The jamming of a radio frequency (RF) transmission after the vehicle is parked is detected. When the jamming is detected, an emergency message is broadcast on a first random access channel (RACH) associated with the vehicle according to a last known broadcast channel (BCH). When the jamming is detected, at least one last known neighbor serving cell from a stored data structure is determined, and the emergency message is broadcast on one or more second RACHs associated with each of the at least one last known neighbor serving cells.