5KK

The first three characters of every VIN are the World Manufacturer Identifier (WMI). The code 5KK is assigned to Western Star Trucks, with the country of manufacture United States.

So any 17-character VIN that begins with 5KK was produced by Western Star Trucks:

5KKZZZ0000000000000

The WMI only identifies the maker. To read the year, engine, plant and serial number, decode the complete 17-digit VIN with our free tool — then check which ECU it uses and what tuning services (DPF, EGR, AdBlue, DTC off, Stage) are available.