5T4

The first three characters of every VIN are the World Manufacturer Identifier (WMI). The code 5T4 is assigned to Workhorse, with the country of manufacture United States.

So any 17-character VIN that begins with 5T4 was produced by Workhorse:

5T4ZZZ0000000000000

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.