OnStar Community

I HAD a 2020 GMC Terrain Denali and had the My GMC app for that vehicle, ALL was good, it would let me do EVERYTHING including adding apps allow to adjust Sirius radio settings ,EVERYTHING !! We traded that vehicle in on a 2023 GMC Yukon SLT and we h...

What is the difference between the My GMC app and the Ontar Guardian app ?? And why would you need or want both ??