I bet it was just the harness plug at the dash fuse panel. Mine was doing same thing. They said it was bad receiver for fob signal.
I pulled the wire harnesses on inside fuse box, plugged them back in, and it started working.
Problem: Tahoe displays “Key Fob Programming Mode”, but won’t go into Active Programming Mode when check mark icon is pressed.
The display flashes and goes straight back to same message.
This is the fix, at least for the 2010 Texas Edition Tahoe I was working on yesterday.
Vehicle off, no...
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