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When outside the truck or trailer, select functionality of the in-vehicle trailering app is conveniently available in the phone companion app1, available with the myGMC mobile app on compatible Androidâ„¢ and Apple® smartphones. The functions include:

  • Step-by-step predeparture checklists
  • Trailer Light Sequence Test, which includes an automatic lighting sequence to visually test all lights on the trailer

1. Service availability, features and functionality are subject to limitations and vary by vehicle. In-Vehicle app functionality and features vary with vehicle equipment and trim level, and the connected vehicle services plan you are enrolled in.  myGMC Mobile app available on select Apple® and Android devices. Device data connection required. See onstar.com for details and limitations.