Hi,
Each low-beam bulb has its own fuse. Make sure they are good. Both are located in the under-hood fuse box.
If you find the fuses are good, I suspect the HDM module/relay is bad.
If you look below, I attached two pics. One is the headlamp wiring schematic and the other shows the fuse locations and relay.
Check these and let me know what you find.
I just found a recall related to this issue. If this has never been repaired by GM, they may still cover it. I attached the recall information below. (Pics 3 and 4)
Take care,
Joe
See pics below.
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Wednesday, July 19th, 2023 AT 9:41 PM