The paper deals with the use of VIN decoder in the pan-European application eCALL (emergency CALL), which provides information about a crashed vehicle in the territory of EU member states online to the nearest PSAP (Public Safety Answering Point) of the Integrated Rescue System. The basic ICT architecture of the solution used in the Czech Republic is described. The crashed vehicle automatically transmits the coordinates of its position, the globally unique VIN (Vehicle Identification Number), the direction of travel on the road, the vehicle category, the number of seat belts fastened in the vehicle (ie the number of people in vehicle) and the system activation flag (automatically or manually). One of the key roles is played by the so-called VIN decoder, which can decode basic information about the vehicle from the VIN structure and provide it to the nearest operational center of the Integrated Rescue System. At the same time, the VIN decoder can analyze the error rate of the VIN item in various information systems, such as the road vehicle register. The authors describe an analytical study, the aim of which was to determine the percentage error rate of VIN in critical infrastructure information systems. An inspection of various information systems revealed that the error rate reached a relatively high value of 8-10%. The authors describe a way to increase the quality of data in critical infrastructure information systems.