Had the same problem. After disconnected the main wiring harness behind the dash (reset I think) everything works. However, now whenever i connect my phone through bluetooth the sd card removed error pops up then goes away within 30 seconds.
I also have a stock 2019 Denail 6.2 with Ultimate. If the DFM is coming on I surely can't tell. Feels smooth like butter all the time in all conditions. If the DFM is what is getting me 21.5 MPG on the highway then I'm a happy camper.
Update: Everything works now. Truck sat overnight and check engine light is off and nav continues to work. I'm thinking the reset of the power to the system did it when I unplugged the harness.
2019 Sierra Denali Ultimate. 900 miles. Truck is great. Love it. However after 2 days the Nav started acting up and now doesn't work at all. I get an error saying the SD card has been removed. SD Card is perfectly fine and in place. I've tried reseating, rebooting multiple times... nothing... I've also noticed the USB plug in the center console right next to the SD card slot does not charge anything. I'm suspecting a loose connection or bad wiring harness. I've checked the connectors directly behind the card slot and reseated them but no dice. Where does the other end go? Behind the glove box? Not trying to tear everything apart but it is annoying. Anybody got a fix? Really don't want to take it to the dealer and wait around while they figure it out if I don't have to. On a positive note as a result of this bug I've discovered Android Auto and love it. Almost better than the infotainment system itself!
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