A sector add-on over ISO 27001 — adds the VDA ISA 6.0.4 assessment catalogue plus the assurance-level (AL1/2/3) + label-based filtering specific to automotive suppliers.
Mandatory by Volkswagen, BMW, Daimler, Audi, Porsche, and most other German OEM contracts. The TISAX label on the ENX portal is what suppliers actually transact on.