GM Vehicles Diagnose Themselves

GM has introduced an interesting, and useful, service for their On-Star equipped vehicles. The vehicles automatically and periodically test themselves for problems, looking at critical systems such as the engine, transmission, anti-lock brakes, electrical, and air bag system. Then a detailed report is emailed to the vehicle owner indicating the results of the diagnostic tests as well as reminders for scheduled maintenance, remaining oil life, and other information. The diagnostics can also be run between regular checks by simply pressing the OnStar button in the vehicle.

This service doesn't cost extra for OnStar subscribers and works for any OnStar equipped GM vehicle delivered after 4/21/2004.