Start stop worked for a short while on my 2016 5.0SC, then stopped working.
I have a single battery.
Everything else is working so I have no reason to believe the battery is faulty.

I asked to have it looked at at an upcoming service and they warned me that there'd be a £200 investigative charge if it was found to be the battery. This mildly worried me so I'm digging a little deeper.

Anything in the IID tool that will help? I expect so, but I don't know the algorithm they use to say "yes" or "no" for stop/start.
. Control voltage is 12.4v with engine off.
. Control voltage is 14.4v with engine on.
. "Estimated cold cranking voltage at current state of charge" is 5.06v
. Estimated state of charge is 81%

Anything else?

Should it just work at 81%?

Thanks,
P L405SC just arrived... still working everything out!

My experience is that it shuts off at around 40% or below of battery charge.

Quote:

My experience is that it shuts off at around 40% or below of battery charge.Hmm... so battery looks good then.

I might have to risk the £200 and get them to look at it properly.  L405SC just arrived... still working everything out!

Is your AC functioning well? I found my start stop didn’t work properly until it was recharged and could get the cabin temps to whatever level was set. Try switching the AC off and see if it starts working.

Yup, AC all good. Tried with and without.

Given that nobody seems to think my battery figures look bad ... I'm thinking a proper 'fault'.

Let's see next week when it's booked in. L405SC just arrived... still working everything out!

So the (non chargeable) diagnosis is ... battery.

I’ll replace it. Could do with a ‘spare’ battery for a shed light! 😂
Had a quick look on here and there’s nothing that says that we cannot do it ourselves. But there’s an implication from the dealer that a reset of the battery controller is required.
One, is that true?
Two, can we do it ourselves (IID tool?)?

P L405SC just arrived... still working everything out!

Before you do that, do you have a battery charger? Our D4's stop start only works when ive charged the car well! So, i put ours on a ctek and when its fully charged voila! Stop Start works again!

My FF will be 5 years old in November, I am delighted that the stop/start no longer works but is it a sign of the batteries getting old. letters not necessarily in the right order

Estimated cold cranking voltage at current state of charge" is 5.06v if that is the case your battery is shot and 5.06 volts will not start anything . In most modern cars such a low cranking voltage will trigger lots of spurious error codes as well . New battery time .

Have you disabled the seat belt warning chime ? stop/start disabled if seatbelt not used.

i disabled my seat belt 'bong' and it did not affect the stop/start so i dont think they are related.. ... - .- -.




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Dixy wrote:

My FF will be 5 years old in November, I am delighted that the stop/start no longer works but is it a sign of the batteries getting old.

If you’re battery is weak the stop start will not work, happened to mine back in February. I fitted a new one, but you do have to reset the BMS (battery monitor system) before stop / start will work again. Most good diagnostic tools will do this, my Autel md806 did so I would have thought the gap tool will too.

Most annoying feature so far......

Turn it on. It annoys me.

Turn it off and I’ve got a big stopstart off symbol on the dash. Quite happy to have it off an not be reminded!!

Hateful feature on all cars. There is nothing that can't be fixed with a hammer😜😜
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Totally agree with you there Mark it is annoying, but it’s a double edged sword for me, when does work it annoys me keep disabling it and when it didn’t work it annoyed me because it should.