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My Fiat 500C's stop-start is playing up...

Hi,

I have a 2012 Fiat 500c manual. Over the past year, the stop-start has intermittently stopped working, warning light comes on saying stop-start not available and a yellow triangle. The last few months is has been happening more often, now warning light on constantly. I had the battery checked and it was 80 per cent. Charged battery and today warning light was on constantly for six miles, drove again and stop-start worked or at least no warning light for about a mile, then on again, tried quickly turning key in ignition 6 to 10 times and warning light stayed off for another 1/2 mile or so then back on, had a hose replaced in February from radiator and it started to say unavailable about middle of March. It's not affecting driving any other way just really annoying, don't know if a new battery will fix it. Fiat dealers are closed at the moment due to COVID-19 or I would have taken it for a diagnostic test.

Hope I've made sense.

What's up with my stop-start feature?

Hi

Regarding the stop-start feature, I was told that I needed to recharge my battery by going on a 20-minute journey driving over 50mph. I have done two 125-mile journeys in the last month and it still is not working; this was done with no radio, heaters or devices charging. I was also told that engine will only stop start for so many times, and is there I a way of resetting this?