Greetings, all! The model year is 2008. After a normal startup, it enters limp mode and won't reset until rebooted; after that, it starts over. There is absolutely no indication of error codes. This just happened recently; previously, the car would occasionally go into limp mode, but resetting it was as simple as turning off the ignition, waiting 30 seconds, and restarting. After that, it would run smoothly for a few more months.
Many thanks