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Discussion Starter · #1 ·
Story:

Car hasn't been used for a about two weeks. No problems starting the engine. Took it for a 100 miles road trip on a motorway, then back into city traffic. The Stop-Start doesn't work. It used to work impeccably. Ahem...

I did not change the battery, not I would like to, as the car works fine, except for the Stop-Start.

So, what happens if I simply re-set the BMS?
 

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Super Moderator and Mr Grumpy
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The BMS should only be reset when a new battery is put on the car. There are many parameters as to why the stop start doesn't activate and not everything points to the battery needs replacing. I drove 450 miles and pulling into my drive it didn't work. 5 minutes into a journey the next day it works.
 

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Kuga ST Line X 1.5 Eco 180ps 6 Speed Auto AWD Magnetic
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Same here, can’t remember the last time my stop start worked, just saves me turning it off🤔
 

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Super Moderator and Mr Grumpy
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Stopped working on the wife's Mokka now it's got cold despite it having a new battery in September last year.
 

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Discussion Starter · #5 ·
The BMS should only be reset when a new battery is put on the car. There are many parameters as to why the stop start doesn't activate and not everything points to the battery needs replacing. I drove 450 miles and pulling into my drive it didn't work. 5 minutes into a journey the next day it works.
Fair enough, but then I'm one of those "curious guys", I'm in constant search of understanding WHY.

So, I appreciate your saying The BMS should only be reset when a new battery is put on the car, but then - I ask you WHY?

What would (will?) actually happen if I do reset the BMS and leave my old battery in. Any damage? If so, what exactly and - you've guessed it - WHY? 😄
 

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Enjoying the VIN-YA-LEE
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Fair enough, but then I'm one of those "curious guys", I'm in constant search of understanding WHY.

So, I appreciate your saying The BMS should only be reset when a new battery is put on the car, but then - I ask you WHY?

What would (will?) actually happen if I do reset the BMS and leave my old battery in. Any damage? If so, what exactly and - you've guessed it - WHY? 😄
When the AA man fitted our new battery he reset the BMS. He did say it wasn’t essential as the systems will relearn charging cycles and usage.
 

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Discussion Starter · #7 ·
When the AA man fitted our new battery he reset the BMS. He did say it wasn’t essential as the systems will relearn charging cycles and usage.
Right, but I'm not fitting a new battery.

I'm asking what would happen if I simply re-set the BMS on my Kuga, with my original (old) battery in.

Any thoughts...?
 

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2013 Titanium X with 2017 Powershift Conversion.
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Fair enough, but then I'm one of those "curious guys", I'm in constant search of understanding WHY.

So, I appreciate your saying The BMS should only be reset when a new battery is put on the car, but then - I ask you WHY?

What would (will?) actually happen if I do reset the BMS and leave my old battery in. Any damage? If so, what exactly and - you've guessed it - WHY? 😄
The BCM logs the battery age, and will adjust the charging strategy to suit the age and condition of the battery (basically a new battery can take more abuse than a 2 or 3 year old one).

I'm use some have said if the heating is on high, headlights on for long periods etc the Stop Start will deactivate to help the battery.

Basically it's a system to get the vehicle through Type Approval and Emissions testing.
 

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Discussion Starter · #9 ·
The BCM logs the battery age, and will adjust the charging strategy to suit the age and condition of the battery (basically a new battery can take more abuse than a 2 or 3 year old one).
That makes sense... yet my original question is still the same - what would happen if I reset the BMS on an old battery?

Any thoughts?
 

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That makes sense... yet my original question is still the same - what would happen if I reset the BMS on an old battery?

Any thoughts?
You can do it. The car will then start from scratch thinking it is a new battery. I reset the BMS on a Fiesta when the stop start wasn't working, Fully charged it (stop start still wasn't working) reset BMS and then it did work, and carried on working for the next 2 years until it was sold.
 

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Discussion Starter · #11 ·
You can do it. The car will then start from scratch thinking it is a new battery. I reset the BMS on a Fiesta when the stop start wasn't working, Fully charged it (stop start still wasn't working) reset BMS and then it did work, and carried on working for the next 2 years until it was sold.
Thanks, great to know! I'll do it then!

Now, I know how to reset BMS with FORScan, but was wondering if any of the methods seen on YT actually work. Apparently, the 5 X rear fog light, then 3 X hazard should do it on a Kuga, but... does it really work?
 

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Super Moderator and Mr Grumpy
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Thanks, great to know! I'll do it then!

Now, I know how to reset BMS with FORScan, but was wondering if any of the methods seen on YT actually work. Apparently, the 5 X rear fog light, then 3 X hazard should do it on a Kuga, but... does it really work?
It works for some people. Try it and see and post back. You can check the days in service using FORScan. At some point I need to go and take some screenshots as I can't remember how to do it from memory but will know as soon as I hook the car up. It's under the oscilloscope tab.
 

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Discussion Starter · #13 ·
It works for some people. Try it and see and post back. You can check the days in service using FORScan. At some point I need to go and take some screenshots as I can't remember how to do it from memory but will know as soon as I hook the car up. It's under the oscilloscope tab.
I'm using OBDLink MX+, as my OBD adapter and FORScan Lite on my Android 11 phone. Works like a charm.

I was just being curious about these "other than OBD port methods"... if these actually work. That's all.

Telephony Mobile phone Communication Device Gadget Mobile device
 

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Thanks, great to know! I'll do it then!

Now, I know how to reset BMS with FORScan, but was wondering if any of the methods seen on YT actually work. Apparently, the 5 X rear fog light, then 3 X hazard should do it on a Kuga, but... does it really work?
Yes it does work but you may need to Google for the age of vehicle as the combination changed at one point (you only have to dance around the mushroom once not twice!) If the battery light flashes you know you have done it.
 

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Discussion Starter · #15 ·
Yes it does work but you may need to Google for the age of vehicle as the combination changed at one point (you only have to dance around the mushroom once not twice!) If the battery light flashes you know you have done it.
Well, I tried both "methods":

  • 5 X rear fog light + 3 X hazard. Nothing happens.
  • 5 times high beam flash 3 X break pedal. Nothing happens.

FORScan did the job nonetheless ;)

P.s.: Mine's 2019 MK2.5, as per my signature.
 
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