From VDE-AR-E 2802-100-1:2019-12 (en), a provisioning certificate ID (PCID), which is contained in the OEM provisioning certificate, is represented by:
<PCID> = <WMI> <OEM's own unique ID> <check digit>
<WMI> = 3 (ALPHA/DIGIT)
Three alphanumeric characters for the World Manufacturer Identifier (WMI) code, as per ISO 3780:2009.
<OEM's own unique ID> = 14 (ALPHA/DIGIT)
OEM's own unique ID for clearly identifying a single vehicle made by the manufacturer.
<check digit> = 1 (ALPHA/DIGIT)
Check digit for checking integrity. The algorithm specified in DIN SPEC 91286:2011-11 shall be used for this.
ALPHA = %x41-5A
Capital letters as per IETF RFC 5234 (7-bit ASCII).
DIGIT = %x30-39
Digits as per IETF RFC 5234 (7-bit ASCII).