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Discussion Starter · #1 ·
I discovered last night that the manual shift buttons on my new-to-me 2015 GMC Terrain SLE do not work.

When switching to M (and stopped) it goes to d1. If I'm driving it will go to another gear (D2, etc) but not move up or down.

I suspect (as others mentioned) a bad toggle switch.

Does anyone have a walkthrough on how to access/replace the switch?

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