Connected Services

Diagnostics

~1min read

By monitoring and reporting on key vehicle systems, OnStar Advanced Diagnostics, if equipped, helps you stay ahead of maintenance. Capabilities depend on the model. See www.onstar.com for details and system limitations. Features may change. For updates on feature capabilities, see my.gmc.com. Messaging and data rates may apply.

Test yourself

A quick GMC Terrain quiz: every answer comes with an explanation and a link to the manual page.