OnStar

Diagnostics

~1min read

OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System. If a diagnostics check is needed between e-mails, push OnStar Additional Information, and an Advisor can run a check.

Test yourself

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