It could be also a not sufficient charged battery...

My 2011 500 TA shows exactly the same symptoms in the winter period, if not charged externally.

It seems that the battery is not charged sufficiently in cold whether, even if you drive 60km per day.
The reason seems that the charging system does not increase the Voltage if outside temperate becomes lower, what is necessary to charge a lead acid battery sufficiently.

By using an external charger ones a week it works quite good for my TA.

What I also learned:
Start&Stop needs everyday training, to work properly according to my experience. Driving long distances, without sufficient Stops and Starts is not enough.

It seems also that it is a good idea to discharge the battery for 10 min with turn on all electrical equipment before charging externally to train the battery.

How old are your cars and batteries ? Are both cars used in the same way?

Even battery replacement did not solve the problem for my car.

In periods of cold whether (I got 3 new battery's in warranty period of 2 years...) the problem remained.

It seems also that different versions of S&S might exist:

My version always stops the engine, even if battery is not in good condition and restarts seconds later.
Other versions seems to avoid engine stop if battery is not properly charged. No question what is better...

larslarsen said:

What I also learned:
Start&Stop needs everyday training, to work properly according to my experience. Driving long distances, without sufficient Stops and Starts is not enough.

Click to expand...

UFI is mostly used on longer trips and has no such issues.I usually do around 100km with only around 6-8 stop/start events at the beginning and end of the trip. My battery is a non-S/S type but a 120Ah capacity and is charged daily.

My car is used about four days in any week and averages about 20-25km per day with frequent stops. After the first 10 or so minutes driving the S/S starts to operate, sometimes prematurely re-starting the engine on the first occasion but after that functioning normally.

I have never charged the battery but even after three days parked up it performs as above.

UFI said:

UFI is mostly used on longer trips and has no such issues.

Click to expand...

No question, but in Australia the outside temperature in cold whether period is much higher compared to Germany (never below zero I suspect). If temperature is above 5 - 10 Celsius I have also no problem with S&S, means no external charge of the battery is required.

Certainly can't argue with that Lars, and very cold weather isn't kind to batteries, but I suspect it's irrelevant to the OP's problem as he's also in Oz.

I've seen many references to a "learning period" related to the S/S system but haven't experienced any such. When I picked up my car after FIAT finally relented and replaced the battery the S/S started functioning within five minutes of leaving the dealership, i.e. as soon as the car was warm enough and, as stated, has worked ever since.

No learning period for ours too.

Three year old TA and SS worked for a few seconds only. Battery charged in and out of the car until I was blue in the face, but still rubbish.

Bought a new battery, and SS has worked perfectly from the minute the car is warm. Long drives, short drives, multi SS trips, all work perfectly every single time. It works so reliably now, I don't even think about it. (or worry about it)

Regards,
Mick.

UFI said:

......
My battery is a non-S/S type but a 120Ah capacity and is charged daily.

Click to expand...

Interesting, but how does it fit in the battery holder?
Could you post type and brand (or link) for that battery?

Mick F said:

....



Bought a new battery, and SS has worked perfectly from the minute the car is warm.

Click to expand...

Maybe my dealer always installed bad quality batteries (2x Exide, 1x Bosch), I can't believe. It was always the S&S EFB type.
Which brand an type did you got?

larslarsen said:

Interesting, but how does it fit in the battery holder?
Could you post type and brand (or link) for that battery?

Click to expand...

The original S/S battery is HUGE for only 63Ah (yes the battery is as big as the 120Ah in my 4.0L Jeep!). It turns out that a standard 120Ah battery fits 100% the same as the OEM battery (it's an Australian brand 'Supercharge'). I've been running it for a year now with no problems (but I realise I'm not a typical user). Keep in mind the TA has a 120A alternator so it needs a big battery to handle those currents.

larslarsen said:

Maybe my dealer always installed bad quality batteries (2x Exide, 1x Bosch), I can't believe. It was always the S&S EFB type.
Which brand an type did you got?

Click to expand...

It was one of these:
Varta Start-Stop EFB Car Battery (027EFB) (D53): Amazon.co.uk: Car & Motorbike
Varta Start-Stop EFB Car Battery (027EFB) (D53)

Ours works perfectly every single time, though maybe where you are the winter and cold weather may upset any battery. You would think that yours would be fine for most of the year though.

Cheers,
Mick.

Is there any way of permanently disabling it?
It's very annoying and I think my late 2011 built car is before the firmware upgrade..

Maurice70 said:

Is there any way of permanently disabling it?

Click to expand...

Can I ask why you would want to?

I must say, that it took some getting used to, but now I hardly notice it at all. It works reliably and predictably, and restarts immediately the clutch is depressed. It'll remain stopped for the full 3 minutes as per the specification.

When I drive our other car without SS, I find it strange (and slightly annoying) that it doesn't stop the engine when I do!

Regards,
Mick.

Maurice70 said:

Is there any way of permanently disabling it?

It's very annoying and I think my late 2011 built car is before the firmware upgrade..

Click to expand...

I think it is not, but your car might get the update for S&S as my 03/2011 TA got in 2013(?).
After you are able to switch it off, but you have to live with the warning light on.

In the Twinair 500 dualogic I think its dangerous..especially at intersections when you want to take off quickly..My wife was driving my 500 for the first time and she came to a T intersection and went to take off quickly and the car had stopped and then started again..
If it's main purpose is saving fuel then it's not a real concern to me as fuel in Australia isn't too expensive as opposed to European market..
I always forget to switch it off whenever I get into the car..
My wifes Alfa giulietta has the function but it can be switched off and left off until you want to reactivate it,just wish I could do the same with the 500.
It's not a big deal but it's probably the only gripe i have with the car,that and wish the passenger side electric window had an auto up feature as well..

Can't for the life of me work out why the drivers side goes up and down with auto but the passenger side goes down with auto but not back up...maybe there's something wrong with mine?
Yes I know first world problems

Ah, I see.
Dualogic cars could be a problem with SS.

I drive the local community bus and it's a Fiat with Dualogic. TBH, i don't like it as it often hesitates too long before changing up especially pulling away up a hill. One or two of the drivers refuse to use it in Auto and do all the shifts manually.

The bus doesn't have SS thank goodness.

Regards,
Mick.

Ok thanks Lars,I'll find out from the dealership of my car can receive the FW update..

Maurice70 said:

In the Twinair 500 dualogic I think its dangerous..especially at intersections when you want to take off quickly..My wife was driving my 500 for the first time and she came to a T intersection and went to take off quickly and the car had stopped and then started again..
If it's main purpose is saving fuel then it's not a real concern to me as fuel in Australia isn't too expensive as opposed to European market..
I always forget to switch it off whenever I get into the car..
My wifes Alfa giulietta has the function but it can be switched off and left off until you want to reactivate it,just wish I could do the same with the 500.
It's not a big deal but it's probably the only gripe i have with the car,that and wish the passenger side electric window had an auto up feature as well..

Can't for the life of me work out why the drivers side goes up and down with auto but the passenger side goes down with auto but not back up...maybe there's something wrong with mine?
Yes I know first world problems

Click to expand...

Do you mean that your Stop/Start comes back on next time you start the car? Mine remains off until the switch is pressed again.

I think it's got more to do with meeting emissions targets than saving fuel.

As to the windows, that's supposed to be a safety thing to prevent unwary fingers getting caught but I do find it annoying. The driver's window does the same if you operate it (up or down) after the ignition's switched off. Closing the roof also requires the button to held for the last 250mm.

Maurice70 said:

In the Twinair 500 dualogic I think its dangerous..

Click to expand...

My 500 doesn't have dualogic, but I made two test drives with a 500 with dualogic. It took me only a few minutes to find out that I could easily prevent S&S stopping the engine by releasing the brake pedal on time. Only if you keep your foot on the brake pedal, and annoy the people behind you with your brake lights, S&S will stop the engine.

Maurice70 said:

Is there any way of permanently disabling it?

Click to expand...

You could fit a supercapacitor bank across the battery terminals, or replace the battery with a LiFePo4. There are probably another half a dozen ways you could inhibit S/S depending on how handy you are.

Piccolo Nero e Bella said:

Do you mean that your Stop/Start comes back on next time you start the car? Mine remains off until the switch is pressed again.

I think it's got more to do with meeting emissions targets than saving fuel.

As to the windows, that's supposed to be a safety thing to prevent unwary fingers getting caught but I do find it annoying. The driver's window does the same if you operate it (up or down) after the ignition's switched off. Closing the roof also requires the button to held for the last 250mm.

Click to expand...

I think if your car is a newer model than mine then maybe in the newer models Fiat gave you the option to be able to turn it off and it remains off until you turn it back on again,even after turning the car off..

I don't drive my car everyday and only remember to turn it off after the first time I come to a stop..
Having said that I've only had the car for a month so I guess I'll eventually get into the habit of turning it off after starting the car..