Forum Discussion
MyGMC Trailer Light Test
My GMC trailer light test functionality appears to have been removed or lost in the most recent update of the app - March 2025. I use this feature frequently. I called OnStar support today 3/9/2025 a...
Just found this same issue yesterday. The trailering features, especially the light test, might’ve been my favorite app feat.
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Why is it missing from the app?