTRO KM 10.3, PR 00979, (787) 620-1313), BUT WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 2,334. **TR CONSUMER COMMENT IN SPANISH. UPDATED 10/30/18*JB