Hi all,

I have a 2019 fiesta 1.0 eco boost. It is fitted with auto stop/start. Last couple of week it hasn’t operated at all.. 

I do know that certain conditions over ride it ie: very cold weather, a lot of ancillaries on etc. However, there is no function with equipment off and fairly good outside temperatures. 
Anyone had a similar experience or any ideas please.

regards Ty

https://www.fordownersclub.com/search/?q=Stop start&quick=1&updated_after=any&sortby=relevancy&search_in=titles&search_and_or=and

4 hours ago, Ty J said:

Hi all,

I have a 2019 fiesta 1.0 eco boost. It is fitted with auto stop/start. Last couple of week it hasn’t operated at all.. 

I do know that certain conditions over ride it ie: very cold weather, a lot of ancillaries on etc. However, there is no function with equipment off and fairly good outside temperatures. 
Anyone had a similar experience or any ideas please.

regards Ty

I wouldn't worry if it works it just means your battery is tip-top condition, and when it is working most of us turn it off as it's annoying if you're in slow moving traffic

@Ty J Take a look my post - I had a similar issue with my '22 Focus ST - this should be helpful but will more than likely have involve the dealership.

https://www.fordownersclub.com/forums/topic/138944-ford-focus-st-22-battery-drain/#comment-959800

21 minutes ago, LukeJQuinn said:

@Ty J Take a look my post - I had a similar issue with my '22 Focus ST - this should be helpful but will more than likely have involve the dealership.

https://www.fordownersclub.com/forums/topic/138944-ford-focus-st-22-battery-drain/#comment-959800

Battery drain isn’t the same thing as just stop start not working. 

@alexp999 As you can see from my post, Stop/Start is the first to stop working when the battery is not being charged. I've spent two weeks talking to Ford about my issue, and the first thing to stop working was stop/start, then the keyless entry and so on. 

Stop/Start needs the battery to be at least 70% charged in order to kick it (and heated windscreen off of course) otherwise it will never kick in. 

My advice @Ty J is to get your battery tested, just to see how much charge it is holding. If it so happens its holding a charge and above 70% then it means you can rule the battery out and get Ford looking deeper into it. 

8 hours ago, LukeJQuinn said:

@alexp999 As you can see from my post, Stop/Start is the first to stop working when the battery is not being charged. I've spent two weeks talking to Ford about my issue, and the first thing to stop working was stop/start, then the keyless entry and so on. 

Stop/Start needs the battery to be at least 70% charged in order to kick it (and heated windscreen off of course) otherwise it will never kick in. 

My advice @Ty J is to get your battery tested, just to see how much charge it is holding. If it so happens its holding a charge and above 70% then it means you can rule the battery out and get Ford looking deeper into it. 

Oh I know I had the exact same issue as you. 
 

But OP is only talking about stop start and this comes up every year we have hundreds of threads about stop start especially coming in to autumn/winter. It’s just doing what it is designed it’s not battery drain unless other systems start shutting down too. 

4 hours ago, alexp999 said:

Oh I know I had the exact same issue as you. 
 

But OP is only talking about stop start and this comes up every year we have hundreds of threads about stop start especially coming in to autumn/winter. It’s just doing what it is designed it’s not battery drain unless other systems start shutting down too. 

 

17 hours ago, Ty J said:

Hi all,

I have a 2019 fiesta 1.0 eco boost. It is fitted with auto stop/start. Last couple of week it hasn’t operated at all.. 

I do know that certain conditions over ride it ie: very cold weather, a lot of ancillaries on etc. However, there is no function with equipment off and fairly good outside temperatures. 
Anyone had a similar experience or any ideas please.

regards Ty

It’s very simple. You will find that if you  fully charge the battery with a charger that the problem usually disappears for a while. If it does then the only resolution is to change the battery.

23 minutes ago, Mitch57 said:

It’s very simple. You will find that if you  fully charge the battery with a charger that the problem usually disappears for a while. If it does then the only resolution is to change the battery.

If you fit a new battery everytime stop start didnt work, you'd be changing it every few months.

There is nothing wrong with the battery 99% of the time, it's just doing what it is designed.

So many times has this been covered on here, it's doing what it's designed to do, just use the car normally and don't worry about it.

Be easier to tell the dealerships to alter the parameters of SOC to 90% and also alter the battery size to what is actually fitted to the car both within Forscan.

Problem sorted 👍

The default SoC is designed to reduce fuel and emissions.

I don't understand the desire to need stop/start to work more than it has to.

There seems to be those that think it should work 100% of the time, those that think it should be disabled, and not just accept Ford spent a lot of R&D to push their emission figures down, so the balance of the default SoC is good for most people. If it doesn't stop it's just charging your battery or one of the many other conditions for it not to stop.

19 hours ago, Ty J said:

Hi all,

I have a 2019 fiesta 1.0 eco boost. It is fitted with auto stop/start. Last couple of week it hasn’t operated at all.. 

I do know that certain conditions over ride it ie: very cold weather, a lot of ancillaries on etc. However, there is no function with equipment off and fairly good outside temperatures. 
Anyone had a similar experience or any ideas 

 

 

    
 

    

 

 

  
 

 

19 hours ago, Ty J said:

Hi all,

I have a 2019 fiesta 1.0 eco boost. It is fitted with auto stop/start. Last couple of week it hasn’t operated at all.. 

I do know that certain conditions over ride it ie: very cold weather, a lot of ancillaries on etc. However, there is no function with equipment off and fairly good outside temperatures. 
Anyone had a similar experience or any ideas please.

regards Ty

Get into car and switch on ignition (not engine)

Turn on headlights 

Flash high beam 5 time

Press brake pedal 3 times 

Brake fault light on dash should flash after several seconds

Switch off ignition 

Worked for me. 

You should only ever reset the Battery monitoring when you've changed the battery or charged it outside the car.

No need to do it otherwise.

Maybe so, but the above has worked for me. 

What problems can happen resetting battery monitor if battery hasn't been disconnected from car? 

10 minutes ago, auldreekie said:

Maybe so, but the above has worked for me. 

What problems can happen resetting battery monitor if battery hasn't been disconnected from car? 

You wipe out all knowledge the car has about the battery, how worn it is, how charged it is.

It messes up the ability of the adpative charging system to effectively and safely charge the battery without causing excessive wear to it.

The car has to relearn this by trial and error. Its possible that excessive BMS resets are actually shortening the life of the battery.

This is why if you need to charge the battery it is recommend to charge it in the car, with the negative on a "ground" point so that the BMS can account for the charge.

EDIT:

The only reason it will get stop/start working is because the car doesn't know the SoC, the BMS has been reset, it will assume a new or fully charged battery and so enable stop/start until its figured out your actual SoC. Big current draws from a restart on a battery that's not at a reasonable charge will not do it much good either.

Wow everyone.

 A great big thank you to everyone who provided so much detailed information.

Cheers

Ty

Anecdotal, but I did find with my missus fiesta and my focus that if you hold gears longer when you drive more exuberantly s/s seems to work more often than not. But to be quite honest as others have said it’s not worth worrying about.