[BABHUMV]

I had new tires installed, and who knows what wheel got put back where. I took it out the next day and when I engaged the 4 low, I got the SERV TPM message. After I came out of Low, I got the message again for a little while, The light has not since come on. This leads me to believe that your theory of the system re-learning is correct. Thanks so much for your post though, I now know what to do when I rotate the tires. They are right, this forum is great!