fault code 1516? on 2007 Pontiac G6

What does fault code 1516 mean?

Asked by for the 2007 Pontiac G6
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For test procedures, there is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate