I had a strange problem with my Model 3 last weekend. I was going on a short trip and I loaded up the trunk. Then about 20 minutes later I got in the car and headed to the freeway. After 5 or 10 miles I engaged the cruise control, but I got an error that said (something like) "cruise is not available" I tried a few more times -- same error but no other error. Stopped for a snack and the car did not auto lock. I tried the phone app and locking had no effect and no error message. I got back in the car and tried to see what was wrong. Nothing was wrong that I could see. 10 minutes later I came back to the car and I get an error message that the trunk is not locked. It turns out that it was just half-way latched. It there was an error message about it, it was during the time I wasn't in the car. Closed the trunk. Everything works fine again. Silly rule for M3 owners: If your cruise control (or AP) doesn't work it might be the trunk isn't closed. What other conditions might cause a CC or AP failure???
in my experience, AP works best when in the middle lane. the lane closest to the center divider or the other one next to offramps seem to bump AP off when the distance is too far.
Thanks, but that is different than what I'm talking about. The error I got completely disallowed trying to engage the cruise control,