I just had an incident that I don't know what to think of. It was clearly different from the others listed here, but part of it is similar.
I had just dropped off stuff at goodwill & was still sitting in their drivethru with the engine off. I was about to leave, thought of something, got back out, spoke to them very briefly, and got back in. I had left my purse, etc, in the van bc I was right there & no one was around. I honestly don't remember if I had actually started my vehicle before getting out (I was more aware of making a decision whether my purse was safe), but I don't think so. If I did, I left it running, but I don't think I started it. (I was parked at the bay door so was right beside my vehicle.) At this point, I was doing things automatically, as we do. My attention was only grabbed later.
I got back in, possibly started it (if I hadn't), then shifted into D. The van wouldn't move, and I received an error message: "Shift to park to choose gear" or very close to that. This is not the exact message others have gotten, but starts the same. I looked at my gear knob... the blue light was clearly illuminated above the "D." It was definitely not in neutral, as I am short & my seat is so far fwd that the light is over the D & ever so slightly right of it (toward Low). It is always like that because of the angle of my view. It is like that as I'm looking at it now with the engine running. I.e., this is how normal "Drive" gear looks to me.
I shifted into park, then back to D. As soon as I shifted, the error code disappeared and I wished I had taken a picture of the error message and the clearly-illuminated D for drive. (!!)
HERE IS THE MAJOR DIFFERENCE: It did not shut off - I was stationary throughout the error & its correction. *I had not attempted to move yet.* For me, it decided I was not in Drive when I was per the indicator, before I ever moved; for others, it decided exactly the same, but after already in motion.
I am guessing I had the same problem, but at a safer time... and perhaps not being in motion then failed to trigger something affected by the "unsensed"
gear.
Once home, I tried without success to see if I could shift into a gear incompletely, triggering such an error message justifiably ...i.e., could I shift to to a physical point where it didn't click all the way into gear. I tried repeatedly, and it was not possible -- if you to try to stop partway between gears (whether off by a little or a lot), the knob "drops" into the nearest gear. I simply could not get "almost" into Drive. It always dropped in, and the error code did not reappear.
So this may be an entirely different type of issue, but the similarities are that 1) it was clearly in gear, 2) it did not sense that it was in gear, and 3) it told me to "Shift to Park" to do something that was clearly already done--for me, choosing a gear; for others, starting the engine. Perhaps this is actually related to a transmission problem.
I don't know if it would have shut down had I been moving, or not. I had not attempted to move yet.
Perhaps this variation might shed light on narrowing down what the problem could be.
I am kicking myself for not getting a photo. I was very busy with much holiday company coming in soon, and didn't think until I saw that "Shift to Park" message and my hands were immediately in motion to respond & did what it said before my mind caught up & realized a pic would be a good idea.
For now, we will operate under the assumption that we may well have one of "those" vans, and avoid highway speeds. If it happens again, I'll try to get a picture.
I am taking the time to write this down immediately, before I forget any other details than whether I had started the engine. I'm hoping some nuance here helps.