I just noticed that my tailgate is not locking with my remote control.

I don't remember when I last knew it worked; I don't often pay attention to it.

Where exactly should I start looking to troubleshoot this?

Side note: I'm not sure if it matters, but I replaced my key fob a few months ago, and I'm not sure if a specific fob is linked to a particular module of the tailgate component.

I'm not sure when it stopped working, honestly.

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