I think my HD radio stopped working several months ago as well (2011 LR4). I just figured something went wrong with the radio or antenna, but wonder if there's something else if several others have suddenly experienced the same thing - has HD radio changed in some way, and our outdated radios can no longer recognize the signal? I had asked the dealer to check it out a few months ago, but they gave me a song and dance about it taking possibly hours of checking wires, etc, and would cost a few hundred just to diagnose the issue. I passed on that offer. All in all, the radio on the 2011 model is downright pitiful - I have never found a way to even scroll through Sirius channels - it only lets you scroll by 'category'. Thankfully I figured out how to connect my iphone via bluetooth to a device hooked up to the USB port in the armrest, so I can stream music through that. But I haven't touched the Nav since the day I picked it up 8 years ago, when I realized it was entirely useless back then. Main regret after all these years is that I should have waited for the 2012, which had an updated radio... (even if that was still terrible by 2012 standards, it was way better than the 2011 version, based on loaners I had driven at the time). I also have roof racks, but they've been on the truck since delivered.