A method for updating vehicle diagnostics software via a telematics unit is based on the occurrence of a service event as detected by the telematics unit. Upon the connection of a vehicle diagnostics device to a vehicle, the telematics unit receives a scan tool configuration data and a vehicle code. The determination whether the scan tool configuration is current based on the vehicle code is made at the telematics unit. Based on the determination, the call center sends an updated scan tool configuration data to the telematics unit. The telematics unit offers the updated scan tool configuration data to the vehicle diagnostics device for reprogramming.