I had the Xc90 d5 2006 cut out earlier, it re started after a while and also made a strange clicking sound which sounded like it was coming from under the dash drivers side. I'm thinking it's probably the cem, mine shouldn't be the water ingress model but it's always possible. I believe it's when the cem gets hot that causes it, but not really my sort of thing. Any recommendations for a repairer? I did email nick dobrev.
You can always use these clusterrepairsuk.co.uk , they repaired my sister in laws cem out of her 04 xc90 after water damage due to blocked sunroof drains. It comes with 1 years warranty. She has had no problems with it since.
you can try http://volvodiagnostic.com. Central Electrtonic Module Repair V70/XC70 2005-2008 S80 2005-2006 S60 2005-2010 XC90 2005-2014 £ 150.00 http://volvodiagnostic.com/shop/index.php?id_product=13&controller=product&id_lang=1
Thanks guys I removed the cem earlier and it's going to volvo diagnostics.
Best of luck!