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Same appeared for me this weekend, after experiencing just the HB activation.
Some days left signal activates HBs,some days flash to pass activates the left signal bump, some days it behaves
And I turned auto lamp off. Essentially turning off all headlight “power” to LBs. How I figure, if there’s no power to the low beams, auto lamp or DRL, HBs can’t be activated in daylight. I’ll have to buy some nightvision goggles to drive when the sun goes down
Had to turn off the daytime running lights to avoid flashing people during the day as well. Now that I’m aware of it, stopped at a red light, with left signal on and got a “WTF” from a car in front of me
I bought a 2023 2500 Big Horn 6.7 this week. Drove it at night for the first time tonight and same thing. Signaling for a left turn, HBs come on. Stop with left signal on, complete turn and HBs come on. 300 miles on the truck