Originally Posted by
Often1
Don't use a code when it is not within scope as that may void not only insurance taken through the contract but third-party as well (as you have certified -- falsely -- that you are entitled to the rate. Not an issue until and unless someone gets hurt or the vehicle is damaged.
People here - including myself - have said over and over that incorrectly using a code voids your insurance, but I have never seen proof that it actually does. I don't think any insurance company cares what you paid for a rental car.