I just purchased the XC90 and have replaced most of the cooling system. I am going to replace the ECM if I cannot return it to the dealer. This should be a recall and I sympathize with anyone else experiencing the same issues. It gets expensive.

I have read about this problem and I am having the same problem with my XC90. The problem is a short in the ECM. Apparently you can get it repaired or replace for $1000.00 and up. I will post the link to the site.