I just had my 12V replaced under warranty. It was almost 4yrs old before I received the warning. For those of you waiting to replace your 12V until the last minute, keep in mind that the service center may not have any in stock. I had to wait 2wks for them to get new stock. I even had them check with another service center 200mi away in Stl and supposedly they were out of stock as well. The service center told me I'd be fine to drive for the 2wks, but there was no way I was taking that chance and getting stranded.