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The myGMC® mobile app1 lets you control many of Sierra’s features from your mobile device when you have a paid subscription to GMC Remote Access Plan2, including:

  • Access to the phone companion app, which offers select mobile functionality of the available in-vehicle trailering app
  • Remote-start your engine3
  • Check your fuel efficiency, oil life and tire pressure4 (limited trial period included)
  • Send destinations to your vehicle through your smartphone

1.       Available on select Apple and Android devices. Service availability, features and functionality are subject to limitations and vary by vehicle, device and the plan in which you are enrolled. Device data connection required. Visit for more details.
2.       Diagnostic capabilities vary by model and do not cover all vehicle conditions. Additional message and data rates may apply. Requires email address on file and enrollment in Vehicle Diagnostics. Remote Access Plan does not include emergency or security services. Services are subject to user terms and limitations. Visit for more details.
3.       Requires subscription to Remote Access Plan or Premium Access Plan. Services are subject to user terms and limitations, and vary by vehicle model. Unlock feature requires automatic locks. Remote start requires GM factory-installed and enabled remote start system. Visit for more details.
4.       Tire Pressure Monitoring System required (excludes spare).