OnStar Services

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2013 Cadillac ATS drive review
It's a great job, if you like the work. Performance engineer Kevin Zelenka gets paid to drive in what he calls the "nonlinear zone"--a marginal-grip region of time and space where he kee ...

Overheated Engine Protection Operating Mode
If an overheated engine condition exists and the ENGINE POWER IS REDUCED message is displayed, an overheat protection mode which alternates firing groups of cylinders helps prevent engine damage. ...

Exterior Lamps Off Reminder
If a door is open, a reminder chime sounds when the headlamps or parking lamps are manually turned on and the key is out of the ignition. To turn off the chime, turn the headlamp switch to off or ...