NHTSA owner reports · September 18, 2026 snapshot.
Power Train complaints
27 reportsClear category filter98,000 miles · Feb 17, 2018
Power Train
ON FIVE OCCASIONS, SUDDENLY AND WITHOUT WARNING, MY SMART CAR SHIFTED IN TO NEUTRAL BY ITSELF WHILE DRIVING ON THE HIGHWAY. WHILE THE SHIFTER WAS IN DRIVE, THE INDICATOR BELOW THE SPEEDOMETER WAS BLANK, AND THE CAR WOULD NOT MOVE. THIS PROBLEM ALWAYS SEEMS TO OCCUR AFTER DRIVING AT HIGHER SPEEDS. I TOOK THE CAR INTO THE DEALE…
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ON FIVE OCCASIONS, SUDDENLY AND WITHOUT WARNING, MY SMART CAR SHIFTED IN TO NEUTRAL BY ITSELF WHILE DRIVING ON THE HIGHWAY. WHILE THE SHIFTER WAS IN DRIVE, THE INDICATOR BELOW THE SPEEDOMETER WAS BLANK, AND THE CAR WOULD NOT MOVE. THIS PROBLEM ALWAYS SEEMS TO OCCUR AFTER DRIVING AT HIGHER SPEEDS. I TOOK THE CAR INTO THE DEALERSHIP AND THEY CLAIMED TO HAVE REPAIRED THE PROBLEM WITH A COMPUTER REPROGRAM. AFTER THE "REPAIR" THE CAR HAD THE SAME PROBLEM. THIS IS A VERY SERIOUS SAFETY ISSUE BECAUSE THE CAR WITHOUT WARNING COMPLETELY LOSES POWER AND ON MORE THAN ONE OCCASION I HAVE ALMOST BEEN REAR ENDED.
NHTSA ODI #11073368
23,000 miles · Sep 14, 2017
Power Train
FIRST START OF THE DAY IT WILL NOT SHIFT INTO R OR D. IT WILL SHOW P AND N WHEN YOU SHIFT BUT IT WILL NOT GO INTO GEAR FOR REVERSE OR DRIVE. YOU HAVE TO RESTART THE CAR SEVERAL TIMES TO GET IT TO SHIFT. JUST SPOKE WITH SMART CAR ON THE PHONE AND THEY DENY KNOWING ANYTHING ABOUT IT. HOWEVER SEARCHING THE WEB YOU WILL SEE ITS VER…
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FIRST START OF THE DAY IT WILL NOT SHIFT INTO R OR D. IT WILL SHOW P AND N WHEN YOU SHIFT BUT IT WILL NOT GO INTO GEAR FOR REVERSE OR DRIVE. YOU HAVE TO RESTART THE CAR SEVERAL TIMES TO GET IT TO SHIFT. JUST SPOKE WITH SMART CAR ON THE PHONE AND THEY DENY KNOWING ANYTHING ABOUT IT. HOWEVER SEARCHING THE WEB YOU WILL SEE ITS VERY COMMON. ITS A FACTORY DEFECT THAT SMART CAR IS DENYING.
NHTSA ODI #11023460
118,000 miles · Dec 26, 2016
Power TrainVehicle Speed Control
WITHIN THE SPACE OF THREE MONTHS, IN THE MIDDLE OF DRIVING MY SMARTCAR, MY DASH DISPLAY HAS GONE FROM SHOWING D (FOR DRIVE) TO N AND THEN FLASHING THREE VERTICAL BARS. I HAVE LOST ALL CONTROL OF DRIVING THE CAR AND LUCKILY THERE WAS SPACE ON THE SIDE OF THE ROAD TO COAST TO A STOP. WHEN TRYING TO TURN THE CAR BACK ON, THE THREE …
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WITHIN THE SPACE OF THREE MONTHS, IN THE MIDDLE OF DRIVING MY SMARTCAR, MY DASH DISPLAY HAS GONE FROM SHOWING D (FOR DRIVE) TO N AND THEN FLASHING THREE VERTICAL BARS. I HAVE LOST ALL CONTROL OF DRIVING THE CAR AND LUCKILY THERE WAS SPACE ON THE SIDE OF THE ROAD TO COAST TO A STOP. WHEN TRYING TO TURN THE CAR BACK ON, THE THREE BARS REMAIN. THERE IS A WAY THROUGH THE SHIFTER TO RESTART THE CAR OR AT LEAST GETTING IT INTO NEUTRAL. A SERIES OF PUMPING THE BRAKE, TURNING THE START KEY AND TRYING TO MOVE THE SHIFTER BACK AND FORTH THROUGH GEARS. EVENTUALLY, THE CAR WILL START. UNFORTUNATELY, THE THREE BARS OF DEATH (AS NICKNAMED ON THE SMART CAR FORUMS) CAN HAPPEN FOR ANY NUMEROUS TYPES OF FAULTS SUCH AS WEAK BATTERY TO FAULTY COMMUNICATION WITH THE TRANSMISSION, TO HEATER/AIR CONDITIONING OPERATING UNIT IS DEFECTIVE. THE LIST IS LONG. THE PROBLEM IS MY CAR HAS COMPLETELY STOPPED WORKING IN THE MIDDLE OF THE ROAD WITHOUT WARNING AND THIS COULD BE VERY DANGEROUS. *TR
NHTSA ODI #10937491
63,000 miles · Oct 7, 2016
Power Train
WHEN CAR IS STATIONARY AND I START IT AND PUT IT INTO REVERSE THE CAR WOULD NOT MOVE. THE GEAR INDICATOR INSTEAD OF SHOWING "R" SHOWS BLANK. I HAVE TO TURN OFF ENGINE AND TRY AGAIN. I SUCCEED IN ABOUT 3 TRIES. THERE ARE TIMES THAT WHEN I SHIFT INTO REVERSE THE GEAR INDICATOR DISPLAYS "N". THIS EPISODE HAPPENS ABOUT TWO TIMES A W…
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WHEN CAR IS STATIONARY AND I START IT AND PUT IT INTO REVERSE THE CAR WOULD NOT MOVE. THE GEAR INDICATOR INSTEAD OF SHOWING "R" SHOWS BLANK. I HAVE TO TURN OFF ENGINE AND TRY AGAIN. I SUCCEED IN ABOUT 3 TRIES. THERE ARE TIMES THAT WHEN I SHIFT INTO REVERSE THE GEAR INDICATOR DISPLAYS "N". THIS EPISODE HAPPENS ABOUT TWO TIMES A WEEK. MY OBSERVATION IS THAT IT DOES NOT DEPEND ON THE TIME OF DAY - WHETHER MORNING, AFTERNOON, OR EVENING; OR, COLD OR HOT DAY. IT SEEMS TO OCCUR AT RANDOM.
NHTSA ODI #10914472
25,000 miles · Jun 21, 2016
Power TrainSeat Belts
SEAT BELTS FOR BOTH DRIVER AND PASSENGER SIDES BECAME TWISTED WITHIN THE FIRST COUPLE OF YEARS OF OWNERSHIP. DESPITE ATTEMPTS BY SERVICE TECHNICIANS TO UNTWIST AND REPAIR THE MECHANISM THE SEAT BELTS REMAIN TWISTED. SEAT BELT LATCH ON DRIVER'S SIDE FINALLY FAILED AT ABOUT 25,000 MILES. BOTH SEAT BELTS HAD TO BE COMPLETELY REPLAC…
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SEAT BELTS FOR BOTH DRIVER AND PASSENGER SIDES BECAME TWISTED WITHIN THE FIRST COUPLE OF YEARS OF OWNERSHIP. DESPITE ATTEMPTS BY SERVICE TECHNICIANS TO UNTWIST AND REPAIR THE MECHANISM THE SEAT BELTS REMAIN TWISTED. SEAT BELT LATCH ON DRIVER'S SIDE FINALLY FAILED AT ABOUT 25,000 MILES. BOTH SEAT BELTS HAD TO BE COMPLETELY REPLACED AT OUR EXPENSE. ALSO, THE CAR DOESN'T ALWAYS SHIFT FROM PARK TO REVERSE PROPERLY. IT SOMETIMES TAKES SEVERAL ATTEMPTS TO GET THE TRANSMISSION TO ENGAGE.
NHTSA ODI #10875516
47,000 miles · May 20, 2016
Power Train
VEHICLE DOESN'T ALWAYS SHIFT INTO REVERSE FROM PARK.SOMETIMES WILL NOT GO INTO DRIVE FROM PARK MANY PEOPLE WITH SAME PROBLEM ONLINE. PLEASE PLEASE HELP US GET THE MANUFACTURER THE FIX THIS. THIS IS NOT NORMAL WEAR AND TEAR.
NHTSA ODI #10870101
28,000 miles · Apr 19, 2016
Power Train
I ALSO HAVE THE PROBLEM WITH THE TRANSMISSION. THE TRANSMISSION WILL NOT GO INTO REVERSE OR DRIVE AFTER ENGINE STARTS. IT HAPPENS ABOUT 2 TO 3 TIMES A YEAR. IT CAN HAPPEN AFTER AN OVERNIGHT STOP OR JUST A FEW MINUTES. IT ALWAYS WORKS AFTER A FEW MINUTES HOWEVER, A COUPLE OF TIMES THE NON ENGAGING TRANSMISSION ALLOWED THE CAR TO…
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I ALSO HAVE THE PROBLEM WITH THE TRANSMISSION. THE TRANSMISSION WILL NOT GO INTO REVERSE OR DRIVE AFTER ENGINE STARTS. IT HAPPENS ABOUT 2 TO 3 TIMES A YEAR. IT CAN HAPPEN AFTER AN OVERNIGHT STOP OR JUST A FEW MINUTES. IT ALWAYS WORKS AFTER A FEW MINUTES HOWEVER, A COUPLE OF TIMES THE NON ENGAGING TRANSMISSION ALLOWED THE CAR TO ROLL INTO A VULNERABLE POSITION IN THE STREET. I FELT LUCKY THERE WAS NO TRAFFIC.
NHTSA ODI #10860443
21,000 miles · Dec 4, 2015
Power Train
WHILE DRIVING THE CAR, THE ENGINE WILL REV AND THEN THERE IS ONLY NEUTRAL SHOWING. I HAVE NO REVERSE OR DRIVE. THANK GOODNESS WHEN THIS HAPPENS I HAVE HAD A PLACE TO PULL OFF THE ROAD. I TURN THE CAR OFF AND SIT FOR A FEW MINUTES, TURN IT BACK ON AND HAVE ALL THE GEARS. I HAVE TRIED DRIVING IN THE "MANUAL" POSITION BUT IT ST…
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WHILE DRIVING THE CAR, THE ENGINE WILL REV AND THEN THERE IS ONLY NEUTRAL SHOWING. I HAVE NO REVERSE OR DRIVE. THANK GOODNESS WHEN THIS HAPPENS I HAVE HAD A PLACE TO PULL OFF THE ROAD. I TURN THE CAR OFF AND SIT FOR A FEW MINUTES, TURN IT BACK ON AND HAVE ALL THE GEARS. I HAVE TRIED DRIVING IN THE "MANUAL" POSITION BUT IT STILL HAPPENS. LATELY IT IS MORE AND MORE FREQUENT. ONE OF THESE DAYS THIS CAR WILL GET ME SMUSHED. SMART NEEDS TO DO A MAJOR RECALL ON THIS! I AM ONLY THE SECOND OWNER OF THIS CAR AND GOT IT WITH ONLY 18,000 MILES ON IT. I NOW HAVE 35,025 MILES ON IT. TOOK IT TO A MECHANIC AND GIVES A PO803 CODE, WHICH STATES A CLUTCH SENSOR. SMART CARS CODE SAYS IT NEEDS A NEW CLUTCH! WTH!?? AND IF IT NEEDS A NEW CLUTCH THEN WHY DOES THIS ONLY OCCURR IN THE COLDER WEATHER AND NOT THE SUMMER!!??!! I AM SO PISSED! SMART CAR TAKE RESPONSIBILITY FOR YOUR SCREWUP IN THE DESIGN OF THIS CAR! THIS HAS HAPPENED SO MANY TIMES!!!
NHTSA ODI #10808393
38,000 miles · Oct 19, 2015
Electrical SystemPower Train
THE VEHICLE FAILS INTERMITTENTLY TO SHIFT FROM BRAKE TO REVERSE OR FROM REVERSE TO DRIVE. WHEN THE FAILURE OCCURS, ALL THAT IS SEEN ON THE FRONT DASHBOARD IS A BLANK SCREEN AND THE CAR ALERT SYSTEMS LETS OUT A CONTINUOUS BEEPING DENOTING THE FAILURE OF THE SHIFT. IT SOMETIMES REQUIRES IMMEDIATE TURNING OFF OF THE ENGINE AND REST…
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THE VEHICLE FAILS INTERMITTENTLY TO SHIFT FROM BRAKE TO REVERSE OR FROM REVERSE TO DRIVE. WHEN THE FAILURE OCCURS, ALL THAT IS SEEN ON THE FRONT DASHBOARD IS A BLANK SCREEN AND THE CAR ALERT SYSTEMS LETS OUT A CONTINUOUS BEEPING DENOTING THE FAILURE OF THE SHIFT. IT SOMETIMES REQUIRES IMMEDIATE TURNING OFF OF THE ENGINE AND RESTARTING IN ORDER TO GET TO THE DESIRED GEAR. SELDOM THAT DOES NOT WORK, AND TURNING OFF AND WAITING 10 MINUTES SEEMS TO ALLOW GEAR SHIFTS. THIS IS DANGEROUS ESPECIALLY IN THE REVERSE TO DRIVE FAILURE AS WHEN COMING OUT OF A DRIVEWAY ON A BUSY ROAD, IT MAY CAUSE AN ACCIDENT. THIS HAS OCCURRED AFTER WARRANTY AND I WAS TOLD THERE IS A MERCEDES BENZ SOFTWARE UPGRADE MEANT TO SOLVE IT. BUT THIS IS A CHARGED SERVICE. AS A SAFETY ISSUE, I IMPLORE THAT THIS SHOULD NOT BE A CHARGED BUT REQUIRED SAFETY RECALL. UPON VIEWING THE COMPLAINTS IT SEEMS A FEW OTHER SUFFER THE SAME DEGREE OF FAILURES. AS THE CAR IS A NICHE BRAND, THE CONSUMER BASE IS SMALLER AND YOU DO NOT HAVE AS LARGE A COMPLAINT POOL AS A HONDA ACCORD, WHICH IS FAIRLY POPULAR AND HAS A LARGE CONSUMER BASE. I HUMBLY REQUEST THE NHSTA MAKE DAIMLER AG AND MERCEDES BENZ USA RESPONSIBLE TO REPAIR THIS AND HAVE EVERY SMART ON THE ROAD'S TRANSMISSION SOFTWARE UPGRADED FREE OF COST.
NHTSA ODI #10783535
15,000 miles · Apr 14, 2015
Fuel/propulsion SystemPower TrainTires
WHERE DO I BEGIN? AFTER ABOUT A YEAR OF OWNING MY SMART CAR, I WAS DRIVING ON THE HIGHWAY DOING ABOUT 70 MPH WHEN SUDDENLY I FEEL MY CAR PULL TO THE RIGHT AND START SHAKING. I PULL SAFELY TO THE SHOULDER TO FIND THE VALVE STEM FOR MY TIRE HAD DETACHED AND MY TIRE WAS NOW FLAT. NOT HAVING A SPARE, I HAD TO CALL A TOW TRUCK. THE S…
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WHERE DO I BEGIN? AFTER ABOUT A YEAR OF OWNING MY SMART CAR, I WAS DRIVING ON THE HIGHWAY DOING ABOUT 70 MPH WHEN SUDDENLY I FEEL MY CAR PULL TO THE RIGHT AND START SHAKING. I PULL SAFELY TO THE SHOULDER TO FIND THE VALVE STEM FOR MY TIRE HAD DETACHED AND MY TIRE WAS NOW FLAT. NOT HAVING A SPARE, I HAD TO CALL A TOW TRUCK. THE SAME ISSUE HAPPENED TO THE REMAINING 3 TIRES IN THE FOLLOWING MONTHS TO A YEAR. WHILE DRIVING THE VALVE STEM WOULD DETACH AND ALL AIR DEPLETING FROM THE TIRES. I CALLED THE SMART DEALER TO BE TOLD THIS WAS IMPOSSIBLE BECAUSE THE VALVE STEMS WERE BOLTED TO THE RIM, WELL CLEARLY NOT SINCE IT HAD HAPPENED TO EVERY TIRE.I HAVE HAD MULTIPLE CYLINDER MISFIRES WITH THIS CAR. I HAVE HAD TO REPLACE THE FUEL PUMP. I HAVE HAD TO REPLACE THE ALKALOID TIMING SENSOR. I HAVE HAD TO REPLACE THE BLOWER MOTOR FOR MY HEAT AND A/C. MY HEADLIGHTS GO OUT EVERY OTHER MONTH. CAR HAS STOPPED BECAUSE A WIRE CAME LOOSE IN THE BATTERY. WHEN I TURN RIGHT OR GO ON AN ONRAMP, I HEAR THIS AWFUL CLUNKING SOUND AS IF SOMETHING IS HITTING A TIN. WHEN I GO OVER BUMPS MY CAR MAKES A SQUEAKING SOUND. WHEN GOING FROM PARK INTO REVERSE...CAR WILL NOT GO INTO GEAR. MY CAR WILL READ P AND N. I HAVE TO TURN MY CAR OFF/ON MULTIPLE TIMES AS WELL AS MESS WITH MY SHIFTER FOR ABOUT 5 MINUTES BEFORE I CAN GO ANYWHERE. THE CHERRY ON TOP HAPPENED TODAY ON MY WAY HOME TO AKRON FROM COLUMBUS. AS I AM DRIVING ON THE HIGHWAY WITH A SEMI TRUCK BEHIND ME MY CAR STARTED LOSING SPEED, EVEN WHEN PUSHING THE GAS. I ALMOST WAS STRUCK BY THE SEMI DUE TO THE SUDDEN DECREASE OF SPEED BUT THANKFULLY WAS ABLE TO PULL OFF THE HIGHWAY. ONCE STOPPED, ALL LIGHTS CAME ON AND CAR SHUT OFF. PUT MY CAR IN PARK TO TRY TO START MY CAR AGAIN, NOTHING. MY ENGINE WILL REV BUT THE ENGINE WILL NOT TURN OVER. WILL FIND OUT WHAT THAT IS TOMORROW HOPEFULLY. CAR WAS BRAND NEW WHEN PURCHASED AND BOUGHT THE CAR 5YRS AND 1 MONTH AGO. *TR
NHTSA ODI #10705509
NHTSA investigations
2EA17003 · Engine Compartment Fire
Opened Sep 1, 2017 · Closed Aug 21, 2018
Status: closed (inferred from source dates) · Engine
On April 30, 2018, Mercedes-Benz USA, LLC, (Mercedes-Benz) submitted a Defect Information Report (DIR) to NHTSA regarding a defect that could result in a vehicle fire starting from the engine compartment in 42,781 model year (MY) 2008 and 2009 Smart Fortwo cabrio and coupe vehicles (451 platform).According to Mercedes-Benz?s DIR, ?the rear insulation mat within the engine compartment might deform, deteriorate, loosen and over time, subsequently be able to contact hot components of the exhaust system.This could lead to an ignition of the insulation mat and possible fire in the engine compartment.?The US-specification exhaust system has an external catalytic converter packaged close to the insulation mat, where temperatures in the vicinity of the insulation mat reach high values.Over time, these temperatures can lead to a change in the insulation mat's material characteristics and ultimately allow the material to deform. Depending on the magnitude and the specific location of the deformation, the insulation mat could contact hot components of the exhaust system and ignite.Mercedes-Benz will replace the rear insulation mat on the affected vehicles with the improved mat first implemented in the United States in MY 2010 vehicles.ODI?s analysis of fire incident field data reported to NHTSA and Mercedes-Benz show an increasing trend of non-crash fires in the subject vehicles that begins after 4 years of service and accelerates after 7 years of service.The analysis shows that this trend is driven by fires occurring in the engine compartment.Forensic investigations of fires occurring in the past year identified the insulation mat as a likely or possible cause of most of the fires originating in the engine compartment.This investigation is closed based on Mercedes-Benz insulation mat recall.For more information about field data trends and fire investigations, see the closing resume in the document file for this investigation.
PE16016 · Engine Compartment Fire
Opened Dec 16, 2016 · Closed Nov 20, 2017
Status: closed (inferred from source dates) · Engine
On December 16, 2016, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE16-016 to investigate eight complaints alleging incidents of engine compartment fire while driving or shortly after engine shutdown in model year (MY) 2008 through 2009 Smart Fortwo vehicles.The complaints appeared to indicate an increasing trend, with all eight fires occurring since January 2015.As part of PE16-016, ODI analyzed information related to incidents reported to the Office by consumers, analyzed field data and technical information submitted by Mercedes-Benz USA (Mercedes) in response to the PE16-016 information request letter, and analyzed non-crash vehicle fire claim data provided by the Highway Loss Data Institute (HLDI).To date, ODI's analysis of incidents reported by consumers and provided by Mercedes has identified 27 incidents of open flame fires originating in the engine compartments of the subject vehicles, 14 of which were reported to ODI by Vehicle Owner Questionnaires (VOQs) and 18 involving complaints or field reports to Mercedes (5 of the incidents were reported to both ODI and Mercedes).One incident reported to Mercedes includes an allegation of an injury from smoke inhalation.Nineteen (19) of the incidents occurred since January 2015.Mercedes has only investigated 2 of the 27 fire incidents, and the company was unable to identify a vehicle-based cause for either incident.To further assess incident rates and trends, ODI requested fire claim data for the subject vehicles and eight peer vehicles from the Highway Loss Data Institute (HLDI).HLDI collects insurance claim data from companies representing over 80 percent of the market for private passenger vehicle insurance in the United States.ODI?s analysis of the HLDI data, which covered the period from 2010 through late-2016, found that the MY 2008 Fortwo vehicles had a significantly higher claim frequency than its peers and, similar to ODI?s complaint trend, experienced a sharp increase in claims in 2015.This investigation has been upgraded to an Engineering Analysis (EA17-003) to continue to investigate the high frequency and increasing trend of non-crash engine compartment fire incidents in the subject vehicles.The VOQs associated with the opening of this investigation were:10676359, 10780222, 10790017, 10820891, 10872656, 10944676, 10916505, 10924311, 10924637, 10939504, 10945296, 10993895, 11011100, 11011565.