600 mile trip coming up? If I were you, I would take the adventure and do it. But I would at least do this. Look up where the MCU power down fuse is. I think its F51 on your car, in the long narrow fuse box under the hood. I'd check if akikiki is right first. Then pull it at home and test that it works. Practice so you can do it in the hot sun, some where stuck in a parking lot like a Supercharger stall. Just in case. Find a spare too. 20 amp, I believe. This is the simplest way to shutdown your MCU if it gets stuck. Cost ya nuthin' to know how and where to do it before you need it, or don't need it - if you are a little prepared. You know how it goes.
Good luck on the trip.