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Discussion Starter · #1 ·
I have a 2020 sierra 3500AT4. I am having an issue with the marker lights in the passenger mirror. They flash with the key fob lock/unlock, and with the blinker/hazzard but do not turn on with the running lights. The driver side does. I only see one fuse under the hood (42) for that light which is not blown. Is there anything else for me to check? I'm wondering if the led board is bad in the mirror... (there is a crack on the lense of the light that could let water in...). I am kind of surprised the other light functions work if that was the case though.

Any ideas to troubleshoot or resolve are greatly appreciated.
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