Provided is a remote vehicle diagnostic system which utilizes a smart phone as a centralized communication hub between a vehicle and several remote resources. The system includes a program downloadable onto the smart phone to program the phone to perform desired functionality. The smart phone app may allow the smart phone to operate in a diagnostic mode and an emergency mode. In the diagnostic mode, the smart phone may relay vehicle data from the vehicle to a remote diagnostic center. The smart phone may also query the user to obtain symptomatic diagnostic information, which may be uploaded to the remote diagnostic center. In the emergency mode, the smart phone may be configured to upload critical information to a remote diagnostic center, or an emergency response center. The emergency mode may be triggered automatically in response to the vehicle being in an accident, or by user actuation.