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...
Like others, I was extremely frustrated to find the light test feature removed. I also contacted support multiple times and they had no idea what I was referring to. I would cancel my service but it was prepaid thru a $1500 charge in the cost of my truck. Very disappointed in GM/onstar