When I first saw this, I was a little taken aback:

I get the impression that bad grounds seem to be a common cause for mystery / intermittent electrical problems in these cars -- is it usually corrosion at the ground (branch) terminal, or are the terminals not making good contact through paint / primer / etc? Really appreciate the discussion so far.

Thanks for the replies -- good to hear that some have confidence in the wiring... Will hook up the VIDA/DICE and see what I find out.

I know I'm relatively new to this forum, but have been a car guy for years, worked on all kinds of stuff, done engine conversions and custom wiring harnesses, etc... This 07 V70 2.5T (120k) is our second Volvo after we had a wonderful 850 5MT that got totaled when someone ran a red light a few years ...

Did this ever get resolved? I'm having the exact same problem with 07 V70. Just got Dice/VIDA setup and unable to communicate with those modules. What seems peculiar is that the CEM isn't showing any codes for not being able to communicate with the other modules? Is everything to the right of the ...