What features do I need to look for when getting an aftermarket radio and keep factory options? I have a 2012 Colorado with Bluetooth and On-Star.
More info in a similar thread I started a while back.Since you have Onstar, I highly recommend the Metra Axxess GMOS-01. Even though you don't plan on using OnStar, this harness adapter will keep everything running properly and the BCM will not have any issues with it. All of the Scosche and Peripheral brand adapters have been known to fail and/or cause damage to the BCM. The other brands can also prevent you from getting the PCM tuned properly.