2020 Cadillac CT6 - Infotainment issue

Navigation SD Card message. No SD card error. NAV sd card is not functioning properly. What is the problem? The card or the reader?

One word ( Warranty ) .

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Is the SD card in the slot? I have seen used cars with missing SD cards.

Is the SD card Lock/Unlock switch moved fully towards the card contacts, in the upward (Unlocked) position?
Important: DO NOT remove the SD card with the ignition ON. This can corrupt the SD Card and cause navigation related errors.
Important: ONLY remove the card with the key OFF and the driver’s door open.

Just curious, understand why key should be OFF , but why does the door have to be open?

To be honest I am not quite sure about why the door needs to be open. I got this info from the dealer TSB so I posted it figuring it might help OP.

Retained accessory power; the radio stays on for ten minutes after the ignition is switched off. Opening the door shuts off the radio.

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Technology sometimes ties us into knots. Reminds me of that movie Brazil. This could be a good topic for a stand-up comedian.

Years ago, first widely-sold home computers had floppy discs. Story about customer talking to service dept on phone.

Customer: I’m having problem with my floppy disc
Service dept: What’s the problem?
Customer: screen says “not ready” when I try to save my file
Service: Close the door first, then try it again.
Service: (hears a bang sound)
Customer: Ok ,tried it again, still doesn’t work.
Service: What was that bang sound?
Customer: That was me closing the door.
Service: Do you mean the door to the room? …
Customer: Yes

lol …