Expert answer

Hi Tina,

There can be many different reasons for a start-stop system not to work. We get so many queries about it that we wrote this feature: Why won't my car's stop-start system work?

Expert answer

Hi Wendy,

We get a lot of queries from people with cars that have stop-start issues. We've published this article to help: Why won't my car's stop-start system work?

Saying all that, we also know that the Fiat 500's engine can develop a couple of issues that may be relevant to you, including a problem with the alternator belt tension (and hence battery recharging when on the move) and another with the engine control unit.

Sadly, unless you're comfortable with checking the alternator belt for yourself, these items will have to be checked by a mechanic. 

Expert answer

Hi Gerald,

Most stop-start issues can be traced to a problem with the battery. Perhaps with such low mileage it isn't being kept topped up. Regardless, we suggest you read the feature we wrote about this, called Why won't my car's stop-start system work?

Expert answer

Hi Andres,

Stop-start systems regularly stop working. So much so that we've written a guide on the subject: Why won't my car's stop-start system work?

Expert answer

Hi John,

There's a lot less going on in the exhaust aftertreatment of a modern petrol engine than the equivalent diesel so I suspect the diesel needs the warm-up more. It may also be due to the extra strain on the starter and battery due to the high compression of the diesel engine. When the oil is cold, the friction may be higher, causing a higher strain again. 

Either way, it's nothing to worry about.

Expert answer

Hi Sue,

Sounds to us that the battery could be in poor condition. Lots of cars develop issues with their stop-start systems. We get so many questions about it that we wrote a feature about it all - Why won't my car's stop-start system work?

Expert answer

Hi Dave,

I'm surprised to hear that from a new truck where the battery will be in good condition, but stop-start systems regularly don't work as people expect. The system measures loads of variables before deciding whether the engine will be stopped, including the temperature of the engine and even the outside temperature. If it's cold weather, it may not work at all. If you're using items that are a big electrical drain, it may not operate. 

Read our Why won't my car's stop-start system work? feature

Expert answer

Hi Sherry,

It should not, no, though you are likely to get a warning light in the dashboard.

Read our Why won't my car's stop-start system work? feature on why that might be happening.

Expert answer

Hi Sandra,

It shouldn't cause any damage, but it could indicate a weakness in your battery or electrical system, so it's best to have it looked at when you can. 

Read our Why won't my car's stop-start system work? feature for more information

Expert answer

Hi Pat,

We certainly have noticed this trait in all Volkswagen Group DSG-based gearboxes (that's what the S tronic transmission is) and their attendant engines of late. The only explanation seems to be that VW’s various brands have trimmed back both engine power and responsiveness at low speeds, and especially at idle or when waking up from a stop-start cycle, in order to optimise their figures in the new WLTP emissions and economy tests. VW is certainly not the only one to do this, but it does seem to be more obvious with VW Group models than with some other manufacturers. Shifting the gearbox into Sport helps a bit, but it’s not a total fix.

One cure might be a total vehicle upgrade — we’ve noticed that the new ‘Evo’ versions of the 1.5 TSI petrol and 2.0 TDI diesel engines are noticeably less sleepy. Or, alternatively, trade in for a version with a manual gearbox — that is the simplest cure of all.