DETROIT – General Motors Corp. hopes a new feature offered by its OnStar Div. will retain more subscribers for the in-vehicle telematics provider and lower vehicle-warranty costs, company executives say. The service, called OnStar Vehicle Diagnostics, automatically performs hundreds of problem-solving checks on a vehicle and sends an e-mail maintenance report to the owner. Offered at no additional cost to subscribers, it can be activated on any ’04 model or newer OnStar-equipped GM ...

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