My 2020 GMC 2500 HD Denali does the same thing… it works sporadically even under optimal conditions… my sensor gage light will come on and go off for no reason… it’s my understanding that if I press the button the gage indicator should come on, regardless of conditions… the high beams should come on automatically under the right conditions and the blue high beam gage light comes on. However, my sensor gage light fluctuates randomly for no reason and all the button pressing on a dark road will do nothing, then sporadically 5 minutes later the sensor gage indicator pops on by itself and the high beams kick on at the same time. My thought is that there’s a loose wire connected to the button which is why it goes on and off sporadically by itself and occasionally comes on when I press it, and/or it’s a bad sensor somewhere, windshield, bumper, who knows, never took it in to be looked at. Regardless though, if I press the button on the turn signal arm, the auto high beam sensor gage light should come on giving me the indication that the feature is activated and ready to work under optimal conditions, but that’s not the case on my truck, it’s Willy Nilly, press it all you want, some times the indicator comes on most times it doesn’t. It’s like it has a mind of its own, very frustrating. So I generally just manually put the high beams on. Would love a fix for it if one is out there.
