Hi dave, my MY20 V90CC has a bit of a love hate relationship with the stop start - the dealer said the battery wasn't fully charged - I was told that if I charged the whole system ie via the starter battery terminal, that it would help. Can't say it did - sometimes after a long run it will suddenly start working again, but then in what I would describe as cold conditions, it works straight away within a couple of miles when I stop at the first junction. My wife's MY17 XC60 stop start works fine, albeit hers is a manual so I have to select neutral and release the clutch pedal. Maybe a new battery will do it if the dealer will fit one for you under warranty?
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