This document defines standardized diagnostic trouble codes (DTCs) for passenger vehicles. It provides specifications for DTC formats and groupings for things like powertrain, body, and chassis systems. The document aims to standardize DTCs reported by on-board diagnostic systems to help with malfunction detection and repair. It includes both ISO/SAE controlled codes and manufacturer-specific codes. SAE reviews and updates the document every five years to include new standardized fault codes and failure types.