I have a 2021 Cheverolet Silverado 1500 RST with the 5.3. My horn stopped working and I checked the fuse and relay and both are good. I was told to do a hard reset on the infotainment system by holding down the end call button. Tried that and nothing happened except for putting the radio on mute. I do hear the relay clicking so power is there just not getting to the horn.

 

Have you checked to make sure the wiring connector to the horn is plugged in and that the wires are intact?

 

that's weird, there's another Post on here where someone said that their horn stopped working. I wonder what's going on with that? I have a 21 Chevy Silverado 5.3 1500 W/T. My horn still works as far as I know. I've only used it like twice.. LOL