Problems · by component
2012 Fiat 5 Series electrical system problems
63 owner complaints to NHTSA about the 2012 Fiat 5 Series cite electrical system, 16% of all 396 complaints for this model year.
Complaints
63
16% of all complaints
Crashes
3
Reported by owners
Fires
3
Reported by owners
Injuries
1
Reported by owners
What owners say about the electrical system
Verbatim from NHTSA complaints, newest first
“The vehicle had been stalling out on numerous occasions one being a freezing Xmas eve in Drive thru if it had happened somewhere isolated the driver could have frozen. I rented cars several times and replaced the alternator ,battery and at the final point at the dealership the mechanic suggested I purchase a $600 battery though I had a brand new one. The dealership gave me a $200 credit but it happened again, the mechanic in town said the Bluetooth component was draining the battery. They removed it and no problem since. The dealership mechanic talked around the issue and would not answer my questions about this. The safety issues related to this are dangerous and it appears to be known by mechanics about this model.”
“The wiring harness bundle leading to the trunk failed between the trunk & upper drivers side of the car. Upper brake lights stopped working, then rear defroster, then trunk wouldn’t open & I got a license plate light warning on the dash. Mechanic tried to replace switch, still didn’t work, the tried to replace handle (with license plate light). Mechanic broke more wires in bundle, back brake lights stopped working. The wiring harness bundle leading into the trunk is defective.”
“In the morning (6AM) of September 19, my car car caught on fire while parked in my driveway. There were flames 3-4 feet height coming from the engine hood area. Once the fire was extinguished by the local fire department, I found the car was extensively damaged in the front outside and inside driver cabin. Upon further inspection I found the fire might have started with or around the battery, as it was completely melted. Further inspection on the back side of the car showed some stripped wiring in the assembly connecting to the rear hatch mechanism, lights, and other. In the days previous to this incident the battery had loss its charge completely twice in the span of a week and a half.”
“I bought this car about a year ago, ever since I got the car the first issue started within a month it just started to shut off for no reason first at a traffic light, afterward while I was driving called the dealership who sold me the car I was told to bring it to find out they did not have a certified Fiat Mechanic that would be able to look at the car so it was towed to another dealership. I was told they fixed the issue but once again the vehicle started doing the same thing even more frequently fast forward my car has yet to be fixed I feel like I am going to get rear-ended and hurt really bad and all I get from the dealership is that they can't fix it. My question to them is why I sell me a car that you knew you could not repair or you knew you really didn't check properly as per your words you don't have a certified mechanic.”
“Check engine light keeps reappearing after the parts have been replaced with new parts the computer codes stated need replacement. Specifically, the spark plugs and coil packs. They’ve been replaced twice now. And the light keeps coming back.”
“THE REAR HIGH BRAKE LIGHT WIRING ON THE CONVERTIBLE WEARS AND BREAKS IN THE DRIVER'S SIDE C PILLAR DUE TO USE OF THE CONVERTIBLE TOP RENDERING THE BRAKE LIGHT NON-OPERATIVE. THIS SEEMS TO BE A COMMON PROBLEM WITH THE FIAT 500 CONVERTIBLE.”
Showing 6 of 63 reports. Read every report on NHTSA.gov.
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 11, 2026NHTSA vehicle page
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.