You may have nailed it.
Here's the latest...
I found a 125K mile transmission at a local recycler. Price was fair enough that I chose to roll the dice and install it. First time I've removed/replaced a FWD transmission. That's a story in itself as there is not a lot of room under the hood of an early S40.
Fired it up this morning and the EXACT same thing is happening. I just can't believe that both transmissions (my original and the replacement) have the same problem. So that leads me to believe that it's a software issue as you surmised in the first place. Yea, back to the P0600 code.
Also surfed and found a TSB (#197387) but not a lot of details about it. Wish I could find more details about the TSB.
Kind of at a loss at the moment and not ready to "roll" again with the CEM replacement. I wish there was a better way to shade-tree diagnose than just bringing it somewhere. Fortunately we still have a few extra cars to use in the meantime.
Sigh.
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