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Coding required after battery change?

jobjo
jobjo
in Ford Fiesta Club

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My girlfriend has a 2015 ecoboost. I recently changed the battery on it. I'm not sure what the old one was, but the new one is an EFB. Do i need to code it or something or is it just plug and play? I have read earlier models needed a radio code or something, but radio works fine here now after replacing. 

I have also heard about a reset sequence where you put on the ignition, wait 10 secs, and then press fog light button 5 times and hazard button 3 times. Is that something I need to do?

Lastly I see there is a start/stop button above the stick. If you press it, the "off" light comes on. Meaning that the start/stop function has been activated all this time. But according to her, it has never worked. I suppose it should work by stopping the engine when you stop at traffic lights etc? It does not do that. 

Thanks!

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    You need to reset the BMS when fitting a new battery. That sounds like the sequence you heard. Lots of videos on youtube showing how it's done.

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    • Like 3

    Here's just one...

     

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    • Author

    any idea why the start stop is not working?

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    Just now, jobjo said:

    any idea why the start stop is not working?

    If you haven't reset the BMS, it thinks the battery is old.

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    • Like 2
    • Author

    strange that it never has worked though. Could it be the old battery was not start stop compatible? It was a 60ah Silver Calcium battery. 

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    2 minutes ago, jobjo said:

    strange that it never has worked though. Could it be the old battery was not start stop compatible? It was a 60ah Silver Calcium battery. 

    Do a search on the forum for, 'start/stop issues'. The car needs to meet about 100 conditions before it will start to operate and is exceptionally voltage sensitive. Nothing more than a gimmick anyway, and I wouldn't lose a seconds sleep over it not working. As already stated, do a BMS reset, and if the battery is pumping out at least 12.8v, you should be in action.  

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    • Like 2
    7 minutes ago, jobjo said:

    strange that it never has worked though. Could it be the old battery was not start stop compatible? It was a 60ah Silver Calcium battery. 

    That's not the correct battery for stop/start.

    It has to be an EFB. The BMS can't detect the battery chemistry, but if it doesn't behave to charging as expected it probably then wouldn't enable stop/start.

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    • Like 2
    • Author

    yeah thats what i figured. Gonna try the BMS reset and see if it works with the new EFB battery. I see there are 2 different ways to do this, apparently for older models it is the fog light/hazard light one, and for newer cars it is the headlight/brake one. But I cant find out exactly what model year they started the last one. I'll try the fog light method first, cant do any harm I guess. 

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    • Like 1
    2 hours ago, jobjo said:

    yeah thats what i figured. Gonna try the BMS reset and see if it works with the new EFB battery. I see there are 2 different ways to do this, apparently for older models it is the fog light/hazard light one, and for newer cars it is the headlight/brake one. But I cant find out exactly what model year they started the last one. I'll try the fog light method first, cant do any harm I guess. 

    I have a 2015 focus and the correct procedure is the fog light button procedure for resetting BMS, the headlight brake light came a lot later I do believe in the mk4

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