Just went through this on my 2017 4T. Unless the hitch receiver can be traced to the warranty claim failure, then your warranty should still be in good standing for everything else. I also found a link to the etrailer website that covers this exact question, but I can't post the link until I post more on this site lol! Hope that helps.
Here's the etrailer link!!! Can Hitch Install on 2016 Toyota Prius without Voiding the Warranty | etrailer.com
Hello and welcome to the forum, Depe. Your model Prius is known as a generation three, (Gen 3) and there is a forum where owners discuss problems/features specific to that model range. You will find it at:-- Gen 3 (2010-2015) Toyota Prius Forums | PriusChat Finally, and this is not a rebuke, if you add your country or state to your profile, but not your address or anything to positively identify you or your home, it will assist others in offering you better advice.
This is great! I have been trying to figure out the best way to do this without having the possibility of scratching my trunk.
sorry for the confusion! I recently picked up a 2017 Prius Four Touring. I will be sure to post some pics sometime.