fonsech

I ended up troubleshooting a Cadillac back about 6 months ago that had the IO6 (Navigation, etc). In his case, we tried a different HMI, it didn't fix it. I had a spare radio module from my truck, we put it in, he hasn't had a problem since. His was brutally loud! I've got extra components though so we were able to swap (and program) until we found it to be the radio module in his case.

I know this is old but I've had a unit do that a few times (usually my fault lol). I'm sure you've replaced it by now but if you get the USB media to reload it, sometimes it'll come back to life. It would still need to be calibrated by SPS.

I thought I'd respond to this post. I recently purchased a 2015 GMC Sierra Denali HD (love the truck) but it had the HMI 2.0. I had followed some of these posts and I saw Coastal Flash was quite involved in the forums which is great. I went to their website and filled out the contact information form but as I host my own email servers (and apparently my spam filter is too tight) they were blocked. They found another way to contact me and invested easily over an hour on the phone discussing everything about it. At that point, I went with their services and I now have Apple CarPlay, the blue theme, faster response (much better than the 2.0 was I've found) and retained my factory navigation. I'm very happy with the work they've done and I have full confidence in their services. So if anyone is looking to do this upgrade, I would definitely consider them.