Fiat 500e vehicle braking behavior is unexpectedly hard, sudden, or unpredictable until the user uses an obd scan tool with appropriate diagnostic software- and initiates brake controller sensor re-calibration. this option is found under the diagnostic menu under: abs>renenerative brake controller>active diagnostics, and then selecting the procedure to start (rbc sensor calibration). online forum users (please see link below) are currently using 3rd party software, at their own expense, to correct the braking deficiency (approximately $49). my personal vehicle was purchased used and was exhibiting sudden and unexpected braking issues at approximately 8,500 miles; this is in my opinion a very low number of miles to be experiencing regenerate braking and control issues. please reference the ongoing discussion thread at fiat 500e online forums: https://www.fiat500owners.com/threads/fix-grabby-brakes-for-70.149282/#post-1292483
The car stopped working in the middle of the highway, started to give error messages and turned on engine service, transmission and parking brakes lights. a few seconds after we just got the message: drive mode unavailable and the car stopped. it was really dangerous and my family and i were in a terrible risk of have a pretty bad accident. we are really lucky that nothing happened to us, we could die that night.