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2014 Fiat 500

Owner reports · Recalls · Investigations

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There is not enough comparable history to draw a useful model-year comparison.

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Owner complaints by model year

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What owners reported most

All reported categories

Tap a category to read its complaints. One report may name several components.

When problems were reported

Mileage at the reported incident

104 reports with mileage · 20 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Power Train. Review the 67 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Electrical System. Review the 22 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Engine. Review the 19 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

9 crash reports7 fire reports6 injury reports

What owners actually said

124 reports
62,000 miles · Nov 17, 2015
Power Train

MY PREVIOUS COMPLAINT NHTSA # 10790955 WAS FILED PRIOR TO FIAT DIAGNOSING MY 2014 500L. I HAVE BEEN INFORMED THAT A REAR PLATE IN THE EURO CLUTCH TRANSMISSION FAILED CAUSING THE THE TRANSMISSION TO BLOW APART WHILE I WAS DRIVING THE VEHICLE.

NHTSA ODI #10794312

500 miles · Nov 15, 2015
Power TrainService BrakesCrash

FIRST INCIDENT WAS TWO WEEKS AFTER I PURCHASED THE FIAT 500L. THE BRAKES JAMMED AND I ENDED REAR ENDING ANOTHER VEHICLE. THE SECOND INCIDENT WAS SIX WEEKS AGO AFTER REPLACING THE FRONT BRAKES. I PURCHASED NEW ROTORS AND PADS;THAT EVENING THE BRAKES JAMMED AND CAUSED ME TO REAR END ANOTHER VEHICLE TWICE. MY FIAT 500L HAS EXPE…

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FIRST INCIDENT WAS TWO WEEKS AFTER I PURCHASED THE FIAT 500L. THE BRAKES JAMMED AND I ENDED REAR ENDING ANOTHER VEHICLE. THE SECOND INCIDENT WAS SIX WEEKS AGO AFTER REPLACING THE FRONT BRAKES. I PURCHASED NEW ROTORS AND PADS;THAT EVENING THE BRAKES JAMMED AND CAUSED ME TO REAR END ANOTHER VEHICLE TWICE. MY FIAT 500L HAS EXPERIENCED LOSING COMMUNICATION FROM THE COMPUTER TO THE TRANSMISSION, WHICH CAUSED MY VEHICLE TO STALL ON VARIOUS STREETS AND WHILE IN MOVING TRAFFIC. ON FRIDAY 13, 2015; MY FIAT 500L MADE A NOISE SO LOUD THAT IT SOUNDED LIKE IT WAS GOING TO BLOW UP. I IMMEDIATELY CHECKED THE ENGINE AND IT SOUNDED LIKE A LARGE HEAVY PIECE OF METAL WAS TRYING TO BREAK THROUGH THE ENGINE WALL. I TURNED THE VEHICLE OFF AND WAITED FOR 20 MIN. I STARTED THE VEHICLE AND THE NOISE WENT AWAY. AS I PULLED OFF THE VEHICLE STARTED MAKING A REAL LOUD NOISE AND SHUT OFF. THE VEHICLE HAS BEEN TOWED TO THE DEALER; HOWEVER FIAT IS ONLY CONCERNED THAT THEY DO NOT HAVE TO PAY FOR IT BECAUSE THE CAR IS OUT OF WARRANTY. MY ISSUE IS NOT THE MILEAGE; HOWEVER MY SAFETY. I AM NOT EASILY SCARED; HOWEVER I FELT LIKE MY FIAT 500L WAS GOING TO BLOW UP. THERE IS SOMETHING SERIOUSLY WRONG WITH THIS CAR, FCA NEEDS TO BUY BACK EVERY LAST ONE.

NHTSA ODI #10790455

19,000 miles · Nov 13, 2015
Power TrainVehicle Speed Control

TL* THE CONTACT OWNS A 2014 FIAT 500. WHILE DRIVING APPROXIMATELY 20 MPH, THE VEHICLE INDEPENDENTLY SLOWED DOWN TO 5 MPH WITHOUT WARNING. THE CONTACT DEPRESSED THE ACCELERATOR PEDAL TO THE FLOOR; HOWEVER, THE VEHICLE FAILED TO RESPOND. THE CONTACT REMOVED HER FOOT FROM THE ACCELERATOR PEDAL AND THEN DEPRESSED THE PEDAL TO THE FL…

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TL* THE CONTACT OWNS A 2014 FIAT 500. WHILE DRIVING APPROXIMATELY 20 MPH, THE VEHICLE INDEPENDENTLY SLOWED DOWN TO 5 MPH WITHOUT WARNING. THE CONTACT DEPRESSED THE ACCELERATOR PEDAL TO THE FLOOR; HOWEVER, THE VEHICLE FAILED TO RESPOND. THE CONTACT REMOVED HER FOOT FROM THE ACCELERATOR PEDAL AND THEN DEPRESSED THE PEDAL TO THE FLOOR. THE VEHICLE EVENTUALLY RESPONDED. THE FAILURE RECURRED ON SEVERAL OCCASIONS WHILE DRIVING AT LOWER SPEEDS, USUALLY IN COLD WEATHER. THE VEHICLE WAS TAKEN TO THE DEALER, BUT THE FAILURE WAS UNABLE TO BE DETERMINED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 19,000.

NHTSA ODI #10790266

26,000 miles · Oct 5, 2015
Power Train

MY WIFE WAS IN TRAFFIC AND HER VEHICLE WOULD NOT GO AND THE TRANSMISSION LIGHT CAME ON. SHE WAS STRANDED AND HAD TO CALL A WRECKER. THE DEALER TESTED THE VEHICLE AND FOUND NOTHING WRONG EXCEPT THAT IT WAS THE DOUBLE CLUTCH DESIGN FLAW AND STATED I NEEDED TO CALL FIAT AND PLACE A COMPLAINT. I DID SO AND FIAT SAID IT WAS A NATURAL…

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MY WIFE WAS IN TRAFFIC AND HER VEHICLE WOULD NOT GO AND THE TRANSMISSION LIGHT CAME ON. SHE WAS STRANDED AND HAD TO CALL A WRECKER. THE DEALER TESTED THE VEHICLE AND FOUND NOTHING WRONG EXCEPT THAT IT WAS THE DOUBLE CLUTCH DESIGN FLAW AND STATED I NEEDED TO CALL FIAT AND PLACE A COMPLAINT. I DID SO AND FIAT SAID IT WAS A NATURAL DESIGN CHARACTERISTIC AND SE NEEDS TO PUT THE CAR IN NEUTRAL WHEN IN STOP AND GO TRAFFIC. LETS FACE IT IF THE DEALER WOULD OF STATED THAT WHEN I PURCHASED THE VEHICLE I WOULD NOT HAVE PURCHASED IT. HOW STUPID DOES FIAT THINK WE AMERICANS ARE? I AM GOING FORWARD WITH A LAWSUIT. DO NOT EVER PURCHASE A FIAT PRODUCT !!!

NHTSA ODI #10779951

4,000 miles · Sep 23, 2015
Electrical System

AT LEAST 3 TIMES SINCE THE CAR WAS PURCHASED THE BATTERY DIED. THE FIRST COUPLE OF TIMES HAPPENED IN THE WINTER AND THE CAR WAS LEFT PARKED FOR 2-3 DAYS. IN FEBRUARY THEY ACTUALLY HAD TO REPLACE THE BATTERY. THE FIAT DEALERSHIP EXPLAINED AT THE TIME THAT IN THE COLD I SHOULDN'T LET THE CAR SIT FOR TOO LONG, BECAUSE ON THE FI…

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AT LEAST 3 TIMES SINCE THE CAR WAS PURCHASED THE BATTERY DIED. THE FIRST COUPLE OF TIMES HAPPENED IN THE WINTER AND THE CAR WAS LEFT PARKED FOR 2-3 DAYS. IN FEBRUARY THEY ACTUALLY HAD TO REPLACE THE BATTERY. THE FIAT DEALERSHIP EXPLAINED AT THE TIME THAT IN THE COLD I SHOULDN'T LET THE CAR SIT FOR TOO LONG, BECAUSE ON THE FIAT THE SYSTEMS USE THE BATTERY EVEN WHEN THE CAR IS NOT ON. I THOUGHT IT ODD, BUT FIGURED MAYBE THE COLD WEATHER COULD DO THIS. THIS SUMMER IT HAPPENED AGAIN. THE CAR WAS NOT USED IN 3 DAYS. IT DIDN'T START AND I HAD TO GET JUMPED. I BROUGHT IT TO THE DEALERSHIP AND THIS TIME THEY SAID THAT THEY FOUND OUT FROM FIAT THAT UNFORTUNATELY THE CAR IS DESIGNED IN SUCH A WAY THAT IT DRAINS ON THE BATTERY WHEN NOT IN USE AND THAT I CAN'T LET THE CAR SIT FOR MORE THEN 3 DAYS WITHOUT STARTING IT. HOW CRAZY IS THAT! THEY TOLD ME THAT IF I WENT AWAY AND HAD TO LEAVE THE CAR, THAT I HAD TO DISCONNECT THE CABLES FROM THE BATTERY. ARE THEY KIDDING? HOW CAN ANYONE DESIGN A CAR LIKE THAT. THEY JUST SHOOK THEIR HEADS AND SAID THERE IS NO FIX AND THAT I WOULD HAVE TO LIVE WITH THE CAR THIS WAY. HOW SAFE AM I IF I HAVE TO LEAVE THE CAR PARKED FOR SEVERAL DAYS AND THEN WHEN I HAVE TO USE IT, THE BATTERY IS DEAD. THERE NEEDS TO BE A FIX FOR THIS. THANKS

NHTSA ODI #10775406

9,980 miles · Sep 22, 2015
Power Train

THE CHECK ENGINE LIGHT CAME ON, THE CHECK TRANSMISSION LIGHT CAME ON, "CLUTCH OVER HEATING" DISPLAYED AND THE CAR STOPPED SHIFTING SMOOTHLY. THE DEALER "RESET" THE CLUTCH; AFTER DRIVING 1 MILE, IT HAPPENED AGAIN STOPPING IN TRAFFIC ON A VERY BUSY HIGHWAY DURING RUSH HOUR "WAIT WHILE THE CLUTCH COOLS DOWN" ALMOST CAUSING CRASHES…

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THE CHECK ENGINE LIGHT CAME ON, THE CHECK TRANSMISSION LIGHT CAME ON, "CLUTCH OVER HEATING" DISPLAYED AND THE CAR STOPPED SHIFTING SMOOTHLY. THE DEALER "RESET" THE CLUTCH; AFTER DRIVING 1 MILE, IT HAPPENED AGAIN STOPPING IN TRAFFIC ON A VERY BUSY HIGHWAY DURING RUSH HOUR "WAIT WHILE THE CLUTCH COOLS DOWN" ALMOST CAUSING CRASHES AS CARS VEERED TO GET AROUND MY STOPPED CAR. THE DEALER REPLACED THEN CLUTCH. IN LESS THAN 2 MILES, THE CAR HAD A SIMILAR PROBLEM, BUT WOULD ONLY AUTOMATICALLY GO INTO GEARS 2, 4, 6 AND WOULD SHIFT IN A JERKING MANNER AT BEST. REVERSE GEAR WAS NOT AVAILABLE AND ALARMS WOULD SOUND IF I PUT THE CAR IN NEUTRAL OR REVERSE ("THIS GEAR NOT AVAILABLE" WOULD DISPLAY.) THE DEALERSHIP IS REPLACING THE TRANSMISSION AND THE FLYWHEEL AND TOLD ME THIS MODEL HAD PROBLEMS WITH THE CLUTCH AND TRANSMISSION. THE CAR HAS NOW JUST GONE OVER 10,000 MILES. I DO NOT TRUST THIS CAR. I WANT AND NEED A REPLACEMENT. I DO NOT BELIEVE AFTER 3 ATTEMPTS - TWICE LEAVING ME STOPPED IN THE MIDDLE OF HEAVY TRAFFIC ON THE HIGHWAY - THE CAR IS ANYTHING OTHER THAN A LEMON.

NHTSA ODI #10767485

3,506 miles · Sep 10, 2015
EnginePower TrainUnknown Or Other

I WAS PULLING INTO TRAFFIC ON AN EXTREMELY BUSY ROAD. THERE IS ALWAYS HEAVY TRAFFIC ON THIS ROAD SO YOU MUST PULL OUT INTO TRAFFIC QUICKLY. WHEN DOING SO I PRESSED THE GAS PEDAL ALMOST TO THE FLOOR. THE CAR DID NOT SHIFT INTO ANY GEAR. IT WAS LIKE IT WENT INTO NEUTRAL. THE RPM'S REVED AND IT WOULD NOT MOVE. I WAS ALMOST HIT ON B…

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I WAS PULLING INTO TRAFFIC ON AN EXTREMELY BUSY ROAD. THERE IS ALWAYS HEAVY TRAFFIC ON THIS ROAD SO YOU MUST PULL OUT INTO TRAFFIC QUICKLY. WHEN DOING SO I PRESSED THE GAS PEDAL ALMOST TO THE FLOOR. THE CAR DID NOT SHIFT INTO ANY GEAR. IT WAS LIKE IT WENT INTO NEUTRAL. THE RPM'S REVED AND IT WOULD NOT MOVE. I WAS ALMOST HIT ON BOTH SIDES OF THE VEHICAL. THIS HAPPENED ON SATURDAY SEPT. 5TH. ON TUES. SEPT 8TH I WAS ON AN ON RAMP TO THE INTERSTATE. I ONCE AGAIN PRESSED FIRMLY ONTHE GAS PEDEL TO BE ABLE TO MEGER INTO TRAFFIC AND QUICKLY GET UP TO SPEED. WHILE DOING SO, THE CAR ACTED THE SAME WAY. IT WAS LIKE IT WAS IN NEUTRAL. I WAS ONCE AGAIN ALMOST HIT BY SEVERAL CARS. I CALLED FIAT IN PORTLAND AND DEMANDED THEY LOOK AT THE CAR. AT FIRST THEY COULD'NT GET ME IN AS THEY WERE OVER BOOKED. I EXPLAINED THAT I HAVE SURGERY IN MASS. ON FRIDAY THE 11TH AND I CANNOT DRIVE THIS CAR ON A FOUR LANE HIGHWAY. I FEEL EXTREMELY UNSAFE IN THIS VEHICLE. I HAVE MANY OTHER MECHANICAL PROBLEMS THAT THEY ARE LOOKING INTO AS WELL. THIS IS THE WORST CAR THAT I HAVE EVER PURCHACED. I HAVE ALSO CONTACTED FIAT USA.

NHTSA ODI #10762805

18,000 miles · Aug 28, 2015
Air BagsService BrakesCrashInjury

DRIVING DOWN THE ROAD WARNING LIGHTS CYCLED THROUGH FOR THE FIRST TIME EVER INDICATING ISSUES WITH ESC , DTS, A SPROCKET WITH AN EXCLAMATION POINT, A CAR ON ROUGH TERRAIN, THIS CONTINUED AS I TRAVELED DOWN THE ROAD...ALL OF THESE LIGHTS ARE INDICATORS OF ISSUES WITH THE ABS SYSTEM I MOVED TO THE RIGHT LANE STEERING WAS DIFFERENT…

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DRIVING DOWN THE ROAD WARNING LIGHTS CYCLED THROUGH FOR THE FIRST TIME EVER INDICATING ISSUES WITH ESC , DTS, A SPROCKET WITH AN EXCLAMATION POINT, A CAR ON ROUGH TERRAIN, THIS CONTINUED AS I TRAVELED DOWN THE ROAD...ALL OF THESE LIGHTS ARE INDICATORS OF ISSUES WITH THE ABS SYSTEM I MOVED TO THE RIGHT LANE STEERING WAS DIFFERENT I WAS TRYING TO GET OFF AT THE NEXT EXIT HOWEVER AS TRAFFIC SLOWED I WAS UNABLE TO STOP MY VEHICLE AND MY BRAKES REACTED DIFFERENTLY WHEN I PUT MY FOOT ON THE BRAKES AND I REAR ENDED THE PERSON IN FRONT OF ME

NHTSA ODI #10759957

39,000 miles · Aug 28, 2015
EngineFire

TL* THE CONTACT OWNS A 2014 FIAT 500. WHILE STOPPED AT A TRAFFIC LIGHT, THE VEHICLE JERKED VIOLENTLY. A MESSAGE APPEARED ON THE DASHBOARD INSTRUCTING THE CONTACT TO PLACE THE TRANSMISSION SHIFTER IN THE NEUTRAL POSITION AND THEN INTO THE DRIVE POSITION. THE CONTACT FOLLOWED THE INSTRUCTIONS AND THE ENGINE FAILED WITHOUT WARNING.…

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TL* THE CONTACT OWNS A 2014 FIAT 500. WHILE STOPPED AT A TRAFFIC LIGHT, THE VEHICLE JERKED VIOLENTLY. A MESSAGE APPEARED ON THE DASHBOARD INSTRUCTING THE CONTACT TO PLACE THE TRANSMISSION SHIFTER IN THE NEUTRAL POSITION AND THEN INTO THE DRIVE POSITION. THE CONTACT FOLLOWED THE INSTRUCTIONS AND THE ENGINE FAILED WITHOUT WARNING. THE CONTACT ATTEMPTED TO RESTART THE ENGINE MULTIPLE TIMES BEFORE SUCCEEDING. THE CHECK ENGINE WARNING LIGHT THEN ILLUMINATED. THE CONTACT STATED THAT THE VEHICLE WAS RELUCTANT TO ACCELERATE AND DRIVE SLOWLY. THE CONTACT ALSO NOTICED A BURNING ODOR. THE CONTACT DISCOVERED THAT THE ODOR WAS COMING FROM UNDER THE HOOD. THE VEHICLE WAS TOWED TO A DEALER BUT WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 39,000. THE CONSUMER STATED THE VEHICLE WAS TAKEN TO THE DEALER ON MULTIPLE OCCASIONS FOR THE JOLTING. THE DEALER ADVISED THE COMPUTER WAS LEARNING THE DRIVER'S HABITS AND WAS OPERATING AS DESIGNED. AFTER THE FAILURE, THE VEHICLE WAS TOWED TO THE DEALER AND WAS REPAIRED UNDER WARRANTY. THE MANUFACTURER OFFERED A 60,000 MILE WARRANTY, NO DEDUCTIBLE, FREE OF COST AND $500.00 FOR COMPENSATION. THE CONSUMER WAS DISSATISFIED WITH THE OFFER. UPON RETRIEVING THE VEHICLE THE DEALER ADVISED THE CONSUMER TO PUT THE VEHICLE IN NEUTRAL WHILE AT A STOP, BECAUSE ONE OF THE CLUTCHES SLIGHTLY DRAGS AND WOULD EVENTUALLY BURN UP, WHICH IS WHAT CAUSED THE FAILURE. THE CONSUMER BELIEVED THAT WAS UNACCEPTABLE.*JS

NHTSA ODI #10759913

1,045 miles · Aug 24, 2015
EnginePower Train

TL* THE CONTACT OWNS A 2014 FIAT 500. WHILE DRIVING AT APPROXIMATELY 30 MPH, THE TRANSMISSION TEMPERATURE GAUGE WARNING LIGHT ILLUMINATED AND A VOICE ACTIVATED INDICATING THAT THE CLUTCH WAS OVERHEATING AND WARNED THE CONTACT TO PARK THE VEHICLE IMMEDIATELY. IN ADDITION, THE CONTACT STATED THAT WHEN THE VEHICLE WAS PARKED IN VAR…

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TL* THE CONTACT OWNS A 2014 FIAT 500. WHILE DRIVING AT APPROXIMATELY 30 MPH, THE TRANSMISSION TEMPERATURE GAUGE WARNING LIGHT ILLUMINATED AND A VOICE ACTIVATED INDICATING THAT THE CLUTCH WAS OVERHEATING AND WARNED THE CONTACT TO PARK THE VEHICLE IMMEDIATELY. IN ADDITION, THE CONTACT STATED THAT WHEN THE VEHICLE WAS PARKED IN VARIOUS WEATHER CONDITIONS, THE SHIFT LEVER FAILED TO SHIFT OUT OF THE PARK POSITION. THE FAILURE RECURRED INTERMITTENTLY. THE VEHICLE WAS TOWED TO A DEALER, WHERE IT WAS INSPECTED BUT THE CAUSE OF THE FAILURE WAS NOT DETERMINED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 1,045.

NHTSA ODI #10759002

Official recalls

3

24V474000 · Tires:pressure Monitoring And Regulating Systems

Jun 25, 2024

Chrysler (FCA US, LLC) is recalling certain 2014-2019 Fiat 500 vehicles. The tire pressure monitoring system (TPMS) warning light may not illuminate as intended. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 138, "Tire Pressure Monitoring Systems."

Consequence & remedy

Consequence: A TPMS warning light that fails to illuminate can result in the vehicle being driven with improperly inflated tires, increasing the risk of a crash.

Remedy: Dealers will reprogram the TPMS electronic control unit module, free of charge. Owners were mailed July 11, 2024. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLC's number for this recall is 80B.

16V302000 · Power Train:manual Transmission

May 16, 2016

Chrysler (FCA US LLC) is recalling certain model year 2012-2016 Fiat 500 vehicles manufactured June 21, 2010, through January 12, 2016, equipped with a manual transmission. The clutch diaphragm spring may fracture and fail, causing an inability to switch gears.

Consequence & remedy

Consequence: If the clutch diaphragm spring fails, the driver may not be able to shift gears or the vehicle may lose motive power, increasing the risk of a crash.

Remedy: The remedy for this recall will include the installation of a clutch pedal limiter and a clutch pedal switch. The recall began on November 10, 2016. Owners may contact Chrysler customer service at 1-800-853-1403. Chrysler's number for this recall is S34.

15V291000 · Power Train:automatic Transmission

May 18, 2015

Chrysler (FCA US LLC) is recalling certain model year 2013-2015 Fiat 500 battery electric vehicles manufactured March 8, 2013, to March 7, 2015. The Electric Vehicle Control Unit (EVCU) of the affected vehicles may set a diagnostic trouble code (DTC) that may cause the transmission to unexpectedly shift to neutral.

Consequence & remedy

Consequence: If the vehicle unexpectedly shifts to neutral, the loss of drive could increase the risk of a crash.

Remedy: Chrysler will notify owners, and dealers will reprogram the EVCU, free of charge. The recall began June 19, 2015. Owners may contact Chrysler customer service at 1-800-853-1403. Chrysler's number for this recall is R20.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

1

EA19001 · Electrical Overstress

Opened Apr 19, 2019 · Closed Sep 19, 2024

Status: closed (inferred from source dates) · Air Bags: Air Bag/restraint Control Module

The Office of Defects Investigation (ODI) opened this investigation to determine if the failure of airbags to deploy during severe crashes, in certain vehicles, was the result of a safety related defect.  During the investigation a complex failure was studied that can result in non-deployment of subject vehicle air bags and other restraint system devices in severe crash events. The subject vehicles may be equipped with an airbag control unit (ACU) for the supplemental restraint system (SRS) Electronic Control Unit (ECU) manufactured by ZF-TRW.  The ECU receives signals from crash sensors mounted in the vehicle and deploys the vehicle air bags and seat belt pretensioners in accordance with manufacturer design specifications.  The ECU in the subject vehicles contains a model DS84 application-specific integrated circuit (ASIC) which controls the communication of the crash sensor signal, firing commands (i.e., when to deploy the airbag(s) and/or pretensioners), and fault information (e.g., diagnostic trouble codes). In September 2016, FCA announced recall 16V-668 for certain model year (MY) 2010 to 2014 Chrysler, Dodge and Jeep products manufactured with the subject ZF-TRW ACU.  In this recall, FCA discussed an EOS condition that resulted in a failure of the subject DS84 ASIC, which caused air bag non-deployment.  FCA noted that the defect condition had only been observed in vehicles equipped with sensor harnessing routed across the front of the vehicle.  Other FCA vehicles that also used the subject ACU, but were not equipped with cross-car harnessing, had not experienced EOS failures, despite similar time in service. During the course of this investigation, ODI sent two separate Information Request (IR) letters to six vehicle manufactures (including FCA, Hyundai, Honda, Kia, Mitsubishi, and Toyota) and one IR letter to ZF-TRW.  These IR letters resulted in ODI receiving comprehensive data from these manufacturers and suppliers. Studies of this data found that the DS84 ASIC does not have sufficient protection against negative electrical transients or electrical overstress (“EOS”) that can be generated in certain severe crashes.  An electrical transient occurs when the electrical power supplied to a circuit changes momentarily over a short duration of time.   In these severe crash cases, the crash sensors and other powered wiring can be damaged and short circuited so as to create a negative electrical transient of sufficient intensity and duration (that are outside the vehicle manufacturer's specification) to damage the ASIC before the restraint device deployment signal is received by the SRS ECU.  This damaged signal can lead to incomplete or nondeployment of the air bags and/or pretensioners.  Airbag non-deployment and/or lack of pretensioner operation can increase the risk or severity of injury in a crash.A total of 8 fatalities and 14 injuries were associated with known EOS events. The common element in all investigated manufacturers vehicles is the SRS ECU containing a DS84 ASIC manufactured by ZF-TRW.  The risk associated with the ASIC is equally shared among all OEMS involved in the investigation.  The actual real-world risk can be mitigated by other factors which were assessed by ODI during this investigation. The first mitigating factor involves protections built into the ACU design which protect the DS84 ASIC from damage.  There are multiple strategies and levels of protection employed by different OEMs that provide effective EOS mitigation.  The two most common strategies at the ACU level are circuit protection diodes on the remote senor signal lines, and current limiting resistors that protect critical components. The second mitigating factor is found at the vehicle level and involves the location and routing of the wires leading from the crash sensors to the SRS ECU.  If the wires are well protected in a crash and are not routed with other power wires carrying large currents, the risk for an EOS event is significantly reduced or eliminated. These design specific factors combine to produce a spectrum of risk for the vehicles equipped with ACUs using the DS84 ASIC.  Given the many of years of field exposure, it is possible to divide the subject population into two groups; vehicles which have experienced EOS events, and vehicles which have not experienced EOS field events. Four of the six OEMs involved in this investigation have experienced EOS field events on at least one of their models equipped with a DS84 ASIC.  All vehicle models (including the Toyota models identified in the Failure Report Summary of the opening resume for this investigation) with field events have been recalled.  In an abundance of caution, ODI kept this investigation open five years to monitor field performance and did not identify any field events on vehicles not included in existing safety recalls. Given the spectrum of risk identified in this investigation and that all vehicles with a demonstrated unreasonable risk have been recalled, ODI is closing this investigation. ODI is closing this investigation with the following manufacturer safety recalls: 16V-668, 18E-043, 18V-137, 18V-363, and 20V-024.  With the recall actions taken by the subject vehicle and equipment manufacturers, this investigation is closed. The closing of this investigation does not constitute a finding by NHTSA that a safety-related defect does not exists on other model or model year vehicles outside of the recall scopes. The agency reserves the right to take further action if warranted by the circumstances.