Grayson Pippin

More than just you and another having this issue. I have the same 2020 AT4. The automatic lights worked intermittently since I bought it. Like you said, when the system is on it works, but the system turns off I have no way to get it back on. The switch does nothing. Didn't happen much at first but they have been off for months now. I've never reported it to the dealership. Going in for an oil change next week. I was hoping they would have an update to fix it but judging from this thread, that's not likely. Maybe I'll trad e it in for one of those new Denali Ultimates. Just got to find $100k I'm not using!

Just joining the GM HD club and I'm very interested in finding a Tune. I got a 2500 AT4 and I'm wondering if i can make a material improvement to MPG (2-3 would be nice). I'm not worried about the towing side too much as stock has more than enough power for me. I wanted to see if you purchased the Banks Derringer and if so what benefits are you getting? Also, does the Banks tune void the warranty? I'm not looking for a full delete at all. Only looking to see if I can squeeze a few more MPGs. Thanks for any help!

To follow up on this, the instructions said to tie into one side and run the wire to the other headlight. This was causing the drls not to work on the far side. I ended up tying into the key on power on both sides and that solved my problem. Hope that helps

I have the same problem on my 2015 silverado. Right side works great. Left side drl not coming on. Lights work fine at night, but the drl only works on the right side. Has anyone found a solution to this problem?