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Update on my 2023 Bighorn 2500. The dealer replaced the steering control module. It's been over a week now with no recurrence. Everything is working great now.
I took mine to the dealer yesterday. Of course it was working perfectly, but I showed them my video and they scratched their heads and ordered a steering control module. Says it will be about a week. We'll see what happens.
BTW, mine is still malfunctioning sporadically.
New 2023 2500 Big Horn 6.7 Cummims, 400 miles. Just noticed it today. My HB come on when the left turn signal is activated. And it doesn't matter if the lights are on/off/auto or whether the engine is running or not.
Time to go see the dealer.