Originally Posted by Cheesy
Do a google for GM secondary latch.

I don’t know if they changed the design by 2013 or not. I’ve seen it fail on a 2003, 2006, and 2007. Fun to find this out in 6@ of snow on Christmas Eve an hour from home. Luckily dad had a dry shop to get his cut out and bring to me as a spare.
I watched a youtube video on this pickup. They showed just turning counterclockwise, no secondary latch.

However, this other video shows one and how to remove it using a screwdriver.




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