Diagnostic Information

As an active OnStar subscriber enrolled in OnStar Vehicle Diagnostics, you receive regular email updates on the condition of five of your vehicle's key operating systems. These reports are automatically generated every 30 days, so you can feel more confident that your car is ready for the road. Click on the links below to learn more about the systems checked each month. Engine and/or Transmission System Emissions System Air Bag System Antilock Brake System OnStar System

This diagnostic data is sent directly to OnStar while you drive, with no effort on your part. Once OnStar receives the information, we send you a simple email report on the status of these vehicle systems. The checkups are scheduled to take place at a predetermined date and time each month. However, if no one drives your vehicle on that date, the call will take place the next time your engine is turned on. See the status alerts below for diagnostic information on each vehicle system.

Status:	Diagnostic:	Action:
	Completed. No problems found.	No action needed.
	Your diagnostic test is incomplete.	We were unable to complete the test on our last call. This may be due to a communications error, or you may have turned the ignition off. The test will be run the next time your vehicle calls in. If the indicator light on your dashboard lights up, or you experience an issue at any time, please push your blue OnStar button and request a GM Goodwrench On Demand Diagnostic.
	Completed. There may be an issue that requires further action.	Please push the blue OnStar button the next time you're in your vehicle to request a GM Goodwrench On Demand Diagnostic. An Advisor will tell you if you need to take further action or if the situation has been resolved.

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